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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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24
src/backend/access/transam/multixact.c
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@@ -42,7 +42,7 @@
* 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/multixact.c,v 1.23 2007/01/05 22:19:23 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/multixact.c,v 1.24 2007/08/01 22:45:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -749,7 +749,7 @@ RecordNewMultiXact(MultiXactId multi, MultiXactOffset offset,
* enough that a MultiXactId is really involved. Perhaps someday we'll
* take the trouble to generalize the slru.c error reporting code.
*/
slotno = SimpleLruReadPage(MultiXactOffsetCtl, pageno, multi);
slotno = SimpleLruReadPage(MultiXactOffsetCtl, pageno, true, multi);
offptr = (MultiXactOffset *) MultiXactOffsetCtl->shared->page_buffer[slotno];
offptr += entryno;
@@ -773,7 +773,7 @@ RecordNewMultiXact(MultiXactId multi, MultiXactOffset offset,
if (pageno != prev_pageno)
{
slotno = SimpleLruReadPage(MultiXactMemberCtl, pageno, multi);
slotno = SimpleLruReadPage(MultiXactMemberCtl, pageno, true, multi);
prev_pageno = pageno;
}
@@ -993,7 +993,7 @@ retry:
pageno = MultiXactIdToOffsetPage(multi);
entryno = MultiXactIdToOffsetEntry(multi);
slotno = SimpleLruReadPage(MultiXactOffsetCtl, pageno, multi);
slotno = SimpleLruReadPage(MultiXactOffsetCtl, pageno, true, multi);
offptr = (MultiXactOffset *) MultiXactOffsetCtl->shared->page_buffer[slotno];
offptr += entryno;
offset = *offptr;
@@ -1025,7 +1025,7 @@ retry:
entryno = MultiXactIdToOffsetEntry(tmpMXact);
if (pageno != prev_pageno)
slotno = SimpleLruReadPage(MultiXactOffsetCtl, pageno, tmpMXact);
slotno = SimpleLruReadPage(MultiXactOffsetCtl, pageno, true, tmpMXact);
offptr = (MultiXactOffset *) MultiXactOffsetCtl->shared->page_buffer[slotno];
offptr += entryno;
@@ -1061,7 +1061,7 @@ retry:
if (pageno != prev_pageno)
{
slotno = SimpleLruReadPage(MultiXactMemberCtl, pageno, multi);
slotno = SimpleLruReadPage(MultiXactMemberCtl, pageno, true, multi);
prev_pageno = pageno;
}
@@ -1289,8 +1289,8 @@ MultiXactShmemSize(void)
mul_size(sizeof(MultiXactId) * 2, MaxBackends))
size = SHARED_MULTIXACT_STATE_SIZE;
size = add_size(size, SimpleLruShmemSize(NUM_MXACTOFFSET_BUFFERS));
size = add_size(size, SimpleLruShmemSize(NUM_MXACTMEMBER_BUFFERS));
size = add_size(size, SimpleLruShmemSize(NUM_MXACTOFFSET_BUFFERS, 0));
size = add_size(size, SimpleLruShmemSize(NUM_MXACTMEMBER_BUFFERS, 0));
return size;
}
@@ -1306,10 +1306,10 @@ MultiXactShmemInit(void)
MultiXactMemberCtl->PagePrecedes = MultiXactMemberPagePrecedes;
SimpleLruInit(MultiXactOffsetCtl,
"MultiXactOffset Ctl", NUM_MXACTOFFSET_BUFFERS,
"MultiXactOffset Ctl", NUM_MXACTOFFSET_BUFFERS, 0,
MultiXactOffsetControlLock, "pg_multixact/offsets");
SimpleLruInit(MultiXactMemberCtl,
"MultiXactMember Ctl", NUM_MXACTMEMBER_BUFFERS,
"MultiXactMember Ctl", NUM_MXACTMEMBER_BUFFERS, 0,
MultiXactMemberControlLock, "pg_multixact/members");
/* Initialize our shared state struct */
@@ -1442,7 +1442,7 @@ StartupMultiXact(void)
int slotno;
MultiXactOffset *offptr;
slotno = SimpleLruReadPage(MultiXactOffsetCtl, pageno, multi);
slotno = SimpleLruReadPage(MultiXactOffsetCtl, pageno, true, multi);
offptr = (MultiXactOffset *) MultiXactOffsetCtl->shared->page_buffer[slotno];
offptr += entryno;
@@ -1472,7 +1472,7 @@ StartupMultiXact(void)
int slotno;
TransactionId *xidptr;
slotno = SimpleLruReadPage(MultiXactMemberCtl, pageno, offset);
slotno = SimpleLruReadPage(MultiXactMemberCtl, pageno, true, offset);
xidptr = (TransactionId *) MultiXactMemberCtl->shared->page_buffer[slotno];
xidptr += entryno;