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