Hi, 1. Can you provide the database version ? - ThanksPavan Kumar N From: Mostafa Eletriby <dmarc-noreply@xxxxxxxxxxxxx> To: Oracle-l Digest Users <oracle-l@xxxxxxxxxxxxx> Sent: Sunday, 30 November 2014 4:25 PM Subject: ORA-00600: internal error code Hello DBAs,I have a problem regarding Ora-600 error at Alert log file.It appears regularly at alert log file and stops database and needs to re-open database.Please tell me which procedures that I should follow in order to solve the problem. Database has no previous backup taken.Database was in no archive mode before problem happened but now it is switched to archive log mode ------------------------------------SQL> recover database;ORA-00283: recovery session canceled due to errorsORA-01124: cannot recover data file 1 - file is in use or recoveryORA-01110: data file 1: '/oraData/cdsdb/system01.dbf' Please advice me. ThanksRegards,