raid 5 disaster

  • From: "Michael McMullen" <ganstadba@xxxxxxxxxxx>
  • To: <oracle-l@xxxxxxxxxxxxx>
  • Date: Thu, 12 Aug 2004 14:21:25 -0400

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@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
-----------------------------------------------------------------

Other related posts: