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Commitd9484ab

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Replace hardcoded 200000000 with autovacuum_freeze_max_age
Parts of the code used autovacuum_freeze_max_age to determine whetheranti-multixact-wraparound vacuums are necessary, while others used ahardcoded 200000000 value. This leads to problems whenautovacuum_freeze_max_age is set to a non-default value. Use the lattereverywhere.Backpatch to 9.3, where vacuuming of multixacts was introduced.Andres Freund
1 parenta9380b5 commitd9484ab

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‎src/backend/access/transam/multixact.c

Lines changed: 10 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -74,6 +74,7 @@
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#include"funcapi.h"
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#include"miscadmin.h"
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#include"pg_trace.h"
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#include"postmaster/autovacuum.h"
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#include"storage/lmgr.h"
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#include"storage/pmsignal.h"
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#include"storage/procarray.h"
@@ -1958,6 +1959,10 @@ SetMultiXactIdLimit(MultiXactId oldest_datminmxid, Oid oldest_datoid)
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/*
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* We'll refuse to continue assigning MultiXactIds once we get within 100
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* multi of data loss.
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*
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* Note: This differs from the magic number used in
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* SetTransactionIdLimit() since vacuum itself will never generate new
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* multis.
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*/
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multiStopLimit=multiWrapLimit-100;
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if (multiStopLimit<FirstMultiXactId)
@@ -1979,9 +1984,12 @@ SetMultiXactIdLimit(MultiXactId oldest_datminmxid, Oid oldest_datoid)
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/*
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* We'll start trying to force autovacuums when oldest_datminmxid gets to
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* be more than 200 million transactions old.
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* be more than autovacuum_freeze_max_age mxids old.
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*
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* It's a bit ugly to just reuse limits for xids that way, but it doesn't
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* seem worth adding separate GUCs for that purpose.
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*/
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multiVacLimit=oldest_datminmxid+200000000;
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multiVacLimit=oldest_datminmxid+autovacuum_freeze_max_age;
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if (multiVacLimit<FirstMultiXactId)
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multiVacLimit+=FirstMultiXactId;
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