RE: Estimating User Load on the system

From: John Kanagaraj <john.kanagaraj_at_hds.com>
Date: Mon, 14 Jul 2003 09:55:02 -0700
Message-Id: <25920.337676@fatcity.com>

Raj,

Assuming that these users will logoff normally (for the most cases), you could have a database level LOGOFF trigger that captures the following 'stats' from these sessions (out of v$MYSTAT):

CPU used by this session (Cpu time used) user commits (Number of transactions - figuratively!) physical reads + physical reads (direct, lob, etc.) + db block changes
(former is reads, latter is the number of changes that would cause writes on
behalf of that process for Log, Undo and DBFile) session pga/uga memory max (Memory usage) SQL*Net roundtrips to/from client and dblink (Network usage)

Collect and summarize system wide (via STATSPACK) and for individual users via LOGOFF just to compare.

John Kanagaraj
Oracle Applications DBA
DBSoft Inc
(W): 408-970-7002

Disappointment is inevitable, but Discouragement is optional!

The opinions and statements above are entirely my own and not those of my employer or clients **

-----Original Message-----
From: Jamadagni, Rajendra [mailto:Rajendra.Jamadagni_at_espn.com] Sent: Monday, July 14, 2003 10:14 AM
To: Multiple recipients of list ORACLE-L Subject: RE: Estimating User Load on the system

Thanks Dennis,

I have periodic (10 mins) snapshots taken of following views ...

gv$session
gv$sesstat
gv$transaction
gv$sess_io
gv$sysstat

Now, I really _can't_ use Statspack, because it tells me overall score. I need to compute the load put on system by a set list of users ... it is kind of computation of possible charge back.

So, I have the underlying system stats. but I am having tough time to put them in perspective for management types. I'd like to show them %CPU usage, %IO load, %Memory being used ...

any ideas?
Raj

Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

-----Original Message-----
From: DENNIS WILLIAMS [ mailto:DWILLIAMS_at_LIFETOUCH.COM <mailto:DWILLIAMS_at_LIFETOUCH.COM> ]
Sent: Monday, July 14, 2003 12:49 PM
To: Multiple recipients of list ORACLE-L Subject: RE: Estimating User Load on the system

Raj

I'll second Jared's idea. Don Burleson in his book Oracle9i High-Performance Tuning with STATSPACK makes a strong point that looking at system load must start with the underlying system. Any look at Oracle performance must begin with an understanding of what the system load was at that time. As Jared points out, the three components are CPU, I/O, and memory. For example, you may find that one of these target users is the high

CPU consumer from an Oracle perspective at a point in time. Now, if you discovered the system CPUs weren't being taxed at that time your conclusions

might be different than if you discovered the system CPUs were pegged at 100% at that time.

Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Monday, July 14, 2003 10:19 AM
To: Multiple recipients of list ORACLE-L

Load on a system is in general comprised of three components: CPU, memory and IO.

If you have something in place to track those on a per user basis, then you're doing well. You might consider also tracking other users, so that you have a basis for comparison.

Jared

On Monday 14 July 2003 07:04, Jamadagni, Rajendra wrote: > I have been asked to compute the load put on the system by a 'select group

> of userids'. I know these users and have put something in place where I 
> sample periodically following 
> 
> 1. session stats 
> 2. session io 
> 3. system stats 
> 4. number of sessions 
> 5. v$transaction 
> 
> Am I missing something? Has anyone done this before?  If so, what have you

> computed ? 
> 
> TIA

> Raj
>

>- ---- 
> Rajendra dot Jamadagni at nospamespn dot com 
> All Views expressed in this email are strictly personal. 
> QOTD: Any clod can have facts, having an opinion is an art !

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Received on Mon Jul 14 2003 - 11:55:02 CDT