标签：all_rows att following unique eve use over where eset
一、对当前的session使用oradebug命令：
SQL> conn / as sysdba
Connected.
SQL> oradebug setmypid
Statement processed.
或者对其他session做跟踪
--连接到一个外部服务进程，且pid=v$process.pid
oradebug setorapid pid
--连接到一个外部服务进程，且spid=v$process.spid
oradebug setospid spid
二、激活10046事件
SQL> oradebug event 10046 trace name context forever,level 12;
Statement processed.
三、执行目标sql语句
SQL> select empno,ename,dname from scott.emp,scott.dept where emp.deptno=dept.deptno;
EMPNO ENAME DNAME
---------- ---------- --------------
7782 CLARK ACCOUNTING
...省略相同内容
7654 MARTIN SALES
14 rows selected.
四、查看对应的trc文件及目录
SQL> oradebug tracefile_name;
/u01/oracle/diag/rdbms/neal/neal/trace/neal_ora_18691.trc
五、关闭当前的10046跟踪事件
SQL> oradebug event 10046 trace name context off;
Statement processed.
六、使用tkprof来格式化
[oracle@server ~]$ tkprof /u01/oracle/diag/rdbms/neal/neal/trace/neal_ora_18691.trc /tmp/neal_ora_18691.trc
七、查看得到的neal_ora_18691.trc文件
SQL ID: 3yfu3wh150aqt Plan Hash: 844388907
select empno,ename,dname
from
scott.emp,scott.dept where emp.deptno=dept.deptno
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.03 0.04 0 161 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 2 0.00 0.02 8 10 0 14
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 4 0.03 0.07 8 171 0 14
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: SYS
Number of plan statistics captured: 1
Rows (1st) Rows (avg) Rows (max) Row Source Operation
---------- ---------- ---------- ---------------------------------------------------
14 14 14 MERGE JOIN (cr=10 pr=8 pw=0 time=29081 us cost=6 size=364 card=14)
4 4 4 TABLE ACCESS BY INDEX ROWID DEPT (cr=4 pr=2 pw=0 time=19696 us cost=2 size=52card=4)
4 4 4 INDEX FULL SCAN PK_DEPT (cr=2 pr=1 pw=0 time=18734 us cost=1 size=0 card=4)(object id 87107)
14 14 14 SORT JOIN (cr=6 pr=6 pw=0 time=9416 us cost=4 size=182 card=14)
14 14 14 TABLE ACCESS FULL EMP (cr=6 pr=6 pw=0 time=9371 us cost=3 size=182 card=14)
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 10.81 20.69
Disk file operations I/O 1 0.00 0.00
db file sequential read 3 0.01 0.01
db file scattered read 1 0.00 0.00
********************************************************************************
OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.03 0.04 0 161 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 2 0.00 0.02 8 10 0 14
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 4 0.03 0.07 8 171 0 14
Misses in library cache during parse: 1
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 6 0.00 0.00
SQL*Net message from client 6 34.85 80.64
Disk file operations I/O 1 0.00 0.00
db file sequential read 3 0.01 0.01
SQL*Net break/reset to client 2 0.00 0.00
db file scattered read 1 0.00 0.00
OVERALL TOTALS FOR ALL RECURSIVE STATEMENTS
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 13 0.01 0.01 0 0 0 0
Execute 82 0.03 0.08 0 0 0 0
Fetch 104 0.00 0.00 1 261 0 93
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 199 0.05 0.09 1 261 0 93
Misses in library cache during parse: 12
Misses in library cache during execute: 12
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
Disk file operations I/O 1 0.00 0.00
db file sequential read 1 0.00 0.00
1 user SQL statements in session.
17 internal SQL statements in session.
18 SQL statements in session.
********************************************************************************
Trace file: /u01/oracle/diag/rdbms/neal/neal/trace/neal_ora_18691.trc
Trace file compatibility: 11.1.0.7
Sort options: default
1 session in tracefile.
1 user SQL statements in trace file.
17 internal SQL statements in trace file.
18 SQL statements in trace file.
17 unique SQL statements in trace file.
1323 lines in trace file.
10 elapsed seconds in trace file.
标签：all_rows att following unique eve use over where eset
原文地址：https://www.cnblogs.com/chendian0/p/10322267.html
