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

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Received on Thu Aug 12 2004 - 13:21:25 CDT