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Subject: Indexing derived data
Date: Wed, 2 Nov 2005 14:37:11 +0100
Message-ID: <A955EA1F8FE31749AEC8C998082F6C7C41A869@hai01.hippo.local>
Thread-Topic: Indexing derived data
Thread-Index: AcXfsoccVQD6PGsQT1CuI9udIrmndg==
From: "Max Pfingsthorn" <m.pfingsthorn@hippo.nl>
To: "Lucene User \(E-mail\)" <java-user@lucene.apache.org>

Dear fellow users,

I was wondering if anyone is using Lucene right now to index data =
derived from business object models. My general problem is to index data =
which may be the result of an expensive computation involving a graph of =
objects (for example computing which customer has which items in their =
shopping cart or computing access privileges for objects).
I would like to index this so that (for example) displaying a customers =
shopping cart is fast and so we can also see who is currently shopping =
for some certain items, etc. Of course, data would be more complex than =
this.
Basically, it is the kind of thing you would do with a "view" in SQL =
DBs.

The main problem is updating this indexed view in a timely fashion when =
the business data changes. Ideally, updates should be instant, but of =
course that will not happen as potentially intensive computation is =
required and business objects are a bit more intelligent (and thus =
harder to deal with) than SQL table rows.

I've found some research papers on the topic, but I was wondering if =
anyone does this right now and if they could explain their approach. I =
would be especially curious about update optimizations and the question =
if this can be done in a generic way or if this has to be built in to =
the business objects (e.g. to notice that the derived data has to be =
updated).

Thanks in advance and best regards,

Max Pfingsthorn

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