To add an example of what Anjo, Morgens and everyone else is talking about,
here is a perfect illustration of why focusing on BCHR is like
concentrating intensely on how fast your tyres rotate in a Tour de France,
instead of looking of where you are going (probably a lot more useful).
Another example:
If I raced (100M sprint) against Maurice Green, and he went off in the
wrong direction, despite the fact that he is so much faster than me (duh !)
, I could lightly jog (as if I have anything else to offer) the 100M in the
right direction and beat him. Well, focusing on BCHR alone is like going at
full tilt with no direction.
Also, I have realized that cars have been around for > 100 years now, so
why exactly would I want to sprint again ? :-)
Check out this example:
run any number of scripts to look at BCHR. Then run the following anonymous
PL/SQL block:
declare
jackass number;
begin
for jackass in 1..10000000 loop
execute immediate 'select count (*) from solvit.solvit_lic ' ; --
replace this table with any single row table you like.
end loop;
end;
/
Check your BCHR again. Wow, amazing ! How much better your BCHR looks now.
This must be magic. If you would like to purchase other such tools, please
feel free to drop me a line, I could also sell you a large iceberg, which
would end your personal water restriction problems.
Another advantage to the above code is that it eliminates idle capacity
from my CPU's (I paid for the thing, it should be put to work, right ? ) as
my laptop has been at 100% CPU utilization for the last 8 minutes as I let
this piece of crap run before I killed it (Oracle 9 on XP with 512 MB RAM
[SGA 120 MB], with a bunch of other starved stuff running concurrently).
Reduction of logical I/O : Now THERE is the holy grail worth pursuing ! I
am sure we could have a VERY interesting discussion on that one !
Feel free to use the above example to prove for once and for all that
concetration on tuning BCHR alone is a fruitless exercise.
Regards :
Ferenc Mantfeld
-----Original Message-----
From: Rachel Carmichael [SMTP:[EMAIL PROTECTED]]
Sent: Monday, January 13, 2003 11:24 AM
To: Multiple recipients of list ORACLE-L
Subject: Re: BCHR Tuning
and those people "sell a tuning tool".... hm, I hadn't noticed any
selling going on here. Or perhaps it's been subliminal?
--- Jared Still <[EMAIL PROTECTED]> wrote:
> On Friday 10 January 2003 14:48, Mogens Norgaard wrote:
> > Obviously, we don't know what we're talking about. I can see
> there's a
> > presentation by Rich Niemich at IOUG-A where he'll address all
> those
> > idiots who are saying you should ignore the Cash Hit Ratio (and who
> are
> > all just after making big money on their products - I loved that
> one).
> > > Or modify the set up of these tools to take action when BCHR
> falls......
> > >
>
> Here's the session info:
>
> Date: Mon, Apr 28, 2003 @ 11:45 AM - 12:15 PM
> Venue: Southern Hemisphere 2, Walt Disney World
> Dolphin, Lake Buena Vista, FL
>
> Abstract: Lately, there has been a big push to ignore your
> hit ratio with claims that it is meaningless. This shallow
> minded view (usually by people who sell a tuning tool) ignores
> why people look at hit ratios and what they are looking for.
> This quick tip talk will show you what to look for and why.
> You will definitely know when, where & why to look at your
> hit ratio in the future.
>
> Show you why your hit ratio matters. How to analyze the
> hit ratio. Fallacies by those who want to sell you products
> and tools instead.
>
>
> Shallow Minded ?!
>
> Jared
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Jared Still
> INET: [EMAIL PROTECTED]
>
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--
Author: Rachel Carmichael
INET: [EMAIL PROTECTED]
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Author: mantfield
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