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Modify btree to delete known-dead index entries without an actual VACUUM.

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When we are about to split an index page to do an insertion, first look
to see if any entries marked LP_DELETE exist on the page, and if so remove
them to try to make enough space for the desired insert.  This should reduce
index bloat in heavily-updated tables, although of course you still need
VACUUM eventually to clean up the heap.

Junji Teramoto
This commit is contained in:
Tom Lane
2006-07-25 19:13:00 +00:00
parent edd49fcf69
commit e6284649b9
6 changed files with 144 additions and 16 deletions
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10
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 1.35 2006/07/14 14:52:17 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtxlog.c,v 1.36 2006/07/25 19:13:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -346,6 +346,7 @@ btree_xlog_delete(XLogRecPtr lsn, XLogRecord *record)
Relation reln;
Buffer buffer;
Page page;
BTPageOpaque opaque;
if (record->xl_info & XLR_BKP_BLOCK_1)
return;
@ -374,6 +375,13 @@ btree_xlog_delete(XLogRecPtr lsn, XLogRecord *record)
PageIndexMultiDelete(page, unused, unend - unused);
}
/*
* Mark the page as not containing any LP_DELETE items --- see comments
* in _bt_delitems().
*/
opaque = (BTPageOpaque) PageGetSpecialPointer(page);
opaque->btpo_flags &= ~BTP_HAS_GARBAGE;
PageSetLSN(page, lsn);
PageSetTLI(page, ThisTimeLineID);
MarkBufferDirty(buffer);