All I have some more information on this. I turned on event 10046 on this. From this I was able to note the following...
1. I start the sql script and spool the results 2. It waits for less than a second on "process startup" and "PX Deq: Join ACK". I think these are waits for starting up the parallel query slaves and then they acknowledging the startup. 3. Then it starts waiting on "PX Deq Credit: need buffer" and "PX Deq Credit: send blkd". I think these are when PQ actually returns data to the QC 4. Then it starts witing on "PX Deq: Execute Reply". I see numerous waits on this. I am not sure on what this wait means. 5.After two hours, it starts waiting on "PX Deq: Table Q qref" and "SQL*Net message to client". By this time, it has finished writing to the spool file. I verified this from the unix timestamp. The trace also shows "FETCH #1:c=0,e=0,p=0,cr=0,cu=0,mis=0,r=15,dep=0,og=4,tim=57419669" 6. After about 3-4 hours later the SQL prompt returns to me. During this time it has not written to the spool file. So I am not sure what is being done in this time... What is it doing during the Step5 desciribed above? Also why does it show "Fetch" when I have already gotten the data.. Can any of you pl comment on the above... Am I missing anything or am I interpreting it wrong... Thanks a lot Babu ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Thursday, April 11, 2002 4:03 AM > > 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) > or > 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 <[EMAIL PROTECTED]> > 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 > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > -- > Author: Jonathan Lewis > INET: [EMAIL PROTECTED] > > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 > San Diego, California -- Public Internet access / Mailing Lists > -------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (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). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Babu Nagarajan INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (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).
