Re: quick suggestions for tuning ?

I would say that is often the norm.

I would not say that it is however desirable.

What you need to do is ask yourself "What is the benefit of re-reading the data in the buffer over and over?"

When a database has a high Buffer Hit Ratio it will also have a large number of LIO's, and the reason is poorly written SQL that reads the same data from the cache, over and over.

There papers at hotsos.com that will explain this in detail.

Jared

Prem Khanna J <jprem_at_kssnet.co.jp>
Sent by: ml-errors_at_fatcity.com
 08/12/2003 03:44 AM
 Please respond to ORACLE-L  

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        Re: quick suggestions for tuning ?

Jared,

LIO being high and BHCR ~ 99% : is this is a normal or abnormal ?

Regards,
Jp.

12-08-2003 00:44:23, Jared Still <jkstill_at_cybcon.com> wrote:
>But his BCHR is 99.57% !

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Prem Khanna J
  INET: jprem_at_kssnet.co.jp

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
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).




-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: 
  INET: Jared.Still_at_radisys.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
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).