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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have been replaced by FrozenTransactionId.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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10
src/include/commands/vacuum.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/vacuum.h,v 1.67 2006/07/13 18:01:02 momjian Exp $
* $PostgreSQL: pgsql/src/include/commands/vacuum.h,v 1.68 2006/11/05 22:42:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -104,8 +104,9 @@ typedef struct VacAttrStats
} VacAttrStats;
/* Default statistics target (GUC parameter) */
/* GUC parameters */
extern DLLIMPORT int default_statistics_target; /* DLLIMPORT for PostGIS */
extern int vacuum_freeze_min_age;
/* in commands/vacuum.c */
@@ -117,14 +118,13 @@ extern void vac_update_relstats(Oid relid,
BlockNumber num_pages,
double num_tuples,
bool hasindex,
TransactionId minxid,
TransactionId vacuumxid);
TransactionId frozenxid);
extern void vacuum_set_xid_limits(VacuumStmt *vacstmt, bool sharedRel,
TransactionId *oldestXmin,
TransactionId *freezeLimit);
extern void vac_update_datfrozenxid(void);
extern bool vac_is_partial_index(Relation indrel);
extern void vacuum_delay_point(void);
extern TransactionId vactuple_get_minxid(HeapTuple tuple);
/* in commands/vacuumlazy.c */
extern void lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt);