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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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8
src/backend/access/transam/twophase.c
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.31 2007/05/27 03:50:39 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.32 2007/08/01 22:45:07 tgl Exp $
*
* NOTES
* Each global transaction is associated with a global transaction
@@ -1706,7 +1706,11 @@ RecordTransactionCommitPrepared(TransactionId xid,
XLOG_XACT_COMMIT_PREPARED | XLOG_NO_TRAN,
rdata);
/* we don't currently try to sleep before flush here ... */
/*
* We don't currently try to sleep before flush here ... nor is there
* any support for async commit of a prepared xact (the very idea is
* probably a contradiction)
*/
/* Flush XLOG to disk */
XLogFlush(recptr);