Hi Neeraj -

Read this metalink document.

https://metalink2.oracle.com/metalink/plsql/f?p=130:14:4915267154733559501:::14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,316889.1,1,1,1,h elvetica

Thanks,