Mary,

Here you go with the metalink doc that gives detailed explaination. If you still have Q`s , post 'em in forum.

[url]http://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=40689.1[/url]

[Edited by sreddy on 01-04-2001 at 09:29 AM]