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Get rid of rd_nblocks field in relcache entries. Turns out this was

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costing us lots more to maintain than it was worth.  On shared tables
it was of exactly zero benefit because we couldn't trust it to be
up to date.  On temp tables it sometimes saved an lseek, but not often
enough to be worth getting excited about.  And the real problem was that
we forced an lseek on every relcache flush in order to update the field.
So all in all it seems best to lose the complexity.
This commit is contained in:
Tom Lane
2004-05-08 19:09:25 +00:00
parent 1fe11fad54
commit 4af3421161
14 changed files with 79 additions and 162 deletions
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4
src/include/storage/bufmgr.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
*
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.78 2004/04/25 23:50:58 neilc Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.79 2004/05/08 19:09:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -156,7 +156,7 @@ extern void AtEOXact_Buffers(bool isCommit);
extern void FlushBufferPool(void);
extern BlockNumber BufferGetBlockNumber(Buffer buffer);
extern BlockNumber RelationGetNumberOfBlocks(Relation relation);
extern void RelationUpdateNumberOfBlocks(Relation relation);
extern void RelationTruncate(Relation rel, BlockNumber nblocks);
extern int FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock);
extern void DropRelationBuffers(Relation rel);
extern void DropRelFileNodeBuffers(RelFileNode rnode, bool istemp);