今天接触一案例ORA-00600[kghstack_free2],恢复起来很简单,顺便记录下，供其他人遇到类似情况参考.

Wed Feb 20 15:05:04 2013
SMON: enabling cache recovery
Wed Feb 20 15:05:05 2013
Successfully onlined Undo Tablespace 1.
Wed Feb 20 15:05:05 2013
SMON: enabling tx recovery
Wed Feb 20 15:05:06 2013
Errors in file f:\oracle\product\10.2.0\admin\cksoltp\bdump\cksoltp_smon_3556.trc:
ORA-00600: internal error code, arguments: [kghstack_free2], [], [], [], [], [], [], []
Wed Feb 20 15:05:06 2013
Database Characterset is AL32UTF8
replication_dependency_tracking turned off (no async multimaster replication found)
Wed Feb 20 15:05:08 2013
Errors in file f:\oracle\product\10.2.0\admin\cksoltp\bdump\cksoltp_smon_3556.trc:
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_kghstack_err+101]
[PC:0x603CC77F] [ADDR:0x59004E04] [UNABLE_TO_READ] []
ORA-00600: internal error code, arguments: [kghstack_free2], [], [], [], [], [], [], []
Starting background process QMNC
QMNC started with pid=18, OS id=3504
Wed Feb 20 15:05:13 2013
Errors in file f:\oracle\product\10.2.0\admin\cksoltp\bdump\cksoltp_pmon_4064.trc:
ORA-00474: SMON process terminated with error

这个错误很明显是因为smon在回滚事务的时候，遇到异常从而出现ORA-00600[kghstack_free2]错误，使得数据库不能被正常open，通过分析trace文件发现回滚段36中有事务未提交，需要回滚，针对这样的数据库恢复方法很简单:1.屏蔽事务回滚，2.屏蔽回滚段强制offline等
1) EVENT=”10513 trace name context forever”
2）_offline_rollback_segments= _SYSSMU36$
数据库启动后，通过分析trace文件，找出来异常对象，然后重建该对象,除掉event/_offline_rollback_segments即可