database/postgres
database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-04-24 10:47:04 +03:00
Code

Doc: Add relfrozenxid Tip to XID wraparound section.

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
doc/src/sgml/maintenance.sgml
View File

@ -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