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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/subtrans.c
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@ -22,7 +22,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/subtrans.c,v 1.18 2007/01/05 22:19:23 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/subtrans.c,v 1.19 2007/08/01 22:45:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -78,7 +78,7 @@ SubTransSetParent(TransactionId xid, TransactionId parent)
LWLockAcquire(SubtransControlLock, LW_EXCLUSIVE);
slotno = SimpleLruReadPage(SubTransCtl, pageno, xid);
slotno = SimpleLruReadPage(SubTransCtl, pageno, true, xid);
ptr = (TransactionId *) SubTransCtl->shared->page_buffer[slotno];
ptr += entryno;
@ -165,14 +165,14 @@ SubTransGetTopmostTransaction(TransactionId xid)
Size
SUBTRANSShmemSize(void)
{
return SimpleLruShmemSize(NUM_SUBTRANS_BUFFERS);
return SimpleLruShmemSize(NUM_SUBTRANS_BUFFERS, 0);
}
void
SUBTRANSShmemInit(void)
{
SubTransCtl->PagePrecedes = SubTransPagePrecedes;
SimpleLruInit(SubTransCtl, "SUBTRANS Ctl", NUM_SUBTRANS_BUFFERS,
SimpleLruInit(SubTransCtl, "SUBTRANS Ctl", NUM_SUBTRANS_BUFFERS, 0,
SubtransControlLock, "pg_subtrans");
/* Override default assumption that writes should be fsync'd */
SubTransCtl->do_fsync = false;