diff options
Diffstat (limited to 'src/backend/commands/vacuumlazy.c')
| -rw-r--r-- | src/backend/commands/vacuumlazy.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c index 20ce431e46c..f95346acdb5 100644 --- a/src/backend/commands/vacuumlazy.c +++ b/src/backend/commands/vacuumlazy.c @@ -467,6 +467,8 @@ lazy_scan_heap(Relation onerel, int options, LVRelStats *vacrelstats, blkno; HeapTupleData tuple; char *relname; + TransactionId relfrozenxid = onerel->rd_rel->relfrozenxid; + TransactionId relminmxid = onerel->rd_rel->relminmxid; BlockNumber empty_pages, vacuumed_pages; double num_tuples, @@ -1004,6 +1006,13 @@ lazy_scan_heap(Relation onerel, int options, LVRelStats *vacrelstats, * tuple, we choose to keep it, because it'll be a lot * cheaper to get rid of it in the next pruning pass than * to treat it like an indexed tuple. + * + * If this were to happen for a tuple that actually needed + * to be deleted, we'd be in trouble, because it'd + * possibly leave a tuple below the relation's xmin + * horizon alive. heap_prepare_freeze_tuple() is prepared + * to detect that case and abort the transaction, + * preventing corruption. */ if (HeapTupleIsHotUpdated(&tuple) || HeapTupleIsHeapOnly(&tuple)) @@ -1095,8 +1104,10 @@ lazy_scan_heap(Relation onerel, int options, LVRelStats *vacrelstats, * Each non-removable tuple must be checked to see if it needs * freezing. Note we already have exclusive buffer lock. */ - if (heap_prepare_freeze_tuple(tuple.t_data, FreezeLimit, - MultiXactCutoff, &frozen[nfrozen], + if (heap_prepare_freeze_tuple(tuple.t_data, + relfrozenxid, relminmxid, + FreezeLimit, MultiXactCutoff, + &frozen[nfrozen], &tuple_totally_frozen)) frozen[nfrozen++].offset = offnum; |