斷電後回退段損壞引發的ora-00600錯誤修復

一用戶的817的庫啓動時出現以下錯誤：

Recovery of Online Redo Log: Thread 1 Group 3 Seq 1608 Reading mem 0
Mem# 0 errs 0: D:ORACLEORADATAORACLEREDO01.LOG
Tue Feb 24 15:46:59 2009
Errors in file D:oracleadminoraclebdumporacleSMON.TRC:
ORA-01595: error freeing extent (6) of rollback segment (3))
ORA-00600: internal error code, arguments: [4193], [291], [299], [], [], [], [], []

Tue Feb 24 15:47:17 2009
Completed: alter database open

能夠看到，數據庫已經正確打開，但因爲2號回退段損壞，致使了ora-01600 [4193]錯誤。

先看看當前系統中的回退段：
SQL> connect / as sysdba;
已鏈接。
SQL> select usn,name from v$rollname;

USN NAME
---------- ------------------------------
0 SYSTEM
1 RBS0
3 RBS2
4 RBS3
5 RBS4
6 RBS5
7 RBS6
8 RBS_ZLTOOLS

已選擇8行。

因爲是3號回退段損壞，直接offline而且drop損壞的回退段

SQL> alter rollback segment rbs2 offline;

重算段已修改。

SQL> drop rollback segment rbs2 ;

重算段已丟掉。

SQL>

刪除損壞回退段後，還發現5號回退段也損壞了，也刪除重建;以後經測試數據庫恢復正常。幸虧數據庫還能正常打開，不然處理起來就麻煩不少了。

下面是metalink上 ora-00600 [4093]錯誤的解釋

Note: For additional ORA-600 related information please read Note 146580.1

PURPOSE:
This article discusses the internal error "ORA-600 [4193]", what
it means and possible actions. The information here is only applicable
to the versions listed and is provided only for guidance.

ERROR:
ORA-600 [4193] [a] [b]

VERSIONS:
versions 6.0 to 10.1

DESCRIPTION:

A mismatch has been detected between Redo records and Rollback (Undo)
records.

We are validating the Undo block sequence number in the undo block against
the Redo block sequence number relating to the change being applied.

This error is reported when this validation fails.

ARGUMENTS:
Arg [a] Undo record seq number
Arg [b] Redo record seq number

FUNCTIONALITY:
KERNEL TRANSACTION UNDO

IMPACT:
PROCESS FAILURE
POSSIBLE ROLLBACK SEGMENT CORRUPTION

SUGGESTIONS:

This error may indicate a rollback segment corruption.

This may require a recovery from a database backup depending on
the situation.

For further analysis, please submit the trace files and alert.log to
Oracle Support Services.

Known Issues: