(U) RE: RE: Hit Ratio

CLASSIFICATION: UNCLASSIFIED Rich,

Burn any source that talks about hit ratio's.

What exactly is running slow in your system and at what times ?

Talk directly to the user that is experiencing the slowdown and ask them to repeat the behavior.

Set a 10046 trace and go find the slowdown while the user is executing the application.

Use the wait interface to determine what the culprit is.

Lots of good books out on this stuff now.

Is any batch job running at this time ?

-----Original Message-----
Sent: Monday, December 22, 2003 11:49 AM To: Multiple recipients of list ORACLE-L

i dont think many people are using bchr anymore. I think its been talked down to death. only place I hear about it is offshore. people still using the old niemic book. his new took all that stuff out.

or am i wrong?
>
> From: "Jesse, Rich" <Rich.Jesse_at_qtiworld.com>
> Date: 2003/12/22 Mon PM 02:14:26 EST
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Subject: RE: Hit Ratio
>
> My BCHR is currently 96.62%. In the past, it was normally over 99%. What
> should I do?
>
> I'll be waiting for Mladen's reply... :)
>
>
> Rich
>
> Rich Jesse System/Database Administrator
> rjesse_at_qtiworld.com Quad/Tech Inc, Sussex, WI USA
>
>
> -----Original Message-----
> Sent: Monday, December 22, 2003 10:14 AM
> To: Multiple recipients of list ORACLE-L
>
>
> As a friendly reminder, when debunking myths, I suggest we keep sober and
> never
> go overboard. The recently popular formula to get an arbitrary hit ratio
is
> not
> what a database in normal usage naturally gets. Unless a mischievous
> developer
> plays a prank, hit ratios are still useful to some extent in checking
> database
> health, although other indicators such as wait events should be given a
> greater
> weight.
>
> Yong Huang
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Jesse, Rich
> INET: Rich.Jesse_at_qtiworld.com
>
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Classification: UNCLASSIFIED

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Author: Johnson, Michael 
  INET: Michael.Johnson_at_oln-afmc.af.mil

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