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Adjust btbulkdelete logic so that only one WAL record is issued while

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deleting multiple index entries on a single index page.  This makes for
a very substantial reduction in the amount of WAL traffic during a
large delete operation.
This commit is contained in:
Tom Lane
2003-02-23 22:43:09 +00:00
parent 13dadef8b5
commit 3bbd6af37c
4 changed files with 135 additions and 107 deletions
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15
src/include/access/nbtree.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: nbtree.h,v 1.66 2003/02/23 06:17:13 tgl Exp $
* $Id: nbtree.h,v 1.67 2003/02/23 22:43:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -263,14 +263,18 @@ typedef struct xl_btree_split
#define SizeOfBtreeSplit (offsetof(xl_btree_split, leftlen) + sizeof(uint16))
/*
* This is what we need to know about delete of an individual leaf btitem
* This is what we need to know about delete of individual leaf btitems.
* The WAL record can represent deletion of any number of btitems on a
* single index page.
*/
typedef struct xl_btree_delete
{
xl_btreetid target; /* deleted tuple id */
RelFileNode node;
BlockNumber block;
/* TARGET OFFSET NUMBERS FOLLOW AT THE END */
} xl_btree_delete;
#define SizeOfBtreeDelete (offsetof(xl_btreetid, tid) + SizeOfIptrData)
#define SizeOfBtreeDelete (offsetof(xl_btree_delete, block) + sizeof(BlockNumber))
/*
* This is what we need to know about deletion of a btree page. The target
@ -453,7 +457,8 @@ extern void _bt_wrtnorelbuf(Relation rel, Buffer buf);
extern void _bt_pageinit(Page page, Size size);
extern bool _bt_page_recyclable(Page page);
extern void _bt_metaproot(Relation rel, BlockNumber rootbknum, uint32 level);
extern void _bt_itemdel(Relation rel, Buffer buf, ItemPointer tid);
extern void _bt_delitems(Relation rel, Buffer buf,
OffsetNumber *itemnos, int nitems);
extern int _bt_pagedel(Relation rel, Buffer buf, bool vacuum_full);
/*