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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/include/access/heapam.h | |
| parent | 10c70b86023001dc6d9028737afc97850b86e58f (diff) | |
| download | postgresql-48188e1621bb6711e7d092bee48523b18cd80177.tar.gz | |
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have been replaced by FrozenTransactionId.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/include/access/heapam.h')
| -rw-r--r-- | src/include/access/heapam.h | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/include/access/heapam.h b/src/include/access/heapam.h index b2dd0f3390..4b3dd57534 100644 --- a/src/include/access/heapam.h +++ b/src/include/access/heapam.h @@ -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/access/heapam.h,v 1.116 2006/10/04 00:30:07 momjian Exp $ + * $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.117 2006/11/05 22:42:10 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -170,6 +170,8 @@ extern HTSU_Result heap_lock_tuple(Relation relation, HeapTuple tuple, TransactionId *update_xmax, CommandId cid, LockTupleMode mode, bool nowait); extern void heap_inplace_update(Relation relation, HeapTuple tuple); +extern bool heap_freeze_tuple(HeapTupleHeader tuple, TransactionId cutoff_xid, + Buffer buf); extern Oid simple_heap_insert(Relation relation, HeapTuple tup); extern void simple_heap_delete(Relation relation, ItemPointer tid); @@ -181,11 +183,17 @@ extern void heap_restrpos(HeapScanDesc scan); extern void heap_redo(XLogRecPtr lsn, XLogRecord *rptr); extern void heap_desc(StringInfo buf, uint8 xl_info, char *rec); -extern XLogRecPtr log_heap_clean(Relation reln, Buffer buffer, - OffsetNumber *unused, int uncnt); +extern void heap2_redo(XLogRecPtr lsn, XLogRecord *rptr); +extern void heap2_desc(StringInfo buf, uint8 xl_info, char *rec); + extern XLogRecPtr log_heap_move(Relation reln, Buffer oldbuf, ItemPointerData from, Buffer newbuf, HeapTuple newtup); +extern XLogRecPtr log_heap_clean(Relation reln, Buffer buffer, + OffsetNumber *unused, int uncnt); +extern XLogRecPtr log_heap_freeze(Relation reln, Buffer buffer, + TransactionId cutoff_xid, + OffsetNumber *offsets, int offcnt); /* in common/heaptuple.c */ extern Size heap_compute_data_size(TupleDesc tupleDesc, |