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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2006-11-05 22:42:10 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2006-11-05 22:42:10 +0000 |
| commit | 48188e1621bb6711e7d092bee48523b18cd80177 (patch) | |
| tree | 524459ab58f8740a23efa7b7b521833646c678ba /src/backend/utils/misc/postgresql.conf.sample | |
| parent | 10c70b86023001dc6d9028737afc97850b86e58f (diff) | |
| download | postgresql-48188e1621bb6711e7d092bee48523b18cd80177.tar.gz postgresql-48188e1621bb6711e7d092bee48523b18cd80177.zip | |
Fix recently-understood problems with handling of XID freezing, particularly
in PITR scenarios. We now WAL-log the replacement of old XIDs with
FrozenTransactionId, so that such replacement is guaranteed to propagate to
PITR slave databases. Also, rather than relying on hint-bit updates to be
preserved, pg_clog is not truncated until all instances of an XID are known to
have been replaced by FrozenTransactionId. Add new GUC variables and
pg_autovacuum columns to allow management of the freezing policy, so that
users can trade off the size of pg_clog against the amount of freezing work
done. Revise the already-existing code that forces autovacuum of tables
approaching the wraparound point to make it more bulletproof; also, revise the
autovacuum logic so that anti-wraparound vacuuming is done per-table rather
than per-database. initdb forced because of changes in pg_class, pg_database,
and pg_autovacuum catalogs. Heikki Linnakangas, Simon Riggs, and Tom Lane.
Diffstat (limited to 'src/backend/utils/misc/postgresql.conf.sample')
| -rw-r--r-- | src/backend/utils/misc/postgresql.conf.sample | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample index 1d0e842bba0..3a0dedba672 100644 --- a/src/backend/utils/misc/postgresql.conf.sample +++ b/src/backend/utils/misc/postgresql.conf.sample @@ -373,6 +373,8 @@ # vacuum #autovacuum_analyze_scale_factor = 0.1 # fraction of rel size before # analyze +#autovacuum_freeze_max_age = 200000000 # maximum XID age before forced vacuum + # (change requires restart) #autovacuum_vacuum_cost_delay = -1 # default vacuum cost delay for # autovacuum, -1 means use # vacuum_cost_delay @@ -394,6 +396,7 @@ #default_transaction_isolation = 'read committed' #default_transaction_read_only = off #statement_timeout = 0 # 0 is disabled +#vacuum_freeze_min_age = 100000000 # - Locale and Formatting - |