Move txid snapshot field description table from datatype to functions section.
This commit is contained in:
Bruce Momjian
parent
f5f375330e
commit
bd2ef63aa8
|
|
@ -1,4 +1,4 @@
|
|||
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.213 2007/11/05 14:51:08 momjian Exp $ -->
|
||||
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.214 2007/11/05 16:45:52 momjian Exp $ -->
|
||||
|
||||
<chapter id="datatype">
|
||||
<title id="datatype-title">Data Types</title>
|
||||
|
|
@ -3437,77 +3437,6 @@ SELECT to_tsquery('Fat:ab & Cats');
|
|||
|
||||
</sect1>
|
||||
|
||||
<sect1 id="datatype-txid-snapshot">
|
||||
<title>Transaction Snapshot Type</title>
|
||||
|
||||
<indexterm zone="datatype-txid-snapshot">
|
||||
<primary>txid_snapshot</primary>
|
||||
</indexterm>
|
||||
|
||||
<para>
|
||||
The data type <type>txid_snapshot</type> stores info about transaction ID
|
||||
visibility at a particular moment in time. The components are
|
||||
described in <xref linkend="datatype-txid-snapshot-parts">.
|
||||
</para>
|
||||
|
||||
<table id="datatype-txid-snapshot-parts">
|
||||
<title>Snapshot components</title>
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Name</entry>
|
||||
<entry>Query Function</entry>
|
||||
<entry>Description</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
|
||||
<row>
|
||||
<entry><type>xmin</type></entry>
|
||||
<entry>txid_snapshot_xmin()</entry>
|
||||
<entry>
|
||||
Earliest transaction ID that is still active. All earlier
|
||||
transactions will either be committed and visible, or rolled
|
||||
back and dead.
|
||||
</entry>
|
||||
</row>
|
||||
|
||||
<row>
|
||||
<entry><type>xmax</type></entry>
|
||||
<entry>txid_snapshot_xmax()</entry>
|
||||
<entry>
|
||||
Next unassigned txid. All txids later than this one are
|
||||
unassigned, and thus invisible.
|
||||
</entry>
|
||||
</row>
|
||||
|
||||
<row>
|
||||
<entry><type>xip_list</type></entry>
|
||||
<entry>txid_snapshot_xip()</entry>
|
||||
<entry>
|
||||
Active txids at the time of snapshot. All of them are between
|
||||
xmin and xmax. A txid that is <literal>xmin <= txid <
|
||||
xmax</literal> and not in this list is visible.
|
||||
</entry>
|
||||
</row>
|
||||
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
|
||||
<para>
|
||||
Snapshot's textual representation is <literal>[xmin]:[xmax]:[xip_list]</literal>
|
||||
for example <literal>10:20:10,14,15</literal> means
|
||||
<literal>xmin=10 xmax=20 xip_list=10,14,15</literal>.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Functions for getting and querying transaction ids and snapshots are
|
||||
described in <xref linkend="functions-txid">.
|
||||
</para>
|
||||
</sect1>
|
||||
|
||||
<sect1 id="datatype-uuid">
|
||||
<title><acronym>UUID</acronym> Type</title>
|
||||
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.407 2007/11/05 14:51:08 momjian Exp $ -->
|
||||
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.408 2007/11/05 16:45:52 momjian Exp $ -->
|
||||
|
||||
<chapter id="functions">
|
||||
<title>Functions and Operators</title>
|
||||
|
|
@ -11519,11 +11519,6 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
|
|||
<primary>txid_visible_in_snapshot</primary>
|
||||
</indexterm>
|
||||
|
||||
<para>
|
||||
The functions shown in <xref linkend="functions-txid-snapshot">
|
||||
export server internal transaction info to user level.
|
||||
</para>
|
||||
|
||||
<table id="functions-txid-snapshot">
|
||||
<title>Transaction IDs and snapshots</title>
|
||||
<tgroup cols="3">
|
||||
|
|
@ -11575,6 +11570,64 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
|
|||
which transactions were committed between two snapshots.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
The data type <type>txid_snapshot</type> stores info about transaction ID
|
||||
visibility at a particular moment in time. The components are
|
||||
described in <xref linkend="datatype-txid-snapshot-parts">.
|
||||
</para>
|
||||
|
||||
<table id="datatype-txid-snapshot-parts">
|
||||
<title>Snapshot components</title>
|
||||
<tgroup cols="2">
|
||||
<thead>
|
||||
<row>
|
||||
<entry>Name</entry>
|
||||
<entry>Query Function</entry>
|
||||
<entry>Description</entry>
|
||||
</row>
|
||||
</thead>
|
||||
|
||||
<tbody>
|
||||
|
||||
<row>
|
||||
<entry><type>xmin</type></entry>
|
||||
<entry>txid_snapshot_xmin()</entry>
|
||||
<entry>
|
||||
Earliest transaction ID that is still active. All earlier
|
||||
transactions will either be committed and visible, or rolled
|
||||
back and dead.
|
||||
</entry>
|
||||
</row>
|
||||
|
||||
<row>
|
||||
<entry><type>xmax</type></entry>
|
||||
<entry>txid_snapshot_xmax()</entry>
|
||||
<entry>
|
||||
Next unassigned txid. All txids later than this one are
|
||||
unassigned, and thus invisible.
|
||||
</entry>
|
||||
</row>
|
||||
|
||||
<row>
|
||||
<entry><type>xip_list</type></entry>
|
||||
<entry>txid_snapshot_xip()</entry>
|
||||
<entry>
|
||||
Active txids at the time of snapshot. All of them are between
|
||||
xmin and xmax. A txid that is <literal>xmin <= txid <
|
||||
xmax</literal> and not in this list is visible.
|
||||
</entry>
|
||||
</row>
|
||||
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table>
|
||||
|
||||
<para>
|
||||
Snapshot's textual representation is <literal>[xmin]:[xmax]:[xip_list]</literal>
|
||||
for example <literal>10:20:10,14,15</literal> means
|
||||
<literal>xmin=10 xmax=20 xip_list=10,14,15</literal>.
|
||||
</para>
|
||||
|
||||
</sect1>
|
||||
|
||||
<sect1 id="functions-admin">
|
||||
|
|
|
|||
Loading…
Reference in New Issue