oracle oradebug systemstate 的日常使用

oracle oradebug systemstate 是dba分析instance的重要方法，需要勤加练习、多多分析。

数据库版本

$sqlplus system/oracleoracle

SQL*Plus: Release 12.2.0.1.0 Production on Fri Apr 27 17:35:11 2018

Copyright (c) 1982, 2016, Oracle.  All rights reserved.


Connected to:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production

SQL>
SQL> set lines 200; 
SQL> set pages 200;
SQL> 
SQL> select * from v$version;

BANNER                                           CON_ID
-------------------------------------------------------------------------------- ----------
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production          0
PL/SQL Release 12.2.0.1.0 - Production                            0
CORE    12.2.0.1.0  Production                                0
TNS for Linux: Version 12.2.0.1.0 - Production                        0
NLSRTL Version 12.2.0.1.0 - Production                            0

SQL>

创建测试表，插入测试数据

SQL> create table tmp_peiyb_20180427 ( a varchar2(100),b varchar2(100));

Table created.

SQL> insert into tmp_peiyb_20180427(a,b) values('aa','bb');

1 row created.

SQL> commit;

Commit complete.

SQL> 
SQL>

session 1 更新，不commit

SQL> update tmp_peiyb_20180427 set b='cc' where a='aa';

1 row updated.

SQL>

session 2 更新，会处于wait状态

SQL> update tmp_peiyb_20180427 set b='cc' where a='aa';

session 3 使用sys执行 oradebug systemstate

SQL> oradebug setmypid;
Statement processed.
SQL> oradebug unlimit;
Statement processed.
SQL> oradebug dump systemstate 266; 
Statement processed.
SQL> oradebug TRACEFILE_NAME;
/u01/app/oracle/diag/rdbms/rac0/rac01/trace/rac01_ora_11369.trc
SQL> 
SQL> 
SQL> 
SQL> 
SQL> oradebug dump systemstate 266;
Statement processed.
SQL> oradebug TRACEFILE_NAME;
/u01/app/oracle/diag/rdbms/rac0/rac01/trace/rac01_ora_11369.trc
SQL> oradebug CLOSE_TRACE;
Statement processed.

session 3 rac环境下使用sys执行 oradebug systemstate

SQL> oradebug setmypid;
Statement processed.
SQL> oradebug unlimit;
Statement processed.
SQL> oradebug setinst all;
Statement processed.
SQL> oradebug -g def dump systemstate 266;
Statement processed.
SQL> oradebug TRACEFILE_NAME;
/u01/app/oracle/diag/rdbms/rac0/rac01/trace/rac01_ora_13859.trc
SQL> 
SQL> 
SQL> 
SQL>
SQL> oradebug CLOSE_TRACE;
Statement processed.

无法登录数据库，需要添加 -prelim 参数

sqlplus -prelim / as sysdba;