Hello KP_CA,
I see you just joined the community, so welcome to the community.
In regards to your question, I have a few of my own:
1) Is this a new install, or an existing implementation?
2) if it is a new install, did you properly size the environment properly (RAM, CPU, DISK, etc), using the right version of Oracle.
3) Did this just start occurring? If so, have you recently done an upgrade? changed settings? done changes on the server? etc?
4) How long was it running before you had this problem?
Regards,
Mike