ORA-00023: session references process private memory; cannot detach session

ORA-00023: session references process private memory; cannot detach session

Cause: An attempt was made to detach the current session when it contains  references to process private memory.

Action: A session may contain references to process memory (PGA) if it has an  open network connection, a very large context area, or operating system  privileges. To allow the detach, it may be necessary to close the session"s database  links and/or cursors. Detaching a session with operating system privileges is  always disallowed.

Explanation:

1. If the session has an open network connection or a very large context area, you can try closing the session's database links and cursors.
2. If the session has operating system privileges, you will not be able to detach the session.