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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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5
src/backend/access/transam/xact.c
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@ -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;