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

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.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/include/access/xact.h b/src/include/access/xact.h
index 759eab1a3d9..e8e2b08de42 100644
--- a/src/include/access/xact.h
+++ b/src/include/access/xact.h
@@ -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);