Respected Friends

I am getting this particular in my database and after that my database use to struck :

This error comes in SMON Trace File.

SMON Parallel Transaction Recovery Slave Got Internal Error
Downgrading Transaction Recovery To Serial.
Ora-00600, Internal Error Code , Arguments {4142},{268435459)

After this database got struck. This error comes after every Second.

Please help me out in this regard.

Regards

Gurpreet Singh Sethi