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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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4
src/backend/storage/buffer/README
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@@ -1,4 +1,4 @@
$Header: /cvsroot/pgsql/src/backend/storage/buffer/README,v 1.1 2001/07/06 21:04:25 tgl Exp $
$Header: /cvsroot/pgsql/src/backend/storage/buffer/README,v 1.2 2001/08/25 18:52:42 tgl Exp $
Notes about shared buffer access rules
--------------------------------------
@@ -66,7 +66,7 @@ at about the same time would OR the same bits into the field, so there
is little or no risk of conflicting update; what's more, if there did
manage to be a conflict it would merely mean that one bit-update would
be lost and need to be done again later. These four bits are only hints
(they cache the results of transaction status lookups in pg_log), so no
(they cache the results of transaction status lookups in pg_clog), so no
great harm is done if they get reset to zero by conflicting updates.
5. To physically remove a tuple or compact free space on a page, one

7
src/backend/storage/ipc/ipci.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipci.c,v 1.41 2001/06/27 23:31:39 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipci.c,v 1.42 2001/08/25 18:52:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -17,6 +17,7 @@
#include <sys/types.h>
#include "miscadmin.h"
#include "access/clog.h"
#include "access/xlog.h"
#include "storage/bufmgr.h"
#include "storage/freespace.h"
@@ -51,6 +52,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int maxBackends)
size = BufferShmemSize();
size += LockShmemSize(maxBackends);
size += XLOGShmemSize();
size += CLOGShmemSize();
size += SLockShmemSize();
size += SInvalShmemSize(maxBackends);
size += FreeSpaceShmemSize();
@@ -80,9 +82,10 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int maxBackends)
InitShmemAllocation(seghdr);
/*
* Set up xlog and buffers
* Set up xlog, clog, and buffers
*/
XLOGShmemInit();
CLOGShmemInit();
InitBufferPool();
/*

4
src/backend/storage/ipc/sinval.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.38 2001/08/23 23:06:37 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.39 2001/08/25 18:52:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -327,7 +327,7 @@ GetSnapshotData(bool serializable)
*--------------------
*/
ReadNewTransactionId(&(snapshot->xmax));
snapshot->xmax = ReadNewTransactionId();
for (index = 0; index < segP->lastBackend; index++)
{

4
src/backend/storage/lmgr/lmgr.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.49 2001/07/09 22:18:33 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lmgr.c,v 1.50 2001/08/25 18:52:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -373,7 +373,7 @@ XactLockTableWait(TransactionId xid)
/*
* Transaction was committed/aborted/crashed - we have to update
* pg_log if transaction is still marked as running.
* pg_clog if transaction is still marked as running.
*/
if (!TransactionIdDidCommit(xid) && !TransactionIdDidAbort(xid))
TransactionIdAbort(xid);