#360

Symptoms

After Power Fail Alter database open fails with

ORA-00600: internal error code, arguments: [kcratr_nab_less_than_odr]

Changes

Power failure

Cause

There was a power failure causing logical corruption in controlfile

Solution

Startup mount ;

Show parameter control_files

Query 1

select a.member,a.group#,b.status from v$logfile a ,v$log b where a.group#=b.group# and b.status='CURRENT'

Note down the name of the redo log

Shutdown abort ;

Take a OS Level back of the controlfile (This is to ensure we have a backup of current state of controlfile)

Startup mount ;

recover database using backup controlfile until cancel ;

Enter location of redo log shown as current in Query 1 when prompted for recovery

Hit Enter

Alter database open resetlogs ;

With database in mount stage

rman target /

rman> spool log to ‘/tmp/rman.log’;

Rman> list backup ;

Rman > exit

Keep this log handy

Go to sqlplus

Show parameter control_files

Keep this location handy.

oradebug setmypid

Alter session set tracefile_identifier='controlfilerecreate' ;

Alter database backup controlfile to trace ;

Oradebug tracefile_name ; 

–> This command will give the path and name of the trace file

Go to this location ,Open this trace file and select the controlfile recreation script with NO Resetlogs option

Shutdown immediate;

Rename the existing controlfile to _old —> This is Important as we need to have a backup of existing controlfile since we plan to recreate it

Startup nomount

Now run the Controlfile recreation script with NO Resetlogs mode

Alter database open ;

For database version 10g and above

Once database is opened you can recatalog the rman backup information present in the list /tmp/rman.log using

Rman> Catalog start with ” ;

Once the database has been opened using the option a or option b its recommended to take a hot backup of the database.
Same Steps are applicable to Rac if all instance are down with same error.

crash, database, fail, oracle, repair

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