database not opening While altering a DB to open getting the below error.

SQL&gt; alter database open;
alter database open
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [kcratr_nab_less_than_odr], [1],
[344], [73], [125], [], [], [], [], [], [], []
Please provide further details about what happened previously. Did a hardware failure occur? Also, refer to the .trc files that generally follows ORA-00600 errors in alert.log. If you're on linux and made a default installation, alert log will probably be located at $ORACLE_BASE/diag/rdbms/sid/sid/trace. It contains the main DB events, and it's the first approach while diagnosing Oracle Failures.