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Fix recently-understood problems with handling of XID freezing, particularly

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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have been replaced by FrozenTransactionId.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.
This commit is contained in:
Tom Lane
2006-11-05 22:42:10 +00:00
parent 10c70b8602
commit 48188e1621
43 changed files with 1284 additions and 1062 deletions
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12
src/backend/parser/gram.y
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@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.567 2006/10/13 21:43:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.568 2006/11/05 22:42:09 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -5158,7 +5158,7 @@ VacuumStmt: VACUUM opt_full opt_freeze opt_verbose
n->vacuum = true;
n->analyze = false;
n->full = $2;
n->freeze = $3;
n->freeze_min_age = $3 ? 0 : -1;
n->verbose = $4;
n->relation = NULL;
n->va_cols = NIL;
@ -5170,7 +5170,7 @@ VacuumStmt: VACUUM opt_full opt_freeze opt_verbose
n->vacuum = true;
n->analyze = false;
n->full = $2;
n->freeze = $3;
n->freeze_min_age = $3 ? 0 : -1;
n->verbose = $4;
n->relation = $5;
n->va_cols = NIL;
@ -5181,7 +5181,7 @@ VacuumStmt: VACUUM opt_full opt_freeze opt_verbose
VacuumStmt *n = (VacuumStmt *) $5;
n->vacuum = true;
n->full = $2;
n->freeze = $3;
n->freeze_min_age = $3 ? 0 : -1;
n->verbose |= $4;
$$ = (Node *)n;
}
@ -5194,7 +5194,7 @@ AnalyzeStmt:
n->vacuum = false;
n->analyze = true;
n->full = false;
n->freeze = false;
n->freeze_min_age = -1;
n->verbose = $2;
n->relation = NULL;
n->va_cols = NIL;
@ -5206,7 +5206,7 @@ AnalyzeStmt:
n->vacuum = false;
n->analyze = true;
n->full = false;
n->freeze = false;
n->freeze_min_age = -1;
n->verbose = $2;
n->relation = $3;
n->va_cols = $4;