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Clean up a couple of ad-hoc computations of the maximum number of tuples

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on a page, as suggested by ITAGAKI Takahiro.  Also, change a few places
that were using some other estimates of max-items-per-page to consistently
use MaxOffsetNumber.  This is conservatively large --- we could have used
the new MaxHeapTuplesPerPage macro, or a similar one for index tuples ---
but those places are simply declaring a fixed-size buffer and assuming it
will work, rather than actively testing for overrun.  It seems safer to
size these buffers in a way that can't overflow even if the page is
corrupt.
This commit is contained in:
Tom Lane
2005-09-02 19:02:20 +00:00
parent 962a4bb69f
commit 35e9b1cc1e
6 changed files with 25 additions and 18 deletions
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6
src/backend/access/gist/gistvacuum.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/gist/gistvacuum.c,v 1.6 2005/06/30 17:52:14 teodor Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.7 2005/09/02 19:02:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -52,7 +52,7 @@ gistVacuumUpdate( GistVacuum *gv, BlockNumber blkno, bool needunion ) {
int lenaddon=4, curlenaddon=0, ntodelete=0;
IndexTuple idxtuple, *addon=NULL;
bool needwrite=false;
OffsetNumber todelete[ BLCKSZ/SizeOfIptrData ];
OffsetNumber todelete[MaxOffsetNumber];
ItemPointerData *completed=NULL;
int ncompleted=0, lencompleted=16;
@ -439,7 +439,7 @@ gistbulkdelete(PG_FUNCTION_ARGS) {
page = (Page) BufferGetPage(buffer);
if ( GistPageIsLeaf(page) ) {
OffsetNumber todelete[BLCKSZ/SizeOfIptrData];
OffsetNumber todelete[MaxOffsetNumber];
int ntodelete = 0;
LockBuffer(buffer, GIST_UNLOCK);