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Improve documentation about pg_stat_replication view.

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Add the descriptions of possible values in "state" and "sync_state" columns
of pg_stat_replication view.

Author: Michael Paquier, slightly modified by me
Discussion: <CAB7nPqT7APWrvPFZrcjKEHoq4=g3z2ErxtTdojSf+sDALzuemA@mail.gmail.com>
This commit is contained in:
Fujii Masao 2016-12-06 17:09:10 +09:00
parent 3ebf2b4545
commit dfe530a092
2 changed files with 55 additions and 2 deletions
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6
doc/src/sgml/high-availability.sgml
View File

@ -1161,6 +1161,10 @@ synchronous_standby_names = '2 (s1, s2, s3)'
<literal>s2</> fails. <literal>s4</> is an asynchronous standby since
its name is not in the list.
</para>
<para>
The synchronous states of standby servers can be viewed using
the <structname>pg_stat_replication</structname> view.
</para>
</sect3>
<sect3 id="synchronous-replication-performance">
@ -1235,6 +1239,8 @@ synchronous_standby_names = '2 (s1, s2, s3)'
will increase according to the length of time the standby has been down.
The standby is only able to become a synchronous standby
once it has reached <literal>streaming</> state.
This state can be viewed using
the <structname>pg_stat_replication</structname> view.
</para>
<para>

51
doc/src/sgml/monitoring.sgml
View File

@ -1357,7 +1357,33 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
<row>
<entry><structfield>state</></entry>
<entry><type>text</></entry>
<entry>Current WAL sender state</entry>
<entry>Current WAL sender state.
Possible values are:
<itemizedlist>
<listitem>
<para>
<literal>startup</>: This WAL sender is starting up.
</para>
</listitem>
<listitem>
<para>
<literal>catchup</>: This WAL sender's connected standby is
catching up with the primary.
</para>
</listitem>
<listitem>
<para>
<literal>streaming</>: This WAL sender is streaming changes
after its connected standby server has caught up with the primary.
</para>
</listitem>
<listitem>
<para>
<literal>backup</>: This WAL sender is sending a backup.
</para>
</listitem>
</itemizedlist>
</entry>
</row>
<row>
<entry><structfield>sent_location</></entry>
@ -1391,7 +1417,28 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
<row>
<entry><structfield>sync_state</></entry>
<entry><type>text</></entry>
<entry>Synchronous state of this standby server</entry>
<entry>Synchronous state of this standby server.
Possible values are:
<itemizedlist>
<listitem>
<para>
<literal>async</>: This standby server is asynchronous.
</para>
</listitem>
<listitem>
<para>
<literal>potential</>: This standby server is now asynchronous,
but can potentially become synchronous if one of current
synchronous ones fails.
</para>
</listitem>
<listitem>
<para>
<literal>sync</>: This standby server is synchronous.
</para>
</listitem>
</itemizedlist>
</entry>
</row>
</tbody>
</tgroup>