oracle谓词推进测试
2015-11-04 16:19
531 查看
可合并视图，不可合并视图，谓词推进测试
create table t3 as select * from dba_tables;
create table t4 as select * from dba_users;
create table t5 as select * from dba_objects;
对于没有外连接的测试
SQL> select * from (select * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner=t5.owner and v.table_name=t5.object_name;
已选择1917行。
执行计划
----------------------------------------------------------
Plan hash value: 2774782749
-------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
-------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1683 | 4805K| | 1126 (1)| 00:00:14 |
| 1 | SORT ORDER BY | | 1683 | 4805K| 6744K| 1126 (1)| 00:00:14 |
|* 2 | HASH JOIN | | 1683 | 4805K| | 97 (2)| 00:00:02 |
| 3 | TABLE ACCESS FULL | T4 | 18 | 39168 | | 3 (0)| 00:00:01 |
|* 4 | HASH JOIN | | 1683 | 1229K| | 94 (2)| 00:00:02 |
| 5 | TABLE ACCESS FULL| T3 | 1683 | 889K| | 20 (0)| 00:00:01 |
| 6 | TABLE ACCESS FULL| T5 | 21334 | 4312K| | 73 (0)| 00:00:01 |
-------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("T3"."OWNER"="T4"."USERNAME")
4 - access("T3"."OWNER"="T5"."OWNER" AND
"T3"."TABLE_NAME"="T5"."OBJECT_NAME")
Note
-----
- dynamic sampling used for this statement (level=2)
对于左外连接的测试
select * from (select * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner=t5.owner(+) and v.table_name=t5.object_name(+);
执行计划
----------------------------------------------------------
Plan hash value: 165444085
-------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
-------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1683 | 4805K| | 1126 (1)| 00:00:14 |
| 1 | SORT ORDER BY | | 1683 | 4805K| 6744K| 1126 (1)| 00:00:14 |
|* 2 | HASH JOIN | | 1683 | 4805K| | 97 (2)| 00:00:02 |
| 3 | TABLE ACCESS FULL | T4 | 18 | 39168 | | 3 (0)| 00:00:01 |
|* 4 | HASH JOIN OUTER | | 1683 | 1229K| | 94 (2)| 00:00:02 |
| 5 | TABLE ACCESS FULL| T3 | 1683 | 889K| | 20 (0)| 00:00:01 |
| 6 | TABLE ACCESS FULL| T5 | 21334 | 4312K| | 73 (0)| 00:00:01 |
-------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("T3"."OWNER"="T4"."USERNAME")
4 - access("T3"."OWNER"="T5"."OWNER"(+) AND
"T3"."TABLE_NAME"="T5"."OBJECT_NAME"(+))
Note
-----
- dynamic sampling used for this statement (level=2)
对于右外连接的测试
SQL> select * from (select * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner(+)=t5.owner and v.table_name(+)=t5.object_name;
已选择18515行。
执行计划
----------------------------------------------------------
Plan hash value: 3366092662
--------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
--------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 21334 | 59M| | 1492 (1)| 00:00:18 |
|* 1 | HASH JOIN RIGHT OUTER| | 21334 | 59M| 4488K| 1492 (1)| 00:00:18 |
| 2 | VIEW | | 1683 | 4465K| | 979 (1)| 00:00:12 |
| 3 | SORT ORDER BY | | 1683 | 4465K| 6744K| 979 (1)| 00:00:12 |
|* 4 | HASH JOIN | | 1683 | 4465K| | 24 (5)| 00:00:01 |
| 5 | TABLE ACCESS FULL| T4 | 18 | 39168 | | 3 (0)| 00:00:01 |
| 6 | TABLE ACCESS FULL| T3 | 1683 | 889K| | 20 (0)| 00:00:01 |
| 7 | TABLE ACCESS FULL | T5 | 21334 | 4312K| | 73 (0)| 00:00:01 |
--------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("V"."OWNER"(+)="T5"."OWNER" AND
"V"."TABLE_NAME"(+)="T5"."OBJECT_NAME")
4 - access("T3"."OWNER"="T4"."USERNAME")
Note
-----
- dynamic sampling used for this statement (level=2)
看到对于右外连接的这种情况，视图没有合并
对于rownum伪劣的情况
SQL> select * from (select * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner=t5.owner and v.table_name=t5.object_name and rownum<1
0;
已选择9行。
执行计划
----------------------------------------------------------
Plan hash value: 87499378
---------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
---------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 9 | 26316 | | 649 (1)| 00:00:08 |
|* 1 | COUNT STOPKEY | | | | | | |
| 2 | NESTED LOOPS | | 9 | 26316 | | 649 (1)| 00:00:08 |
| 3 | VIEW | | 1683 | 4465K| | 6 (0)| 00:00:01 |
| 4 | SORT ORDER BY | | 1683 | 4465K| 6744K| 979 (1)| 00:00:12 |
|* 5 | HASH JOIN | | 1683 | 4465K| | 24 (5)| 00:00:01 |
| 6 | TABLE ACCESS FULL| T4 | 18 | 39168 | | 3 (0)| 00:00:01 |
| 7 | TABLE ACCESS FULL| T3 | 1683 | 889K| | 20 (0)| 00:00:01 |
|* 8 | TABLE ACCESS FULL | T5 | 1 | 207 | | 71 (0)| 00:00:01 |
---------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter(ROWNUM<10)
5 - access("T3"."OWNER"="T4"."USERNAME")
8 - filter("V"."OWNER"="T5"."OWNER" AND "V"."TABLE_NAME"="T5"."OBJECT_NAME")
Note
-----
- dynamic sampling used for this statement (level=2)
看到在不包含外连接的情况下，在有伪劣的情况下，视图也是没有合并的。
-----在视图无法合并的情况下使用push_pred，进行谓词推进
SQL> select * from (select /*+push_pred*/ * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner(+)=t5.owner and v.table_name(+)=t5.obj
ect_name and rownum<=10;
已选择10行。
执行计划
----------------------------------------------------------
Plan hash value: 857520502
---------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 10 | 29090 | 501K (3)| 01:40:23 |
|* 1 | COUNT STOPKEY | | | | | |
| 2 | NESTED LOOPS OUTER | | 21334 | 59M| 501K (3)| 01:40:23 |
| 3 | TABLE ACCESS FULL | T5 | 21334 | 4312K| 2 (0)| 00:00:01 |
| 4 | VIEW PUSHED PREDICATE | | 1 | 2702 | 24 (5)| 00:00:01 |
|* 5 | HASH JOIN | | 1 | 2717 | 24 (5)| 00:00:01 |
|* 6 | TABLE ACCESS FULL | T4 | 1 | 2176 | 3 (0)| 00:00:01 |
|* 7 | TABLE ACCESS FULL | T3 | 1 | 541 | 20 (0)| 00:00:01 |
---------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter(ROWNUM<=10)
5 - access("T3"."OWNER"="T4"."USERNAME")
6 - filter("T4"."USERNAME"="T5"."OWNER")
7 - filter("T3"."TABLE_NAME"="T5"."OBJECT_NAME" AND
"T3"."OWNER"="T5"."OWNER")
Note
-----
- dynamic sampling used for this statement (level=2)
SQL> select * from (select /*+push_pred*/ * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner(+)=t5.owner and v.table_name(+)=t5.obj
ect_name;
已选择18515行。
执行计划
----------------------------------------------------------
Plan hash value: 1963531859
--------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 21334 | 59M| 501K (3)| 01:40:24 |
| 1 | NESTED LOOPS OUTER | | 21334 | 59M| 501K (3)| 01:40:24 |
| 2 | TABLE ACCESS FULL | T5 | 21334 | 4312K| 73 (0)| 00:00:01 |
| 3 | VIEW PUSHED PREDICATE | | 1 | 2702 | 24 (5)| 00:00:01 |
|* 4 | HASH JOIN | | 1 | 2717 | 24 (5)| 00:00:01 |
|* 5 | TABLE ACCESS FULL | T4 | 1 | 2176 | 3 (0)| 00:00:01 |
|* 6 | TABLE ACCESS FULL | T3 | 1 | 541 | 20 (0)| 00:00:01 |
--------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("T3"."OWNER"="T4"."USERNAME")
5 - filter("T4"."USERNAME"="T5"."OWNER")
6 - filter("T3"."TABLE_NAME"="T5"."OBJECT_NAME" AND
"T3"."OWNER"="T5"."OWNER")
Note
-----
- dynamic sampling used for this statement (level=2)
-----在不包含外连接的情况下，即时有rownum伪劣，也是无法谓词推进的
SQL> select * from (select /*+push_pred*/ * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner=t5.owner and v.table_name=t5.object_na
me and rownum<=10;
已选择10行。
执行计划
----------------------------------------------------------
Plan hash value: 87499378
---------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
---------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 10 | 29240 | | 792 (1)| 00:00:10 |
|* 1 | COUNT STOPKEY | | | | | | |
| 2 | NESTED LOOPS | | 11 | 32164 | | 792 (1)| 00:00:10 |
| 3 | VIEW | | 1683 | 4465K| | 7 (0)| 00:00:01 |
| 4 | SORT ORDER BY | | 1683 | 4465K| 6744K| 979 (1)| 00:00:12 |
|* 5 | HASH JOIN | | 1683 | 4465K| | 24 (5)| 00:00:01 |
| 6 | TABLE ACCESS FULL| T4 | 18 | 39168 | | 3 (0)| 00:00:01 |
| 7 | TABLE ACCESS FULL| T3 | 1683 | 889K| | 20 (0)| 00:00:01 |
|* 8 | TABLE ACCESS FULL | T5 | 1 | 207 | | 71 (0)| 00:00:01 |
---------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter(ROWNUM<=10)
5 - access("T3"."OWNER"="T4"."USERNAME")
8 - filter("V"."OWNER"="T5"."OWNER" AND "V"."TABLE_NAME"="T5"."OBJECT_NAME")
Note
create table t3 as select * from dba_tables;
create table t4 as select * from dba_users;
create table t5 as select * from dba_objects;
对于没有外连接的测试
SQL> select * from (select * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner=t5.owner and v.table_name=t5.object_name;
已选择1917行。
执行计划
----------------------------------------------------------
Plan hash value: 2774782749
-------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
-------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1683 | 4805K| | 1126 (1)| 00:00:14 |
| 1 | SORT ORDER BY | | 1683 | 4805K| 6744K| 1126 (1)| 00:00:14 |
|* 2 | HASH JOIN | | 1683 | 4805K| | 97 (2)| 00:00:02 |
| 3 | TABLE ACCESS FULL | T4 | 18 | 39168 | | 3 (0)| 00:00:01 |
|* 4 | HASH JOIN | | 1683 | 1229K| | 94 (2)| 00:00:02 |
| 5 | TABLE ACCESS FULL| T3 | 1683 | 889K| | 20 (0)| 00:00:01 |
| 6 | TABLE ACCESS FULL| T5 | 21334 | 4312K| | 73 (0)| 00:00:01 |
-------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("T3"."OWNER"="T4"."USERNAME")
4 - access("T3"."OWNER"="T5"."OWNER" AND
"T3"."TABLE_NAME"="T5"."OBJECT_NAME")
Note
-----
- dynamic sampling used for this statement (level=2)
对于左外连接的测试
select * from (select * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner=t5.owner(+) and v.table_name=t5.object_name(+);
执行计划
----------------------------------------------------------
Plan hash value: 165444085
-------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
-------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1683 | 4805K| | 1126 (1)| 00:00:14 |
| 1 | SORT ORDER BY | | 1683 | 4805K| 6744K| 1126 (1)| 00:00:14 |
|* 2 | HASH JOIN | | 1683 | 4805K| | 97 (2)| 00:00:02 |
| 3 | TABLE ACCESS FULL | T4 | 18 | 39168 | | 3 (0)| 00:00:01 |
|* 4 | HASH JOIN OUTER | | 1683 | 1229K| | 94 (2)| 00:00:02 |
| 5 | TABLE ACCESS FULL| T3 | 1683 | 889K| | 20 (0)| 00:00:01 |
| 6 | TABLE ACCESS FULL| T5 | 21334 | 4312K| | 73 (0)| 00:00:01 |
-------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("T3"."OWNER"="T4"."USERNAME")
4 - access("T3"."OWNER"="T5"."OWNER"(+) AND
"T3"."TABLE_NAME"="T5"."OBJECT_NAME"(+))
Note
-----
- dynamic sampling used for this statement (level=2)
对于右外连接的测试
SQL> select * from (select * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner(+)=t5.owner and v.table_name(+)=t5.object_name;
已选择18515行。
执行计划
----------------------------------------------------------
Plan hash value: 3366092662
--------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
--------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 21334 | 59M| | 1492 (1)| 00:00:18 |
|* 1 | HASH JOIN RIGHT OUTER| | 21334 | 59M| 4488K| 1492 (1)| 00:00:18 |
| 2 | VIEW | | 1683 | 4465K| | 979 (1)| 00:00:12 |
| 3 | SORT ORDER BY | | 1683 | 4465K| 6744K| 979 (1)| 00:00:12 |
|* 4 | HASH JOIN | | 1683 | 4465K| | 24 (5)| 00:00:01 |
| 5 | TABLE ACCESS FULL| T4 | 18 | 39168 | | 3 (0)| 00:00:01 |
| 6 | TABLE ACCESS FULL| T3 | 1683 | 889K| | 20 (0)| 00:00:01 |
| 7 | TABLE ACCESS FULL | T5 | 21334 | 4312K| | 73 (0)| 00:00:01 |
--------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("V"."OWNER"(+)="T5"."OWNER" AND
"V"."TABLE_NAME"(+)="T5"."OBJECT_NAME")
4 - access("T3"."OWNER"="T4"."USERNAME")
Note
-----
- dynamic sampling used for this statement (level=2)
看到对于右外连接的这种情况，视图没有合并
对于rownum伪劣的情况
SQL> select * from (select * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner=t5.owner and v.table_name=t5.object_name and rownum<1
0;
已选择9行。
执行计划
----------------------------------------------------------
Plan hash value: 87499378
---------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
---------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 9 | 26316 | | 649 (1)| 00:00:08 |
|* 1 | COUNT STOPKEY | | | | | | |
| 2 | NESTED LOOPS | | 9 | 26316 | | 649 (1)| 00:00:08 |
| 3 | VIEW | | 1683 | 4465K| | 6 (0)| 00:00:01 |
| 4 | SORT ORDER BY | | 1683 | 4465K| 6744K| 979 (1)| 00:00:12 |
|* 5 | HASH JOIN | | 1683 | 4465K| | 24 (5)| 00:00:01 |
| 6 | TABLE ACCESS FULL| T4 | 18 | 39168 | | 3 (0)| 00:00:01 |
| 7 | TABLE ACCESS FULL| T3 | 1683 | 889K| | 20 (0)| 00:00:01 |
|* 8 | TABLE ACCESS FULL | T5 | 1 | 207 | | 71 (0)| 00:00:01 |
---------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter(ROWNUM<10)
5 - access("T3"."OWNER"="T4"."USERNAME")
8 - filter("V"."OWNER"="T5"."OWNER" AND "V"."TABLE_NAME"="T5"."OBJECT_NAME")
Note
-----
- dynamic sampling used for this statement (level=2)
看到在不包含外连接的情况下，在有伪劣的情况下，视图也是没有合并的。
-----在视图无法合并的情况下使用push_pred，进行谓词推进
SQL> select * from (select /*+push_pred*/ * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner(+)=t5.owner and v.table_name(+)=t5.obj
ect_name and rownum<=10;
已选择10行。
执行计划
----------------------------------------------------------
Plan hash value: 857520502
---------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 10 | 29090 | 501K (3)| 01:40:23 |
|* 1 | COUNT STOPKEY | | | | | |
| 2 | NESTED LOOPS OUTER | | 21334 | 59M| 501K (3)| 01:40:23 |
| 3 | TABLE ACCESS FULL | T5 | 21334 | 4312K| 2 (0)| 00:00:01 |
| 4 | VIEW PUSHED PREDICATE | | 1 | 2702 | 24 (5)| 00:00:01 |
|* 5 | HASH JOIN | | 1 | 2717 | 24 (5)| 00:00:01 |
|* 6 | TABLE ACCESS FULL | T4 | 1 | 2176 | 3 (0)| 00:00:01 |
|* 7 | TABLE ACCESS FULL | T3 | 1 | 541 | 20 (0)| 00:00:01 |
---------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter(ROWNUM<=10)
5 - access("T3"."OWNER"="T4"."USERNAME")
6 - filter("T4"."USERNAME"="T5"."OWNER")
7 - filter("T3"."TABLE_NAME"="T5"."OBJECT_NAME" AND
"T3"."OWNER"="T5"."OWNER")
Note
-----
- dynamic sampling used for this statement (level=2)
SQL> select * from (select /*+push_pred*/ * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner(+)=t5.owner and v.table_name(+)=t5.obj
ect_name;
已选择18515行。
执行计划
----------------------------------------------------------
Plan hash value: 1963531859
--------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 21334 | 59M| 501K (3)| 01:40:24 |
| 1 | NESTED LOOPS OUTER | | 21334 | 59M| 501K (3)| 01:40:24 |
| 2 | TABLE ACCESS FULL | T5 | 21334 | 4312K| 73 (0)| 00:00:01 |
| 3 | VIEW PUSHED PREDICATE | | 1 | 2702 | 24 (5)| 00:00:01 |
|* 4 | HASH JOIN | | 1 | 2717 | 24 (5)| 00:00:01 |
|* 5 | TABLE ACCESS FULL | T4 | 1 | 2176 | 3 (0)| 00:00:01 |
|* 6 | TABLE ACCESS FULL | T3 | 1 | 541 | 20 (0)| 00:00:01 |
--------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("T3"."OWNER"="T4"."USERNAME")
5 - filter("T4"."USERNAME"="T5"."OWNER")
6 - filter("T3"."TABLE_NAME"="T5"."OBJECT_NAME" AND
"T3"."OWNER"="T5"."OWNER")
Note
-----
- dynamic sampling used for this statement (level=2)
-----在不包含外连接的情况下，即时有rownum伪劣，也是无法谓词推进的
SQL> select * from (select /*+push_pred*/ * from t3,t4 where t3.owner=t4.username order by table_name) v,t5 where v.owner=t5.owner and v.table_name=t5.object_na
me and rownum<=10;
已选择10行。
执行计划
----------------------------------------------------------
Plan hash value: 87499378
---------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
---------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 10 | 29240 | | 792 (1)| 00:00:10 |
|* 1 | COUNT STOPKEY | | | | | | |
| 2 | NESTED LOOPS | | 11 | 32164 | | 792 (1)| 00:00:10 |
| 3 | VIEW | | 1683 | 4465K| | 7 (0)| 00:00:01 |
| 4 | SORT ORDER BY | | 1683 | 4465K| 6744K| 979 (1)| 00:00:12 |
|* 5 | HASH JOIN | | 1683 | 4465K| | 24 (5)| 00:00:01 |
| 6 | TABLE ACCESS FULL| T4 | 18 | 39168 | | 3 (0)| 00:00:01 |
| 7 | TABLE ACCESS FULL| T3 | 1683 | 889K| | 20 (0)| 00:00:01 |
|* 8 | TABLE ACCESS FULL | T5 | 1 | 207 | | 71 (0)| 00:00:01 |
---------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter(ROWNUM<=10)
5 - access("T3"."OWNER"="T4"."USERNAME")
8 - filter("V"."OWNER"="T5"."OWNER" AND "V"."TABLE_NAME"="T5"."OBJECT_NAME")
Note
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