There is a basic issue with DB2 statistics for CPU - they start with the first SQL statement. Everything that happens before that is not recorded in the DB2 cpu times. This is WAD. There used to be some presentations on what was included in DB2 cpu and why. I haven't looked for them in a long time. Maybe someone on DB2 listserv has a better memory or keeps better notes.
Mike On Thu, Aug 8, 2013 at 8:39 AM, Charles Mills <charl...@mcn.org> wrote: > Do you know that there is a DB2-specific mailing list where lots of > serious DB2 performance heavyweights hang out? > > I believe the enrollment process is to go to www.idug.org and "join" IDUG. > > Charles > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On > Behalf Of Nguyen Duc > Sent: Thursday, August 08, 2013 3:45 AM > To: IBM-MAIN@LISTSERV.UA.EDU > Subject: Differences between CPU values from SMF30 and DB2 stats > > Dear all, > > I am a DB2 specialist , doing some measurements i just noticed that there > is a noticeable difference between DB2 CPU times i got from SMF30, and the > times i got from the DB2 statistics records (SMF100) about the CPU > consumption of DB2 address spaces. I submitted the question to various > performance specialists at IBM (authors of presentations at CMG ...) but > none of them noticed this before. > This is the second MVS site that i notice the differences , so i don't > think that there is a bug behind that. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- Mike ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
