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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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10
src/backend/utils/init/flatfiles.c
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@ -23,7 +23,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.26 2007/06/12 17:16:52 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/flatfiles.c,v 1.27 2007/08/01 22:45:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -855,6 +855,14 @@ AtEOXact_UpdateFlatFiles(bool isCommit)
* Signal the postmaster to reload its caches.
*/
SendPostmasterSignal(PMSIGNAL_PASSWORD_CHANGE);
/*
* Force synchronous commit, to minimize the window between changing
* the flat files on-disk and marking the transaction committed. It's
* not great that there is any window at all, but definitely we don't
* want to make it larger than necessary.
*/
ForceSyncCommit();
}