مشكله قاعدة البيانات لا تعمل

SQL> STARTUP
ORACLE instance started.

Total System Global Area 167772160 bytes
Fixed Size 1247900 bytes
Variable Size 96470372 bytes
Database Buffers 67108864 bytes
Redo Buffers 2945024 bytes
Database mounted.
ORA-00368: checksum error in redo log block
ORA-00353: log corruption near block 25962 change 980439 time 03/12/2009
13:45:50
ORA-00312: online log 1 thread 1:
'E:\ORACLE\PRODUCT\10.2.0\ORADATA\ADB\REDO01.LOG'