读懂sql_trace

TKPROF: Release 11.2.0.1.0 - Development on 星期一 11月 3 21:39:41 2014



Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.



Trace file: c:\orcl_ora_4075.trc

Sort options: default



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

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: 4tk6t8tfsfqbf

Plan Hash: 0

alter session set sql_trace=true





call     count       cpu    elapsed       disk      query    current        rows

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

Parse        0      0.00       0.00          0          0          0           0

Execute      1      0.00       0.00          0          0          0           0

Fetch        0      0.00       0.00          0          0          0           0

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

total        1      0.00       0.00          0          0          0           0



Misses in library cache during parse: 0

Misses in library cache during execute: 1

Optimizer mode: ALL_ROWS

Parsing user id: SYS

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



select t.ename,m.dname from scott.EMP t,scott.dept m where t.deptno=m.deptno

and m.deptno=88



call     count       cpu    elapsed       disk      query    current        rows

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

Parse        1      0.00       0.00          0          0          0           0

Execute      1      0.00       0.00          0          0          0           0

Fetch        7      0.01       0.01          0         84          0          90

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

total        9      0.01       0.01          0         84          0          90



Misses in library cache during parse: 0--如果是软分析这里为0 硬分析为1

Optimizer mode: ALL_ROWS

Parsing user id: SYS



/*

cr=222957          -- 一致性读取数据库的块数  --相当于FETCH query的数目

pr=222186          -- 物理读取

pw=0               -- 物理写

time=100000562 us  -- 占用时间，单位：微妙 百万分之一秒

rows		--实际返回的行数



*/





Rows     Row Source Operation

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

     90  NESTED LOOPS  (cr=84 pr=0 pw=0 time=0 us cost=4 size=22 card=1)

      1   TABLE ACCESS BY INDEX ROWID DEPT (cr=2 pr=0 pw=0 time=0 us cost=1 size=13 card=1)

      1    INDEX UNIQUE SCAN PK_DEPT (cr=1 pr=0 pw=0 time=0 us cost=0 size=0 card=1)(object id 



73180)

     90   TABLE ACCESS FULL EMP (cr=82 pr=0 pw=0 time=0 us cost=3 size=9 card=1)



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



SQL ID: aam2chsgpj7mb

Plan Hash: 0

alter session set sql_trace=false





call     count       cpu    elapsed       disk      query    current        rows

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

Parse        1      0.00       0.00          0          0          0           0

Execute      1      0.00       0.00          0          0          0           0

Fetch        0      0.00       0.00          0          0          0           0

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

total        2      0.00       0.00          0          0          0           0



Misses in library cache during parse: 1

Optimizer mode: ALL_ROWS

Parsing user id: SYS







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



OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS



call     count       cpu    elapsed       disk      query    current        rows

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

Parse        2      0.00       0.00          0          0          0           0

Execute      3      0.00       0.00          0          0          0           0

Fetch        7      0.01       0.01          0         84          0          90

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

total       12      0.01       0.02          0         84          0          90



Misses in library cache during parse: 1

Misses in library cache during execute: 1





OVERALL TOTALS FOR ALL RECURSIVE STATEMENTS



call     count       cpu    elapsed       disk      query    current        rows

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

Parse        0      0.00       0.00          0          0          0           0

Execute      0      0.00       0.00          0          0          0           0

Fetch        0      0.00       0.00          0          0          0           0

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

total        0      0.00       0.00          0          0          0           0



Misses in library cache during parse: 0



    3  user  SQL statements in session.

    0  internal SQL statements in session.

    3  SQL statements in session.

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

Trace file: c:\orcl_ora_4075.trc

Trace file compatibility: 11.1.0.7

Sort options: default



       1  session in tracefile.

       3  user  SQL statements in trace file.

       0  internal SQL statements in trace file.

       3  SQL statements in trace file.

       3  unique SQL statements in trace file.

      57  lines in trace file.

      13  elapsed seconds in trace file.