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| author | Bruce Momjian <bruce@momjian.us> | 2010-08-22 02:37:32 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2010-08-22 02:37:32 +0000 |
| commit | d8986332cb98d0463baacf87552c9059d28da731 (patch) | |
| tree | 71bcfd5e473abf544010a1552ff4893c471421d6 | |
| parent | 95cacd1345c4d1b00fe6cc7fff58c7391ce907d6 (diff) | |
| download | postgresql-d8986332cb98d0463baacf87552c9059d28da731.tar.gz postgresql-d8986332cb98d0463baacf87552c9059d28da731.zip | |
Document that autovacuum_freeze_max_age is used for pg_clog recycling.
We already mentioned xid wraparound.
| -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 d437727d335..8e91a744d71 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 1.305 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. |