database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-25 13:17:41 +03:00
Code Activity

Make the server track an 'XID epoch', that is, maintain higher-order bits

Browse Source 
of the transaction ID counter.  Nothing is done with the epoch except to
store it in checkpoint records, but this provides a foundation with which
add-on code can pretend that XIDs never wrap around.  This is a severely
trimmed and rewritten version of the xxid patch submitted by Marko Kreen.
Per discussion, the epoch counter seems the only part of xxid that really
needs to be in the core server.
This commit is contained in:
Tom Lane
2006-08-21 16:16:31 +00:00
parent 1054c38069
commit 35af5422f6
6 changed files with 177 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
src/include/access/xlog.h
View File

@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.73 2006/08/17 23:04:08 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.74 2006/08/21 16:16:31 tgl Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -166,5 +166,6 @@ extern void CreateCheckPoint(bool shutdown, bool force);
extern void XLogPutNextOid(Oid nextOid);
extern XLogRecPtr GetRedoRecPtr(void);
extern TransactionId GetRecentNextXid(void);
extern void GetNextXidAndEpoch(TransactionId *xid, uint32 *epoch);
#endif /* XLOG_H */