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Document that autovacuum_freeze_max_age is used for pg_clog recycling. 

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">
<title>Server Configuration</title>
@ -4150,7 +4150,8 @@ 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.