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Rewrite btree vacuuming to fold the former bulkdelete and cleanup operations

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into a single mostly-physical-order scan of the index.  This requires some
ticklish interlocking considerations, but should create no material
performance impact on normal index operations (at least given the
already-committed changes to make scans work a page at a time).  VACUUM
itself should get significantly faster in any index that's degenerated to a
very nonlinear page order.  Also, we save one pass over the index entirely,
except in the case where there were no deletions to do and so only one pass
happened anyway.

Original patch by Heikki Linnakangas, rework by Tom Lane.
This commit is contained in:
Tom Lane
2006-05-08 00:00:17 +00:00
parent 09cb5c0e7d
commit 5749f6ef0c
10 changed files with 692 additions and 253 deletions
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6
src/backend/access/nbtree/nbtxlog.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtxlog.c,v 1.32 2006/04/13 03:53:05 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtxlog.c,v 1.33 2006/05/08 00:00:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -249,6 +249,7 @@ btree_xlog_split(bool onleft, bool isroot,
pageop->btpo_next = rightsib;
pageop->btpo.level = xlrec->level;
pageop->btpo_flags = (xlrec->level == 0) ? BTP_LEAF : 0;
pageop->btpo_cycleid = 0;
_bt_restore_page(page,
(char *) xlrec + SizeOfBtreeSplit,
@ -281,6 +282,7 @@ btree_xlog_split(bool onleft, bool isroot,
pageop->btpo_next = xlrec->rightblk;
pageop->btpo.level = xlrec->level;
pageop->btpo_flags = (xlrec->level == 0) ? BTP_LEAF : 0;
pageop->btpo_cycleid = 0;
_bt_restore_page(page,
(char *) xlrec + SizeOfBtreeSplit + xlrec->leftlen,
@ -506,6 +508,7 @@ btree_xlog_delete_page(bool ismeta,
pageop->btpo_next = rightsib;
pageop->btpo.xact = FrozenTransactionId;
pageop->btpo_flags = BTP_DELETED;
pageop->btpo_cycleid = 0;
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
@ -548,6 +551,7 @@ btree_xlog_newroot(XLogRecPtr lsn, XLogRecord *record)
pageop->btpo.level = xlrec->level;
if (xlrec->level == 0)
pageop->btpo_flags |= BTP_LEAF;
pageop->btpo_cycleid = 0;
if (record->xl_len > SizeOfBtreeNewroot)
{