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    <p>I have used lucene.net also as storage engine, because it's easier to distribute and setup alternate machines with an index than a database, it's just a filesystem copy, you can index on one machine, and just copy the new files to the other machines to distribute the index. All the searches and details are shown from the lucene index, and the database is just used for editing. This setup has been proven as a very scalable solution for our needs. </p> <p>Regarding the differences between sql server and lucene, the principal problem with sql server 2005 full text search is that the service is decoupled from the relational engine, so joins, orders, aggregates and filter between the full text results and the relational columns are very expensive in performance terms, Microsoft claims that this issues have been addressed in sql server 2008, integrating the full text search inside the relational engine, but I don't have tested it. They also made the whole full text search much more transparent, in previous versions the stemmers, stopwords, and several other parts of the indexing where like a black box and difficult to understand, and in the new version are easier to see how they works. </p> <p>With my experience, if sql server meet your requirements, it will be the easiest way, if you expect a lot of growth, complex queries or need a big control of the full text search, you might consider working with lucene from the start because it will be easier to scale and personalise.</p>
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