autotrace显示Statistics很多信息为0(转)

一朋友使用autotrace查看数据库执行计划发现结果如下,Statistics中很多信息为0,这个肯定是不正常现象,什么都可以为0,consistent gets也不可能为0.

SQL> set autot on

SQL> select count(*) from RACV_DATA.PARTY_DUMMY;

 

  COUNT(*)

----------

        47

 

Elapsed: 00:00:00.00

 

Execution Plan

----------------------------------------------------------

Plan hash value: 3621440939

 

--------------------------------------------------------------------------

| Id  | Operation          | Name        | Rows  | Cost (%CPU)| Time     |

--------------------------------------------------------------------------

|   0 | SELECT STATEMENT   |             |     1 |     3   (0)| 00:00:01 |

|   1 |  SORT AGGREGATE    |             |     1 |            |          |

|   2 |   TABLE ACCESS FULL| PARTY_DUMMY |    47 |     3   (0)| 00:00:01 |

--------------------------------------------------------------------------

 

 

Statistics

----------------------------------------------------------

          0  recursive calls

          0  db block gets

          0  consistent gets

          0  physical reads

          0  redo size

          0  bytes sent via SQL*Net to client

          0  bytes received via SQL*Net from client

          0  SQL*Net roundtrips to/from client

          0  sorts (memory)

          0  sorts (disk)

          1  rows processed

解决方法

SQL>  select owner,object_name from dba_objects where object_name='PLAN_TABLE';

 

no rows selected

 

SQL> @?/rdbms/admin/utlxplan.sql

 

Table created.

重新查看Statistics信息

Statistics

----------------------------------------------------------

          0  recursive calls

          0  db block gets

          7  consistent gets

          0  physical reads

          0  redo size

        522  bytes sent via SQL*Net to client

        524  bytes received via SQL*Net from client

          2  SQL*Net roundtrips to/from client

          0  sorts (memory)

          0  sorts (disk)

          1  rows processed

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