Oracle-L: Re: PX Deq: Table Q qref

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Thu, 11 Apr 2002 01:03:30 -0800
Message-ID: <F001.00441630.20020411010330@fatcity.com>

Not entirely sure, but I think this is a query slave trying to make, or break a link from another layer in the DFO.

As the query gets to completion, I would expect to see the QC gathering results, and the slaves either in:

    PX Deq Send Blkd      (i.e. more data to send
        but another slave is currently passing data
        to the QC)

PX Deq Execution message (roughly, this is from memory) which means all its data has been transmitted and it is waiting for a message from the QC to tell it to die.

Jonathan Lewis
http://www.jlcomp.demon.co.uk

Host to The Co-Operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html

Author of:
Practical Oracle 8i: Building Efficient Databases

-----Original Message-----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: 10 April 2002 18:05

All

What does this wait event mean? I have a process that connects to the database through ODBC and this process is waiting on this event and SQL*Net message from client.

Often this process waits for an unreasonable amout of time (40000 seconds or more) on SQL*Net MEssage from client and PX Deq: Table Q qref before it successfully completes...

TIA Babu

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Author: Jonathan Lewis
INET: jonathan_at_jlcomp.demon.co.uk

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