sql 调优方式1

sql 代码

连接到:
Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> explain plan set statement_id='me' for select * from employee
  2  /

已解释。

SQL> @D:\oracle\product\10.1.0\db_1\RDBMS\ADMIN\utlxpls.sql

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Plan hash value: 1837852109

------------------------------------------------------------------------------
| Id  | Operation         | Name     | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |          |     2 |    98 |     2   (0)| 00:00:01 |
|   1 |  TABLE ACCESS FULL| EMPLOYEE |     2 |    98 |     2   (0)| 00:00:01 |
------------------------------------------------------------------------------

已选择8行。

SQL> SELECT A.OPERATION,OPTIONS,OBJECT_NAME,OBJECT_TYPE,ID,PARENT_ID
  2  from plan_table a where a.statement_id='me' order by id
  3  /

OPERATION
------------------------------
OPTIONS
--------------------------------------------------------------------------------
OBJECT_NAME                    OBJECT_TYPE                            ID
------------------------------ ------------------------------ ----------
 PARENT_ID
----------
SELECT STATEMENT

                                                                       0



OPERATION
------------------------------
OPTIONS
--------------------------------------------------------------------------------
OBJECT_NAME                    OBJECT_TYPE                            ID
------------------------------ ------------------------------ ----------
 PARENT_ID
----------
TABLE ACCESS
FULL
EMPLOYEE                       TABLE                                   1
         0


SQL> set timing on
SQL> set autorrace on
SP2-0158: 未知的 SET 选项 "autorrace"
SQL> set autotrace on
SQL> select * from employee
  2  /

ID   FIRST_NAME LAST_NAME  START_DATE     END_DATE           SALARY CITY
---- ---------- ---------- -------------- -------------- ---------- ----------
DESCRIPTION
---------------
01   Jason      Martin     25-7月 -96     25-7月 -06        1234.56 Toronto
Programmer

02   Alison     Mathews    21-3月 -76     21-2月 -86        6661.78 Vancouver
Tester


已用时间:  00: 00: 00.03

执行计划
----------------------------------------------------------
   0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=2 Card=2 Bytes=98)
   1    0   TABLE ACCESS (FULL) OF 'EMPLOYEE' (TABLE) (Cost=2 Card=2 B
          ytes=98)





统计信息
----------------------------------------------------------
          1  recursive calls
          0  db block gets
          4  consistent gets
          2  physical reads
          0  redo size
        940  bytes sent via SQL*Net to client
        512  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          2  rows processed

SQL> set autotrace traceonly
SQL> select * from employee
  2  /

已用时间:  00: 00: 00.00

执行计划
----------------------------------------------------------
   0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=2 Card=2 Bytes=98)
   1    0   TABLE ACCESS (FULL) OF 'EMPLOYEE' (TABLE) (Cost=2 Card=2 B
          ytes=98)





统计信息
----------------------------------------------------------
          0  recursive calls
          0  db block gets
          4  consistent gets
          0  physical reads
          0  redo size
        940  bytes sent via SQL*Net to client
        512  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          2  rows processed

SQL>

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