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Doc: Add relfrozenxid Tip to XID wraparound section.

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VACUUM VERBOSE and autovacuum log reports were taught to report the
details of how VACUUM advanced relfrozenxid (and relminmxid) by commit
872770fd.  Highlight this by adding a "Tip" to the documentation, next
to related discussion of age(relfrozenxid) monitoring.

Author: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAH2-Wzk0C1O-MKkOrj4YAfsGRru2=cA2VQpqM-9R1HNuG3nFaQ@mail.gmail.com
This commit is contained in:
Peter Geoghegan
2022-04-02 13:34:57 -07:00
parent e39f990467
commit 05023a237c
1 changed files with 13 additions and 0 deletions
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13
doc/src/sgml/maintenance.sgml
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@ -611,6 +611,19 @@ SELECT datname, age(datfrozenxid) FROM pg_database;
cutoff XID to the current transaction's XID.
</para>
<tip>
<para>
When the <command>VACUUM</command> command's <literal>VERBOSE</literal>
parameter is specified, <command>VACUUM</command> prints various
statistics about the table. This includes information about how
<structfield>relfrozenxid</structfield> and
<structfield>relminmxid</structfield> advanced. The same details appear
in the server log when autovacuum logging (controlled by <xref
linkend="guc-log-autovacuum-min-duration"/>) reports on a
<command>VACUUM</command> operation executed by autovacuum.
</para>
</tip>
<para>
<command>VACUUM</command> normally only scans pages that have been modified
since the last vacuum, but <structfield>relfrozenxid</structfield> can only be