RE: controlling CPU usage through Oracle

[Cary Millsap]

Trying to accomplish it through the OS will do what you want on rare occasion, but on many other occasions, it will cause performance problems that will, for all outward appearances, seem to be deadlocks. The behavior will be random. There’s lots of discussion about this on the list from a few months ago (check the archive).   Cary Millsap Hotsos Enterprises, Ltd. http://www.hotsos.com Upcoming events: - Hotsos Clinic, Oct 1–3 San Francisco, Oct 15–17 Dallas, Dec 9–11 Honolulu - 2003 Hotsos Symposium on Oracle® System Performance, Feb 9–12 Dallas - Next event: Miracle Database Forum, Sep 20–22 Middlefart Denmark -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Ed Lewis Sent: Wednesday, August 28, 2002 8:13 AM To: Multiple recipients of list ORACLE-L Subject: Re: controlling CPU usage through Oracle   Raj,     Thanks for your input. From what I understand with profiles, the session will be terminated once a threshold is reached.     In this particular case, I cannot terminate the session. I need to be able to control the CPU usage of a session, without ending it.      If this cannot be done within Oracle, then maybe it can be accomplished through the OS.           thanks.                         ed                       ----- Original Message ----- From: Jamadagni, Rajendra To: Multiple recipients of list ORACLE-L Sent: Tuesday, August 27, 2002 4:48 PM Subject: RE: controlling CPU usage through Oracle   You could use profiles to control CPU usage as well, more info is in manuals.   Raj ______________________________________________________ Rajendra Jamadagni              MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com Any opinion expressed here is personal and doesn't reflect that of ESPN Inc. QOTD: Any clod can have facts, but having an opinion is an art! -----Original Message----- From: Ed Lewis [mailto:[EMAIL PROTECTED]] Sent: Tuesday, August 27, 2002 4:18 PM To: Multiple recipients of list ORACLE-L Subject: controlling CPU usage through Oracle Hi,     I'm looking for a way to control CPU usage of particular queries on a database.     After exploring, and implementing ways of optimizing the code, these queries can run anywhere from 45 seconds to 2 minutes.      This database is 1 of 5 on this box. So, although it's important to build effective queries, it's also important in this environment that these queries do not impact the other 4 databases.     What I want to do is place a limit on CPU usage without terminating the query. I've looked at profiles with the "cpu_per_call" and "cpu_per_session" settings. I have never used profiles, but from what I understand, these will kill the session once they reach a threshold.     I'm also looking at database resource management. This may be more appropriate for this situation.     Has anyone used this, and if so what are you experiences ? Would you recommend it ?     Would the only way to control CPU usage on this box, be through the operating system ?   I welcome any suggestions. I appreciate your time.   The environment is Oracle 8.1.7.2, AIX 4.3.3.