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From: Robert Dewar <robert_dewar@my-deja.com>
Subject: Re: Looking for keyed file package
Date: 1999/09/24
Message-ID: <7seobv$7ib$1@nnrp1.deja.com>#1/1
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 <7scrba$bdu$1@clnews.edf.fr> <7semeb$69u$1@nnrp1.deja.com>
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In article <7semeb$69u$1@nnrp1.deja.com>,
  Robert Dewar <robert_dewar@my-deja.com> wrote:
> In article <7scrba$bdu$1@clnews.edf.fr>,
>   p.obry@der.edf.fr wrote:
> > I do not agree here. For example for Information Retrieval a
> relational DB
> > is not well suited at all.
> >
> > You need to have very quick access (and walk through) to
> inverted index
> > file.


One thing to be aware of here is that a naive implementation of
indexed files may well be slower than using a database built on
top of a sophisticated indexed file system.

It is quite surprising what can be done with good indexed
file systems. For example, the Realia COBOL compiler uses a
sophisticated form of leading/trailing key compression which
results in an average stored key length of about 16 bits,
regardless of the actual physical key length.


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