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Change WAL-logging scheme for multixacts to be more like regular

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transaction IDs, rather than like subtrans; in particular, the information
now survives a database restart.  Per previous discussion, this is
essential for PITR log shipping and for 2PC.
This commit is contained in:
Tom Lane
2005-06-08 15:50:28 +00:00
parent 593badd30b
commit f5b2f60bd1
12 changed files with 560 additions and 274 deletions
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4
src/include/access/htup.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/htup.h,v 1.74 2005/04/28 21:47:17 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/htup.h,v 1.75 2005/06/08 15:50:27 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -505,6 +505,8 @@ typedef struct xl_heap_newpage
typedef struct xl_heap_lock
{
xl_heaptid target; /* locked tuple id */
TransactionId locking_xid; /* might be a MultiXactId not xid */
bool xid_is_mxact; /* is it? */
bool shared_lock; /* shared or exclusive row lock? */
} xl_heap_lock;

37
src/include/access/multixact.h
View File

@@ -6,16 +6,38 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/multixact.h,v 1.2 2005/05/03 19:42:41 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/multixact.h,v 1.3 2005/06/08 15:50:28 tgl Exp $
*/
#ifndef MULTIXACT_H
#define MULTIXACT_H
#include "access/xlog.h"
#define InvalidMultiXactId ((MultiXactId) 0)
#define FirstMultiXactId ((MultiXactId) 1)
#define MultiXactIdIsValid(multi) ((multi) != InvalidMultiXactId)
/* ----------------
* multixact-related XLOG entries
* ----------------
*/
#define XLOG_MULTIXACT_ZERO_OFF_PAGE 0x00
#define XLOG_MULTIXACT_ZERO_MEM_PAGE 0x10
#define XLOG_MULTIXACT_CREATE_ID 0x20
typedef struct xl_multixact_create
{
MultiXactId mid; /* new MultiXact's ID */
MultiXactOffset moff; /* its starting offset in members file */
int32 nxids; /* number of member XIDs */
TransactionId xids[1]; /* VARIABLE LENGTH ARRAY */
} xl_multixact_create;
#define MinSizeOfMultiXactCreate offsetof(xl_multixact_create, xids)
extern MultiXactId MultiXactIdCreate(TransactionId xid1, TransactionId xid2);
extern MultiXactId MultiXactIdExpand(MultiXactId multi, TransactionId xid);
extern bool MultiXactIdIsRunning(MultiXactId multi);
@@ -29,9 +51,16 @@ extern void MultiXactShmemInit(void);
extern void BootStrapMultiXact(void);
extern void StartupMultiXact(void);
extern void ShutdownMultiXact(void);
extern MultiXactId MultiXactGetCheckptMulti(bool is_shutdown);
extern void MultiXactGetCheckptMulti(bool is_shutdown,
MultiXactId *nextMulti,
MultiXactOffset *nextMultiOffset);
extern void CheckPointMultiXact(void);
extern void MultiXactSetNextMXact(MultiXactId nextMulti);
extern void MultiXactAdvanceNextMXact(MultiXactId minMulti);
extern void MultiXactSetNextMXact(MultiXactId nextMulti,
MultiXactOffset nextMultiOffset);
extern void MultiXactAdvanceNextMXact(MultiXactId minMulti,
MultiXactOffset minMultiOffset);
extern void multixact_redo(XLogRecPtr lsn, XLogRecord *record);
extern void multixact_desc(char *buf, uint8 xl_info, char *rec);
#endif /* MULTIXACT_H */

3
src/include/access/xlog.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.64 2005/06/06 20:22:58 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.65 2005/06/08 15:50:28 tgl Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -165,7 +165,6 @@ extern void ShutdownXLOG(int code, Datum arg);
extern void InitXLOGAccess(void);
extern void CreateCheckPoint(bool shutdown, bool force);
extern void XLogPutNextOid(Oid nextOid);
extern void XLogPutNextMultiXactId(MultiXactId multi);
extern XLogRecPtr GetRedoRecPtr(void);
#endif /* XLOG_H */