database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-21 02:52:47 +03:00
Code Activity

Rearrange pg_subtrans handling as per recent discussion. pg_subtrans

Browse Source 
updates are no longer WAL-logged nor even fsync'd; we do not need to,
since after a crash no old pg_subtrans data is needed again.  We truncate
pg_subtrans to RecentGlobalXmin at each checkpoint.  slru.c's API is
refactored a little bit to separate out the necessary decisions.
This commit is contained in:
Tom Lane
2004-08-23 23:22:45 +00:00
parent 059912ce2e
commit 4dbb880d3c
13 changed files with 387 additions and 436 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
src/include/access/subtrans.h
View File

@@ -1,22 +1,16 @@
/*
* subtrans.h
*
* PostgreSQL subtrans-log manager
* PostgreSQL subtransaction-log manager
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/subtrans.h,v 1.2 2004/08/22 02:41:58 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/subtrans.h,v 1.3 2004/08/23 23:22:45 tgl Exp $
*/
#ifndef SUBTRANS_H
#define SUBTRANS_H
#include "access/xlog.h"
/* exported because lwlock.c needs it */
/* cannot be different from NUM_CLOG_BUFFERS without slru.c changes */
#define NUM_SUBTRANS_BUFFERS NUM_CLOG_BUFFERS
extern void SubTransSetParent(TransactionId xid, TransactionId parent);
extern TransactionId SubTransGetParent(TransactionId xid);
extern TransactionId SubTransGetTopmostTransaction(TransactionId xid);
@@ -29,6 +23,5 @@ extern void ShutdownSUBTRANS(void);
extern void CheckPointSUBTRANS(void);
extern void ExtendSUBTRANS(TransactionId newestXact);
extern void TruncateSUBTRANS(TransactionId oldestXact);
extern void subtrans_zeropage_redo(int pageno);
#endif /* SUBTRANS_H */