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Improve cache invalidation handling. Eespecially

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this would fix TODO
* elog() flushes cache, try invalidating just entries from
  current xact, perhaps using invalidation cache
This commit is contained in:
Hiroshi Inoue
2000-01-10 06:30:56 +00:00
parent 5770935965
commit 0f2e7948e2
5 changed files with 476 additions and 51 deletions
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27
src/backend/storage/smgr/md.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.60 1999/11/16 04:13:56 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/smgr/md.c,v 1.61 2000/01/10 06:30:51 inoue Exp $
*
*-------------------------------------------------------------------------
*/
@@ -20,6 +20,7 @@
#include "catalog/catalog.h"
#include "miscadmin.h"
#include "storage/smgr.h"
#include "utils/inval.h" /* ImmediateSharedRelationCacheInvalidate() */
#undef DIAGNOSTIC
@@ -203,6 +204,15 @@ mdunlink(Relation reln)
*/
if (reln->rd_unlinked && reln->rd_fd < 0)
return SM_SUCCESS;
/*
* This call isn't good for independency of md stuff,but
* mdunlink() unlinks the base file immediately and couldn't
* be rollbacked in case of abort. We must guarantee all
* backends' relation cache invalidation here.
* This would be unnecessary if unlinking is postponed
* till end of transaction.
*/
ImmediateSharedRelationCacheInvalidate(reln);
/*
* Force all segments of the relation to be opened, so that we
* won't miss deleting any of them.
@@ -779,6 +789,7 @@ mdtruncate(Relation reln, int nblocks)
#ifndef LET_OS_MANAGE_FILESIZE
MemoryContext oldcxt;
int priorblocks;
bool invalregistered = false;
#endif
/* NOTE: mdnblocks makes sure we have opened all existing segments,
@@ -810,6 +821,20 @@ mdtruncate(Relation reln, int nblocks)
* a big file...
*/
FileTruncate(v->mdfd_vfd, 0);
/*
* To call ImmediateSharedRelationCacheInvalidate() here
* isn't good for independency of md stuff,but smgrunlink()
* removes the base file immediately and couldn't be
* rollbacked in case of abort. We must guarantee
* all backends' relation cache invalidation here.
* This would be unnecessary if the truncation is postponed
* till end of transaction.
*/
if (!invalregistered)
{
ImmediateSharedRelationCacheInvalidate(reln);
invalregistered = true;
}
FileUnlink(v->mdfd_vfd);
v = v->mdfd_chain;
Assert(ov != &Md_fdvec[fd]); /* we never drop the 1st segment */