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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 02:37:32 +00:00
parent 95cacd1345
commit d8986332cb
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 1.305 2010/08/19 22:55:00 tgl Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.306 2010/08/22 02:37:32 momjian Exp $ -->
<chapter Id="runtime-config"> <chapter Id="runtime-config">
<title>Server Configuration</title> <title>Server Configuration</title>
@ -4150,7 +4150,8 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
<para> <para>
Specifies the maximum age (in transactions) that a table's Specifies the maximum age (in transactions) that a table's
<structname>pg_class</>.<structfield>relfrozenxid</> field can <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 transaction ID wraparound within the table. Note that the system
will launch autovacuum processes to prevent wraparound even when will launch autovacuum processes to prevent wraparound even when
autovacuum is otherwise disabled. autovacuum is otherwise disabled.