What I'd do first would be to profile the httpd processes by compiling
Apache
and Tomcat with "-g" flag (for gcc) and then use gprof, pixie, hrprof or
oprofile
on the resulting output files. Oracle is not compiled with "-g", so
profiling
will stop when it encounters a routine from libclntshr.so, i.e. it will not
descend into the routine itself.
The resulting execution profile will tell you where what is your server
process
waiting on. If it's Oracle, then go in the database and fix the database
stuff
(v$system_event,v$session_event and v$session_wait). On the other hand, it
may
be a JVM that is linked into the Tomcat (it has a gazillion or two options
available
for tuning/messing and I haven't figured any of them yet). It may even be a
commyunication part, in which case, I'd check wires, ropes, NICs and
routers.
> -----Original Message-----
> From: Igor Neyman [mailto:ineyman_at_perceptron.com]
> Sent: Wednesday, July 31, 2002 4:56 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: extremely high number of executions
>
>
> Your developers aren't unique :-)
>
> personally, I don't see any evildoing in caching some stuff
> on the client
> side.
>
> Igor Neyman, OCP DBA
> ineyman_at_perceptron.com
>
>
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Wednesday, July 31, 2002 4:24 PM
>
>
> > Hi All,
> >
> > We have an application which executes one sql
> > statement more than 10 million times a day. Everything
> > is good about the sql, well tuned, uses indexes, parse
> > only once, etc. The number of concurrent users in this
> > database seems to around 60, but we see an average
> > 1500 executions/sec.
> >
> > We questioned the developers about the sql as we had
> > seen 80% to 95% latch sleeps on library cache
> > constantly. They seem to be hitting the database every
> > time a page is refreshed instead of storing the
> > retrieved data some where for later use.
> >
> > The developers are of the opinion that cookies and
> > session variables are considered "the much
> > detested and reviled Satan and Lucifer of all
> > "stateful" web apps".
> >
> > Any comments/opinion?
> >
> > __________________________________________________
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> > http://health.yahoo.com
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Johnson Poovathummoottil
> > INET: joni_65_at_yahoo.com
> >
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Igor Neyman
> INET: ineyman_at_perceptron.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Gogala, Mladen
INET: MGogala_at_oxhp.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
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Received on Wed Jul 31 2002 - 17:00:18 CDT
