mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-09-04 21:57:20 +02:00
793 lines
30 KiB
Plaintext
793 lines
30 KiB
Plaintext
<!-- $PostgreSQL: pgsql/doc/src/sgml/monitoring.sgml,v 1.38 2006/09/16 00:30:14 momjian Exp $ -->
|
|
|
|
<chapter id="monitoring">
|
|
<title>Monitoring Database Activity</title>
|
|
|
|
<indexterm zone="monitoring">
|
|
<primary>monitoring</primary>
|
|
<secondary>database activity</secondary>
|
|
</indexterm>
|
|
|
|
<indexterm zone="monitoring">
|
|
<primary>database activity</primary>
|
|
<secondary>monitoring</secondary>
|
|
</indexterm>
|
|
|
|
<para>
|
|
A database administrator frequently wonders, <quote>What is the system
|
|
doing right now?</quote>
|
|
This chapter discusses how to find that out.
|
|
</para>
|
|
|
|
<para>
|
|
Several tools are available for monitoring database activity and
|
|
analyzing performance. Most of this chapter is devoted to describing
|
|
<productname>PostgreSQL</productname>'s statistics collector,
|
|
but one should not neglect regular Unix monitoring programs such as
|
|
<command>ps</>, <command>top</>, <command>iostat</>, and <command>vmstat</>.
|
|
Also, once one has identified a
|
|
poorly-performing query, further investigation may be needed using
|
|
<productname>PostgreSQL</productname>'s <xref linkend="sql-explain"
|
|
endterm="sql-explain-title"> command.
|
|
<xref linkend="using-explain"> discusses <command>EXPLAIN</>
|
|
and other methods for understanding the behavior of an individual
|
|
query.
|
|
</para>
|
|
|
|
<sect1 id="monitoring-ps">
|
|
<title>Standard Unix Tools</Title>
|
|
|
|
<indexterm zone="monitoring-ps">
|
|
<primary>ps</primary>
|
|
<secondary>to monitor activity</secondary>
|
|
</indexterm>
|
|
|
|
<para>
|
|
On most platforms, <productname>PostgreSQL</productname> modifies its
|
|
command title as reported by <command>ps</>, so that individual server
|
|
processes can readily be identified. A sample display is
|
|
|
|
<screen>
|
|
$ ps auxww | grep ^postgres
|
|
postgres 960 0.0 1.1 6104 1480 pts/1 SN 13:17 0:00 postgres -i
|
|
postgres 963 0.0 1.1 7084 1472 pts/1 SN 13:17 0:00 postgres: writer process
|
|
postgres 965 0.0 1.1 6152 1512 pts/1 SN 13:17 0:00 postgres: stats collector process
|
|
postgres 998 0.0 2.3 6532 2992 pts/1 SN 13:18 0:00 postgres: tgl runbug 127.0.0.1 idle
|
|
postgres 1003 0.0 2.4 6532 3128 pts/1 SN 13:19 0:00 postgres: tgl regression [local] SELECT waiting
|
|
postgres 1016 0.1 2.4 6532 3080 pts/1 SN 13:19 0:00 postgres: tgl regression [local] idle in transaction
|
|
</screen>
|
|
|
|
(The appropriate invocation of <command>ps</> varies across different
|
|
platforms, as do the details of what is shown. This example is from a
|
|
recent Linux system.) The first process listed here is the
|
|
master server process. The command arguments
|
|
shown for it are the same ones given when it was launched. The next two
|
|
processes are background worker processes automatically launched by the
|
|
master process. (The <quote>stats collector</> process will not be present
|
|
if you have set
|
|
the system not to start the statistics collector.) Each of the remaining
|
|
processes is a server process handling one client connection. Each such
|
|
process sets its command line display in the form
|
|
|
|
<screen>
|
|
postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <replaceable>activity</>
|
|
</screen>
|
|
|
|
The user, database, and connection source host items remain the same for
|
|
the life of the client connection, but the activity indicator changes.
|
|
The activity may be <literal>idle</> (i.e., waiting for a client command),
|
|
<literal>idle in transaction</> (waiting for client inside a <command>BEGIN</> block),
|
|
or a command type name such as <literal>SELECT</>. Also,
|
|
<literal>waiting</> is attached if the server process is presently waiting
|
|
on a lock held by another server process. In the above example we can infer
|
|
that process 1003 is waiting for process 1016 to complete its transaction and
|
|
thereby release some lock or other.
|
|
</para>
|
|
|
|
<para>
|
|
If you have turned off <xref linkend="guc-update-process-title"> then the
|
|
activity indicator is not updated; the process title is set only once
|
|
when a new process is launched. On some platforms this saves a useful
|
|
amount of per-command overhead, on others it's insignificant.
|
|
</para>
|
|
|
|
<tip>
|
|
<para>
|
|
<productname>Solaris</productname> requires special handling. You must
|
|
use <command>/usr/ucb/ps</command>, rather than
|
|
<command>/bin/ps</command>. You also must use two <option>w</option>
|
|
flags, not just one. In addition, your original invocation of the
|
|
<command>postgres</command> command must have a shorter
|
|
<command>ps</command> status display than that provided by each
|
|
server process. If you fail to do all three things, the <command>ps</>
|
|
output for each server process will be the original <command>postgres</>
|
|
command line.
|
|
</para>
|
|
</tip>
|
|
</sect1>
|
|
|
|
<sect1 id="monitoring-stats">
|
|
<title>The Statistics Collector</Title>
|
|
|
|
<indexterm zone="monitoring-stats">
|
|
<primary>statistics</primary>
|
|
</indexterm>
|
|
|
|
<para>
|
|
<productname>PostgreSQL</productname>'s <firstterm>statistics collector</>
|
|
is a subsystem that supports collection and reporting of information about
|
|
server activity. Presently, the collector can count accesses to tables
|
|
and indexes in both disk-block and individual-row terms.
|
|
</para>
|
|
|
|
<para>
|
|
<productname>PostgreSQL</productname> also supports determining the exact
|
|
command currently being executed by other server processes. This is an
|
|
independent facility that can be enabled or disabled whether or not
|
|
block-level and row-level statistics are being collected.
|
|
</para>
|
|
|
|
<sect2 id="monitoring-stats-setup">
|
|
<title>Statistics Collection Configuration</Title>
|
|
|
|
<para>
|
|
Since collection of statistics adds some overhead to query execution,
|
|
the system can be configured to collect or not collect information.
|
|
This is controlled by configuration parameters that are normally set in
|
|
<filename>postgresql.conf</>. (See <xref linkend="runtime-config"> for
|
|
details about setting configuration parameters.)
|
|
</para>
|
|
|
|
<para>
|
|
The parameter <xref linkend="guc-stats-start-collector"> must be
|
|
set to <literal>true</> for the statistics collector to be launched
|
|
at all. This is the default and recommended setting, but it may be
|
|
turned off if you have no interest in statistics and want to
|
|
squeeze out every last drop of overhead. (The savings is likely to
|
|
be small, however.) Note that this option cannot be changed while
|
|
the server is running.
|
|
</para>
|
|
|
|
<para>
|
|
The parameters <xref linkend="guc-stats-block-level"> and <xref
|
|
linkend="guc-stats-row-level"> control how much information is
|
|
actually sent to the collector and thus determine how much run-time
|
|
overhead occurs. These respectively determine whether a server
|
|
process tracks disk-block-level access
|
|
statistics and row-level access statistics and sends these to the collector.
|
|
Additionally, per-database transaction commit and abort statistics
|
|
are collected if either of these parameters are set.
|
|
</para>
|
|
|
|
<para>
|
|
The parameter <xref linkend="guc-stats-command-string"> enables monitoring
|
|
of the current command being executed by any server process.
|
|
The statistics collector subprocess need not be running to enable this
|
|
feature.
|
|
</para>
|
|
|
|
<para>
|
|
Normally these parameters are set in <filename>postgresql.conf</> so
|
|
that they apply to all server processes, but it is possible to turn
|
|
them on or off in individual sessions using the <xref
|
|
linkend="sql-set" endterm="sql-set-title"> command. (To prevent
|
|
ordinary users from hiding their activity from the administrator,
|
|
only superusers are allowed to change these parameters with
|
|
<command>SET</>.)
|
|
</para>
|
|
|
|
<note>
|
|
<para>
|
|
Since the parameters <varname>stats_block_level</varname>, and
|
|
<varname>stats_row_level</varname> default to <literal>false</>,
|
|
very few statistics are collected in the default
|
|
configuration. Enabling either of these configuration
|
|
variables will significantly increase the amount of useful data
|
|
produced by the statistics facilities, at the expense of
|
|
additional run-time overhead.
|
|
</para>
|
|
</note>
|
|
|
|
</sect2>
|
|
|
|
<sect2 id="monitoring-stats-views">
|
|
<title>Viewing Collected Statistics</Title>
|
|
|
|
<para>
|
|
Several predefined views, listed in <xref
|
|
linkend="monitoring-stats-views-table">, are available to show the results
|
|
of statistics collection. Alternatively, one can
|
|
build custom views using the underlying statistics functions.
|
|
</para>
|
|
|
|
<para>
|
|
When using the statistics to monitor current activity, it is important
|
|
to realize that the information does not update instantaneously.
|
|
Each individual server process transmits new block and row access counts to
|
|
the collector just before going idle; so a query or transaction still in
|
|
progress does not affect the displayed totals. Also, the collector itself
|
|
emits a new report at most once per <varname>PGSTAT_STAT_INTERVAL</varname>
|
|
milliseconds (500 unless altered while building the server). So the
|
|
displayed information lags behind actual activity. However, current-query
|
|
information collected by <varname>stats_command_string</varname> is
|
|
always up-to-date.
|
|
</para>
|
|
|
|
<para>
|
|
Another important point is that when a server process is asked to display
|
|
any of these statistics, it first fetches the most recent report emitted by
|
|
the collector process and then continues to use this snapshot for all
|
|
statistical views and functions until the end of its current transaction.
|
|
So the statistics will appear not to change as long as you continue the
|
|
current transaction. Similarly, information about the current queries of
|
|
all processes is collected when any such information is first requested
|
|
within a transaction, and the same information will be displayed throughout
|
|
the transaction.
|
|
This is a feature, not a bug, because it allows you to perform several
|
|
queries on the statistics and correlate the results without worrying that
|
|
the numbers are changing underneath you. But if you want to see new
|
|
results with each query, be sure to do the queries outside any transaction
|
|
block.
|
|
</para>
|
|
|
|
<table id="monitoring-stats-views-table">
|
|
<title>Standard Statistics Views</title>
|
|
|
|
<tgroup cols="2">
|
|
<thead>
|
|
<row>
|
|
<entry>View Name</entry>
|
|
<entry>Description</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry><structname>pg_stat_activity</></entry>
|
|
<entry>One row per server process, showing database OID, database name,
|
|
process <acronym>ID</>, user OID, user name, current query, query's
|
|
waiting status, time at
|
|
which the current query began execution, time at which the process
|
|
was started, and client's address and port number. The columns
|
|
that report data on the current query are available unless the
|
|
parameter <varname>stats_command_string</varname> has been
|
|
turned off. Furthermore, these columns are only visible if the
|
|
user examining the view is a superuser or the same as the user
|
|
owning the process being reported on.
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_stat_database</></entry>
|
|
<entry>One row per database, showing database OID, database name,
|
|
number of active server processes connected to that database,
|
|
number of transactions committed and rolled back in that database,
|
|
total disk blocks read, and total buffer hits (i.e., block
|
|
read requests avoided by finding the block already in buffer cache).
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_stat_all_tables</></entry>
|
|
<entry>For each table in the current database (including TOAST tables),
|
|
the table OID, schema and table name, the last time the table was
|
|
vacuumed by the user and the autovacuum daemon, the last time the table
|
|
was analyzed by the user and the autovacuum daemon, number of sequential
|
|
scans initiated, number of live rows fetched by sequential
|
|
scans, number of index scans initiated (over all indexes
|
|
belonging to the table), number of live rows fetched by index
|
|
scans,
|
|
and numbers of row insertions, updates, and deletions.</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_stat_sys_tables</></entry>
|
|
<entry>Same as <structname>pg_stat_all_tables</>, except that only
|
|
system tables are shown.</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_stat_user_tables</></entry>
|
|
<entry>Same as <structname>pg_stat_all_tables</>, except that only user
|
|
tables are shown.</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_stat_all_indexes</></entry>
|
|
<entry>For each index in the current database,
|
|
the table and index OID, schema, table and index name,
|
|
number of index scans initiated on that index, number of
|
|
index entries returned by index scans, and number of live table rows
|
|
fetched by simple index scans using that index.
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_stat_sys_indexes</></entry>
|
|
<entry>Same as <structname>pg_stat_all_indexes</>, except that only
|
|
indexes on system tables are shown.</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_stat_user_indexes</></entry>
|
|
<entry>Same as <structname>pg_stat_all_indexes</>, except that only
|
|
indexes on user tables are shown.</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_statio_all_tables</></entry>
|
|
<entry>For each table in the current database (including TOAST tables),
|
|
the table OID, schema and table name, number of disk
|
|
blocks read from that table, number of buffer hits, numbers of
|
|
disk blocks read and buffer hits in all indexes of that table,
|
|
numbers of disk blocks read and buffer hits from that table's
|
|
auxiliary TOAST table (if any), and numbers of disk blocks read
|
|
and buffer hits for the TOAST table's index.
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_statio_sys_tables</></entry>
|
|
<entry>Same as <structname>pg_statio_all_tables</>, except that only
|
|
system tables are shown.</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_statio_user_tables</></entry>
|
|
<entry>Same as <structname>pg_statio_all_tables</>, except that only
|
|
user tables are shown.</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_statio_all_indexes</></entry>
|
|
<entry>For each index in the current database,
|
|
the table and index OID, schema, table and index name,
|
|
numbers of disk blocks read and buffer hits in that index.
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_statio_sys_indexes</></entry>
|
|
<entry>Same as <structname>pg_statio_all_indexes</>, except that only
|
|
indexes on system tables are shown.</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_statio_user_indexes</></entry>
|
|
<entry>Same as <structname>pg_statio_all_indexes</>, except that only
|
|
indexes on user tables are shown.</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_statio_all_sequences</></entry>
|
|
<entry>For each sequence object in the current database,
|
|
the sequence OID, schema and sequence name,
|
|
numbers of disk blocks read and buffer hits in that sequence.
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_statio_sys_sequences</></entry>
|
|
<entry>Same as <structname>pg_statio_all_sequences</>, except that only
|
|
system sequences are shown. (Presently, no system sequences are defined,
|
|
so this view is always empty.)</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><structname>pg_statio_user_sequences</></entry>
|
|
<entry>Same as <structname>pg_statio_all_sequences</>, except that only
|
|
user sequences are shown.</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<para>
|
|
The per-index statistics are particularly useful to determine which
|
|
indexes are being used and how effective they are.
|
|
</para>
|
|
|
|
<para>
|
|
Beginning in <productname>PostgreSQL</productname> 8.1, indexes can be
|
|
used either directly or via <quote>bitmap scans</>. In a bitmap scan
|
|
the output of several indexes can be combined via AND or OR rules;
|
|
so it is difficult to associate individual heap row fetches
|
|
with specific indexes when a bitmap scan is used. Therefore, a bitmap
|
|
scan increments the
|
|
<structname>pg_stat_all_indexes</>.<structfield>idx_tup_read</>
|
|
count(s) for the index(es) it uses, and it increments the
|
|
<structname>pg_stat_all_tables</>.<structfield>idx_tup_fetch</>
|
|
count for the table, but it does not affect
|
|
<structname>pg_stat_all_indexes</>.<structfield>idx_tup_fetch</>.
|
|
</para>
|
|
|
|
<note>
|
|
<para>
|
|
Before <productname>PostgreSQL</productname> 8.1, the
|
|
<structfield>idx_tup_read</> and <structfield>idx_tup_fetch</> counts
|
|
were essentially always equal. Now they can be different even without
|
|
considering bitmap scans, because <structfield>idx_tup_read</> counts
|
|
index entries retrieved from the index while <structfield>idx_tup_fetch</>
|
|
counts live rows fetched from the table; the latter will be less if any
|
|
dead or not-yet-committed rows are fetched using the index.
|
|
</para>
|
|
</note>
|
|
|
|
<para>
|
|
The <structname>pg_statio_</> views are primarily useful to
|
|
determine the effectiveness of the buffer cache. When the number
|
|
of actual disk reads is much smaller than the number of buffer
|
|
hits, then the cache is satisfying most read requests without
|
|
invoking a kernel call. However, these statistics do not give the
|
|
entire story: due to the way in which <productname>PostgreSQL</>
|
|
handles disk I/O, data that is not in the
|
|
<productname>PostgreSQL</> buffer cache may still reside in the
|
|
kernel's I/O cache, and may therefore still be fetched without
|
|
requiring a physical read. Users interested in obtaining more
|
|
detailed information on <productname>PostgreSQL</> I/O behavior are
|
|
advised to use the <productname>PostgreSQL</> statistics collector
|
|
in combination with operating system utilities that allow insight
|
|
into the kernel's handling of I/O.
|
|
</para>
|
|
|
|
<para>
|
|
Other ways of looking at the statistics can be set up by writing
|
|
queries that use the same underlying statistics access functions as
|
|
these standard views do. These functions are listed in <xref
|
|
linkend="monitoring-stats-funcs-table">. The per-database access
|
|
functions take a database OID as argument to identify which
|
|
database to report on. The per-table and per-index functions take
|
|
a table or index OID. (Note that only tables and indexes in the
|
|
current database can be seen with these functions.) The
|
|
per-server-process access functions take a server process
|
|
number, which ranges from one to the number of currently active
|
|
server processes.
|
|
</para>
|
|
|
|
<table id="monitoring-stats-funcs-table">
|
|
<title>Statistics Access Functions</title>
|
|
|
|
<tgroup cols="3">
|
|
<thead>
|
|
<row>
|
|
<entry>Function</entry>
|
|
<entry>Return Type</entry>
|
|
<entry>Description</entry>
|
|
</row>
|
|
</thead>
|
|
|
|
<tbody>
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_db_numbackends</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>integer</type></entry>
|
|
<entry>
|
|
Number of active server processes for database
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_db_xact_commit</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Transactions committed in database
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_db_xact_rollback</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Transactions rolled back in database
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_db_blocks_fetched</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Number of disk block fetch requests for database
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_db_blocks_hit</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Number of disk block fetch requests found in cache for database
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_numscans</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Number of sequential scans done when argument is a table,
|
|
or number of index scans done when argument is an index
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_tuples_returned</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Number of rows read by sequential scans when argument is a table,
|
|
or number of index entries returned when argument is an index
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_tuples_fetched</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Number of table rows fetched by bitmap scans when argument is a table,
|
|
or table rows fetched by simple index scans using the index
|
|
when argument is an index
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_tuples_inserted</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Number of rows inserted into table
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_tuples_updated</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Number of rows updated in table
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_tuples_deleted</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Number of rows deleted from table
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_blocks_fetched</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Number of disk block fetch requests for table or index
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_blocks_hit</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>bigint</type></entry>
|
|
<entry>
|
|
Number of disk block requests found in cache for table or index
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_last_vacuum_time</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>timestamptz</type></entry>
|
|
<entry>
|
|
Time of the last vacuum initiated by the user on this table
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_last_autovacuum_time</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>timestamptz</type></entry>
|
|
<entry>
|
|
Time of the last vacuum initiated by the autovacuum daemon on this table
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_last_analyze_time</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>timestamptz</type></entry>
|
|
<entry>
|
|
Time of the last analyze initiated by the user on this table
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_last_autoanalyze_time</function>(<type>oid</type>)</literal></entry>
|
|
<entry><type>timestamptz</type></entry>
|
|
<entry>
|
|
Time of the last analyze initiated by the autovacuum daemon on this
|
|
table
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_backend_idset</function>()</literal></entry>
|
|
<entry><type>setof integer</type></entry>
|
|
<entry>
|
|
Set of currently active server process numbers (from 1 to the
|
|
number of active server processes). See usage example in the text
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_backend_pid</function>()</literal></entry>
|
|
<entry><type>integer</type></entry>
|
|
<entry>
|
|
Process ID of the server process attached to the current session
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_backend_pid</function>(<type>integer</type>)</literal></entry>
|
|
<entry><type>integer</type></entry>
|
|
<entry>
|
|
Process ID of the given server process
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_backend_dbid</function>(<type>integer</type>)</literal></entry>
|
|
<entry><type>oid</type></entry>
|
|
<entry>
|
|
Database ID of the given server process
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_backend_userid</function>(<type>integer</type>)</literal></entry>
|
|
<entry><type>oid</type></entry>
|
|
<entry>
|
|
User ID of the given server process
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_backend_activity</function>(<type>integer</type>)</literal></entry>
|
|
<entry><type>text</type></entry>
|
|
<entry>
|
|
Active command of the given server process, but only if the
|
|
current user is a superuser or the same user as that of
|
|
the session being queried (and
|
|
<varname>stats_command_string</varname> is on)
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_backend_waiting</function>(<type>integer</type>)</literal></entry>
|
|
<entry><type>boolean</type></entry>
|
|
<entry>
|
|
True if the given server process is waiting for a lock,
|
|
but only if the current user is a superuser or the same user as that of
|
|
the session being queried (and
|
|
<varname>stats_command_string</varname> is on)
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_backend_activity_start</function>(<type>integer</type>)</literal></entry>
|
|
<entry><type>timestamp with time zone</type></entry>
|
|
<entry>
|
|
The time at which the given server process' currently
|
|
executing query was started, but only if the
|
|
current user is a superuser or the same user as that of
|
|
the session being queried (and
|
|
<varname>stats_command_string</varname> is on)
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_backend_start</function>(<type>integer</type>)</literal></entry>
|
|
<entry><type>timestamp with time zone</type></entry>
|
|
<entry>
|
|
The time at which the given server process was started, or
|
|
null if the current user is not a superuser nor the same user
|
|
as that of the session being queried
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_backend_client_addr</function>(<type>integer</type>)</literal></entry>
|
|
<entry><type>inet</type></entry>
|
|
<entry>
|
|
The IP address of the client connected to the given
|
|
server process. Null if the connection is over a Unix domain
|
|
socket. Also null if the current user is not a superuser nor
|
|
the same user as that of the session being queried
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_get_backend_client_port</function>(<type>integer</type>)</literal></entry>
|
|
<entry><type>integer</type></entry>
|
|
<entry>
|
|
The IP port number of the client connected to the given
|
|
server process. -1 if the connection is over a Unix domain
|
|
socket. Null if the current user is not a superuser nor the
|
|
same user as that of the session being queried
|
|
</entry>
|
|
</row>
|
|
|
|
<row>
|
|
<entry><literal><function>pg_stat_reset</function>()</literal></entry>
|
|
<entry><type>boolean</type></entry>
|
|
<entry>
|
|
Reset all block-level and row-level statistics to zero
|
|
</entry>
|
|
</row>
|
|
</tbody>
|
|
</tgroup>
|
|
</table>
|
|
|
|
<note>
|
|
<para>
|
|
<function>blocks_fetched</function> minus
|
|
<function>blocks_hit</function> gives the number of kernel
|
|
<function>read()</> calls issued for the table, index, or
|
|
database; but the actual number of physical reads is usually
|
|
lower due to kernel-level buffering.
|
|
</para>
|
|
</note>
|
|
|
|
<para>
|
|
The function <function>pg_stat_get_backend_idset</function> provides
|
|
a convenient way to generate one row for each active server process. For
|
|
example, to show the <acronym>PID</>s and current queries of all server processes:
|
|
|
|
<programlisting>
|
|
SELECT pg_stat_get_backend_pid(s.backendid) AS procpid,
|
|
pg_stat_get_backend_activity(s.backendid) AS current_query
|
|
FROM (SELECT pg_stat_get_backend_idset() AS backendid) AS s;
|
|
</programlisting>
|
|
</para>
|
|
|
|
</sect2>
|
|
</sect1>
|
|
|
|
<sect1 id="monitoring-locks">
|
|
<title>Viewing Locks</title>
|
|
|
|
<indexterm zone="monitoring-locks">
|
|
<primary>lock</primary>
|
|
<secondary>monitoring</secondary>
|
|
</indexterm>
|
|
|
|
<para>
|
|
Another useful tool for monitoring database activity is the
|
|
<structname>pg_locks</structname> system table. It allows the
|
|
database administrator to view information about the outstanding
|
|
locks in the lock manager. For example, this capability can be used
|
|
to:
|
|
|
|
<itemizedlist>
|
|
<listitem>
|
|
<para>
|
|
View all the locks currently outstanding, all the locks on
|
|
relations in a particular database, all the locks on a
|
|
particular relation, or all the locks held by a particular
|
|
<productname>PostgreSQL</productname> session.
|
|
</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>
|
|
Determine the relation in the current database with the most
|
|
ungranted locks (which might be a source of contention among
|
|
database clients).
|
|
</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>
|
|
Determine the effect of lock contention on overall database
|
|
performance, as well as the extent to which contention varies
|
|
with overall database traffic.
|
|
</para>
|
|
</listitem>
|
|
</itemizedlist>
|
|
|
|
Details of the <structname>pg_locks</structname> view appear in
|
|
<xref linkend="view-pg-locks">.
|
|
For more information on locking and managing concurrency with
|
|
<productname>PostgreSQL</productname>, refer to <xref linkend="mvcc">.
|
|
</para>
|
|
</sect1>
|
|
</chapter>
|