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Replace hardcoded 200000000 with autovacuum_freeze_max_age

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Parts of the code used autovacuum_freeze_max_age to determine whether
anti-multixact-wraparound vacuums are necessary, while others used a
hardcoded 200000000 value.  This leads to problems when
autovacuum_freeze_max_age is set to a non-default value.  Use the latter
everywhere.

Backpatch to 9.3, where vacuuming of multixacts was introduced.

Andres Freund
This commit is contained in:
Alvaro Herrera 2013-11-28 16:45:29 -03:00
parent 79193c75f8
commit 76a31c689c
1 changed files with 10 additions and 2 deletions
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12
src/backend/access/transam/multixact.c
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@ -74,6 +74,7 @@
#include "funcapi.h"
#include "miscadmin.h"
#include "pg_trace.h"
#include "postmaster/autovacuum.h"
#include "storage/lmgr.h"
#include "storage/pmsignal.h"
#include "storage/procarray.h"
@ -1958,6 +1959,10 @@ SetMultiXactIdLimit(MultiXactId oldest_datminmxid, Oid oldest_datoid)
/*
* We'll refuse to continue assigning MultiXactIds once we get within 100
* multi of data loss.
*
* Note: This differs from the magic number used in
* SetTransactionIdLimit() since vacuum itself will never generate new
* multis.
*/
multiStopLimit = multiWrapLimit - 100;
if (multiStopLimit < FirstMultiXactId)
@ -1979,9 +1984,12 @@ SetMultiXactIdLimit(MultiXactId oldest_datminmxid, Oid oldest_datoid)
/*
* We'll start trying to force autovacuums when oldest_datminmxid gets to
* be more than 200 million transactions old.
* be more than autovacuum_freeze_max_age mxids old.
*
* It's a bit ugly to just reuse limits for xids that way, but it doesn't
* seem worth adding separate GUCs for that purpose.
*/
multiVacLimit = oldest_datminmxid + 200000000;
multiVacLimit = oldest_datminmxid + autovacuum_freeze_max_age;
if (multiVacLimit < FirstMultiXactId)
multiVacLimit += FirstMultiXactId;