searching for search

[Rich Singer]

> > > - if all i wanted to do was boolean search on field values with
> > > no stemming/concept support, then regardless of how i did the
> > > indexing, what is wrong with using standard b-trees and/or just
> > > putting the index data in a sql db?
> > To make the answer short: depends upon what you want to do.
> A slightly longer answer is, if you have 100GB of data that you want
> to index in an SQL database then you'd better grab a terabyte of hard
> disk and be prepared to wait a LONG time for your queries to come back
>to you.

There are indexes which will be significantly smaller than the source data.
An example is a bitmap index on data with duplicate values.  Commercial
examples of this can be seen from Sybase IQ, Broadbase and Oracle.  A form
of bitmap index would probably work very well with some types of XML
information.

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