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Home -> Community -> Mailing Lists -> Oracle-L -> Re: ioug-a question
This is from grandpa's memory:
The wait interface (v$system_event, v$session_event, v$session_wait) were introduced in 7.0.12. So if my memory works correctly at this early hour, that was 1992. In 1995, I wrote the Oracle7 wait events and enqueue paper, after Jeff Needham explained a couple of events in the 7.1/7.2 performance and tuning guide. I saw that and decide that we need to do them all. In 1996 I got involved in tuning one of the largest Oracle installations in the world and had to convince the developers that they were doing the wrong thing. So I came up with YAPP (actually even to day that site is still using the initial scripts that we developed for them based on YAPP). I also started to give talks about this way of tuning, I gave talks to support and consultant goups (1997 and later). Then some one in support decided that a white paper was needed and that became the YAPP white paper, published 1998.
So a couple of dates and names:
1992 - Juan Loaiza (designed the wait interface)
1994 - Jeff Needham (documented 4/5 events in the performance and tuning guide
of 7.1/7.2)
1995/1996 - Oracle7 wait events and enqueue papers (Anjo Kolk)
1996 - YAPP developed onsite at one of the largest OLTP OPS sites in the world
1997/1998 - people insite of Oracle are getting exposed to the wait interface
tuning (Mogens Norgaard, Cary Millsap, Shari Yamaguchi)
1998 - white paper was published 1998 - oraperf website 2000 - other companies start to work with the wait interface (Hotsos/Miracle) 2001 - a lot of books are published with wait interface / YAPP methodology 2003 - Richard Niemic rewrites his book and throws out the buffer cache hitratio and introduces the wait interface, like it was invented yesterday ;-)
A couple of things that I have noted over the years:
Watch this space, as things will evolve over the next couple of months/years !
Anjo.
Jared Still wrote:
> Nice post. The 'revolution' is indeed not that new, more
> of an underground guerilla movement.
>
> And it wasn't televised. :)
>
> Jared
>
> On Sunday 21 April 2002 10:33, Don Granaman wrote:
> > There seems to be a lot of interest in the "tuning revolution" here, so...
> >
> > The basics revolve around the views v$system_event, v$session_event, and
> > v$session_wait, and v$event_name - and the 10046 event. Rather than try to
> > paraphrase/summarize/expound upon the details, here are some of the best
> > sites for researching the topic. (I'm sure there are other excellent
> > issites, but these are the ones I know about that most certainly qualify.)
> >
> > Historical note: A year ago at the IOUG-A conference, this was considered
> > "revolutionary". This year it was the most widely presented and discussed
> > topic at the conference. In fact, the technique has been around for a long
> > time, it just wasn't widely known or accepted. My initiation to it was
> > after an Oracle consultant came out and left something called APS7
> > installed on an Oracle7 system - in 1997! (Aside: Did APS8 ever exist?).
> > APS7 was written by Milsap's group at Oracle and some of it uses wait-based
> > tuning techniques. Poking around and looking at the scripts opened the
> > door to profound revelation.
> >
> > Motivational scenario: Cast: DBA (you) and PHB (Pointy-haired boss)
> > PHB: "This tuning report (or GUI tool) shows the cache-hit ratio as too
> > low. You should tune the database"
> > DBA: "That is to be expected. Batch manipulated 100 GB of data last night.
> > Cache-hit ratio is a meaningless metric anyway."
> > PHB: "But this book says it should be > 95%. Besides, we are on the
> > English system - we don't use metric!"
> >
> > www.oraperf.com - Anjo Kolk
> > Anjo Kolk's YAPP paper (a pioneering work on the topic). Consider it as
> > prerequisite background reading and the departure point for your journey.
> >
> > www.hotsos.com - Cary Milsap
> > Requires (free) registration. Click on "Knowledge On-line". There are
> > acres of papers here that are at the core of modern tuning techniques,
> > including "Oracle Kernel Event Documentation Index", "Oracle System
> > Performance Analysis Using Event 10046", Why 99% Database Buffer Cache Hit
> > Ratio is NOT OK", "Performance Management Myths and Facts", "Why You Shoud
> > Focus on LIOs Instead of PIOs", ad infinitum...
> >
> > www.orapub.com - Craig Shallahamer
> > Requires (free) registration. Click on "Technical Papers" at the top .
> > Related items include #149 - Gaja's "Myths & Follore...", #134 -
> > Beresniewicz's "Pirahnas in the Pool", and #113 = Shallahamer's "Direct
> > Contention Identification...". There are several others related to
> > wait-based tuning also.
> >
> > www.miracleas.dk - Miracle A/S (Mogens Nørgaard, Bjørn Engsig, et al)
> > Click on "Technical Information". Anjo Kolk's YAPP paper is also available
> > here, as is the Miracle Monitor, and some other good stuff. (Mogens has
> > the reputation of first saying, in public at least, that "Ratios are for
> > losers!")
> >
> > www.ixora.com.au - Steve Adams
> > Tons of stuff related to wait-based tuning - far too much to list.
> >
> > www.evdbt.com - Tim Gorman
> > Click on "Download" at the bottom, in the middle. I don't see any papers
> > specifically on the topic, but there might be soon - he did a full day
> > seminar on advanced diagnostics at IOUG-A Live 2002 where the basics of
> > wait-based tuning were covered in detail. A number of the scripts (e.g.
> > sesstime.sql, systime.sql, etc.) are directly related.
> >
> > www.jlcomp.demon.co.uk - Jonathan Lewis
> > Under "Index of Topics" -> "Monitoring and Tuning" -> "Tuning" ->
> > "v$sytem_event" ... and probably other places on the site...
> >
> > Note that many of these people are active participants in ORACLE-L. Hotsos
> > (Milsap) and OraPub (Shallahamer) both offer training in these techniques.
> > Also, another esteemed list member, Kirti Deshpande, did an excellent
> > "Quick Tips" session on identifying wait events at IOUG-A 2002.
> >
> > Don Granaman
> > [OraSaurus - Honk if you remember UFI !]
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Jared Still
> INET: jkstill_at_cybcon.com
>
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Anjo Kolk INET: anjo_at_oraperf.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 Mon Apr 22 2002 - 02:13:19 CDT
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