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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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7
src/include/access/transam.h
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@@ -7,13 +7,15 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/transam.h,v 1.60 2007/01/05 22:19:51 momjian Exp $
* $PostgreSQL: pgsql/src/include/access/transam.h,v 1.61 2007/08/01 22:45:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TRANSAM_H
#define TRANSAM_H
#include "access/xlogdefs.h"
/* ----------------
* Special transaction ID values
@@ -115,14 +117,17 @@ extern VariableCache ShmemVariableCache;
extern bool TransactionIdDidCommit(TransactionId transactionId);
extern bool TransactionIdDidAbort(TransactionId transactionId);
extern void TransactionIdCommit(TransactionId transactionId);
extern void TransactionIdAsyncCommit(TransactionId transactionId, XLogRecPtr lsn);
extern void TransactionIdAbort(TransactionId transactionId);
extern void TransactionIdSubCommit(TransactionId transactionId);
extern void TransactionIdCommitTree(int nxids, TransactionId *xids);
extern void TransactionIdAsyncCommitTree(int nxids, TransactionId *xids, XLogRecPtr lsn);
extern void TransactionIdAbortTree(int nxids, TransactionId *xids);
extern bool TransactionIdPrecedes(TransactionId id1, TransactionId id2);
extern bool TransactionIdPrecedesOrEquals(TransactionId id1, TransactionId id2);
extern bool TransactionIdFollows(TransactionId id1, TransactionId id2);
extern bool TransactionIdFollowsOrEquals(TransactionId id1, TransactionId id2);
extern XLogRecPtr TransactionIdGetCommitLSN(TransactionId xid);
/* in transam/varsup.c */
extern TransactionId GetNewTransactionId(bool isSubXact);