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:[EMAIL PROTECTED]] > 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 > [EMAIL PROTECTED] > > > > ----- Original Message ----- > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > 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? > > > > __________________________________________________ > > Do You Yahoo!? > > Yahoo! Health - Feel better, live better > > http://health.yahoo.com > > -- > > Please see the official ORACLE-L FAQ: http://www.orafaq.com > > -- > > Author: Johnson Poovathummoottil > > INET: [EMAIL PROTECTED] > > > > 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: [EMAIL PROTECTED] (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). > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > -- > Author: Igor Neyman > INET: [EMAIL PROTECTED] > > 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: [EMAIL PROTECTED] (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). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Gogala, Mladen INET: [EMAIL PROTECTED] 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: [EMAIL PROTECTED] (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).
