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Rewrite hashbulkdelete() to make it amenable to new bucket locking

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scheme.  A pleasant side effect is that it is *much* faster when deleting
a large fraction of the indexed tuples, because of elimination of
redundant hash_step activity induced by hash_adjscans.  Various other
continuing code cleanup.
This commit is contained in:
Tom Lane
2003-09-02 02:18:38 +00:00
parent 5f65345a57
commit 39673ca47b
6 changed files with 233 additions and 78 deletions
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13
src/include/access/hash.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: hash.h,v 1.50 2003/09/01 20:26:34 tgl Exp $
* $Id: hash.h,v 1.51 2003/09/02 02:18:38 tgl Exp $
*
* NOTES
* modeled after Margo Seltzer's hash implementation for unix.
@@ -25,13 +25,12 @@
/*
* Mapping from hash bucket number to physical block number of bucket's
* starting page. Beware of multiple evaluations of argument! Also notice
* macro's implicit dependency on "metap".
* starting page. Beware of multiple evaluations of argument!
*/
typedef uint32 Bucket;
#define BUCKET_TO_BLKNO(B) \
((BlockNumber) ((B) + ((B) ? metap->hashm_spares[_hash_log2((B)+1)-1] : 0)) + 1)
#define BUCKET_TO_BLKNO(metap,B) \
((BlockNumber) ((B) + ((B) ? (metap)->hashm_spares[_hash_log2((B)+1)-1] : 0)) + 1)
/*
* Special space for hash index pages.
@@ -243,8 +242,8 @@ extern Buffer _hash_addovflpage(Relation rel, Buffer metabuf, Buffer buf);
extern BlockNumber _hash_freeovflpage(Relation rel, Buffer ovflbuf);
extern void _hash_initbitmap(Relation rel, HashMetaPage metap,
BlockNumber blkno);
extern void _hash_squeezebucket(Relation rel, HashMetaPage metap,
Bucket bucket);
extern void _hash_squeezebucket(Relation rel,
Bucket bucket, BlockNumber bucket_blkno);
/* hashpage.c */
extern void _hash_metapinit(Relation rel);