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Document that autovacuum_freeze_max_age is used for pg_clog recycling.

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We already mentioned xid wraparound.
This commit is contained in:
Bruce Momjian
2010-08-22 02:37:38 +00:00
parent 0804734d91
commit 84d30267c5
1 changed files with 3 additions and 2 deletions
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doc/src/sgml/config.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.294.2.5 2010/08/19 22:55:09 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.294.2.6 2010/08/22 02:37:38 momjian Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@ -4117,7 +4117,8 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
<para>
Specifies the maximum age (in transactions) that a table's
<structname>pg_class</>.<structfield>relfrozenxid</> field can
attain before a <command>VACUUM</> operation is forced to prevent
attain before a <command>VACUUM</> operation is forced to allow removal
of old files from the <filename>pg_clog</> subdirectory and prevent
transaction ID wraparound within the table. Note that the system
will launch autovacuum processes to prevent wraparound even when
autovacuum is otherwise disabled.