运行TKPROF

1.生成跟踪文件

//会话级启用定时统计，TKPROF报告可以看到CPU时间，占用时间，可以看到瓶颈在哪里。

alter session set timed_statistics=true;

//alter session set events '10046 trace name context forever,level N'

//1启用标准SQL_TRACE工具（同SQL_TRACE=TRUE）

//4启用SQL_TRACE并捕捉跟踪文件中的绑定变量

//8启用SQL_TRACE并捕捉跟踪文件的等待事件

//12启用标准SQL_TRACE并捕捉绑定变量和等待事件

alter session set events '10046 trace name context forever,level 12';

select count(*) from big_table;

2.获取跟踪文件名

SQL> select rtrim(c.value,'/')||'/'||d.instance_name||'_ora_'||ltrim(to_char(a.spid))||'.trc'

2 from v$process a,v$session b,v$parameter c,v$instance d

3 where a.addr=b.paddr

4 and b.audsid= sys_context('userenv','sessionid')

5 and c.name='user_dump_dest';

RTRIM(C.VALUE,'/')||'/'||D.INSTANCE_NAME||'_ORA_'||LTRIM(TO_CHAR(A.SPID))||'.TRC

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

C:\ORACLE\PRODUCT\10.2.0\ADMIN\ORADB\UDUMP/oradb_ora_1212.trc

3.创建TKPROF报告

SQL> exit

从 Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options 断

开

在当前目录创建tk.prf文件

C:\Users\Administrator>tkprof c:\oracle\product\10.2.0\admin\oradb\udump/oradb_ora_1212.trc tk.prf

TKPROF: Release 10.2.0.4.0 - Production on 星期日 9月 9 22:11:13 2012

Copyright (c) 1982, 2007, Oracle. All rights reserved.

C:\Users\Administrator>

4.查看TKPROF报告

********************************************************************************

select count(*) from big_table

call count cpu elapsed disk query current rows

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

Parse 2 0.00 0.00 0 4 3 0

Execute 1 0.00 0.13 0 0 0 0

Fetch 2 0.17 0.32 1370 21885 1 1

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

total 5 0.17 0.46 1370 21889 4 1

Misses in library cache during parse: 1

Optimizer mode: ALL_ROWS

Parsing user id: SYS

Rows Row Source Operation

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

0 SORT AGGREGATE (cr=0 pr=0 pw=0 time=0 us)

0 TABLE ACCESS FULL BIG_TABLE (cr=0 pr=0 pw=0 time=0 us)

Elapsed times include waiting on following events:

Event waited on Times Max. Wait Total Waited

---------------------------------------- Waited ---------- ------------

SQL*Net break/reset to client 2 0.00 0.00

SQL*Net message to client 3 0.00 0.00

SQL*Net message from client 3 4.11 4.11

db file scattered read 87 0.01 0.13

********************************************************************************