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Replace implementation of pg_log as a relation accessed through the

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buffer manager with 'pg_clog', a specialized access method modeled
on pg_xlog.  This simplifies startup (don't need to play games to
open pg_log; among other things, OverrideTransactionSystem goes away),
should improve performance a little, and opens the door to recycling
commit log space by removing no-longer-needed segments of the commit
log.  Actual recycling is not there yet, but I felt I should commit
this part separately since it'd still be useful if we chose not to
do transaction ID wraparound.
This commit is contained in:
Tom Lane
2001-08-25 18:52:43 +00:00
parent 4699d81dc9
commit 2589735da0
39 changed files with 1248 additions and 1128 deletions
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38
src/backend/access/transam/xlogutils.c
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@ -6,24 +6,21 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlogutils.c,v 1.17 2001/08/23 23:06:37 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/transam/xlogutils.c,v 1.18 2001/08/25 18:52:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/xlog.h"
#include "access/transam.h"
#include "access/xact.h"
#include "storage/bufpage.h"
#include "storage/bufmgr.h"
#include "storage/smgr.h"
#include "access/htup.h"
#include "access/xlogutils.h"
#include "catalog/pg_database.h"
#include "lib/hasht.h"
#include "storage/bufpage.h"
#include "storage/smgr.h"
#include "utils/relcache.h"
/*
* ---------------------------------------------------------------
*
@ -152,33 +149,6 @@ XLogIsValidTuple(RelFileNode hnode, ItemPointer iptr)
return (true);
}
/*
* Open pg_log in recovery
*/
extern Relation LogRelation; /* pg_log relation */
void
XLogOpenLogRelation(void)
{
Relation logRelation;
Assert(!LogRelation);
logRelation = (Relation) malloc(sizeof(RelationData));
memset(logRelation, 0, sizeof(RelationData));
logRelation->rd_rel = (Form_pg_class) malloc(sizeof(FormData_pg_class));
memset(logRelation->rd_rel, 0, sizeof(FormData_pg_class));
sprintf(RelationGetPhysicalRelationName(logRelation), "pg_log");
logRelation->rd_node.tblNode = InvalidOid;
logRelation->rd_node.relNode = RelOid_pg_log;
logRelation->rd_targblock = InvalidBlockNumber;
logRelation->rd_fd = -1;
logRelation->rd_fd = smgropen(DEFAULT_SMGR, logRelation, false);
if (logRelation->rd_fd < 0)
elog(STOP, "XLogOpenLogRelation: failed to open pg_log");
LogRelation = logRelation;
}
/*
* ---------------------------------------------------------------
*