postgresql/doc/src/sgml/release-9.5.sgml

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<!-- doc/src/sgml/release-9.5.sgml -->
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<!-- See header comment in release.sgml about typical markup -->
<sect1 id="release-9-5">
<title>Release 9.5</title>
<note>
<title>Release Date</title>
<simpara>2016-??-??</simpara>
<simpara>Current as of 2015-12-15</simpara>
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</note>
<sect2>
<title>Overview</title>
<para>
Major enhancements in <productname>PostgreSQL</> 9.5 include:
</para>
<!-- This list duplicates items below, but without authors or details-->
<itemizedlist>
<listitem>
<para>
Allow <link linkend="sql-on-conflict"><command>INSERT</></>s
that would generate constraint conflicts to be turned into
<command>UPDATE</>s or ignored
</para>
</listitem>
<listitem>
<para>
Add <literal>GROUP BY</> analysis features <link
linkend="queries-grouping-sets"><literal>GROUPING SETS</></>,
<link linkend="queries-grouping-sets"><literal>CUBE</></> and
<link linkend="queries-grouping-sets"><literal>ROLLUP</></>
</para>
</listitem>
<listitem>
<para>
Add row-level security control
</para>
</listitem>
<listitem>
<para>
Allow <link linkend="pg-replication-origin-create">labeling</> of
the origin of logical replication changes, and provide mechanisms
for tracking the progress of replication
</para>
</listitem>
<listitem>
<para>
Add <link linkend="BRIN">Block Range Indexes</> (<acronym>BRIN</>)
</para>
</listitem>
<listitem>
<para>
Substantial performance improvements for sorting
</para>
</listitem>
<listitem>
<para>
Substantial performance improvements for multi-CPU machines
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</para>
</listitem>
</itemizedlist>
<para>
The above items are explained in more detail in the sections below.
</para>
</sect2>
<sect2>
<title>Migration to Version 9.5</title>
<para>
A dump/restore using <xref linkend="app-pg-dumpall">, or use
of <xref linkend="pgupgrade">, is required for those wishing to migrate
data from any previous release.
</para>
<para>
Version 9.5 contains a number of changes that may affect compatibility
with previous releases. Observe the following incompatibilities:
</para>
<itemizedlist>
<listitem>
<!--
2015-03-11 [c6b3c93] Tom Lane: Make operator precedence follow the SQL standar..
-->
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<para>
Adjust <link linkend="sql-precedence">operator precedence</>
to match the <acronym>SQL</> standard (Tom Lane)
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</para>
<para>
The precedence of <literal>&lt;=</literal>, <literal>&gt;=</literal>
and <literal>&lt;&gt;</literal> has been reduced to match that of
<literal>&lt;</literal>, <literal>&gt;</literal>
and <literal>=</literal>. The precedence of <literal>IS</> tests
(e.g., <replaceable>x</> <literal>IS NULL</>) has been reduced to be
just below these six comparison operators.
Also, multi-keyword operators beginning with <literal>NOT</> now have
the precedence of their base operator (for example, <literal>NOT
BETWEEN</> now has the same precedence as <literal>BETWEEN</>) whereas
before they had inconsistent precedence, behaving like <literal>NOT</>
with respect to their left operand but like their base operator with
respect to their right operand. The new configuration
parameter <xref linkend="guc-operator-precedence-warning"> can be
enabled to warn about queries in which these precedence changes result
in different parsing choices.
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</para>
</listitem>
<listitem>
<!--
2015-03-31 [0badb06] Bruce ..: pg_ctl: change default shutdown mode from 'sma..
-->
<para>
Change <application>pg_ctl</>'s default shutdown mode from
<literal>smart</> to <literal>fast</> (Bruce Momjian)
</para>
<para>
This means the default behavior will be to forcibly cancel existing
database sessions, not simply wait for them to exit.
</para>
</listitem>
<listitem>
<!--
2015-03-04 [1345cc6] Tom Lane: Use standard casting mechanism to convert type..
-->
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<para>
Use assignment cast behavior for data type conversions
in <application>PL/pgSQL</> assignments, rather than converting to and
from text (Tom Lane)
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</para>
<para>
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This change causes conversions of Booleans to strings to
produce <literal>true</> or <literal>false</>, not <literal>t</>
or <literal>f</>. Other type conversions may succeed in more cases
than before; for example, assigning a numeric value <literal>3.9</> to
an integer variable will now assign 4 rather than failing. If no
assignment-grade cast is defined for the particular source and
destination types, <application>PL/pgSQL</> will fall back to its old
I/O conversion behavior.
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</para>
</listitem>
<listitem>
<!--
2014-08-28 [11a020e] Andres..: Allow escaping of option values for options pas..
-->
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<para>
Allow characters in <link linkend="libpq-connect-options">server
command-line options</> to be escaped with a backslash (Andres Freund)
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</para>
<para>
Formerly, spaces in the options string always separated options, so
there was no way to include a space in an option value. Including
a backslash in an option value now requires writing <literal>\\</>.
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</para>
</listitem>
<listitem>
<!--
2015-05-08 [9a08841] Stephe..: Change default for include_realm to 1
-->
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<para>
Change the default value of the GSSAPI <link
linkend="gssapi-auth"><varname>include_realm</></> parameter to 1, so
that by default the realm is not removed from a <acronym>GSS</>
or <acronym>SSPI</> principal name (Stephen Frost)
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</para>
</listitem>
<listitem>
<!--
2015-01-22 [59367fd] Bruce ..: adjust ACL owners for REASSIGN and ALTER OWNER..
-->
2015-06-11 06:08:55 +02:00
<para>
Fix <link linkend="SQL-REASSIGN-OWNED"><command>REASSIGN OWNED</></>
and <link linkend="SQL-ALTERTYPE"><command>ALTER OWNER TO</></>
to properly update permissions lists (ACLs) when changing ownership of
types, foreign data wrappers, and foreign servers (Bruce Momjian)
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</para>
</listitem>
<listitem>
<!--
2015-02-23 [88e9823] Heikki..: Replace checkpoint_segments with min_wal_size a..
2015-03-15 [a0f5954] Andres..: Increase max_wal_size's default from 128MB to 1..
2015-06-29 [d661532] Heikki..: Also trigger restartpoints based on max_wal_siz..
-->
<para>
Replace configuration parameter <varname>checkpoint_segments</>
with <xref linkend="guc-min-wal-size">
and <xref linkend="guc-max-wal-size"> (Heikki Linnakangas)
</para>
<para>
If you previously adjusted <varname>checkpoint_segments</varname>, the
following formula will give you an approximately equivalent setting:
<programlisting>
max_wal_size = (3 * checkpoint_segments) * 16MB
</programlisting>
Note that the default setting for <varname>max_wal_size</varname> is
much higher than the default <varname>checkpoint_segments</varname> used
to be, so adjusting it might no longer be necessary.
</para>
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</listitem>
<listitem>
<!--
2015-10-20 [b06f1f2] Robert..: Put back ssl_renegotiation_limit parameter, bu..
2015-07-28 [6087d95] Andres..: Remove ssl renegotiation support.
-->
<para>
Decommission server configuration
parameter <varname>ssl_renegotiation_limit</>, which was deprecated
in earlier releases (Andres Freund)
</para>
<para>
While SSL renegotiation is a good idea in theory, it has caused enough
bugs to be considered a net negative in practice, and it is due to be
removed from future versions of the relevant standards. We have
therefore removed support for it from <productname>PostgreSQL</>.
The <varname>ssl_renegotiation_limit</> parameter still exists, but
cannot be set to anything but zero (disabled). It's not documented
anymore, either.
</para>
</listitem>
<listitem>
<!--
2014-11-05 [525a489] Tom Lane: Remove the last vestige of server-side autocomm..
-->
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<para>
Remove server configuration parameter <varname>autocommit</>, which
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was already deprecated and non-operational (Tom Lane)
</para>
</listitem>
<listitem>
<!--
2015-03-06 [bb8582a] Peter ..: Remove rolcatupdate
-->
2015-06-11 06:08:55 +02:00
<para>
Remove the <link linkend="catalog-pg-authid"><structname>pg_authid</></>
catalog's <structfield>rolcatupdate</> field, as it had no usefulness
(Adam Brightwell)
</para>
</listitem>
<listitem>
<!--
2015-12-13 [28c3667] Magnus..: Consistently set all fields in pg_stat_replica..
-->
<para>
The <link
linkend="monitoring-stats-views-table"><structname>pg_stat_replication</></link>
system view's <structfield>sent</> field is now NULL, not zero, when
it has no valid value (Magnus Hagander)
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</para>
</listitem>
<listitem>
<!--
2015-07-17 [89ddd29] Andrew..: Support JSON negative array subscripts everywh..
-->
<para>
Allow <type>json</> and <type>jsonb</> array extraction operators to
accept negative subscripts, which count from the end of JSON arrays
(Peter Geoghegan, Andrew Dunstan)
</para>
<para>
Previously, these operators returned <literal>NULL</> for negative
subscripts.
</para>
</listitem>
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</itemizedlist>
</sect2>
<sect2>
<title>Changes</title>
<para>
Below you will find a detailed account of the changes between
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<productname>PostgreSQL</productname> 9.5 and the previous major
release.
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</para>
<sect3>
<title>Server</title>
<sect4>
<title>Indexes</title>
<itemizedlist>
<listitem>
<!--
2014-11-07 [7516f52] Alvaro..: BRIN: Block Range Indexes
2015-05-05 [3b6db1f] Alvaro..: Add geometry/range functions to support BRIN in..
2015-05-15 [b0b7be6] Alvaro..: Add BRIN infrastructure for "inclusion" opclasses
-->
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<para>
Add <link linkend="BRIN">Block Range Indexes</> (<acronym>BRIN</>)
(&Aacute;lvaro Herrera)
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</para>
<para>
<acronym>BRIN</> indexes store only summary data (such as minimum
and maximum values) for ranges of heap blocks. They are therefore
very compact and cheap to update; but if the data is naturally
clustered, they can still provide substantial speedup of searches.
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</para>
</listitem>
<listitem>
<!--
2015-05-15 [35fcb1b] Heikki..: Allow GiST distance function to return merely ..
-->
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<para>
Allow queries to perform accurate distance filtering of
bounding-box-indexed objects (polygons, circles) using <link
linkend="GiST">GiST</> indexes (Alexander Korotkov, Heikki
Linnakangas)
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</para>
<para>
Previously, to exploit such an index a subquery had to be used to
select a large number of rows ordered by bounding-box distance, and
the result then had to be filtered further with a more accurate
distance calculation.
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</para>
</listitem>
<listitem>
<!--
2015-03-26 [d04c8ed] Heikki..: Add support for index-only scans in GiST.
2015-03-27 [e09b483] Heikki..: Add index-only scan support to btree_gist.
2015-03-28 [3a20b0e] Heikki..: Add index-only scan support to inet GiST opclass.
2015-03-30 [0633a60] Heikki..: Add index-only scan support to range type GiST ..
-->
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<para>
Allow <link linkend="GiST">GiST</> indexes to perform index-only
scans (Anastasia Lubennikova, Heikki Linnakangas, Andreas Karlsson)
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</para>
</listitem>
<listitem>
<!--
Add GUC and storage parameter to set the maximum size of GIN pending list.
-->
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<para>
Add configuration parameter <xref linkend="guc-gin-pending-list-limit">
to control the size of <acronym>GIN</> pending lists (Fujii Masao)
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</para>
<para>
This value can also be set on a per-index basis as an index storage
parameter. Previously the pending-list size was controlled
by <xref linkend="guc-work-mem">, which was awkward because
appropriate values for <varname>work_mem</> are often much too large
for this purpose.
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</para>
</listitem>
<listitem>
<!--
2014-09-10 [84aa8ba] Bruce ..: Issue a warning during the creation of hash in..
-->
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<para>
Issue a warning during the creation of <link
linkend="indexes-types">hash</> indexes because they are not
crash-safe (Bruce Momjian)
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</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>General Performance</title>
<itemizedlist>
<listitem>
<!--
2015-01-19 [4ea51cd] Robert..: Use abbreviated keys for faster sorting of text..
2014-09-19 [e246b3d] Robert..: Add a fast pre-check for equality of equal-leng..
2015-05-13 [78efd5c] Robert..: Extend abbreviated key infrastructure to datum ..
-->
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<para>
Improve the speed of sorting of <type>varchar</>, <type>text</>,
and <type>numeric</> fields via <quote>abbreviated</> keys
(Peter Geoghegan, Andrew Gierth, Robert Haas)
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</para>
</listitem>
<listitem>
<!--
2014-11-07 [5ea86e6] Robert..: Use the sortsupport infrastructure in more cas..
-->
<para>
Extend the infrastructure that allows sorting to be performed by
inlined, non-<acronym>SQL</acronym>-callable comparison functions to
cover <command>CREATE INDEX</>, <command>REINDEX</>, and
<command>CLUSTER</> (Peter Geoghegan)
</para>
</listitem>
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<listitem>
<!--
2014-09-10 [45f6240] Heikki..: Pack tuples in a hash join batch densely, to sa..
2014-09-12 [8cce08f] Robert..: Change NTUP_PER_BUCKET to 1 to improve hash joi..
2014-10-13 [30d7ae3] Kevin ..: Increase number of hash join buckets for undere..
-->
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<para>
Improve performance of hash joins (Tomas Vondra, Robert Haas)
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</para>
</listitem>
<listitem>
<!--
2014-09-25 [5d7962c] Robert..: Change locking regimen around buffer replacement.
2014-12-25 [d72731a] Andres..: Lockless StrategyGetBuffer clock sweep hot path.
-->
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<para>
Improve concurrency of shared buffer replacement
(Robert Haas, Amit Kapila, Andres Freund)
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</para>
</listitem>
<listitem>
<!--
2015-03-25 [2ed5b87f] Kevin ..: Reduce pinning and buffer content locking for b..
-->
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<para>
Reduce the number of page locks and pins during index scans (Kevin Grittner)
</para>
<para>
The primary benefit of this is to allow index vacuums to be blocked
less often.
</para>
</listitem>
<listitem>
<!--
2014-08-30 [4b4b680] Andres..: Make backend local tracking of buffer pins memo..
2015-01-19 [2d115e4] Andres..: Fix various shortcomings of the new PrivateRefC..
-->
<para>
Make per-backend tracking of buffer pins more memory-efficient
(Andres Freund)
</para>
</listitem>
<listitem>
<!--
2014-12-25 [ab5194e] Andres..: Improve LWLock scalability.
-->
<para>
Improve lock scalability (Andres Freund)
</para>
<para>
This particularly addresses scalability problems when running on
systems with multiple <acronym>CPU</> sockets.
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</para>
</listitem>
<listitem>
<!--
2014-07-15 [f15821e] Tom Lane: Allow join removal in some cases involving a le..
-->
<para>
Allow the optimizer to remove unnecessary references to left-joined
subqueries (David Rowley)
</para>
</listitem>
<listitem>
<!--
2014-06-27 [d222585] Tom Lane: Allow pushdown of WHERE quals into subqueries w..
-->
<para>
Allow pushdown of query restrictions into subqueries with <link
linkend="functions-window">window functions</>, where appropriate
(David Rowley)
</para>
</listitem>
<listitem>
<!--
2015-04-27 [dcbf594] Stephe..: Improve qual pushdown for RLS and SB views
-->
<para>
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Allow non-leakproof functions to be passed into security barrier
views if the function does not reference any table columns
(Dean Rasheed)
</para>
</listitem>
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<listitem>
<!--
2015-09-24 [45d256c] Tom Lane: Allow planner to use expression-index stats fo..
-->
<para>
Teach the planner to use statistics obtained from an expression
index on a boolean-returning function, when a matching function call
appears in <literal>WHERE</> (Tom Lane)
</para>
</listitem>
<listitem>
<!--
2015-09-23 [cfb2024] Tom Lane: Make ANALYZE compute basic statistics even for..
-->
<para>
Make <command>ANALYZE</> compute basic statistics (null fraction and
average column width) even for columns whose data type lacks an
equality function (Oleksandr Shulgin)
</para>
</listitem>
<listitem>
<!--
2014-11-04 [5028f22] Heikki..: Switch to CRC-32C in WAL and other places.
2015-02-10 [025c024] Heikki..: Speed up CRC calculation using slicing-by-8 alg..
2015-04-14 [3dc2d62] Heikki..: Use Intel SSE 4.2 CRC instructions where availa..
-->
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<para>
Speed up <acronym>CRC</> (cyclic redundancy check) computations
and switch to CRC-32C (Abhijit Menon-Sen, Heikki Linnakangas)
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</para>
</listitem>
<listitem>
<!--
2015-01-16 [f5ae3ba] Andres..: Make tbm_add_tuples more efficient by caching t..
2015-01-16 [779fdcd] Tom Lane: Improve new caching logic in tbm_add_tuples().
-->
<para>
Improve bitmap index scan performance (Teodor Sigaev, Tom Lane)
</para>
</listitem>
<listitem>
<!--
2014-07-01 [9f03ca9] Robert..: Avoid copying index tuples when building an ind..
-->
<para>
Speed up <command>CREATE INDEX</> by avoiding unnecessary memory
copies (Robert Haas)
</para>
</listitem>
<listitem>
<!--
2014-10-02 [3acc10c9] Robert..: Increase the number of buffer mapping partitio..
-->
<para>
Increase the number of buffer mapping partitions (Amit Kapila,
Andres Freund, Robert Haas)
</para>
<para>
This improves performance for highly concurrent workloads.
</para>
</listitem>
</itemizedlist>
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</sect4>
<sect4>
<title>Monitoring</title>
<itemizedlist>
<listitem>
<!--
2015-04-03 [4ff695b1] Alvaro..: Add log_min_autovacuum_duration per-table option
-->
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<para>
Add per-table autovacuum logging control via new
<varname>log_min_autovacuum_duration</> storage parameter
(Michael Paquier)
</para>
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</listitem>
<listitem>
<!--
2014-06-29 [51adcaa] Andres..: Add cluster_name GUC which is included in proce..
-->
2015-06-11 06:08:55 +02:00
<para>
Add new configuration parameter <xref linkend="guc-cluster-name">
(Thomas Munro)
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</para>
<para>
This string, typically set in <link
linkend="config-setting-configuration-file"><filename>postgresql.conf</></>,
allows clients to identify the cluster. This name also appears
in the process title of all server processes, allowing for easier
identification of processes belonging to the same cluster.
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</para>
</listitem>
<listitem>
<!--
2014-09-13 [fe550b2] Tom Lane: Invent PGC_SU_BACKEND and mark log_connections..
-->
2015-06-11 06:08:55 +02:00
<para>
Prevent non-superusers from changing <xref
linkend="guc-log-disconnections"> on connection startup (Fujii Masao)
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</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title><acronym>SSL</></title>
<itemizedlist>
<listitem>
<!--
2014-09-12 [acd08d7] Heikki..: Support Subject Alternative Names in SSL server..
-->
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<para>
Check <link linkend="libpq-ssl"><quote>Subject Alternative
Names</></> in <acronym>SSL</> server certificates, if present
(Alexey Klyukin)
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</para>
<para>
When they are present, this replaces checks against the certificate's
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<quote>Common Name</>.
</para>
</listitem>
<listitem>
<!--
2015-04-12 [9029f4b] Magnus..: Add system view pg_stat_ssl
-->
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<para>
Add system view <link
linkend="pg-stat-ssl-view"><structname>pg_stat_ssl</></> to report
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<acronym>SSL</> connection information (Magnus Hagander)
</para>
</listitem>
<listitem>
<!--
2015-02-03 [91fa7b4] Heikki..: Add API functions to libpq to interrogate SSL ..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <application>libpq</> functions to return <acronym>SSL</>
information in an implementation-independent way (Heikki Linnakangas)
</para>
<para>
While <link linkend="libpq-pqgetssl"><function>PQgetssl()</></> can
still be used to call <productname>OpenSSL</> functions, it is now
considered deprecated because future versions
of <application>libpq</> might support other <acronym>SSL</>
implementations. When possible, use the new
functions <link
linkend="libpq-pqsslattribute"><function>PQsslAttribute()</></>, <link
linkend="libpq-pqsslattributenames"><function>PQsslAttributeNames()</></>,
and <link linkend="libpq-pqsslinuse"><function>PQsslInUse()</></>
to obtain <acronym>SSL</> information in
an <acronym>SSL</>-implementation-independent way.
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</para>
</listitem>
<listitem>
<!--
2015-04-09 [8a0d34e4] Peter ..: libpq: Don't overwrite existing OpenSSL thread..
-->
2015-06-11 06:08:55 +02:00
<para>
Make <application>libpq</> honor any <productname>OpenSSL</>
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thread callbacks (Jan Urbanski)
</para>
<para>
Previously they were overwritten.
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Server Settings</title>
<itemizedlist>
<listitem>
<!--
2015-02-23 [88e9823] Heikki..: Replace checkpoint_segments with min_wal_size a..
2015-03-15 [a0f5954] Andres..: Increase max_wal_size's default from 128MB to 1..
2015-06-29 [d661532] Heikki..: Also trigger restartpoints based on max_wal_siz..
-->
2015-06-11 06:08:55 +02:00
<para>
Replace configuration parameter <varname>checkpoint_segments</>
with <xref linkend="guc-min-wal-size">
and <xref linkend="guc-max-wal-size"> (Heikki Linnakangas)
2015-06-11 06:08:55 +02:00
</para>
<para>
This change allows the allocation of a large number of <acronym>WAL</>
files without keeping them after they are no longer needed.
Therefore the default for <varname>max_wal_size</> has been set
to <literal>1GB</>, much larger than the old default
for <varname>checkpoint_segments</>.
Also note that standby servers perform restartpoints to try to limit
their WAL space consumption to <varname>max_wal_size</>; previously
they did not pay any attention to <varname>checkpoint_segments</>.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-12-03 [73c986a] Alvaro..: Keep track of transaction commit timestamps
-->
2015-06-11 06:08:55 +02:00
<para>
Allow recording of transaction
2015-09-11 03:22:21 +02:00
commit time stamps when configuration parameter <xref
linkend="guc-track-commit-timestamp">
is enabled (&Aacute;lvaro Herrera, Petr Jel&iacute;nek)
2015-06-11 06:08:55 +02:00
</para>
<para>
2015-09-11 03:22:21 +02:00
Time stamp information can be accessed using functions <link
linkend="functions-commit-timestamp"><function>pg_xact_commit_timestamp()</></>
and <function>pg_last_committed_xact()</>.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-12-22 [584e35d] Peter ..: Change local_preload_libraries to PGC_USERSET
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <xref linkend="guc-local-preload-libraries"> to be set
by <command>ALTER ROLE SET</> (Peter Eisentraut, Kyotaro Horiguchi)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-04-03 [a75fb9b] Alvaro..: Have autovacuum workers listen to SIGHUP, too
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link linkend="autovacuum">autovacuum workers</>
to respond to configuration parameter changes during a run
(Michael Paquier)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-06-20 [3bdcf6a] Andres..: Don't allow to disable backend assertions via t..
-->
2015-06-11 06:08:55 +02:00
<para>
Make configuration parameter <xref linkend="guc-debug-assertions">
read-only (Andres Freund)
2015-06-11 06:08:55 +02:00
</para>
<para>
This means that assertions can no longer be turned
off if they were enabled at compile time, allowing for more
efficient code optimization. This change also removes the <link
linkend="app-postgres-options">postgres</> <option>-A</> option.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-10-18 [7feaccc] Peter ..: Allow setting effective_io_concurrency even on..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow setting <xref linkend="guc-effective-io-concurrency"> on
systems where it has no effect (Peter Eisentraut)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-06-18 [df8b7bc] Tom Lane: Improve our mechanism for controlling the Linux..
-->
2015-06-11 06:08:55 +02:00
<para>
Add environment variables <link
linkend="linux-memory-overcommit"><envar>PG_OOM_ADJUST_FILE</></>
and <link
linkend="linux-memory-overcommit"><envar>PG_OOM_ADJUST_VALUE</></>
to help control the Linux <acronym>OOM</> killer (Gurjeet Singh)
2015-06-11 06:08:55 +02:00
</para>
<para>
The previous <acronym>OOM</> control infrastructure involved a
compile-time option.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-05-08 [a97e0c3] Stephe..: Add pg_file_settings view and function
2015-06-28 [62d16c7] Tom Lane: Improve design and implementation of pg_file_se..
-->
2015-06-11 06:08:55 +02:00
<para>
Improve design and implementation of pg_file_settings view. As first committed, this view reported on the file contents as they were at the last SIGHUP event. That's not as useful as reporting on the current contents, and what's more, it didn't work right on Windows unless the current session had serviced at least one SIGHUP. Therefore, arrange to re-read the files when pg_show_all_settings() is called. This requires only minor refactoring so that we can pass changeVal = false to set_config_option() so that it won't actually apply any changes locally. In addition, add error reporting so that errors that would prevent the configuration files from being loaded, or would prevent individual settings from being applied, are visible directly in the view. This makes the view usable for pre-testing whether edits made in the config files will have the desired effect, before one actually issues a SIGHUP. I also added an "applied" column so that it's easy to identify entries that are superseded by later entries; this was the main use-case for the original design, but it seemed unnecessarily hard to use for that. Also fix a 9.4.1 regression that allowed multiple entries for a PGC_POSTMASTER variable to cause bogus complaints in the postmaster log. (The issue here was that commit bf007a27acd7b2fb unintentionally reverted 3e3f65973a3c94a6, which suppressed any duplicate entries within ParseConfigFp. However, since the original coding of the pg_file_settings view depended on such suppression *not* happening, we couldn't have fixed this issue now without first doing something with pg_file_settings. Now we suppress duplicates by marking them "ignored" within ProcessConfigFileInternal, which doesn't hide them in the view.) Lesser changes include: Drive the view directly off the ConfigVariable list, instead of making a basically-equivalent second copy of the data. There's no longer any need to hang onto the data permanently, anyway. Convert show_all_file_settings() to do its work in one call and return a tuplestore; this avoids risks associated with assuming that the GUC state will hold still over the course of query execution. (I think there were probably latent bugs here, though you might need something like a cursor on the view to expose them.) Arrange to run SIGHUP processing in a short-lived memory context, to forestall process-lifespan memory leaks. (There is one known leak in this code, in ProcessConfigDirectory; it seems minor enough to not be worth back-patching a specific fix for.) Remove mistaken assignment to ConfigFileLineno that caused line counting after an include_dir directive to be completely wrong. Add missed failure check in AlterSystemSetConfigFile(). We don't really expect ParseConfigFp() to fail, but that's not an excuse for not checking.
2015-06-29 00:06:14 +02:00
Add system view <link
linkend="view-pg-file-settings"><structname>pg_file_settings</></>
to show the contents of the server's configuration files
(Sawada Masahiko)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-05-14 [a486e35] Peter ..: Add pg_settings.pending_restart column
-->
2015-06-11 06:08:55 +02:00
<para>
Add <structname>pending_restart</> to the system view <link
linkend="view-pg-settings"><structname>pg_settings</></> to
indicate a change has been made but will not take effect until a
database restart (Peter Eisentraut)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-09-02 [bd3b7a9] Fujii ..: Support ALTER SYSTEM RESET command.
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link linkend="SQL-ALTERSYSTEM"><command>ALTER SYSTEM</></>
values to be reset with <command>ALTER SYSTEM RESET</> (Vik
Fearing)
2015-06-11 06:08:55 +02:00
</para>
<para>
This command removes the specified setting
from <filename>postgresql.auto.conf</>.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Replication and Recovery</title>
<itemizedlist>
<listitem>
<!--
2015-09-26 [bd7c348] Andres..: Rework the way multixact truncations work.
2015-09-26 [6e8af37] Andres..: Remove legacy multixact truncation support.
-->
<para>
Rework truncation of the multixact commit log to be properly
WAL-logged (Andres Freund)
</para>
<para>
This makes things substantially simpler and more robust.
</para>
</listitem>
<listitem>
<!--
2014-11-25 [aedccb1] Simon ..: action_at_recovery_target recovery config option
2014-12-07 [b8e33a8] Simon ..: Tweaks for recovery_target_action
2015-03-15 [51c11a7] Andres..: Remove pause_at_recovery_target recovery.conf s..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <link linkend="recovery-config"><filename>recovery.conf</></>
parameter <link
linkend="recovery-target-action"><varname>recovery_target_action</></>
to control post-recovery activity (Petr Jel&iacute;nek)
2015-06-11 06:08:55 +02:00
</para>
<para>
This replaces the old parameter <varname>pause_at_recovery_target</>.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-05-15 [ffd3774] Heikki..: Add archive_mode='always' option.
-->
2015-06-11 06:08:55 +02:00
<para>
Add new <xref linkend="guc-archive-mode"> value
<literal>always</> to allow standbys to always archive received
<acronym>WAL</> files (Fujii Masao)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-02-23 [5d2b45e] Fujii ..: Add GUC to control the time to wait before retr..
-->
2015-06-11 06:08:55 +02:00
<para>
Add configuration
parameter <xref linkend="guc-wal-retrieve-retry-interval"> to
control <acronym>WAL</> read retry after failure
(Alexey Vasiliev, Michael Paquier)
2015-06-11 06:08:55 +02:00
</para>
<para>
This is particularly helpful for warm standbys.
</para>
</listitem>
<listitem>
<!--
2015-03-11 [57aa5b2] Fujii ..: Add GUC to enable compression of full page imag..
-->
<para>
Allow compression of full-page images stored in <acronym>WAL</>
(Rahila Syed, Michael Paquier)
</para>
<para>
This feature reduces WAL volume, at the cost of more CPU time spent
on WAL logging and WAL replay. It is controlled by a new
configuration parameter <xref linkend="guc-wal-compression">, which
currently is off by default.
</para>
</listitem>
<listitem>
<!--
2015-05-08 [de76884] Heikki..: At promotion, archive last segment from old tim..
-->
2015-06-11 06:08:55 +02:00
<para>
Archive <acronym>WAL</> files with suffix <literal>.partial</>
during standby promotion (Heikki Linnakangas)
</para>
</listitem>
<listitem>
<!--
2014-09-13 [4ad2a54] Fujii ..: Add GUC to enable logging of replication comman..
-->
2015-06-11 06:08:55 +02:00
<para>
Add configuration parameter <xref
linkend="guc-log-replication-commands">
to log replication commands (Fujii Masao)
2015-06-11 06:08:55 +02:00
</para>
<para>
By default, replication commands, e.g. <link
linkend="protocol-replication"><literal>IDENTIFY_SYSTEM</></>,
are not logged, even when <xref linkend="guc-log-statement"> is set
to <literal>all</>.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-04-29 [5aa2350] Andres..: Introduce replication progress tracking infrast..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link linkend="pg-replication-origin-create">labeling</> of
the origin of logical replication changes, and provide mechanisms
for tracking the progress of replication (Andres Freund)
2015-06-11 06:08:55 +02:00
</para>
<para>
This is helpful when implementing replication solutions.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-04-21 [d811c03] Andres..: Add 'active_in' column to pg_replication_slots.
-->
2015-06-11 06:08:55 +02:00
<para>
Report the processes holding replication slots in <link
linkend="catalog-pg-replication-slots"><structname>pg_replication_slots</></>
(Craig Ringer)
2015-06-11 06:08:55 +02:00
</para>
<para>
The new output column is <structname>active_pid</>.
</para>
</listitem>
<listitem>
<!--
2014-11-25 [b3fc672] Heikki..: Allow using connection URI in primary_conninfo.
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <filename>recovery.conf</>'s <link
linkend="primary-conninfo"><varname>primary_conninfo</></> setting to
use connection <acronym>URI</>s, e.g. <literal>postgres://</>
(Alexander Shulgin)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Queries</title>
<itemizedlist>
<listitem>
<!--
2015-05-08 [168d580] Andres..: Add support for INSERT ... ON CONFLICT DO NOTHI..
2015-05-08 [2c8f483] Andres..: Represent columns requiring insert and update p..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link linkend="sql-on-conflict"><command>INSERT</></>s
that would generate constraint conflicts to be turned into
<command>UPDATE</>s or ignored (Peter Geoghegan, Heikki
Linnakangas, Andres Freund)
2015-06-11 06:08:55 +02:00
</para>
<para>
The syntax is <command>INSERT ... ON CONFLICT DO NOTHING/UPDATE</>.
This is the Postgres implementation of the popular
<command>UPSERT</> command.
</para>
</listitem>
<listitem>
<!--
2015-05-16 [f3d3118] Andres..: Support GROUPING SETS, CUBE and ROLLUP.
-->
2015-06-11 06:08:55 +02:00
<para>
Add <literal>GROUP BY</> analysis features <link
linkend="queries-grouping-sets"><literal>GROUPING SETS</></>,
<link linkend="queries-grouping-sets"><literal>CUBE</></> and
<link linkend="queries-grouping-sets"><literal>ROLLUP</></>
(Andrew Gierth, Atri Sharma)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-06-18 [8f889b1] Tom Lane: Implement UPDATE tab SET (col1,col2,...) = (SEL..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow setting multiple target columns in
an <link linkend="SQL-UPDATE"><command>UPDATE</></> from the result of
a single sub-SELECT (Tom Lane)
2015-06-11 06:08:55 +02:00
</para>
<para>
This is accomplished using the syntax <command>UPDATE tab SET
(col1, col2, ...) = (SELECT ...)</>.
</para>
</listitem>
<listitem>
<!--
2014-10-07 [df630b0] Alvaro..: Implement SKIP LOCKED for row-level locks
-->
2015-06-11 06:08:55 +02:00
<para>
Add <link linkend="SQL-SELECT"><command>SELECT</></> option
<literal>SKIP LOCKED</> to skip locked rows (Thomas Munro)
2015-06-11 06:08:55 +02:00
</para>
<para>
This does not throw an error for locked rows like
<literal>NOWAIT</> does.
</para>
</listitem>
<listitem>
<!--
2015-05-15 [f6d208d] Simon ..: TABLESAMPLE, SQL Standard and extensible
-->
2015-06-11 06:08:55 +02:00
<para>
Add <link linkend="SQL-SELECT"><command>SELECT</></> option
<literal>TABLESAMPLE</> to return a subset of a table (Petr
Jel&iacute;nek)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-11 [e529cd4] Robert..: Suggest to the user the column they may have m..
-->
2015-06-11 06:08:55 +02:00
<para>
Suggest possible matches for mistyped column names (Peter
Geoghegan, Robert Haas)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Utility Commands</title>
<itemizedlist>
<listitem>
<!--
2015-01-16 [20af53d] Tom Lane: Show sort ordering options in EXPLAIN output.
-->
2015-06-11 06:08:55 +02:00
<para>
Add more details about sort ordering in <link
linkend="SQL-EXPLAIN"><command>EXPLAIN</></> output (Marius Timmer,
Lukas Kreft, Arne Scheffer)
2015-06-11 06:08:55 +02:00
</para>
<para>
Details include <literal>COLLATE</>, <literal>DESC</>,
<literal>USING</>, and <literal>NULLS FIRST</><literal>/LAST</>.
</para>
</listitem>
<listitem>
<!--
2014-12-18 [35192f0] Alvaro..: Have VACUUM log number of skipped pages due to ..
-->
2015-06-11 06:08:55 +02:00
<para>
Have <link linkend="SQL-VACUUM"><command>VACUUM</></> log the
number of pages skipped due to pins (Jim Nasby)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-02-20 [d42358e] Alvaro..: Have TRUNCATE update pgstat tuple counters
-->
2015-06-11 06:08:55 +02:00
<para>
Have <link linkend="SQL-TRUNCATE"><command>TRUNCATE</></> properly
update the <literal>pg_stat</>* tuple counters (Alexander Shulgin)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
<sect4>
<title><xref linkend="SQL-REINDEX"></title>
<itemizedlist>
<listitem>
<!--
2014-12-09 [fe263d1] Simon ..: REINDEX SCHEMA
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <command>REINDEX</> to reindex an entire schema using the
<literal>SCHEMA</> option (Sawada Masahiko)
</para>
</listitem>
<listitem>
<!--
2015-05-15 [ecd222e] Fujii ..: Support VERBOSE option in REINDEX command.
-->
2015-06-11 06:08:55 +02:00
<para>
Add <literal>VERBOSE</> option to <command>REINDEX</> (Sawada
Masahiko)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-12-09 [ae4e688] Simon ..: Silence REINDEX
-->
2015-06-11 06:08:55 +02:00
<para>
Prevent <command>REINDEX DATABASE</> and <command>SCHEMA</>
from outputting object names, unless <literal>VERBOSE</> is used
(Simon Riggs)
</para>
</listitem>
<listitem>
<!--
2015-04-09 [17d436d] Fujii ..: Remove obsolete FORCE option from REINDEX.
-->
2015-06-11 06:08:55 +02:00
<para>
Remove obsolete <literal>FORCE</> option from <command>REINDEX</>
(Fujii Masao)
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Object Manipulation</title>
<itemizedlist>
<listitem>
<!--
2014-09-19 [491c029] Stephe..: Row-Level Security Policies (RLS)
-->
2015-06-11 06:08:55 +02:00
<para>
Add row-level security control (Craig Ringer, KaiGai Kohei,
Adam Brightwell, Dean Rasheed, Stephen Frost)
</para>
<para>
This feature allows row-by-row control over which users can add,
modify, or even see rows in a table. This is controlled by new
commands <link linkend="SQL-CREATEPOLICY"><command>CREATE</></>/<link
linkend="SQL-ALTERPOLICY"><command>ALTER</></>/<link
linkend="SQL-DROPPOLICY"><command>DROP POLICY</></> and <link
linkend="SQL-ALTERTABLE"><command>ALTER TABLE ... ENABLE/DISABLE
ROW SECURITY</></>.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-08-22 [f41872d] Alvaro..: Implement ALTER TABLE .. SET LOGGED / UNLOGGED
-->
2015-06-11 06:08:55 +02:00
<para>
Allow changing of the <acronym>WAL</acronym>
logging status of a table after creation with <link
linkend="SQL-ALTERTABLE"><command>ALTER TABLE ... SET LOGGED /
UNLOGGED</></> (Fabr&iacute;zio de Royes Mello)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-08-26 [0076f26] Heikki..: Implement IF NOT EXISTS for CREATE SEQUENCE.
2014-11-06 [08309aa] Fujii ..: Implement IF NOT EXIST for CREATE INDEX.
2014-12-13 [e39b6f9] Andrew..: Add CINE option for CREATE TABLE AS and CREATE ..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <literal>IF NOT EXISTS</> clause to <link
linkend="SQL-CREATETABLEAS"><command>CREATE TABLE AS</></>,
<link linkend="SQL-CREATEINDEX"><command>CREATE INDEX</></>,
<link linkend="SQL-CREATESEQUENCE"><command>CREATE SEQUENCE</></>,
and <link linkend="SQL-CREATEMATERIALIZEDVIEW"><command>CREATE
MATERIALIZED VIEW</></> (Fabr&iacute;zio de Royes Mello)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-24 [1d8198b] Bruce ..: Add support for ALTER TABLE IF EXISTS ... RENAM..
-->
2015-06-11 06:08:55 +02:00
<para>
Add support for <literal>IF EXISTS</> to <link
linkend="SQL-ALTERTABLE"><command>ALTER TABLE ... RENAME
CONSTRAINT</></> (Bruce Momjian)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-09 [31eae60] Alvaro..: Allow CURRENT/SESSION_USER to be used in certai..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <literal>CURRENT</><literal>/SESSION_USER</> to specify the
current user in some commands (Kyotaro Horiguchi, &Aacute;lvaro
Herrera)
2015-06-11 06:08:55 +02:00
</para>
<para>
This includes <link linkend="SQL-ALTERUSER"><command>ALTER
USER</></>, <link linkend="SQL-ALTERGROUP"><command>ALTER
GROUP</></>, <link linkend="SQL-ALTERROLE"><command>ALTER
ROLE</></>, <link linkend="SQL-GRANT"><command>GRANT</></>,
and various <command>ALTER <replaceable>object</> OWNER TO</> commands.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-06-21 [ad89a5d] Alvaro..: Add transforms to pg_get_object_address and fr..
-->
2015-06-11 06:08:55 +02:00
<para>
Support comments on <link linkend="SQL-CREATEDOMAIN">domain
constraints</> (&Aacute;lvaro Herrera)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-04-05 [0ef0396] Simon ..: Reduce lock levels of some trigger DDL and add ..
-->
2015-06-11 06:08:55 +02:00
<para>
Reduce lock levels of some create and alter trigger and foreign
key commands (Simon Riggs, Andreas Karlsson)
</para>
</listitem>
<listitem>
<!--
2015-05-11 [fa26424] Stephe..: Allow LOCK TABLE .. ROW EXCLUSIVE MODE with IN..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link linkend="SQL-LOCK"><command>LOCK TABLE ... ROW EXCLUSIVE
MODE</></> for those with <command>INSERT</> privileges (Stephen
Frost)
2015-06-11 06:08:55 +02:00
</para>
<para>
Previously this command required <command>UPDATE</>, <command>DELETE</>,
or <command>TRUNCATE</> privileges.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-23 [e5f455f] Tom Lane: Apply table and domain CHECK constraints in nam.
-->
2015-06-11 06:08:55 +02:00
<para>
Apply table and domain <literal>CHECK</> constraints in name order
(Tom Lane)
</para>
<para>
The previous order was indeterminate.
</para>
</listitem>
<listitem>
<!--
2014-07-01 [15c82ef] Tom Lane: Refactor CREATE/ALTER DATABASE syntax so option..
2014-07-01 [fbb1d7d] Tom Lane: Allow CREATE/ALTER DATABASE to manipulate datis..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link
linkend="SQL-CREATEDATABASE"><command>CREATE</></>/<link
linkend="SQL-ALTERDATABASE"><command>ALTER DATABASE</></>
to manipulate <structname>datistemplate</> and
<structname>datallowconn</> (Vik Fearing)
2015-06-11 06:08:55 +02:00
</para>
<para>
This allows these per-database settings to be
changed without manually modifying the <link
linkend="catalog-pg-database"><structname>pg_database</></>
system catalog.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
<sect4>
<title><xref linkend="SQL-CREATEFOREIGNDATAWRAPPER"></title>
<itemizedlist>
<listitem>
<!--
2014-07-10 [59efda3] Tom Lane: Implement IMPORT FOREIGN SCHEMA.
-->
2015-06-11 06:08:55 +02:00
<para>
Add support for <link
linkend="SQL-IMPORTFOREIGNSCHEMA"><command>IMPORT FOREIGN
SCHEMA</></> (Ronan Dunklau, Michael Paquier, Tom Lane)
2015-06-11 06:08:55 +02:00
</para>
<para>
This command allows automatic creation of local foreign tables
that match the structure of existing tables on a remote server.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-12-17 [fc2ac1f] Tom Lane: Allow CHECK constraints to be placed on foreign..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <literal>CHECK</> constraints to be placed on foreign tables
(Shigeru Hanada, Etsuro Fujita)
2015-06-11 06:08:55 +02:00
</para>
<para>
Such constraints are assumed to be enforced on the remote server,
and are not enforced locally. However, they are assumed to hold for
purposes of query optimization, such
as <link linkend="ddl-partitioning-constraint-exclusion">constraint
exclusion</>.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-22 [cb1ca4d] Tom Lane: Allow foreign tables to participate in inherita..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow foreign tables to participate in inheritance (Shigeru Hanada,
Etsuro Fujita)
2015-06-11 06:08:55 +02:00
</para>
<para>
To let this work naturally, foreign tables are now allowed to have
check constraints marked as not valid, and to set storage
and <type>OID</> characteristics, even though these operations are
effectively no-ops for a foreign table.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-05-01 [e7cb7ee] Robert..: Allow FDWs and custom scan providers to replace..
2015-05-10 [1a8a4e5] Tom Lane: Code review for foreign/custom join pushdown pa..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow foreign data wrappers and custom scans to implement join
pushdown (KaiGai Kohei)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title><xref linkend="SQL-CREATEEVENTTRIGGER"></title>
<itemizedlist>
<listitem>
<!--
2015-05-11 [b488c58] Alvaro..: Allow on-the-fly capture of DDL event details
-->
2015-06-11 06:08:55 +02:00
<para>
Whenever a <literal>ddl_command_end</> event trigger is installed,
capture details of <acronym>DDL</> activity for it to inspect
(&Aacute;lvaro Herrera)
</para>
<para>
This information is available through a set-returning function <link
linkend="pg-event-trigger-ddl-command-end-functions"><function>pg_event_trigger_ddl_commands()</></link>,
or by inspection of C data structures if that function doesn't
provide enough detail.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-12-08 [618c943] Simon ..: Event Trigger for table_rewrite
-->
2015-06-11 06:08:55 +02:00
<para>
Allow event triggers on table rewrites caused by <link
linkend="SQL-ALTERTABLE"><command>ALTER TABLE</></> (Dimitri
Fontaine)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-02-23 [296f3a6] Alvaro..: Support more commands in event triggers
-->
2015-06-11 06:08:55 +02:00
<para>
Add event trigger support for database-level <link
linkend="SQL-COMMENT"><command>COMMENT</></>, <link
linkend="SQL-SECURITY-LABEL"><command>SECURITY LABEL</></>,
and <link linkend="SQL-GRANT"><command>GRANT</></>/<link
linkend="SQL-REVOKE"><command>REVOKE</></> (&Aacute;lvaro Herrera)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-12-30 [72dd233] Alvaro..: pg_event_trigger_dropped_objects: Add name/args..
2015-04-06 [e9a077c] Alvaro..: pg_event_trigger_dropped_objects: add is_temp c..
-->
2015-06-11 06:08:55 +02:00
<para>
Add columns to the output of <link
linkend="pg-event-trigger-sql-drop-functions"><function>pg_event_trigger_dropped_objects</></>
(&Aacute;lvaro Herrera)
2015-06-11 06:08:55 +02:00
</para>
<para>
This allows simpler processing of delete operations.
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Data Types</title>
<itemizedlist>
<listitem>
<!--
2014-09-09 [57b1085] Peter ..: Allow empty content in xml type
-->
2015-06-11 06:08:55 +02:00
<para>
Allow the <link linkend="datatype-xml"><type>xml</></> data type
to accept empty or all-whitespace content values (Peter Eisentraut)
2015-06-11 06:08:55 +02:00
</para>
<para>
This is required by the <acronym>SQL</>/<acronym>XML</>
specification.
</para>
</listitem>
<listitem>
<!--
2014-10-21 [6f04368] Peter ..: Allow input format xxxx-xxxx-xxxx for macaddr ..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link linkend="datatype-macaddr"><type>macaddr</></> input
using the format <literal>xxxx-xxxx-xxxx</> (Herwin Weststrate)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-10-18 [417f924] Bruce ..: interval: tighten precision specification
-->
2015-06-11 06:08:55 +02:00
<para>
Disallow non-SQL-standard syntax for <link
linkend="datatype-interval-input"><type>interval</></link> with
both precision and field specifications (Bruce Momjian)
2015-06-11 06:08:55 +02:00
</para>
<para>
Per the standard, such type specifications should be written as,
for example, <literal>INTERVAL MINUTE TO SECOND(2)</>.
<productname>PostgreSQL</> formerly allowed this to be written as
<literal>INTERVAL(2) MINUTE TO SECOND</>, but it must now be
written in the standard way.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-04-01 [89840d7] Tom Lane: Provide real selectivity estimators for inet/ci..
-->
2015-06-11 06:08:55 +02:00
<para>
Add selectivity estimators for <link
linkend="datatype-inet"><type>inet</></>/<link
linkend="datatype-cidr"><type>cidr</></> operators and improve
estimators for text search functions (Emre Hasegeli, Tom Lane)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-05-09 [0c90f67] Andrew..: Add new OID alias type regrole
2015-05-09 [cb9fa80] Andrew..: Add new OID alias type regnamespace
-->
<para>
Add data
types <link linkend="datatype-oid-table"><type>regrole</></link>
and <link linkend="datatype-oid-table"><type>regnamespace</></link>
that simplify entering and pretty-printing the <type>OID</> of a role
or namespace (Kyotaro Horiguchi)
</para>
</listitem>
2015-06-11 06:08:55 +02:00
</itemizedlist>
<sect4>
<title><link linkend="datatype-json"><acronym>JSON</></link></title>
<itemizedlist>
<listitem>
<!--
2015-05-12 [c694701] Andrew..: Additional functions and operators for jsonb
2015-05-31 [37def42] Andrew..: Rename jsonb_replace to jsonb_set and allow it ..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <type>jsonb</> functions <link
linkend="functions-json-processing-table"><function>jsonb_set()</></>
and <link
linkend="functions-json-processing-table"><function>jsonb_pretty()</></>
(Dmitry Dolgov, Andrew Dunstan, Petr Jel&iacute;nek)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-12-12 [7e354ab] Andrew..: Add several generator functions for jsonb that ..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <type>jsonb</> generator functions <link
linkend="functions-json-creation-table"><function>to_jsonb()</></>,
<link
linkend="functions-json-creation-table"><function>jsonb_object()</></>,
<link
linkend="functions-json-creation-table"><function>jsonb_build_object()</></>,
<link
linkend="functions-json-creation-table"><function>jsonb_build_array()</></>,
<link
linkend="functions-aggregate-table"><function>jsonb_agg()</></>,
and <link
linkend="functions-aggregate-table"><function>jsonb_object_agg()</></>
(Andrew Dunstan)
</para>
<para>
Equivalent functions already existed for type <type>json</>.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-03 [b67f1ce] Tom Lane: Reduce json <=> jsonb casts from explicit-only..
-->
2015-06-11 06:08:55 +02:00
<para>
Reduce casting requirements to/from <link
linkend="datatype-json"><type>json</></> and <link
linkend="datatype-json"><type>jsonb</></> (Tom Lane)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-06-11 [908e234] Andrew..: Rename jsonb - text[] operator to #- to avoid a..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <type>text</>, <type>text</> array, and <type>integer</>
values to be <link linkend="functions-jsonb-op-table">subtracted</>
from <type>jsonb</> documents (Dmitry Dolgov, Andrew Dunstan)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-05-12 [c694701] Andrew..: Additional functions and operators for jsonb
-->
2015-06-11 06:08:55 +02:00
<para>
Add <type>jsonb</> <link
linkend="functions-jsonb-op-table"><literal>||</></> operator
(Dmitry Dolgov, Andrew Dunstan)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-12-12 [237a882] Andrew..: Add json_strip_nulls and jsonb_strip_nulls fun..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <link
linkend="functions-json-processing-table"><function>json_strip_nulls()</></>
and <link
linkend="functions-json-processing-table"><function>jsonb_strip_nulls()</></>
functions to remove JSON null values from documents
(Andrew Dunstan)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Functions</title>
<itemizedlist>
<listitem>
<!--
2014-11-11 [1871c89] Fujii ..: Add generate_series(numeric, numeric).
-->
2015-06-11 06:08:55 +02:00
<para>
Add <link linkend="functions-srf"><function>generate_series()</></>
for <type>numeric</> values (Plato Malugin)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-11-25 [bac2739] Tom Lane: Support arrays as input to array_agg() and ARRA..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link
linkend="functions-aggregate-table"><function>array_agg()</></> and
<function>ARRAY()</> to take arrays as inputs (Ali Akbar, Tom Lane)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-18 [13dbc7a] Alvaro..: array_offset() and array_offsets()
2015-03-30 [97690ea] Alvaro..: Change array_offset to return subscripts, not o..
-->
2015-06-11 06:08:55 +02:00
<para>
Add functions <link
linkend="array-functions-table"><function>array_position()</></>
and <link
linkend="array-functions-table"><function>array_positions()</></>
to return subscripts of array values (Pavel Stehule)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-12-15 [4520ba6] Heikki..: Add point <-> polygon distance operator.
-->
2015-06-11 06:08:55 +02:00
<para>
Add a <link
linkend="gist-builtin-opclasses-table"><type>point</>-to-<type>polygon</></>
distance operator (&lt;-&gt;) (Alexander Korotkov)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-08-27 [8167a38] Jeff D..: Allow multibyte characters as escape in SIMILA..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow multibyte characters as escapes in <link
linkend="functions-similarto-regexp"><literal>SIMILAR TO</></>
and <link linkend="functions-string-sql"><literal>SUBSTRING</></>
(Jeff Davis)
2015-06-11 06:08:55 +02:00
</para>
<para>
Previously, only a single-byte character was allowed as an escape.
</para>
</listitem>
<listitem>
<!--
2014-09-09 [e80252d] Tom Lane: Add width_bucket(anyelement, anyarray).
-->
2015-06-11 06:08:55 +02:00
<para>
Add a <link
linkend="functions-math-func-table"><function>width_bucket()</></>
variant that supports any sortable data type and non-uniform bucket
widths (Petr Jel&iacute;nek)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-06-28 [cb2acb1] Heikki..: Add missing_ok option to the SQL functions for..
-->
<para>
Add an optional <replaceable>missing_ok</> argument to <link
linkend="functions-admin-genfile-table"><function>pg_read_file()</></>
and related functions (Michael Paquier, Heikki Linnakangas)
</para>
</listitem>
<listitem>
<!--
2015-03-10 [865f14a] Robert..: Allow named parameters to be specified using =>..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link linkend="sql-syntax-calling-funcs"><literal>=&gt;</></>
to specify named parameters in function calls (Pavel Stehule)
2015-06-11 06:08:55 +02:00
</para>
<para>
Previously only <literal>:=</> could be used. This requires removing
the possibility for <literal>=&gt;</> to be a user-defined operator.
Creation of user-defined <literal>=&gt;</> operators has been issuing
2015-09-11 03:22:21 +02:00
warnings since PostgreSQL 9.0.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-25 [06bf0dd] Tom Lane: Upgrade src/port/rint.c to be POSIX-compliant.
-->
2015-06-11 06:08:55 +02:00
<para>
Add <acronym>POSIX</>-compliant rounding for platforms that use
2015-09-11 03:22:21 +02:00
PostgreSQL-supplied rounding functions (Pedro Gimeno Fortea)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
<sect4>
<title>System Information Functions and Views</title>
<itemizedlist>
<listitem>
<!--
2014-12-23 [d7ee82e] Alvaro..: Add SQL-callable pg_get_object_address
2014-12-30 [a676201] Alvaro..: Add pg_identify_object_as_address
-->
2015-06-11 06:08:55 +02:00
<para>
Add function <link
linkend="functions-info-object-table"><function>pg_get_object_address()</></>
to return <type>OID</>s that uniquely
identify an object, and function <link
linkend="functions-info-object-table"><function>pg_identify_object_as_address()</></>
to return object information based on <type>OID</>s (&Aacute;lvaro
Herrera)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-19 [bf03889] Stephe..: GetUserId() changes to has_privs_of_role()
-->
2015-06-11 06:08:55 +02:00
<para>
Loosen security checks for viewing queries in <link
linkend="pg-stat-activity-view"><structname>pg_stat_activity</></>,
executing <link
linkend="functions-admin-signal-table"><function>pg_cancel_backend()</></>,
and executing <link
linkend="functions-admin-signal-table"><function>pg_terminate_backend()</></>
(Stephen Frost)
2015-06-11 06:08:55 +02:00
</para>
<para>
Previously, only the specific role owning the target session could
perform these operations; now membership in that role is sufficient.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-02-19 [2fb7a75] Tom Lane: Add pg_stat_get_snapshot_timestamp() to show s..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <link
linkend="monitoring-stats-funcs-table"><function>pg_stat_get_snapshot_timestamp()</></>
2015-09-11 03:22:21 +02:00
to output the time stamp of the statistics snapshot (Matt Kelly)
2015-06-11 06:08:55 +02:00
</para>
<para>
This represents the last time the snapshot file was written to
the file system.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-09-10 [36ad1a8] Bruce ..: Implement mxid_age() to compute multi-xid age
-->
2015-06-11 06:08:55 +02:00
<para>
Add <link
linkend="vacuum-for-multixact-wraparound"><function>mxid_age()</></>
to compute multi-xid age (Bruce Momjian)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Aggregates</title>
<itemizedlist>
<listitem>
<!--
2014-08-28 [6c40f83] Tom Lane: Add min and max aggregates for inet/cidr data t..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <function>min()</>/<function>max()</> aggregates
for <link linkend="datatype-inet"><type>inet</></>/<link
linkend="datatype-cidr"><type>cidr</></> data types (Haribabu
Kommi)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-20 [8122e14] Andres..: Add, optional, support for 128bit integers.
2015-03-20 [959277a] Andres..: Use 128-bit math to accelerate some aggregation..
-->
2015-06-11 06:08:55 +02:00
<para>
Use 128-bit integers, where supported, as accumulators for some
aggregate functions (Andreas Karlsson)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Server-Side Languages</title>
<itemizedlist>
<listitem>
<!--
2014-07-03 [8b6010b] Tom Lane: Improve support for composite types in PL/Python.
-->
2015-06-11 06:08:55 +02:00
<para>
Improve support for composite types in <link
linkend="plpython"><application>PL/Python</></> (Ed Behn, Ronan
Dunklau)
2015-06-11 06:08:55 +02:00
</para>
<para>
This allows <application>PL/Python</> functions to return arrays
of composite types.
</para>
</listitem>
<listitem>
<!--
2015-03-11 [1ce7a57] Peter ..: PL/Python: Avoid lossiness in float conversion
-->
2015-06-11 06:08:55 +02:00
<para>
Reduce lossiness of <link
linkend="plpython"><application>PL/Python</></> floating-point value
2015-06-11 06:08:55 +02:00
conversions (Marko Kreen)
</para>
</listitem>
<listitem>
<!--
2015-04-26 [cac7658] Peter ..: Add transforms feature
-->
2015-06-11 06:08:55 +02:00
<para>
Allow specification of conversion routines between <acronym>SQL</>
data types and data types of procedural languages (Peter Eisentraut)
2015-06-11 06:08:55 +02:00
</para>
<para>
This change adds new commands <link
linkend="SQL-CREATETRANSFORM"><command>CREATE</></>/<link
linkend="SQL-DROPTRANSFORM"><command>DROP TRANSFORM</></>.
This also adds optional transformations between the <link
linkend="hstore"><application>hstore</></> and <link
linkend="ltree"><application>ltree</></> types to/from <link
linkend="plperl"><application>PL/Perl</></> and <link
linkend="plpython"><application>PL/Python</></>.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
<sect4>
<title><link linkend="plpgsql">PL/pgSQL</link> Server-Side Language</title>
<itemizedlist>
<listitem>
<!--
2015-05-14 [1dc5ebc] Tom Lane: Support "expanded" objects, particularly arrays..
2015-02-16 [e983c4d] Tom Lane: Rationalize the APIs of array element/slice acc..
2015-02-18 [56a79a8] Tom Lane: Split array_push into separate array_append and..
2015-02-16 [9e3ad1a] Tom Lane: Use fast path in plpgsql's RETURN/RETURN NEXT i..
-->
2015-06-11 06:08:55 +02:00
<para>
Improve <link linkend="plpgsql"><application>PL/pgSQL</></> array
performance (Tom Lane)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-25 [a4847fc] Tom Lane: Add an ASSERT statement in plpgsql.
-->
2015-06-11 06:08:55 +02:00
<para>
Add an <link linkend="plpgsql-statements-assert"><command>ASSERT</></>
statement in <application>PL/pgSQL</> (Pavel Stehule)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-11-25 [bb1b8f6] Tom Lane: De-reserve most statement-introducing keywords ..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow more <link linkend="plpgsql"><application>PL/pgSQL</></>
keywords to be used as identifiers (Tom Lane)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Client Applications</title>
<itemizedlist>
<listitem>
<!--
2015-04-11 [83aca89] Peter ..: Move pg_archivecleanup from contrib/ to src/bin/
2015-04-19 [00882d9] Peter ..: Move pg_test_fsync from contrib/ to src/bin/
2015-04-20 [528c2e4] Peter ..: Move pg_test_timing from contrib/ to src/bin/
2015-04-21 [b0a738f] Peter ..: Move pg_xlogdump from contrib/ to src/bin/
-->
2015-06-11 06:08:55 +02:00
<para>
Move <link
linkend="pgarchivecleanup"><application>pg_archivecleanup</></>,
<link linkend="pgtestfsync"><application>pg_test_fsync</></>,
<link linkend="pgtesttiming"><application>pg_test_timing</></>,
and <link linkend="pgxlogdump"><application>pg_xlogdump</></>
from <filename>contrib</> to <filename>src/bin</> (Peter Eisentraut)
2015-06-11 06:08:55 +02:00
</para>
<para>
This should result in these programs being installed by default in
most installations.
</para>
2015-06-11 06:08:55 +02:00
</listitem>
<listitem>
<!--
2015-03-23 [61081e7] Heikki..: Add pg_rewind, for re-synchronizing a master se..
-->
<para>
Add <link linkend="app-pgrewind"><application>pg_rewind</></>,
which allows re-synchronizing a master server after failback
(Heikki Linnakangas)
</para>
</listitem>
2015-06-11 06:08:55 +02:00
<listitem>
<!--
2014-10-06 [d9f38c7] Andres..: Add support for managing physical replication s..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link
linkend="app-pgreceivexlog"><application>pg_receivexlog</></>
to manage physical replication slots (Michael Paquier)
2015-06-11 06:08:55 +02:00
</para>
<para>
This is controlled via new <option>--create-slot</> and
<option>--drop-slot</> options.
</para>
</listitem>
<listitem>
<!--
2014-11-18 [c4f99d2] Fujii ..: Add &#8211;&#8211;synchronous option to pg_receivexlog, for..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link
linkend="app-pgreceivexlog"><application>pg_receivexlog</></>
to synchronously flush <acronym>WAL</> to storage using new
<option>--synchronous</> option (Furuya Osamu, Fujii Masao)
2015-06-11 06:08:55 +02:00
</para>
<para>
Without this, <acronym>WAL</> files are fsync'ed only on close.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-01-23 [a179232] Alvaro..: vacuumdb: enable parallel mode
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link linkend="APP-VACUUMDB"><application>vacuumdb</></> to
vacuum in parallel using new <option>--jobs</> option (Dilip Kumar)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-11-12 [5094da9] Alvaro..: vacuumdb: don't prompt for passwords over and ..
-->
<para>
In <link linkend="APP-VACUUMDB"><application>vacuumdb</></>, do not
prompt for the same password repeatedly when multiple connections
are necessary (Haribabu Kommi, Michael Paquier)
</para>
</listitem>
<listitem>
<!--
2015-05-15 [458a077] Fujii ..: Support &#8211;&#8211;verbose option in reindexdb.
-->
2015-06-11 06:08:55 +02:00
<para>
Add <option>--verbose</> option to <link
linkend="APP-REINDEXDB"><application>reindexdb</></> (Sawada
Masahiko)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-05-12 [72d422a] Andrew..: Map basebackup tablespaces using a tablespace_..
-->
2015-06-11 06:08:55 +02:00
<para>
Make <link linkend="app-pgbasebackup"><application>pg_basebackup</></>
use a tablespace mapping file when using <application>tar</> format,
to support symbolic links and file paths of 100+ characters in length
on <systemitem class="osname">MS Windows</> (Amit Kapila)
</para>
</listitem>
<listitem>
<!--
2014-09-19 [728f152] Andres..: Add rmgr callback to name xlog record types for..
2014-09-19 [bdd5726] Andres..: Add the capability to display summary statistic..
-->
<para>
Add <link linkend="pgxlogdump"><application>pg_xlogdump</></> option
<option>--stats</> to display summary statistics (Abhijit Menon-Sen)
</para>
2015-06-11 06:08:55 +02:00
</listitem>
</itemizedlist>
<sect4>
<title><xref linkend="APP-PSQL"></title>
<itemizedlist>
<listitem>
<!--
2015-03-31 [9d9991c] Bruce ..: psql: add asciidoc output format
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <application>psql</> to produce AsciiDoc output (Szymon Guz)
</para>
</listitem>
<listitem>
<!--
2014-07-10 [5b214c5] Fujii ..: Add new ECHO mode 'errors' that displays only ..
-->
2015-06-11 06:08:55 +02:00
<para>
Add an <literal>errors</> mode that displays only failed commands
to <application>psql</>'s <varname>ECHO</> variable
2015-06-11 06:08:55 +02:00
(Pavel Stehule)
</para>
<para>
This behavior can also be selected with <application>psql</>'s
2015-06-11 06:08:55 +02:00
<option>-b</> option.
</para>
</listitem>
<listitem>
<!--
2014-09-12 [a2dabf0] Stephe..: Add unicode_{column|header|border}_style to psql
-->
2015-06-11 06:08:55 +02:00
<para>
Provide separate column, header, and border linestyle control
in <application>psql</>'s unicode linestyle (Pavel Stehule)
2015-06-11 06:08:55 +02:00
</para>
<para>
Single or double lines are supported; the default is
2015-06-11 06:08:55 +02:00
<literal>single</>.
</para>
</listitem>
<listitem>
<!--
2014-09-02 [51bb795] Andres..: Add psql PROMPT variable showing which line of ..
-->
2015-06-11 06:08:55 +02:00
<para>
Add new option <literal>%l</> in <application>psql</>'s <link
linkend="APP-PSQL-variables"><envar>PROMPT</></> variables
to display the current multiline statement line number
2015-06-11 06:08:55 +02:00
(Sawada Masahiko)
</para>
</listitem>
<listitem>
<!--
2015-03-28 [7655f4c] Andrew..: Add a pager_min_lines setting to psql
-->
2015-06-11 06:08:55 +02:00
<para>
Add <application>psql</> setting <link
linkend="APP-PSQL-meta-commands"><varname>pager_min_lines</></>
to control pager invocation (Andrew Dunstan)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-11-21 [4077fb4] Andrew..: Fix an error in psql that overcounted output l..
-->
2015-06-11 06:08:55 +02:00
<para>
Improve <application>psql</> line counting used when deciding
to invoke the pager (Andrew Dunstan)
</para>
</listitem>
<listitem>
<!--
2015-12-03 [07338cb] Tom Lane: Clean up some psql issues around handling of t..
2015-12-08 [e90371d] Tom Lane: Make failure to open psql log-file fatal.
-->
<para>
<application>psql</> now fails if the file specified by
an <option>--output</> or <option>--log-file</> switch cannot be
written (Tom Lane, Daniel Verite)
</para>
<para>
Previously, it effectively ignored the switch in such cases.
</para>
</listitem>
<listitem>
<!--
2014-07-12 [bd40951] Andres..: Minimal psql tab completion support for SET se..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <application>psql</> tab completion when setting the
<xref linkend="guc-search-path"> variable (Jeff Janes)
2015-06-11 06:08:55 +02:00
</para>
<para>
Currently only the first schema can be tab-completed.
</para>
</listitem>
<listitem>
<!--
2014-06-23 [631e7f6] Heikki..: Improve tab-completion of DROP and ALTER ENABLE..
-->
2015-06-11 06:08:55 +02:00
<para>
Improve <application>psql</>'s tab completion for triggers and rules
2015-06-11 06:08:55 +02:00
(Andreas Karlsson)
</para>
</listitem>
</itemizedlist>
<sect5>
<title><link linkend="APP-PSQL-meta-commands">Backslash Commands</link></title>
<itemizedlist>
<listitem>
<!--
2014-09-10 [07c8651] Andres..: Add new psql help topics, accessible to both..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <application>psql</> <command>\?</> help sections
<literal>variables</> and <literal>options</> (Pavel Stehule)
</para>
<para>
<literal>\? variables</> shows <application>psql</>'s special
variables and <literal>\? options</> shows the command-line options.
<command>\? commands</> shows the meta-commands, which is the
traditional output and remains the default. These help displays
can also be obtained with the command-line
option <literal>--help=<replaceable>section</></literal>.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-07-14 [ee80f04] Alvaro..: psql: Show tablespace size in \db+
-->
2015-06-11 06:08:55 +02:00
<para>
Show tablespace size in <application>psql</>'s <literal>\db+</>
(Fabr&iacute;zio de Royes Mello)
</para>
</listitem>
<listitem>
<!--
2015-04-09 [a6f3c1f] Magnus..: Show owner of types in psql \dT+
-->
2015-06-11 06:08:55 +02:00
<para>
Show data type owners in <application>psql</>'s <literal>\dT+</>
(Magnus Hagander)
</para>
</listitem>
<listitem>
<!--
2014-09-04 [f6f654f] Fujii ..: Allow \watch to display query execution time if..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <application>psql</>'s <command>\watch</> to output
2015-06-11 06:08:55 +02:00
<command>\timing</> information (Fujii Masao)
</para>
<para>
Also prevent <option>--echo-hidden</> from echoing
<command>\watch</> queries, since that is generally unwanted.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-11-22 [eca2b9b] Andrew..: Rework echo_hidden for \sf and \ef from commit ..
-->
2015-06-11 06:08:55 +02:00
<para>
Make <application>psql</>'s <literal>\sf</> and <literal>\ef</>
commands honor <envar>ECHO_HIDDEN</> (Andrew Dunstan)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-08-12 [e15c4ab] Fujii ..: Add tab-completion for \unset and valid setting..
-->
2015-06-11 06:08:55 +02:00
<para>
Improve <application>psql</> tab completion for <command>\set</>,
<command>\unset</>, and <literal>:variable</> names (Pavel
Stehule)
</para>
</listitem>
<listitem>
<!--
2014-11-10 [095d401] Robert..: Tab complete second argument to \c with role n..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow tab completion of role names
in <application>psql</> <literal>\c</> commands (Ian Barwick)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
</sect5>
</sect4>
<sect4>
<title><xref linkend="APP-PGDUMP"></title>
<itemizedlist>
<listitem>
<!--
2014-11-17 [be1cc8f] Simon ..: Add pg_dump &#8211;&#8211;snapshot option
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <application>pg_dump</> to share a snapshot taken by another
session using <option>--snapshot</> (Simon Riggs, Michael Paquier)
</para>
<para>
The remote snapshot must have been exported by
<function>pg_export_snapshot()</> or logical replication slot
creation. This can be used to share a consistent snapshot
across multiple <application>pg_dump</> processes.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-11-21 [5f5e68b] Tom Lane: Adopt the GNU convention for handling tar-arch..
-->
<para>
Support table sizes exceeding 8GB in tar archive format (Tom Lane)
</para>
<para>
The POSIX standard for tar format does not allow elements of a tar
archive to exceed 8GB, but most modern implementations of tar
support an extension that does allow it. Use the extension format
when necessary, rather than failing.
</para>
</listitem>
<listitem>
<!--
2014-07-07 [7700597] Tom Lane: In pg_dump, show server and pg_dump versions w..
-->
2015-06-11 06:08:55 +02:00
<para>
Make <application>pg_dump</> always print the server and
2015-06-11 06:08:55 +02:00
<application>pg_dump</> versions (Jing Wang)
</para>
<para>
Previously, version information was only printed in
<option>--verbose</> mode.
</para>
</listitem>
<listitem>
<!--
2015-06-04 [232cd63] Fujii ..: Remove -i/-ignore-version option from pg_dump..
-->
<para>
Remove the long-ignored <option>-i</>/<option>--ignore-version</>
option from <application>pg_dump</>, <application>pg_dumpall</>,
and <application>pg_restore</> (Fujii Masao)
</para>
</listitem>
2015-06-11 06:08:55 +02:00
</itemizedlist>
</sect4>
<sect4>
<title><xref linkend="app-pg-ctl"></title>
<itemizedlist>
<listitem>
<!--
2014-08-25 [ebe30ad] Bruce ..: pg_ctl, pg_upgrade: allow multiple -o/-O opti..
-->
2015-06-11 06:08:55 +02:00
<para>
Support multiple <application>pg_ctl</> <option>-o</> options,
concatenating their values (Bruce Momjian)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-07-17 [c0e4520] Magnus..: Add option to pg_ctl to choose event source for..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow control of <application>pg_ctl</>'s event source logging
on <systemitem class="osname">MS Windows</> (MauMau)
</para>
<para>
This only controls <application>pg_ctl</>, not the server, which
has separate settings in <filename>postgresql.conf</>.
</para>
</listitem>
<listitem>
<!--
2015-11-08 [bdb42ba] Noah M..: Don't connect() to a wildcard address in test_..
-->
<para>
If the server's listen address is set to a wildcard value
(<literal>0.0.0.0</> in IPv4 or <literal>::</> in IPv6), connect via
the loopback address rather than trying to use the wildcard address
literally (Kondo Yuta)
</para>
<para>
This fix primarily affects Windows, since on other platforms
<application>pg_ctl</> will prefer to use a Unix-domain socket.
</para>
</listitem>
2015-06-11 06:08:55 +02:00
</itemizedlist>
</sect4>
<sect4>
<title><xref linkend="pgupgrade"></title>
<itemizedlist>
<listitem>
<!--
2015-04-14 [9fa8b0e] Peter ..: Move pg_upgrade from contrib/ to src/bin/
-->
2015-06-11 06:08:55 +02:00
<para>
Move <application>pg_upgrade</> from <filename>contrib</> to
<filename>src/bin</> (Peter Eisentraut)
</para>
<para>
In connection with this change, the functionality previously
provided by the <application>pg_upgrade_support</> module has been
moved into the core server.
</para>
2015-06-11 06:08:55 +02:00
</listitem>
<listitem>
<!--
2014-08-25 [ebe30ad] Bruce ..: pg_ctl, pg_upgrade: allow multiple -o/-O optio..
-->
2015-06-11 06:08:55 +02:00
<para>
Support multiple <application>pg_upgrade</>
<option>-o</>/<option>-O</> options,
concatenating their values (Bruce Momjian)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-10-10 [33755e8] Heikki..: Change the way encoding and locale checks are d..
-->
2015-06-11 06:08:55 +02:00
<para>
Improve database collation comparisons in
<application>pg_upgrade</> (Heikki Linnakangas)
</para>
</listitem>
<listitem>
<!--
2014-08-25 [2209b39] Bruce ..: pg_upgrade: remove support for 8.3 old clusters
-->
2015-06-11 06:08:55 +02:00
<para>
Remove support for upgrading from 8.3 clusters (Bruce Momjian)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title><xref linkend="pgbench"></title>
<itemizedlist>
<listitem>
<!--
2015-04-13 [81134af] Peter ..: Move pgbench from contrib/ to src/bin/
-->
<para>
Move pgbench from <filename>contrib</> to <filename>src/bin</>
(Peter Eisentraut)
</para>
</listitem>
<listitem>
<!--
2015-09-30 [3c4c5ac] Tatsuo..: Fix incorrect tps number calculation in "exclu..
-->
<para>
Fix calculation of TPS number <quote>excluding connections
establishing</> (Tatsuo Ishii, Fabien Coelho)
</para>
<para>
The overhead for connection establishment was miscalculated whenever
the number of pgbench threads was less than the number of client
connections. Although this is clearly a bug, we won't back-patch it
into pre-9.5 branches since it makes TPS numbers not comparable to
previous results.
</para>
</listitem>
<listitem>
<!--
2014-10-13 [98aed6c] Heikki..: Add &#8211;&#8211;latency-limit option to pgbench.
-->
<para>
Allow counting of pgbench transactions that take over a specified
amount of time (Fabien Coelho)
</para>
<para>
This is controlled by a new <option>--latency-limit</> option.
</para>
</listitem>
<listitem>
<!--
2014-07-30 [ed802e7] Robert..: pgbench: Allow \setrandom to generate Gaussian..
-->
<para>
Allow pgbench to generate Gaussian/exponential distributions
using <command>\setrandom</> (Kondo Mitsumasa, Fabien Coelho)
</para>
</listitem>
<listitem>
<!--
2015-03-02 [878fdcb] Robert..: pgbench: Add a real expression syntax to \set
-->
<para>
Allow <application>pgbench</>'s <command>\set</> command to handle
arithmetic expressions containing more than one operator, and add
<literal>%</> (modulo) to the set of operators it supports
(Robert Haas, Fabien Coelho)
</para>
</listitem>
</itemizedlist>
</sect4>
2015-06-11 06:08:55 +02:00
</sect3>
<sect3>
<title>Source Code</title>
<itemizedlist>
<listitem>
<!--
2014-11-20 [2c03216] Heikki..: Revamp the WAL record format.
-->
2015-06-11 06:08:55 +02:00
<para>
Simplify <link linkend="wal"><acronym>WAL</></> record format
(Heikki Linnakangas)
2015-06-11 06:08:55 +02:00
</para>
<para>
This allows external tools to more easily track what blocks
are modified.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-15 [4f1b890] Andres..: Merge the various forms of transaction commit &..
-->
<para>
Improve the representation of transaction commit and abort WAL
records (Andres Freund)
</para>
</listitem>
<listitem>
<!--
2014-09-25 [b64d92f] Andres..: Add a basic atomic ops API abstracting away pla..
-->
2015-06-11 06:08:55 +02:00
<para>
Add atomic memory operations <acronym>API</> (Andres Freund)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-11-07 [0b03e59] Robert..: Introduce custom path and scan providers.
2014-11-20 [a34fa8e] Tom Lane: Initial code review for CustomScan patch.
2014-11-21 [c2ea228] Tom Lane: Simplify API for initially hooking custom-path ..
2014-11-21 [4477704] Tom Lane: Rearrange CustomScan API.
-->
2015-06-11 06:08:55 +02:00
<para>
Allow custom path and scan methods (KaiGai Kohei, Tom Lane)
</para>
<para>
This allows extensions greater control over the optimizer and
executor.
</para>
</listitem>
<listitem>
<!--
2015-05-12 [afb9249] Tom Lane: Add support for doing late row locking in FDWs.
-->
2015-06-11 06:08:55 +02:00
<para>
Allow foreign data wrappers to do post-filter locking (Etsuro
Fujita)
</para>
</listitem>
<listitem>
<!--
2015-05-08 [168d580] Andres..: Add support for INSERT ... ON CONFLICT DO NOTHI..
2015-05-08 [2c8f483] Andres..: Represent columns requiring insert and update p..
-->
<para>
Foreign tables can now take part in <command>INSERT ... ON CONFLICT
DO NOTHING</> queries (Peter Geoghegan, Heikki Linnakangas,
Andres Freund)
</para>
<para>
Foreign data wrappers must be modified to handle this.
<command>INSERT ... ON CONFLICT DO UPDATE</> is not supported on
foreign tables.
</para>
</listitem>
<listitem>
<!--
2014-12-18 [4a14f13] Tom Lane: Improve hash_create's API for selecting simple-..
-->
<para>
Improve <function>hash_create()</>'s API for selecting
simple-binary-key hash functions (Teodor Sigaev, Tom Lane)
</para>
</listitem>
2015-06-11 06:08:55 +02:00
<listitem>
<!--
2015-04-30 [924bcf4] Robert..: Create an infrastructure for parallel computati..
2014-10-31 [2bd9e41] Robert..: Support frontend-backend protocol communication..
-->
2015-06-11 06:08:55 +02:00
<para>
Improve parallel execution infrastructure (Robert Haas, Amit
Kapila, Noah Misch, Rushabh Lathia, Jeevan Chalke)
</para>
</listitem>
<listitem>
<!--
2014-06-28 [a6d488c] Andres..: Remove Alpha and Tru64 support.
-->
2015-06-11 06:08:55 +02:00
<para>
Remove <productname>Alpha</> (<acronym>CPU</>) and <systemitem
class="osname">Tru64</> (OS) ports (Andres Freund)
</para>
</listitem>
<listitem>
<!--
2014-07-06 [4893ccd] Robert..: Remove swpb-based spinlock implementation for A..
-->
2015-06-11 06:08:55 +02:00
<para>
Remove swap-byte-based spinlock implementation for
<acronym>ARM</>v5 and earlier <acronym>CPU</>s (Robert Haas)
</para>
<para>
<acronym>ARM</>v5's weak memory ordering made this locking
implementation unsafe. Spinlock support is still possible on
newer gcc implementations with atomics support.
</para>
</listitem>
<listitem>
<!--
2015-02-24 [23a7835] Peter ..: Error when creating names too long for tar for..
-->
2015-06-11 06:08:55 +02:00
<para>
Generate an error when excessively long (100+ character) file
paths are written to tar files (Peter Eisentraut)
</para>
<para>
Tar does not support such overly-long paths.
</para>
</listitem>
<listitem>
<!--
2015-05-19 [0b28ea7] Tom Lane: Avoid collation dependence in indexes of syste..
-->
2015-06-11 06:08:55 +02:00
<para>
2015-09-11 03:22:21 +02:00
Change index operator class for columns <link
linkend="catalog-pg-seclabel"><structname>pg_seclabel</></>.<structname>provider</>
and <link
linkend="catalog-pg-shseclabel"><structname>pg_shseclabel</></>.<structname>provider</>
to be <literal>text_pattern_ops</> (Tom Lane)
2015-06-11 06:08:55 +02:00
</para>
<para>
This avoids possible problems with these indexes when different
databases of a cluster have different default collations.
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-09-09 [0709b7e] Robert..: Change the spinlock primitives to function as c..
-->
<para>
Change the spinlock primitives to function as compiler barriers
(Robert Haas)
</para>
</listitem>
2015-06-11 06:08:55 +02:00
</itemizedlist>
<sect4>
<title>MS Windows</title>
<itemizedlist>
<listitem>
<!--
2014-12-08 [519b075] Simon ..: Use GetSystemTimeAsFileTime directly in win32
2014-12-08 [8001fe6] Simon ..: Windows: use GetSystemTimePreciseAsFileTime if ..
-->
2015-06-11 06:08:55 +02:00
<para>
2015-09-11 03:22:21 +02:00
Allow higher-precision time stamp resolution on <systemitem
class="osname">Windows 8</>, <systemitem class="osname">Windows
Server 2012</>, and later Windows systems (Craig Ringer)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2015-03-18 [f9dead5] Alvaro..: Install shared libraries to bin/ in Windows un..
-->
2015-06-11 06:08:55 +02:00
<para>
Install shared libraries to <filename>bin</> in <systemitem
class="osname">MS Windows</> (Peter Eisentraut, Michael Paquier)
</para>
</listitem>
<listitem>
<!--
2015-04-16 [22d0053] Alvaro..: MSVC: install src/test/modules together with c..
-->
2015-06-11 06:08:55 +02:00
<para>
Install <filename>src/test/modules</> together with
<filename>contrib</> on <productname>MSVC</> builds (Michael
Paquier)
</para>
</listitem>
<listitem>
<!--
2014-07-12 [8d9a0e8] Magnus..: Support &#8211;&#8211;with-extra-version equivalent functi..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link linkend="install-procedure">configure</>'s
<option>--with-extra-version</> option to be honored by the
<productname>MSVC</> build (Michael Paquier)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-07-14 [91f03ba] Noah M..: MSVC: Recognize PGFILEDESC in contrib and conv..
-->
2015-06-11 06:08:55 +02:00
<para>
Pass <envar>PGFILEDESC</> into <productname>MSVC</> contrib builds
(Michael Paquier)
</para>
</listitem>
<listitem>
<!--
2014-07-14 [c4a448e] Noah M..: MSVC: Apply icons to all binaries having them ..
-->
2015-06-11 06:08:55 +02:00
<para>
Add icons to all <productname>MSVC</>-built binaries and version
information to all <systemitem class="osname">MS Windows</>
binaries (Noah Misch)
2015-06-11 06:08:55 +02:00
</para>
<para>
MinGW already had such icons.
</para>
</listitem>
<listitem>
<!--
2014-09-10 [311da16] Andres..: Add support for optional_argument to our own ge..
-->
2015-06-11 06:08:55 +02:00
<para>
Add optional-argument support to the internal
<function>getopt_long()</> implementation (Michael Paquier,
Andres Freund)
</para>
<para>
This is used by the <productname>MSVC</> build.
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Additional Modules</title>
<itemizedlist>
<listitem>
<!--
2015-03-27 [717f709] Andrew..: Add stats for min, max, mean, stddev times to p..
-->
2015-06-11 06:08:55 +02:00
<para>
Add statistics for minimum, maximum,
mean, and standard deviation times to <link
linkend="pgstatstatements-columns"><application>pg_stat_statements</></>
(Mitsumasa Kondo, Andrew Dunstan)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-10-01 [32984d8] Heikki..: Add functions for dealing with PGP armor heade..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <link linkend="pgcrypto"><application>pgcrypto</></> function
2015-06-11 06:08:55 +02:00
<function>pgp_armor_headers()</> to extract <productname>PGP</>
armor headers (Marko Tiikkaja, Heikki Linnakangas)
</para>
</listitem>
<listitem>
<!--
2014-06-30 [97c40ce] Tom Lane: Allow empty replacement strings in contrib/unac..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow empty replacement strings in <link
linkend="unaccent"><application>unaccent</></> (Mohammad Alhashash)
2015-06-11 06:08:55 +02:00
</para>
<para>
This is useful in languages where diacritic signs are represented
as separate characters.
</para>
</listitem>
<listitem>
<!--
2014-06-30 [1b24887] Tom Lane: Allow multi-character source strings in contrib..
-->
2015-06-11 06:08:55 +02:00
<para>
2015-09-11 03:22:21 +02:00
Allow multicharacter source strings in <link
linkend="unaccent"><application>unaccent</></> (Tom Lane)
2015-06-11 06:08:55 +02:00
</para>
<para>
This could be useful in languages where diacritic signs are
represented as separate characters. It also allows more complex
unaccent dictionaries.
</para>
</listitem>
<listitem>
<!--
2015-05-15 [9689290] Simon ..: TABLESAMPLE system_rows(limit)
2015-05-15 [149f6f1] Simon ..: TABLESAMPLE system_time(limit)
-->
2015-06-11 06:08:55 +02:00
<para>
Add <filename>contrib</> modules <link
linkend="tsm-system-rows"><application>tsm_system_rows</></> and
<link linkend="tsm-system-time"><application>tsm_system_time</></>
to allow additional table sampling methods (Petr Jel&iacute;nek)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-11-21 [3a82bc6] Heikki..: Add pageinspect functions for inspecting GIN in..
-->
2015-06-11 06:08:55 +02:00
<para>
Add <link linkend="GIN"><acronym>GIN</></>
index inspection functions to <link
linkend="pageinspect"><application>pageinspect</></> (Heikki
Linnakangas, Peter Geoghegan, Michael Paquier)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-08-22 [f577919] Andres..: Add pinning_backends column to the pg_buffercac..
-->
<para>
Add information about buffer pins to <link
linkend="pgbuffercache"><application>pg_buffercache</></> display
(Andres Freund)
</para>
</listitem>
2015-06-11 06:08:55 +02:00
<listitem>
<!--
2015-05-13 [5850b20] Andres..: Add pgstattuple_approx() to the pgstattuple ext..
-->
2015-06-11 06:08:55 +02:00
<para>
Allow <link linkend="pgstattuple"><application>pgstattuple</></>
to report approximate answers with less overhead using
<function>pgstattuple_approx()</> (Abhijit Menon-Sen)
2015-06-11 06:08:55 +02:00
</para>
</listitem>
<listitem>
<!--
2014-11-29 [22dfd11] Alvaro..: Move test modules from contrib to src/test/modu..
2014-12-01 [df761e3] Alvaro..: Move security_label test
-->
2015-06-11 06:08:55 +02:00
<para>
Move <application>dummy_seclabel</>, <application>test_shm_mq</>,
<application>test_parser</>, and <application>worker_spi</>
from <filename>contrib</> to <filename>src/test/modules</>
(&Aacute;lvaro Herrera)
</para>
<para>
These modules are only meant for server testing, so they do not need
to be built or installed when packaging <productname>PostgreSQL</>.
</para>
2015-06-11 06:08:55 +02:00
</listitem>
</itemizedlist>
</sect3>
</sect2>
</sect1>