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Document that autovacuum_freeze_max_age is used for pg_clog recycling.
We already mentioned xid wraparound.
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<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.305 2010/08/19 22:55:00 tgl Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.306 2010/08/22 02:37:32 momjian Exp $ -->
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<chapter Id="runtime-config">
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<title>Server Configuration</title>
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@ -4150,7 +4150,8 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
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<para>
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Specifies the maximum age (in transactions) that a table's
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<structname>pg_class</>.<structfield>relfrozenxid</> field can
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attain before a <command>VACUUM</> operation is forced to prevent
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attain before a <command>VACUUM</> operation is forced to allow removal
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of old files from the <filename>pg_clog</> subdirectory and prevent
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transaction ID wraparound within the table. Note that the system
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will launch autovacuum processes to prevent wraparound even when
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autovacuum is otherwise disabled.
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