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Transaction IDs wrap around, per my proposal of 13-Aug-01. More

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documentation to come, but the code is all here.  initdb forced.
This commit is contained in:
Tom Lane
2001-08-26 16:56:03 +00:00
parent d1ee78f296
commit bc7d37a525
29 changed files with 617 additions and 171 deletions
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10
src/backend/utils/time/tqual.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.41 2001/08/25 18:52:42 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.42 2001/08/26 16:56:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -592,8 +592,8 @@ HeapTupleSatisfiesSnapshot(HeapTupleHeader tuple, Snapshot snapshot)
* HeapTupleSatisfiesVacuum - determine tuple status for VACUUM and related
* operations
*
* XmaxRecent is a cutoff XID (obtained from GetXmaxRecent()). Tuples
* deleted by XIDs >= XmaxRecent are deemed "recently dead"; they might
* OldestXmin is a cutoff XID (obtained from GetOldestXmin()). Tuples
* deleted by XIDs >= OldestXmin are deemed "recently dead"; they might
* still be visible to some open transaction, so we can't remove them,
* even if we see that the deleting transaction has committed.
*
@@ -603,7 +603,7 @@ HeapTupleSatisfiesSnapshot(HeapTupleHeader tuple, Snapshot snapshot)
* change in t_infomask and scheduling a disk write if so.
*/
HTSV_Result
HeapTupleSatisfiesVacuum(HeapTupleHeader tuple, TransactionId XmaxRecent)
HeapTupleSatisfiesVacuum(HeapTupleHeader tuple, TransactionId OldestXmin)
{
/*
* Has inserting transaction committed?
@@ -712,7 +712,7 @@ HeapTupleSatisfiesVacuum(HeapTupleHeader tuple, TransactionId XmaxRecent)
return HEAPTUPLE_DEAD;
}
if (!TransactionIdPrecedes(tuple->t_xmax, XmaxRecent))
if (!TransactionIdPrecedes(tuple->t_xmax, OldestXmin))
{
/* deleting xact is too recent, tuple could still be visible */
return HEAPTUPLE_RECENTLY_DEAD;