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From Alexander Rosemann <>
Subject multiple small indexes or one big index?
Date Wed, 01 Jun 2011 20:35:04 GMT
Hi all, I was wondering whether you could give me some advice on how to 
improve my search performance.

I have 90 lucene indexes, each having different fields (~5 per 
Document). When I search, I always have to go through all indexes to 
build my result set. Searching one index takes approx. 100ms, thus 
searching all indexes takes 9s in total.

How can I reduce the time it needs to search?

I decided to create this many indexes because putting all data in one 
index would mean that a document would have ~400 fields, with most of 
them left empty. Is that ok? Would a single index be faster compared to 
multiple small ones?

Any pointers are much appreciated.


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