Control file corrupted

Question

HI, My database was operating on noarchivelog mode, I do have a backup from last night but all three control files seemed to be corrupted. Is there anyway, i can create new control file and syncronise with rest of the files?. If yes, can you please tell me the steps involved in creating new controlfile as I don't have any idea how to do that. Thanks alot.

Answer 1

Hi,
Set oracle_sid="your sid name"
connect to sqlplus
SQL>conn/as sysdba
start your database in nomount stage
SQL>Startup nomount
Then type the following commands
SQL> CREATE CONTROLFILE REUSE DATABASE "your database name"
MAXLOGFILES 5 --optional
MAXLOGMEMBERS 3 --optional
MAXDATAFILES 14 --optional
MAXINSTANCES 1 --optional
MAXLOGHISTORY 226 --optional
LOGFILE
GROUP 1 'your logfile path' SIZE your logfile size,
GROUP 2 'your logfile path' SIZE your logfile size
DATAFILE
'your datafile path',
'your datafile path'
After that open the database with RESETLOGS
then shutdown the database
SQL>shu
Now multiflex the control file and mention the path in init file
And take the complete closed backup( backup your datafile, control file, logfile)
Then startup the database
SQL> Startup
Now your database is ready to USE.
This is the Example to:
SQL> CREATE CONTROLFILE REUSE DATABASE "ORCL"
MAXLOGFILES 5
MAXLOGMEMBERS 3
MAXDATAFILES 14
MAXINSTANCES 1
MAXLOGHISTORY 226
LOGFILE
GROUP 1 'E:\ORACLE\ORADATA\ORCL\REDO01.LOG' SIZE 100M,
GROUP 2 'E:\ORACLE\ORADATA\ORCL\REDO02.LOG' SIZE 100M,
GROUP 3 'E:\ORACLE\ORADATA\ORCL\REDO03.LOG' SIZE 100M
DATAFILE
'E:\ORACLE\ORADATA\ORCL\UNDOTBS01.DBF',
'E:\ORACLE\ORADATA\ORCL\EXAMPLE01.DBF',
'E:\ORACLE\ORADATA\ORCL\INDX01.DBF',
'E:\ORACLE\ORADATA\ORCL\TOOLS01.DBF',
'E:\ORACLE\ORADATA\ORCL\USERS01.DBF',
'E:\ORACLE\ORADATA\ORCL\OEM_REPOSITORY.DBF',
'E:\ORACLE\ORADATA\ORCL\CWMLITE01.DBF',
'E:\ORACLE\ORADATA\ORCL\DRSYS01.DBF',
'E:\ORACLE\ORADATA\ORCL\ODM01.DBF',
'E:\ORACLE\ORADATA\ORCL\XDB01.DBF',
'E:\ORACLE\ORADATA\ORCL\USERS02.DBF',
'E:\ORACLE\ORADATA\ORCL\USERS03.DBF',
'E:\ORACLE\ORADATA\ORCL\USERS04.DBF'
SQL>ALTER DATABASE OPEN RESETLOGS;
And one more thing:
To rename the database change reuse to set in the create control file script as shown below
Regards
S.Senthil Kumar