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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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49
src/include/access/transam.h
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@@ -7,33 +7,30 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: transam.h,v 1.38 2001/08/23 23:06:38 tgl Exp $
* $Id: transam.h,v 1.39 2001/08/25 18:52:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TRANSAM_H
#define TRANSAM_H
#include "storage/bufmgr.h"
#include "storage/spin.h"
/* ----------------
* Special transaction ID values
*
* We do not use any transaction IDs less than 512 --- this leaves the first
* 128 bytes of pg_log available for special purposes such as version number
* storage. (Currently, we do not actually use them for anything.)
*
* BootstrapTransactionId is the XID for "bootstrap" operations. It should
* BootstrapTransactionId is the XID for "bootstrap" operations, and
* FrozenTransactionId is used for very old tuples. Both should
* always be considered valid.
*
* FirstNormalTransactionId is the first "normal" transaction id.
* ----------------
*/
#define InvalidTransactionId ((TransactionId) 0)
#define DisabledTransactionId ((TransactionId) 1)
#define BootstrapTransactionId ((TransactionId) 512)
#define FirstNormalTransactionId ((TransactionId) 514)
#define BootstrapTransactionId ((TransactionId) 1)
#define FrozenTransactionId ((TransactionId) 2)
#define FirstNormalTransactionId ((TransactionId) 3)
/* ----------------
* transaction ID manipulation macros
@@ -56,19 +53,6 @@
(dest) = FirstNormalTransactionId; \
} while(0)
/* ----------------
* transaction status values
*
* someday we will use "11" = 3 = XID_COMMIT_CHILD to mean the
* commiting of child xactions.
* ----------------
*/
#define XID_INPROGRESS 0 /* transaction in progress */
#define XID_ABORT 1 /* transaction aborted */
#define XID_COMMIT 2 /* transaction commited */
#define XID_COMMIT_CHILD 3 /* child xact commited */
typedef unsigned char XidStatus; /* (2 bits) */
/* ----------
* Object ID (OID) zero is InvalidOid.
@@ -116,25 +100,15 @@ typedef VariableCacheData *VariableCache;
/*
* prototypes for functions in transam/transam.c
*/
extern void InitializeTransactionLog(void);
extern void AmiTransactionOverride(bool flag);
extern bool TransactionIdDidCommit(TransactionId transactionId);
extern bool TransactionIdDidAbort(TransactionId transactionId);
extern void TransactionIdCommit(TransactionId transactionId);
extern void TransactionIdAbort(TransactionId transactionId);
/* in transam/transsup.c */
extern void AmiTransactionOverride(bool flag);
extern void TransComputeBlockNumber(Relation relation,
TransactionId transactionId, BlockNumber *blockNumberOutP);
extern XidStatus TransBlockNumberGetXidStatus(Relation relation,
BlockNumber blockNumber, TransactionId xid, bool *failP);
extern void TransBlockNumberSetXidStatus(Relation relation,
BlockNumber blockNumber, TransactionId xid, XidStatus xstatus,
bool *failP);
/* in transam/varsup.c */
extern void GetNewTransactionId(TransactionId *xid);
extern void ReadNewTransactionId(TransactionId *xid);
extern TransactionId GetNewTransactionId(void);
extern TransactionId ReadNewTransactionId(void);
extern Oid GetNewObjectId(void);
extern void CheckMaxObjectId(Oid assigned_oid);
@@ -143,9 +117,6 @@ extern void CheckMaxObjectId(Oid assigned_oid);
* ----------------
*/
/* in transam.c */
extern Relation LogRelation;
/* in xact.c */
extern bool AMI_OVERRIDE;