0 概览

hanganaylze主要步骤：

oradebugsetmypid

oradebugunlimit

--RAC环境

oradebugsetinstall

--级别一般指定为3足够了

oradebughanganalyze3

--RAC环境

oradebug-g defdump systemstate10

oradebugtracefile_name

解读 hanganalyze 报告

State of ALL nodes

([nodenum]/cnode/sid/sess_srno/session/ospid/state/[adjlist]):

[124]/1/125/7/0xcb8b7c30/2985/LEAF/

[137]/1/138/85/0xcb8900d0/3456/NLEAF/[124]

这里主要是：

nodenum，将相关信息关联起来

cnode，数据库节点编号，rac中有用

sid，会话的 sid

sess_srno，serial#

ospid，pid

state，表示session状态重点关注LEAF状态的节点，它们通常就是造成阻塞的关键会话

adjlist，关联会话的nodenum，通常就是blocker的nodenum

1 制造阻塞

session 1

SQL> update scott.emp_t set comm = 1000 where empno=7788;

1 row updated.

session 2

SQL> update scott.emp_t set comm = 1500 where empno = 7788;

2 hanganalyze

[[email protected] ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Wed Jun 21 21:40:52 2017

Copyright (c) 1982, 2013, Oracle. All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> oradebug setmypid

Statement processed.

SQL> oradebug unlimit

Statement processed.

SQL> oradebug hanganalyze 3

Hang Analysis in /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_3642.trc

SQL> oradebug tracefile_name

/u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_3642.trc

SQL> exit

文件比较长，主要是下面这段

[[email protected] ~]$ vim /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_3642.trc

State of ALL nodes

([nodenum]/cnode/sid/sess_srno/session/ospid/state/[adjlist]):

[124]/1/125/7/0xcb8b7c30/2985/LEAF/

[137]/1/138/85/0xcb8900d0/3456/NLEAF/[124]

sid = 125 serial = 7 pid = 2985 阻塞了 138，85，3456

3 kill 阻塞会话

kill会话有两种方式，oracle内kill相关sid，以及系统中kill相关pid

oracle内kill相关sid

alter system kill session 'sid， s.serial#‘;

linux中就是 kill -9

SQL> alter system kill session '125,7';

System altered.

4 查看结果

session 1

SQL> select * from scott.emp_t;

select * from scott.emp_t

*

ERROR at line 1:

ORA-00028: your session has been killed

session 2

1 row updated.

SQL> set lines 200

SQL> select * from scott.emp_t;

EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO

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

7369 SMITH CLERK 7902 17-DEC-80 800 20

....

14 rows selected.

5 其他资料

如果感兴趣可以查看下面的资料，虽然有些有出入，可以作为参考

Oracle Hanganalyze 分析

查询Oracle正在执行和执行过的SQL语句

https://www.cndba.cn/xkan/article/2000

https://www.cndba.cn/xkan/article/2000

https://www.cndba.cn/xkan/article/2000

https://www.cndba.cn/xkan/article/2000

https://www.cndba.cn/xkan/article/2000

https://www.cndba.cn/xkan/article/2000

https://www.cndba.cn/xkan/article/2000

https://www.cndba.cn/xkan/article/2000

https://www.cndba.cn/xkan/article/2000

https://www.cndba.cn/xkan/article/2000

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