Re: buffer hit cache ratio

Tuning by the BCHR is not done by today's top Oracle professionals. As you've noticed, your BCHR may be "sub-optimal", i.e. less than 95% (or whatever number you want to put in there) and yet your performance is just fine. If you want a higher BCHR, see the following script:

http://www.oracledba.co.uk/tips/choose.htm

With it, virtually any "good" BCHR is obtained and yet application performance hasn't changed.

Today, many top Oracle professionals use the V%DB_CACHE_ADVICE view in Oracle 9i and the Oracle Wait Event interface to determine if the buffer cache is the bottleneck to performance.

HTH,
Brian

Tom Brown wrote:
>
> What is an acceptable hit ratio?
>
> currently i have about 84% and although the performance is fine i'm curious
> if i can make it better?
>
> thanks

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