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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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4
src/include/access/nbtree.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/access/nbtree.h,v 1.101 2006/07/11 21:05:57 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.102 2006/07/25 19:13:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -71,6 +71,7 @@ typedef BTPageOpaqueData *BTPageOpaque;
#define BTP_META (1 << 3) /* meta-page */
#define BTP_HALF_DEAD (1 << 4) /* empty, but still in tree */
#define BTP_SPLIT_END (1 << 5) /* rightmost page of split group */
#define BTP_HAS_GARBAGE (1 << 6) /* page has LP_DELETEd tuples */
/*
@ -163,6 +164,7 @@ typedef struct BTMetaPageData
#define P_ISROOT(opaque) ((opaque)->btpo_flags & BTP_ROOT)
#define P_ISDELETED(opaque) ((opaque)->btpo_flags & BTP_DELETED)
#define P_IGNORE(opaque) ((opaque)->btpo_flags & (BTP_DELETED|BTP_HALF_DEAD))
#define P_HAS_GARBAGE(opaque) ((opaque)->btpo_flags & BTP_HAS_GARBAGE)
/*
* Lehman and Yao's algorithm requires a ``high key'' on every non-rightmost