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Make non-MVCC snapshots exempt from predicate locking. Scans with non-MVCC

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snapshots, like in REINDEX, are basically non-transactional operations. The
DDL operation itself might participate in SSI, but there's separate
functions for that.

Kevin Grittner and Dan Ports, with some changes by me.
This commit is contained in:
Heikki Linnakangas
2011-06-15 11:43:05 +03:00
parent 707195c8f4
commit 0a0e2b52a5
6 changed files with 151 additions and 100 deletions
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15
src/backend/access/index/indexam.c
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@@ -126,7 +126,7 @@ do { \
} while(0)
static IndexScanDesc index_beginscan_internal(Relation indexRelation,
int nkeys, int norderbys);
int nkeys, int norderbys, Snapshot snapshot);
/* ----------------------------------------------------------------
@@ -234,7 +234,7 @@ index_beginscan(Relation heapRelation,
{
IndexScanDesc scan;
scan = index_beginscan_internal(indexRelation, nkeys, norderbys);
scan = index_beginscan_internal(indexRelation, nkeys, norderbys, snapshot);
/*
* Save additional parameters into the scandesc. Everything else was set
@@ -259,7 +259,7 @@ index_beginscan_bitmap(Relation indexRelation,
{
IndexScanDesc scan;
scan = index_beginscan_internal(indexRelation, nkeys, 0);
scan = index_beginscan_internal(indexRelation, nkeys, 0, snapshot);
/*
* Save additional parameters into the scandesc. Everything else was set
@@ -275,7 +275,7 @@ index_beginscan_bitmap(Relation indexRelation,
*/
static IndexScanDesc
index_beginscan_internal(Relation indexRelation,
int nkeys, int norderbys)
int nkeys, int norderbys, Snapshot snapshot)
{
IndexScanDesc scan;
FmgrInfo *procedure;
@@ -284,7 +284,7 @@ index_beginscan_internal(Relation indexRelation,
GET_REL_PROCEDURE(ambeginscan);
if (!(indexRelation->rd_am->ampredlocks))
PredicateLockRelation(indexRelation);
PredicateLockRelation(indexRelation, snapshot);
/*
* We hold a reference count to the relcache entry throughout the scan.
@@ -602,7 +602,8 @@ index_getnext(IndexScanDesc scan, ScanDirection direction)
scan->xs_cbuf);
CheckForSerializableConflictOut(valid, scan->heapRelation,
heapTuple, scan->xs_cbuf);
heapTuple, scan->xs_cbuf,
scan->xs_snapshot);
if (valid)
{
@@ -624,7 +625,7 @@ index_getnext(IndexScanDesc scan, ScanDirection direction)
else
scan->xs_next_hot = InvalidOffsetNumber;
PredicateLockTuple(scan->heapRelation, heapTuple);
PredicateLockTuple(scan->heapRelation, heapTuple, scan->xs_snapshot);
LockBuffer(scan->xs_cbuf, BUFFER_LOCK_UNLOCK);