database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-27 00:12:01 +03:00
Code Activity

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

Browse Source 
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have been replaced by FrozenTransactionId.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
Download Patch File Download Diff File Expand all files Collapse all files

14
src/include/access/heapam.h
View File

@@ -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,