AQ query from dequeuw procedure not using index -URGENT

From: orafaq <shgarg_orafaq_at_hotmail.com>
Date: Mon, 09 Dec 2002 10:03:56 -0800
Message-ID: <F001.00515670.20021209100356@fatcity.com>

All,

We are using a third party application (Retek Warehouse management) which uses AQ as communication mechanism between processes. The problem we are facing is that the AQ query behind Dequeue is doing a full tablescan on queue table which is causing about 5Billion logical reads/day and is bringing the DB to its knees.

Following is the query which I gleaned from tracing the process

select /*+ FIRST_ROWS */ qt.rowid, qt.msgid, qt.corrid, qt.priority, qt.delay, qt.expiration, qt.retry_count, qt.exception_qschema, qt.exception_queue, qt.chain_no, qt.local_order_no, qt.enq_time, qt.time_manager_info, qt.state, qt.enq_tid, qt.step_no from PAR3214.GENERICTCP qt where q_name = :1 and state = :2 order by q_name, state, enq_time, step_no, chain_no, local_order_no for update skip locked

The procedure call is following
DBMS_AQ.DEQUEUE( 'par3214.' || qname, queueopts, msgprops, msg_obj, msgid );

Since this is an internal query, I can not change the HINT ( Itested that removing the hint drops logical reads from 2400 to 3).

Any ideas?

Thanks
Shaleen

--

Please see the official ORACLE-L FAQ: http://www.orafaq.com
--

Author: orafaq
  INET: shgarg_orafaq_at_hotmail.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------

To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Mon Dec 09 2002 - 12:03:56 CST