Error Occur in Select Query (ORA-00600)

Question

Sir,
     I have problem about oracle (select query). I was write select query and it is working some time and some time not working. Error has display as following:
Select Query:- Select DISTINCT BatchNumber from tabname where recdate Like '20111101%' AND OptCode='Datta';

Error:- ORA-00600; internal error code, arguments: [kdiss_pin_hdr: too many], [], [], [], [], [], [], []

Why this error occur in select query.

Please give me reply ASAP.

Thanks.