diff options
| author | Bruce Momjian <bruce@momjian.us> | 2010-08-22 02:37:38 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2010-08-22 02:37:38 +0000 |
| commit | 84d30267c590ee5b82070dbc852dabf6369b507b (patch) | |
| tree | 7780568132b934c0d3dc05dba228775c0bf07573 /doc/src | |
| parent | 0804734d9144f5a6010e8f395542c11533b5a1c1 (diff) | |
Document that autovacuum_freeze_max_age is used for pg_clog recycling.
We already mentioned xid wraparound.
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/config.sgml | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 97d13305707..d4bf703998e 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -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. |