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Adjust btree index build to not use shared buffers, thereby avoiding the

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locking conflict against concurrent CHECKPOINT that was discussed a few
weeks ago.  Also, if not using WAL archiving (which is always true ATM
but won't be if PITR makes it into this release), there's no need to
WAL-log the index build process; it's sufficient to force-fsync the
completed index before commit.  This seems to gain about a factor of 2
in my tests, which is consistent with writing half as much data.  I did
not try it with WAL on a separate drive though --- probably the gain would
be a lot less in that scenario.
This commit is contained in:
Tom Lane
2004-06-02 17:28:18 +00:00
parent 4d0e47d5a9
commit 2095206de1
8 changed files with 304 additions and 214 deletions
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4
src/include/storage/smgr.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/smgr.h,v 1.43 2004/05/31 20:31:33 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.44 2004/06/02 17:28:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -63,6 +63,7 @@ extern void smgrwrite(SMgrRelation reln, BlockNumber blocknum, char *buffer,
extern BlockNumber smgrnblocks(SMgrRelation reln);
extern BlockNumber smgrtruncate(SMgrRelation reln, BlockNumber nblocks,
bool isTemp);
extern void smgrimmedsync(SMgrRelation reln);
extern void smgrDoPendingDeletes(bool isCommit);
extern int smgrGetPendingDeletes(bool forCommit, RelFileNode **ptr);
extern void smgrcommit(void);
@@ -89,6 +90,7 @@ extern bool mdwrite(SMgrRelation reln, BlockNumber blocknum, char *buffer,
extern BlockNumber mdnblocks(SMgrRelation reln);
extern BlockNumber mdtruncate(SMgrRelation reln, BlockNumber nblocks,
bool isTemp);
extern bool mdimmedsync(SMgrRelation reln);
extern bool mdsync(void);
extern void RememberFsyncRequest(RelFileNode rnode, BlockNumber segno);