Hi. I have a strange situation namely that a user process is waiting on event PX Deq: Execute Reply. Besides this event I have 2 parallel query processes waiting PX qref latch and 2 processes on PX Deq: Execution Msg I have never enabled parallel query option and I checked all parameters again and did not find any clue in those. Any idea what might be causing this? Regards, Jeroen ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------