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Modify snapshot definition so that lazy vacuums are ignored by other

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vacuums.  This allows a OLTP-like system with big tables to continue
regular vacuuming on small-but-frequently-updated tables while the
big tables are being vacuumed.

Original patch from Hannu Krossing, rewritten by Tom Lane and updated
by me.
This commit is contained in:
Alvaro Herrera
2006-07-30 02:07:18 +00:00
parent d6603791ea
commit 92c2ecc130
9 changed files with 99 additions and 28 deletions
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3
src/backend/access/transam/twophase.c
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.21 2006/07/14 14:52:17 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.22 2006/07/30 02:07:18 alvherre Exp $
*
* NOTES
* Each global transaction is associated with a global transaction
@@ -279,6 +279,7 @@ MarkAsPreparing(TransactionId xid, const char *gid,
gxact->proc.pid = 0;
gxact->proc.databaseId = databaseid;
gxact->proc.roleId = owner;
gxact->proc.inVacuum = false;
gxact->proc.lwWaiting = false;
gxact->proc.lwExclusive = false;
gxact->proc.lwWaitLink = NULL;

5
src/backend/access/transam/xact.c
View File

@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.224 2006/07/24 16:32:44 petere Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.225 2006/07/30 02:07:18 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1529,6 +1529,7 @@ CommitTransaction(void)
LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
MyProc->xid = InvalidTransactionId;
MyProc->xmin = InvalidTransactionId;
MyProc->inVacuum = false; /* must be cleared with xid/xmin */
/* Clear the subtransaction-XID cache too while holding the lock */
MyProc->subxids.nxids = 0;
@@ -1764,6 +1765,7 @@ PrepareTransaction(void)
LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
MyProc->xid = InvalidTransactionId;
MyProc->xmin = InvalidTransactionId;
MyProc->inVacuum = false; /* must be cleared with xid/xmin */
/* Clear the subtransaction-XID cache too while holding the lock */
MyProc->subxids.nxids = 0;
@@ -1927,6 +1929,7 @@ AbortTransaction(void)
LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
MyProc->xid = InvalidTransactionId;
MyProc->xmin = InvalidTransactionId;
MyProc->inVacuum = false; /* must be cleared with xid/xmin */
/* Clear the subtransaction-XID cache too while holding the lock */
MyProc->subxids.nxids = 0;

4
src/backend/access/transam/xlog.c
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.244 2006/07/14 14:52:17 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.245 2006/07/30 02:07:18 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@@ -5413,7 +5413,7 @@ CreateCheckPoint(bool shutdown, bool force)
* StartupSUBTRANS hasn't been called yet.
*/
if (!InRecovery)
TruncateSUBTRANS(GetOldestXmin(true));
TruncateSUBTRANS(GetOldestXmin(true, false));
if (!shutdown)
ereport(DEBUG2,