例说一个ORACLE执行计划的查看

此例是不借助第三方工具，进行SQL执行计划的查看:

Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.1.0
Connected as irsadmin

SQL> explain plan for select * from loan_contract;

Explained

SQL> select * from table(dbms_xplan.display);

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Plan hash value: 1730730778
--------------------------------------------------------------------------------
| Id  | Operation         | Name          | Rows  | Bytes | Cost (%CPU)| Time
--------------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |               |     1 |   283 |     2   (0)| 00:00:0
|   1 |  TABLE ACCESS FULL| LOAN_CONTRACT |     1 |   283 |     2   (0)| 00:00:0
--------------------------------------------------------------------------------

8 rows selected

SQL>

总结：
1、SQL> explain plan for select ; --先进行解释
2、SQL> select * from table(dbms_xplan.display);　 --再查看解释的结果
3、还有一种方法，在pl/sql里F5。