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体验新版 GitCode,发现更多精彩内容 >>
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009d593c
编写于
7月 19, 2002
作者:
T
Tom Lane
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差异文件
Small performance improvement --- use indexscan not heapscan to find
pg_statistic rows to delete while dropping a relation.
上级
59a471fc
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
13 addition
and
8 deletion
+13
-8
src/backend/catalog/heap.c
src/backend/catalog/heap.c
+13
-8
未找到文件。
src/backend/catalog/heap.c
浏览文件 @
009d593c
...
...
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.21
0 2002/07/18 16:47:22
tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.21
1 2002/07/19 22:21:17
tgl Exp $
*
*
* INTERFACE ROUTINES
...
...
@@ -793,7 +793,8 @@ heap_create_with_catalog(const char *relname,
* Formerly, this routine checked for child relations and aborted the
* deletion if any were found. Now we rely on the dependency mechanism
* to check for or delete child relations. By the time we get here,
* there are no children and we need only remove the pg_inherits rows.
* there are no children and we need only remove any pg_inherits rows
* linking this relation to its parent(s).
*/
static
void
RelationRemoveInheritance
(
Relation
relation
)
...
...
@@ -1743,21 +1744,25 @@ static void
RemoveStatistics
(
Relation
rel
)
{
Relation
pgstatistic
;
Heap
ScanDesc
scan
;
Sys
ScanDesc
scan
;
ScanKeyData
key
;
HeapTuple
tuple
;
pgstatistic
=
heap_openr
(
StatisticRelationName
,
RowExclusiveLock
);
ScanKeyEntryInitialize
(
&
key
,
0x0
,
Anum_pg_statistic_starelid
,
F_OIDEQ
,
ScanKeyEntryInitialize
(
&
key
,
0x0
,
Anum_pg_statistic_starelid
,
F_OIDEQ
,
ObjectIdGetDatum
(
RelationGetRelid
(
rel
)));
scan
=
heap_beginscan
(
pgstatistic
,
SnapshotNow
,
1
,
&
key
);
while
((
tuple
=
heap_getnext
(
scan
,
ForwardScanDirection
))
!=
NULL
)
scan
=
systable_beginscan
(
pgstatistic
,
StatisticRelidAttnumIndex
,
true
,
SnapshotNow
,
1
,
&
key
);
while
(
HeapTupleIsValid
(
tuple
=
systable_getnext
(
scan
)))
{
simple_heap_delete
(
pgstatistic
,
&
tuple
->
t_self
);
}
heap
_endscan
(
scan
);
systable
_endscan
(
scan
);
heap_close
(
pgstatistic
,
RowExclusiveLock
);
}
...
...
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