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vacuumlazy.c: MultiXactIds are MXIDs, not XMIDs. 

Oversights in commits 0b018fab and f3c15cbe.
This commit is contained in:
Peter Geoghegan 2022-04-20 18:29:02 -07:00
parent 8ab0ebb9a8
commit ba6af6aa0b
1 changed files with 3 additions and 3 deletions
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6
src/backend/access/heap/vacuumlazy.c
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@ -512,7 +512,7 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
vacrel->FreezeLimit = FreezeLimit;
/* MultiXactCutoff controls MXID freezing (always <= OldestMxact) */
vacrel->MultiXactCutoff = MultiXactCutoff;
/* Initialize state used to track oldest extant XID/XMID */
/* Initialize state used to track oldest extant XID/MXID */
vacrel->NewRelfrozenXid = OldestXmin;
vacrel->NewRelminMxid = OldestMxact;
vacrel->skippedallvis = false;
@ -1295,7 +1295,7 @@ lazy_scan_heap(LVRelState *vacrel)
* Note: our opinion of which blocks can be skipped can go stale immediately.
* It's okay if caller "misses" a page whose all-visible or all-frozen marking
* was concurrently cleared, though. All that matters is that caller scan all
* pages whose tuples might contain XIDs < OldestXmin, or XMIDs < OldestMxact.
* pages whose tuples might contain XIDs < OldestXmin, or MXIDs < OldestMxact.
* (Actually, non-aggressive VACUUMs can choose to skip all-visible pages with
* older XIDs/MXIDs. The vacrel->skippedallvis flag will be set here when the
* choice to skip such a range is actually made, making everything safe.)
@ -2012,7 +2012,7 @@ lazy_scan_noprune(LVRelState *vacrel,
* relfrozenxid to a value >= FreezeLimit (and be able to
* advance rel's relminmxid to a value >= MultiXactCutoff).
* The ongoing aggressive VACUUM won't be able to do that
* unless it can freeze an XID (or XMID) from this tuple now.
* unless it can freeze an XID (or MXID) from this tuple now.
*
* The only safe option is to have caller perform processing
* of this page using lazy_scan_prune. Caller might have to