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Support an optional asynchronous commit mode, in which we don't flush WAL

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before reporting a transaction committed.  Data consistency is still
guaranteed (unlike setting fsync = off), but a crash may lose the effects
of the last few transactions.  Patch by Simon, some editorialization by Tom.
This commit is contained in:
Tom Lane
2007-08-01 22:45:09 +00:00
parent c722628a43
commit 4a78cdeb6b
25 changed files with 998 additions and 303 deletions
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5
src/include/access/xlog.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.81 2007/07/24 04:54:09 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.82 2007/08/01 22:45:09 tgl Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -197,8 +197,11 @@ extern CheckpointStatsData CheckpointStats;
extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info, XLogRecData *rdata);
extern void XLogFlush(XLogRecPtr RecPtr);
extern void XLogBackgroundFlush(void);
extern void XLogAsyncCommitFlush(void);
extern bool XLogNeedsFlush(XLogRecPtr RecPtr);
extern void XLogSetAsyncCommitLSN(XLogRecPtr record);
extern void xlog_redo(XLogRecPtr lsn, XLogRecord *record);
extern void xlog_desc(StringInfo buf, uint8 xl_info, char *rec);