使用10046追踪执行计划demo

（一）开启10046追踪

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

（二）执行sql语句

SELECT J.JOB_ID,
       J.JOB_TITLE,
       J.MIN_SALARY,
       J.MAX_SALARY,
       E.EMPLOYEE_ID,
       E.FIRST_NAME || E.LAST_NAME AS NAME,
       E.EMAIL,
       E.PHONE_NUMBER
  FROM JOBS J, EMPLOYEES E
 WHERE J.JOB_ID = E.JOB_ID;

（三）关闭追踪

SQL> alter session set events '10046 trace name context off';

（四）在查看alert目录里面找到新生成的文件，执行分析

(4.1)找到文件

[oracle@rac1 trace]$ pwd

/u01/app/oracle/diag/rdbms/rac/rac1/trace

[oracle@rac1 trace]$ ls -lrt

...

...

-rw-r----- 1 oracle asmadmin 196 Jan 14 15:41 rac1_ora_27998.trm

-rw-r----- 1 oracle asmadmin 9530 Jan 14 15:41 rac1_ora_27998.trc

（4.2）解析trc文件

[oracle@rac1 trace]$ tkprof rac1_ora_27998.trc lijiaman_10046.txt sys=no sort=prsela,exeela,fchela

（4.3）查看解析后的文件

[oracle@rac1 trace]$ ls -lrt
...
-rw-r----- 1 oracle asmadmin 112680 Jan 14 15:39 rac1_ora_12468.trc
-rw-r----- 1 oracle asmadmin 196 Jan 14 15:41 rac1_ora_27998.trm
-rw-r----- 1 oracle asmadmin 9530 Jan 14 15:41 rac1_ora_27998.trc
-rw-r--r-- 1 oracle oinstall 8587 Jan 14 15:43 lijiaman_10046.txt

---

附录：解析后文件信息

TKPROF: Release 11.2.0.1.0 - Development on Sun Jan 14 15:43:44 2018

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

Trace file: rac1_ora_27998.trc

Sort options: prsela exeela 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

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

select j.job_id,

j.job_title,

j.min_salary,

j.max_salary,

e.employee_id,

e.first_name||e.last_name as name,

e.email,

e.phone_number

from jobs j,employees e

where j.job_id = e.job_id

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 2 0.00 0.00 0 11 0 107

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

total 4 0.00 0.00 0 11 0 107

Misses in library cache during parse: 1

Optimizer mode: ALL_ROWS

Parsing user id: 85

Rows Row Source Operation

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

107 MERGE JOIN (cr=11 pr=0 pw=0 time=2014 us cost=6 size=8988 card=107)

19 TABLE ACCESS BY INDEX ROWID JOBS (cr=4 pr=0 pw=0 time=90 us cost=2 size=627 card=19)

19 INDEX FULL SCAN JOB_ID_PK (cr=2 pr=0 pw=0 time=18 us cost=1 size=0 card=19)(object id 73932)

107 SORT JOIN (cr=7 pr=0 pw=0 time=78 us cost=4 size=5457 card=107)

107 TABLE ACCESS FULL EMPLOYEES (cr=7 pr=0 pw=0 time=106 us cost=3 size=5457 card=107)

Elapsed times include waiting on following events:

Event waited on Times Max. Wait Total Waited

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

SQL*Net message to client 3 0.00 0.00

SQL*Net message from client 3 0.86 0.93

Disk file operations I/O 1 0.00 0.00

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

SQL ID: 9m7787camwh4m

Plan Hash: 0

begin :id := sys.dbms_transaction.local_transaction_id; end;

call count cpu elapsed disk query current rows

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

Parse 4 0.00 0.00 0 0 0 0

Execute 4 0.00 0.00 0 0 0 4

Fetch 0 0.00 0.00 0 0 0 0

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

total 8 0.00 0.00 0 0 0 4

Misses in library cache during parse: 0

Optimizer mode: ALL_ROWS

Parsing user id: 85

Elapsed times include waiting on following events:

Event waited on Times Max. Wait Total Waited

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

SQL*Net message to client 4 0.00 0.00

SQL*Net message from client 4 60.12 72.13

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

SQL ID: 5x323vaz5nuu4

Plan Hash: 0

alter session set events '10046 trace name context off'

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: 0

Parsing user id: 85

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

SQL ID: cf06fwacdmgfk

Plan Hash: 1388734953

select 'x'

from

dual

call count cpu elapsed disk query current rows

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

Parse 2 0.00 0.00 0 0 0 0

Execute 2 0.00 0.00 0 0 0 0

Fetch 2 0.00 0.00 0 0 0 2

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

total 6 0.00 0.00 0 0 0 2

Misses in library cache during parse: 0

Optimizer mode: ALL_ROWS

Parsing user id: 85

Rows Row Source Operation

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

1 FAST DUAL (cr=0 pr=0 pw=0 time=0 us cost=2 size=0 card=1)

Elapsed times include waiting on following events:

Event waited on Times Max. Wait Total Waited

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

SQL*Net message to client 5 0.00 0.00

SQL*Net message from client 5 0.01 0.02

rdbms ipc reply 3 0.00 0.00

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

OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS

call count cpu elapsed disk query current rows

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

Parse 8 0.00 0.00 0 0 0 0

Execute 8 0.00 0.00 0 0 0 4

Fetch 4 0.00 0.00 0 11 0 109

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

total 20 0.00 0.00 0 11 0 113

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 12 0.00 0.00

SQL*Net message from client 12 60.12 73.09

rdbms ipc reply 3 0.00 0.00

Disk file operations I/O 1 0.00 0.00

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

8 user SQL statements in session.

0 internal SQL statements in session.

8 SQL statements in session.

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

Trace file: rac1_ora_27998.trc

Trace file compatibility: 11.1.0.7

Sort options: prsela exeela fchela

1 session in tracefile.

8 user SQL statements in trace file.

0 internal SQL statements in trace file.

8 SQL statements in trace file.

4 unique SQL statements in trace file.

152 lines in trace file.

73 elapsed seconds in trace file.

【完】