RE: Correct way to accuse BCHR tuning method (Was: Hit ratio)

> -----Original Message-----
> From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com] On
> Behalf Of Ryan
> Sent: 27 December 2003 21:59
> To: Multiple recipients of list ORACLE-L
> Subject: Re: Correct way to accuse BCHR tuning method (Was: Hit ratio)
>
>
> Performance 'problems' are dependent on what the marketing
> department gets in the SLA.
>
> So if your marketing guys negotiate very strict response time
> requirements and you dont meet them, then you have a
> performance problem. How do I know if my buffer cache is
> having any effect on that?

Build a profile of what the app is doing. If it is spending a significant proportion of its time waiting on physical IO then *maybe* your cache is badly sized (most likely you are doing too much IO though). Even here though (and in my experience others may have different views) your first target will be to reduce the IO before you throw memory at the problem.

Niall

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Author: Niall Litchfield
  INET: niall.litchfield_at_dial.pipex.com

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