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Temporary fix to make TOAST vacuum-safe. All values are forced to be

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in memory (plain or compressed) in the tuple returned from the heap-am.
So no index will ever contain an external reference.

Jan
This commit is contained in:
Jan Wieck
2000-07-21 10:31:31 +00:00
parent 9e85183bfc
commit 82f3945a67
3 changed files with 202 additions and 7 deletions
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43
src/backend/access/heap/heapam.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.79 2000/07/04 17:11:40 wieck Exp $
* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.80 2000/07/21 10:31:30 wieck Exp $
*
*
* INTERFACE ROUTINES
@ -1274,6 +1274,10 @@ Oid
heap_insert(Relation relation, HeapTuple tup)
{
Buffer buffer;
#ifndef TOAST_INDICES
HeapTupleHeader plaintdata = NULL;
int32 plaintlen = 0;
#endif
/* increment access statistics */
tup->tableOid = relation->rd_id;
@ -1309,7 +1313,11 @@ heap_insert(Relation relation, HeapTuple tup)
*/
if (HeapTupleHasExtended(tup) ||
(MAXALIGN(tup->t_len) > (MaxTupleSize / 4)))
#ifdef TOAST_INDICES
heap_tuple_toast_attrs(relation, tup, NULL);
#else
heap_tuple_toast_attrs(relation, tup, NULL, &plaintdata, &plaintlen);
#endif
#endif
/* Find buffer for this tuple */
@ -1347,6 +1355,16 @@ heap_insert(Relation relation, HeapTuple tup)
if (IsSystemRelationName(RelationGetRelationName(relation)))
RelationMark4RollbackHeapTuple(relation, tup);
#ifndef TOAST_INDICES
if (plaintdata != NULL && tup->t_data != plaintdata)
{
if (tup->t_datamcxt != NULL && (char *) (tup->t_data) !=
((char *) tup + HEAPTUPLESIZE))
pfree(tup->t_data);
tup->t_data = plaintdata;
tup->t_len = plaintlen;
}
#endif
return tup->t_data->t_oid;
}
@ -1461,7 +1479,11 @@ l1:
* ----------
*/
if (HeapTupleHasExtended(&tp))
#ifdef TOAST_INDICES
heap_tuple_toast_attrs(relation, NULL, &(tp));
#else
heap_tuple_toast_attrs(relation, NULL, &(tp), NULL, NULL);
#endif
#endif
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
@ -1486,6 +1508,10 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,
PageHeader dp;
Buffer buffer, newbuf;
int result;
#ifndef TOAST_INDICES
HeapTupleHeader plaintdata = NULL;
int32 plaintlen = 0;
#endif
newtup->tableOid = relation->rd_id;
/* increment access statistics */
@ -1574,7 +1600,11 @@ l2:
if (HeapTupleHasExtended(&oldtup) ||
HeapTupleHasExtended(newtup) ||
(MAXALIGN(newtup->t_len) > (MaxTupleSize / 4)))
#ifdef TOAST_INDICES
heap_tuple_toast_attrs(relation, newtup, &oldtup);
#else
heap_tuple_toast_attrs(relation, newtup, &oldtup, &plaintdata, &plaintlen);
#endif
#endif
/* Find buffer for new tuple */
@ -1637,6 +1667,17 @@ l2:
RelationInvalidateHeapTuple(relation, &oldtup);
RelationMark4RollbackHeapTuple(relation, newtup);
#ifndef TOAST_INDICES
if (plaintdata != NULL && newtup->t_data != plaintdata)
{
if (newtup->t_datamcxt != NULL && (char *) (newtup->t_data) !=
((char *) newtup + HEAPTUPLESIZE))
pfree(newtup->t_data);
newtup->t_data = plaintdata;
newtup->t_len = plaintlen;
}
#endif
return HeapTupleMayBeUpdated;
}