This is what happens when I try to query as DBA:

SQL*Plus: Release 11.2.0.1.0 Production on Mon Nov 10 22:28:00 2014

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Enter user-name: sys as sysdba
Enter password:

Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select count(*) from dba_users;

select count(*) from dba_users
*
ERROR at line 1: ORA-01219: database not open: queries allowed on fixed tables/views only

SQL> alter database open;

alter database open
*
ERROR at line 1: ORA-00600: internal error code, arguments: [kcratr_nab_less_than_odr], [1], [824], [95], [98], [], [], [], [], [], [], []

please help to restore my db...