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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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6
src/include/access/xact.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.87 2007/04/30 21:01:53 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.88 2007/08/01 22:45:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -41,6 +41,9 @@ extern int XactIsoLevel;
extern bool DefaultXactReadOnly;
extern bool XactReadOnly;
/* Asynchronous commits */
extern bool XactSyncCommit;
/*
* start- and end-of-transaction callbacks for dynamically loaded modules
*/
@ -147,6 +150,7 @@ extern void SetCurrentStatementStartTimestamp(void);
extern int GetCurrentTransactionNestLevel(void);
extern bool TransactionIdIsCurrentTransactionId(TransactionId xid);
extern void CommandCounterIncrement(void);
extern void ForceSyncCommit(void);
extern void StartTransactionCommand(void);
extern void CommitTransactionCommand(void);
extern void AbortCurrentTransaction(void);