Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Mailing Lists -> Oracle-L -> raid 5 disaster

raid 5 disaster

From: Michael McMullen <ganstadba_at_hotmail.com>
Date: Thu, 12 Aug 2004 14:21:25 -0400
Message-ID: <BAY9-DAV17KFn4rQCWS00047e2f@hotmail.com>


Oracle 9.2.0.3
solaris 5.8
raid 5 T3's

I have a server which was created for adhoc purposes. What has happened is this. Instead of users running adhocs, they have created a package which creates tables (all logging of course) based on their adhoc query. The package then uses dbms_output.put_line to write the created table to a file which then ftp's the file to the appropriate client. Roughly 200 reports are written a day and most would be over 1 million lines and total file size would be ~10Gb. Of course everybody wants their report by 9:00 a.m so the box is routinely pegged at 60% i/o wait. So everybody is complaining about database performance. I have stated that

dbms_output was probably the worst way to implement this. As I recall
dbms_output will write out one line at a time. Now would the use of
dbms_output affect other ddl. A truncate of a small table can take 15
minutes. Or is that just a function of the i/o waits? I guess I'm looking for some really technical explanation as to why there performance is so bad.

Thanks
Mike



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

To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line.
--

Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
Received on Thu Aug 12 2004 - 13:21:25 CDT

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US