［terry笔记］Oracle会话追踪（二）：TKPROF

接上一笔记［terry笔记］Oracle会话追踪（一）：SQL_TRACE&EVENT 10046

http://www.cnblogs.com/kkterry/p/3279282.html

在系统下执行tkprof，效果是把trace文件转换成可供人类阅读的格式

（个人感觉不是很爽，trace文件输出的时候直接弄个好格式不就得了）

语法：

tkprof tracefile output_file

explain=username/passwd ##对trace文件中的sql语句产生执行计划，会在这个用户下产生plan_table，并在tkprof结束时删除。
sys=yes|no ##选no，用来屏蔽oracle内部递归sql
waits=yes|no ##选yes，记录等待事件概要
aggregate=yes|no ##选yes，oracle会组合相同sql文本的多个用户
record=filename ##会生成一个保存所有sql语句的文件
print=number ##只显示前N条语句，一般和sort一起用
insert=filename ##生成一个脚本，记录所追踪的sql语句的insert
sort=parameters ##输出的内容按照某项排序：按照实际执行时间排序fchela，物理读排序fchdsk

例子：

tkprof ora11g_ora_11111.trc scott.txt explain=scott/tiger sys=no waits=yes sort=fchela

 

tkprof的输出（分上下两部分）：

TKPROF: Release 11.2.0.3. - Development on Sat Aug  :: 

Copyright (c) , , Oracle and/or its affiliates.  All rights reserved.

Trace file: ora11g_ora_5829.trc
Sort options: fchela
********************************************************************************
count     = number of times OCI procedure was executed
cpu        = cpu time in seconds executing
elapsed  = elapsed time in seconds executing
disk       = number of physical reads of buffers from disk
query    = number of buffers gotten for consistent read
current  = number of buffers gotten in current mode (usually for update)
rows     = number of rows processed by the fetch or execute call
********************************************************************************

SQL ID: 9kcpyjv574vjc Plan Hash: 

select * from t1 where owner='SYSTEM'
call     count       cpu    elapsed       disk      query    current        rows
------- ------  -------- ---------- ---------- ---------- ----------  ----------
Parse              0.00       0.00
Execute            0.00       0.00
Fetch             0.00       0.01
------- ------  -------- ---------- ---------- ---------- ----------  ----------
total             0.00       0.01                                 

Misses in library cache during parse:
Optimizer mode: ALL_ROWS
Parsing user id:   (U1)
Number of plan statistics captured: 

Rows (1st) Rows (avg) Rows (max)  Row Source Operation
---------- ---------- ----------  ---------------------------------------------------
                         TABLE ACCESS FULL T1 (cr= pr= pw= time= us cost= size= card=)

Rows     Execution Plan
-------  ---------------------------------------------------
        SELECT STATEMENT   MODE: ALL_ROWS
       TABLE ACCESS (FULL) OF 'T1' (TABLE)

Trace file: ora11g_ora_5829.trc
Trace file compatibility: 11.1.0.7
Sort options: fchela
         session in tracefile.
         user  SQL statements in trace file.  ##这里面共有5个sql
         internal SQL statements in trace file.  ##1个sql是oracle内部递归
         SQL statements in trace file.
         unique SQL statements in trace file.
         SQL statements EXPLAINed using schema:
           U1.prof$plan_table
             Default table was used.
             Table was created.
             Table was dropped.
       lines in trace file.
        elapsed seconds in trace file.

 

这里解释下query和current

query就是select语句在内存中检索了多少块

current就是update、delete等语句在内存中修改了多少块

 

一些指标：

好的情况是以很少的fatch获取更多的rows。

query的parse指的是从数据字典(dictionary cache)中获取多少块。

主要以CPU列和elapsed列来衡量资源的消耗。

要消灭全表扫描。