RECOVERY IN NOARCHIVE LOG MODE

Question

Dear all,
Please help me in solving this recovery issue :
My database is : oracle 8i server ent.edition
database runs on windows 2000
db confgiured in no archive logmode
when I start the database today :
am getting the following error :
O/S-Error: (OS 23) Data error (cyclic redundancy check).'
error 1242 detected in background process
ORA-01242: data file suffered media failure: database in NOARCHIVELOG mode
ORA-01114: IO error writing block to file 2 (block # 1936)
ORA-01110: data file 2: 'c:\ORACLE\ORADATA\ORACLE\RBS01.DBF'
ORA-27072: skgfdisp: I/O error
OSD-04008: WriteFile() failure, unable to write to file
O/S-Error: (OS 23) Data error (cyclic redundancy check).
this tablespace rbs is defined only for rollback segments..
since db in noarhicve log mode, I cant able to take the datafile offline.. I tried doing
ALTER DATABASE RECOVER
which resulted in the above error .
I have valid 1 month old cold backup..
when I try to drop the tablespace, it fails with the above error.. .
Please guide me as this is the production database..
Thanks in advance
Please help me
Kai

Answer 1

Were you able to achieve a NORMAL or IMMEDIATE shutdown of the database ?
In that case the Rollback segments are not required at startup.
So,
1 comment out the entry "rollback_segments=...(namesofrollbacksegments)"
from the init.ora
2. connect / as sysdba and STARTUP MOUNT;
3. ALTER DATABASE DATAFILE '<filenameforRBS>' OFFLINE DROP ;
4. ALTER DATABASE OPEN;
Additional steps : CREATE ROLLBACK SEGMENT SYS_RBS01
TABLESPACE SYSTEM;
ALTER ROLLBACK SEGMENT SYS_RBS01 ONLINE;
5. DROP TABLESPACE RBS ; (check the name of the tablespace)
6. CREATE TABLESPACE RBS (or NEWRBS) DATAFILE ....
7. CREATE ROLLBACK SEGMENT ........ and create multiple segments in
the new RBS tablespace
8. SHUTDOWN
9. Edit init.ora to set the rollback segment names again
10. STARTUP
HOWEVER if your database shutdown was not normal or immediate but an
abort, Oracle would try to do an Instance Recovery. In that case, you would
need to use "_corrupted_rollback_segments" and may lose data consistency.
Check MetaLink for notes on that. But first check your shutdown and see if
you can follow the steps suggested by Sybrand and me.
Added additional steps for SYS_RBS01 in the SYSTEM
tablespace for any actions on the RBS tablespace.
Message was edited by:
Hemant K Chitale