jonas_li 发表于 -12-18 15:14
执行计划也可以贴出来，看看，是否真的如此
Execution Plan
----------------------------------------------------------
Plan hash value: 454689222
-----------------------------------------------------------------------------------------------------
| Id| Operation | Name | Rows| Bytes | Cost (%CPU)| Time |
-----------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT||1729 | 288K|389 (2)| 00:00:05 |
|*1 |HASH JOIN ||1729 | 288K|389 (2)| 00:00:05 |
| 2 | VIEW||1479 | 196K|8(13)| 00:00:01 |
| 3 | HASH GROUP BY||1479 |1441K|8(13)| 00:00:01 |
|*4 | FILTER || | | | |
| 5 | NESTED LOOPS OUTER ||1479 |1441K|7 (0)| 00:00:01 |
| 6 | NESTED LOOPS||1479 |1198K|7 (0)| 00:00:01 |
|*7 | TABLE ACCESS FULL | A| 3 | 42 |7 (0)| 00:00:01 |
|*8 | TABLE ACCESS BY INDEX ROWID| B| 430 | 342K|0 (0)| 00:00:01 |
|*9 | INDEX RANGE SCAN | INX_A |7464 | |0 (0)| 00:00:01 |
|10 | TABLE ACCESS BY INDEX ROWID | D| 1 | 168 |0 (0)| 00:00:01 |
|* 11 | INDEX UNIQUE SCAN | PK_D | 1 | |0 (0)| 00:00:01 |
|* 12 | TABLE ACCESS FULL| C| 68087 |2327K|380 (2)| 00:00:05 |
-----------------------------------------------------------------------------------------------------
Execution Plan
----------------------------------------------------------
Plan hash value: 454689222
-----------------------------------------------------------------------------------------------------
| Id| Operation | Name | Rows| Bytes | Cost (%CPU)| Time |
-----------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT||1710 | 285K|389 (2)| 00:00:05 |
|*1 |HASH JOIN ||1710 | 285K|389 (2)| 00:00:05 |
| 2 | VIEW||1463 | 194K|8(13)| 00:00:01 |
| 3 | HASH GROUP BY||1463 |1425K|8(13)| 00:00:01 |
|*4 | FILTER || | | | |
| 5 | NESTED LOOPS OUTER ||1463 |1425K|7 (0)| 00:00:01 |
| 6 | NESTED LOOPS||1463 |1185K|7 (0)| 00:00:01 |
|*7 | TABLE ACCESS FULL | A| 3 | 42 |7 (0)| 00:00:01 |
|*8 | TABLE ACCESS BY INDEX ROWID| B| 425 | 338K|0 (0)| 00:00:01 |
|*9 | INDEX RANGE SCAN | INX_A |7464 | |0 (0)| 00:00:01 |
|10 | TABLE ACCESS BY INDEX ROWID | D| 1 | 168 |0 (0)| 00:00:01 |
|* 11 | INDEX UNIQUE SCAN | PK_D | 1 | |0 (0)| 00:00:01 |
|* 12 | TABLE ACCESS FULL| C| 68087 |2327K|380 (2)| 00:00:05 |
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