RE: controlling CPU usage through Oracle

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

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-----Original Message-----
Sent: Wednesday, August 28, 2002 8:13 AM To: Multiple recipients of list ORACLE-L  

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 -----

To: Multiple <mailto:ORACLE-L_at_fatcity.com> recipients of list ORACLE-L

Sent: Tuesday, August 27, 2002 4:48 PM  

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-----
Sent: Tuesday, August 27, 2002 4:18 PM
To: Multiple recipients of list ORACLE-L

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.  

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