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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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5
src/include/access/xact.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: xact.h,v 1.34 2001/07/12 04:11:13 tgl Exp $
* $Id: xact.h,v 1.35 2001/08/25 18:52:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -54,7 +54,6 @@ typedef TransactionStateData *TransactionState;
#define TRANS_INPROGRESS 2
#define TRANS_COMMIT 3
#define TRANS_ABORT 4
#define TRANS_DISABLED 5
/* ----------------
* transaction block states
@@ -100,7 +99,6 @@ extern int TransactionFlushEnabled(void);
extern void SetTransactionFlushEnabled(bool state);
extern bool IsAbortedTransactionBlockState(void);
extern void OverrideTransactionSystem(bool flag);
extern TransactionId GetCurrentTransactionId(void);
extern CommandId GetCurrentCommandId(void);
extern CommandId GetScanCommandId(void);
@@ -110,7 +108,6 @@ extern bool TransactionIdIsCurrentTransactionId(TransactionId xid);
extern bool CommandIdIsCurrentCommandId(CommandId cid);
extern bool CommandIdGEScanCommandId(CommandId cid);
extern void CommandCounterIncrement(void);
extern void InitializeTransactionSystem(void);
extern void StartTransactionCommand(void);
extern void CommitTransactionCommand(void);
extern void AbortCurrentTransaction(void);