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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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27
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
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtxlog.c,v 1.2 2003/02/23 06:17:13 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtxlog.c,v 1.3 2003/02/23 22:43:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -379,11 +379,10 @@ btree_xlog_delete(bool redo, XLogRecPtr lsn, XLogRecord *record)
return;
xlrec = (xl_btree_delete *) XLogRecGetData(record);
reln = XLogOpenRelation(redo, RM_BTREE_ID, xlrec->target.node);
reln = XLogOpenRelation(redo, RM_BTREE_ID, xlrec->node);
if (!RelationIsValid(reln))
return;
buffer = XLogReadBuffer(false, reln,
ItemPointerGetBlockNumber(&(xlrec->target.tid)));
buffer = XLogReadBuffer(false, reln, xlrec->block);
if (!BufferIsValid(buffer))
elog(PANIC, "btree_delete_redo: block unfound");
page = (Page) BufferGetPage(buffer);
@@ -396,7 +395,21 @@ btree_xlog_delete(bool redo, XLogRecPtr lsn, XLogRecord *record)
return;
}
PageIndexTupleDelete(page, ItemPointerGetOffsetNumber(&(xlrec->target.tid)));
if (record->xl_len > SizeOfBtreeDelete)
{
OffsetNumber *unused;
OffsetNumber *unend;
unused = (OffsetNumber *) ((char *) xlrec + SizeOfBtreeDelete);
unend = (OffsetNumber *) ((char *) xlrec + record->xl_len);
/* be careful to delete from back to front */
while (unused < unend)
{
unend--;
PageIndexTupleDelete(page, *unend);
}
}
PageSetLSN(page, lsn);
PageSetSUI(page, ThisStartUpID);
@@ -853,8 +866,8 @@ btree_desc(char *buf, uint8 xl_info, char *rec)
{
xl_btree_delete *xlrec = (xl_btree_delete *) rec;
strcat(buf, "delete: ");
out_target(buf, &(xlrec->target));
sprintf(buf + strlen(buf), "delete: node %u/%u; blk %u",
xlrec->node.tblNode, xlrec->node.relNode, xlrec->block);
break;
}
case XLOG_BTREE_DELETE_PAGE: