Toggle navigation

vacuum_multixact_freeze_table_age

Type: integer
Default: 150000000
Min: 0
Max: 2000000000
Context: user
Restart: false
Since: 9.3

VACUUM performs an aggressive scan if the table's pg_class.relminmxid field has reached the age specified by this setting. An aggressive scan differs from a regular VACUUM in that it visits every page that might contain unfrozen XIDs or MXIDs, not just those that might contain dead tuples. The default is 150 million multixacts. Although users can set this value anywhere from zero to two billions, VACUUM will silently limit the effective value to 95% of autovacuum_multixact_freeze_max_age, so that a periodical manual VACUUM has a chance to run before an anti-wraparound is launched for the table. For more information see vacuum-for-multixact-wraparound.

Recommendations

Set to 80% of autovaccum_multixact_freeze_max_age

Comments