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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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26
src/backend/commands/vacuumlazy.c
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@ -31,7 +31,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/vacuumlazy.c,v 1.4 2001/08/10 18:57:35 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/vacuumlazy.c,v 1.5 2001/08/26 16:55:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -94,7 +94,8 @@ typedef struct LVRelStats
static int MESSAGE_LEVEL; /* message level */
static TransactionId XmaxRecent;
static TransactionId OldestXmin;
static TransactionId FreezeLimit;
/* non-export function prototypes */
@ -143,7 +144,8 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt)
else
MESSAGE_LEVEL = DEBUG;
GetXmaxRecent(&XmaxRecent);
vacuum_set_xid_limits(vacstmt, onerel->rd_rel->relisshared,
&OldestXmin, &FreezeLimit);
vacrelstats = (LVRelStats *) palloc(sizeof(LVRelStats));
MemSet(vacrelstats, 0, sizeof(LVRelStats));
@ -307,12 +309,25 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
tupgone = false;
sv_infomask = tuple.t_data->t_infomask;
switch (HeapTupleSatisfiesVacuum(tuple.t_data, XmaxRecent))
switch (HeapTupleSatisfiesVacuum(tuple.t_data, OldestXmin))
{
case HEAPTUPLE_DEAD:
tupgone = true; /* we can delete the tuple */
break;
case HEAPTUPLE_LIVE:
/*
* Tuple is good. Consider whether to replace its xmin
* value with FrozenTransactionId.
*/
if (TransactionIdIsNormal(tuple.t_data->t_xmin) &&
TransactionIdPrecedes(tuple.t_data->t_xmin,
FreezeLimit))
{
tuple.t_data->t_xmin = FrozenTransactionId;
tuple.t_data->t_infomask &= ~HEAP_XMIN_INVALID;
tuple.t_data->t_infomask |= HEAP_XMIN_COMMITTED;
pgchanged = true;
}
break;
case HEAPTUPLE_RECENTLY_DEAD:
/*
@ -783,12 +798,13 @@ count_nondeletable_pages(Relation onerel, LVRelStats *vacrelstats)
tupgone = false;
sv_infomask = tuple.t_data->t_infomask;
switch (HeapTupleSatisfiesVacuum(tuple.t_data, XmaxRecent))
switch (HeapTupleSatisfiesVacuum(tuple.t_data, OldestXmin))
{
case HEAPTUPLE_DEAD:
tupgone = true; /* we can delete the tuple */
break;
case HEAPTUPLE_LIVE:
/* Shouldn't be necessary to re-freeze anything */
break;
case HEAPTUPLE_RECENTLY_DEAD:
/*