toad 分析执行计划产生的影响

今天在群里碰到一哥们说生成环境和真实环境执行计划不一样，真实环境不走索引。测试环境几秒钟、真实环境2分多钟。

先上直接计划

SQL>   SELECT COUNT(*)
  2      FROM CLAFIMDF
  3     WHERE CLAIM_TYPE IN ('E', 'M')
  4       AND CLAIMS_PROCESS_STATUS in ('58', '80')
  5       AND ORIGBILL_DESPATCH_DATE IS NULL
  6       AND PAYOR_CODE IN (SELECT RPAD(STNCD, 7, ' ')
  7                            FROM SYM_USFFRSTN
  8                           WHERE USRID = 'ddd'
  9                             AND STNTYP = 'PY')
 10  /

Elapsed: 00:02:03.21

Execution Plan
----------------------------------------------------------

--------------------------------------------------------------------------------------
| Id  | Operation                     | Name            | Rows  | Bytes | Cost (%CPU)|
--------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT              |                 |     1 |    33 |  5964   (1)|
|   1 |  SORT AGGREGATE               |                 |     1 |    33 |            |
|   2 |   HASH JOIN RIGHT SEMI        |                 |   313 | 10329 |  5964   (1)|
|   3 |    TABLE ACCESS BY INDEX ROWID| SYM_USFFRSTN    |    62 |  1240 |    14   (0)|
|   4 |     INDEX RANGE SCAN          | SYM_USRSTN_IDX1 |    62 |       |     3   (0)|
|   5 |    TABLE ACCESS FULL          | CLAFIMDF        |  6570 | 85410 |  5949   (1)|
--------------------------------------------------------------------------------------

Note
-----
   - 'PLAN_TABLE' is old version


Statistics
----------------------------------------------------------
          1  recursive calls
          0  db block gets
     351759  consistent gets
      84257  physical reads
          0  redo size
        420  bytes sent via SQL*Net to client
        420  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          1  rows processed

请注意这个 - 'PLAN_TABLE' is old version ，这个是神马意思？

原因，曾经使用toad的执行计划分析，所以执行了它自带的脚本生成的plan_table

解决方式：重新创建plan_table，

SQL> drop table PLAN_TABLE;

SQL> @?/rdbms/admin/utlxplan

这个做完以后，说问题解决了，具体就不知道了。呵呵，如果不走索引，可以看看10053事件。10053事件下回补充

但是难道toad就不能随便用吗？不是的，toad的执行计划可以使用TOAD_PLAN_TABLE 来存放嘛！

完工。