Re: METALINK and OWS

Nicholas,

Also do remember that Oracle creates indexes to enforce primary/unique key constraints.

P.S.
OK Jared, what does ROFL stands for?

Jared Still wrote:

> ROFL!
>
> ' But Rachel Carmichael said to drop them! '
>
> Jared
>
> On Sun, 11 Jun 2000, Rachel Carmichael wrote:
>
> > WHOA! Slow down before you drop the indexes. Indexes are not totally
> > useless! It very much depends on the queries you run against your database.
> > If you are doing a mixture of queries, where some return single rows or a
> > very small subset of data, and some return a large number of rows, you still
> > should keep the indexes for the first type of query.
> >
> > Rachel
> >
> >
> > >From: Nicholas Tufar <ntufar_at_chemist.gen.tr>
> > >Reply-To: ORACLE-L_at_fatcity.com
> > >To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > >Subject: Re: METALINK and OWS
> > >Date: Sun, 11 Jun 2000 14:17:51 -0800
> > >
> > > >
> > > > Nicholas,
> > > >
> > > > Sorry... I thought most people knew this. Oracle says that if a query
> > >will
> > > > return more than 20% of the rows of a table, it will use a full table
> > >scan.
> > > > So you DON'T tune it to use an index. In fact, as of 8i, I believe
> > >Oracle
> > > > now recommends that if a query returns as little as 3-5% of a table, a
> > >full
> > > > table scan is the way to go.
> > >
> > >A very valuable piece of information. How did I miss it!
> > >Now I know what I am going to do on Monday. I had a feeling that
> > >all those indeces are useless, now I know why they are.
> > >Thank you very much.
> > >
> > >Nicholas
> > >--
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