| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
 |
 | |||
| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
|
| |||
Home -> Community -> Mailing Lists -> Oracle-L -> RE: controlling CPU usage through Oracle
If your purpose is to slow down query execution instead of killing a
query (or a process), then you cannot use resource profiles. Using
resource profiles you can only kill a statement execution or kill a
session. An OS resource manager might have a feature that just slows
down a CPU consumer but even if it did, how would you tell it not to
context switch a process holding a latch? If you're asking 'why would it
have to context switch the process', then the answer is 'what else could
it do with a cpu consumer'?
It's true that HPUX, possibly others, have worked with Oracle to prevent such a catastrophe. To use this new feature of Oracle/HPUX you have to migrate to 9i. Since you aren't on HPUX, then you're out of luck on that feature anyway. At least for now.
I could jump on a soapbox to discuss server consolidation vs. resource management but I'm sure that's a waste of time. Instead, we should discuss concurrent batch job management as it relates to these queries. If these individual queries response time is between 45 seconds and 2 minutes, then the processes that execute them should probably be considered batch jobs. And as such they should relent to being managed by a queue that prevents them from over consuming system resources per some unit of time. If they already relent to a manager, then the manager needs a refresher course on job scheduling.
Jeff Holt
Hotsos Enterprises, Ltd.
http://www.hotsos.com
Upcoming events:
- Hotsos Clinic <http://www.hotsos.com/training/clinic> , Oct 1-3 San
Francisco, Oct 15-17 Dallas, Dec 9-11 Honolulu
- 2003 Hotsos Symposium <http://www.hotsos.com/events/symposium> on
OracleR System Performance, Feb 9-12 Dallas
- Next event: Miracle Database Forum <http://www.miracleas.dk> , Sep
20-22 Middlefart Denmark
-----Original Message-----
Sent: Wed, Aug 28, 2002 08:13
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
You could use profiles to control CPU usage as well, more info is in manuals.
Raj
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.
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jeff Holt INET: jeff.holt_at_hotsos.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Wed Aug 28 2002 - 11:52:07 CDT
 |
 |