Re: Buffer cache hit very low...!!!

  • From: Jared Still <jkstill@xxxxxxxxx>
  • To: chiragdba@xxxxxxxxx
  • Date: Tue, 13 Sep 2005 13:54:24 -0700

On 9/13/05, Chirag DBA <chiragdba@xxxxxxxxx> wrote:
> Did someone mean that RATIOS are absolete now and those should not be
> considered now. 

They are not *completely* useless, but they do not tell you much.

Some ratios are less useless than others - this is just about the DBCHR.

If your DBCHR (database cache hit ratio) is unusually low, it tells
you that something may be different.

Or it may just mean you've never seen it that low because you observed
it at the wrong time.

Or it may mean nothing at all.

The DBCHR does not give you any idea what on your database needs
to be corrected, or even *if* anything needs corrected.

This is more of an advanced topic.  You need to learn how Oracle works
before delving into this.

If your users are happy, don't worry about fixing things that probably
are not broken.  :)

Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist
11+ years of trying to appear to know what I'm doing.

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