解决autotrace不显示Predicate Information的问题

来源：互联网发布：windows教育版不能用编辑：程序博客网时间：2024/06/10 01:53

用autotrace在有的数据库上可以看到Predicate Information，有时候看不到，原因是plan_table版本旧所致，解决方法如下：

SQL>set autotrace traceonly

SQL> select u.name
2    from user u
3   where u.department_id in (select d.department_id from department d);

执行计划
-----------------------------------------------------------------------------
| Id | Operation          | Name              | Rows | Bytes | Cost (%CPU)|
-----------------------------------------------------------------------------
|   0 | SELECT STATEMENT   |                   | 5251 | 89267 |    15   (7)|
|   1 | NESTED LOOPS      |                   | 5251 | 89267 |    15   (7)|
|   2 |   TABLE ACCESS FULL| USER          | 5273 | 63276 |    14   (0)|
|   3 |   INDEX UNIQUE SCAN| PK_DEPARTMENT |     1 |     5 |     0   (0)|
-----------------------------------------------------------------------------
Note
-----
   - 'PLAN_TABLE' is old version
统计信息
----------------------------------------------------------
          1 recursive calls
          0 db block gets
       6024 consistent gets
          0 physical reads
          0 redo size
      72158 bytes sent via SQL*Net to client
       4156 bytes received via SQL*Net from client
        348 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
       5195 rows processed

处理方法：
drop table PLAN_TABLE;
@?/rdbms/admin/utlxplan

SQL> select u.name
2 from user u
3 where u.department_id in (select d.department_id from department d);

执行计划
----------------------------------------------------------
Plan hash value: 2264021098

----------------------------------------------------------------------------------------
| Id | Operation          | Name              | Rows | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT   |                   | 5251 | 89267 |    15   (7)| 00:00:01 |
|   1 | NESTED LOOPS      |                   | 5251 | 89267 |    15   (7)| 00:00:01 |
|   2 |   TABLE ACCESS FULL| USER          | 5273 | 63276 |    14   (0)| 00:00:01 |
|* 3 |   INDEX UNIQUE SCAN| PK_DEPARTMENT |     1 |     5 |     0   (0)| 00:00:01 |
----------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
   3 - access("U"."DEPARTMENT_ID"="D"."DEPARTMENT_ID")

统计信息
----------------------------------------------------------
          0 recursive calls
          0 db block gets
       6024 consistent gets
          0 physical reads
          0 redo size
      72158 bytes sent via SQL*Net to client
       4156 bytes received via SQL*Net from client
        348 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
       5195 rows processed