1、开启会话跟踪
set autotrace on;


2、执行sql
select * from ep_bill where bill_id='10000003'


Execution Plan
----------------------------------------------------------
Plan hash value: 236855796


-----------------------------------------------------------------------------
| Id  | Operation         | Name    | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |         |  5060 |  9611K|   124K  (1)| 00:24:57 |
|*  1 |  TABLE ACCESS FULL| EP_BILL |  5060 |  9611K|   124K  (1)| 00:24:57 |
-----------------------------------------------------------------------------


Predicate Information (identified by operation id):
---------------------------------------------------


   1 - filter("BILL_ID"=10000003)


Note
-----
   - dynamic sampling used for this statement (level=2)




Statistics
----------------------------------------------------------
         23  recursive calls
          0  db block gets
     459265  consistent gets
     459402  physical reads
         72  redo size
       1945  bytes sent via SQL*Net to client
        519  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          1  rows processed
          
3、autotrace实用程序的选项


on                  描写查询结果、执行计划和统计数据
on statistic          显示查询结果和统计数据，但不包括执行计划
on explain            显示查询结果和执行计划，但不包括统计数据
traceonly             显示执行计划和统计数据，但不显示结果
traceonly statistics  仅显示统计数据，不包括执行计划
off                   关闭autotrace实用程序