> Quite a few Lucene examples on lines shows how to insert multiple fields
> into a Document and how to query the indexed file with certain fields and
> queried text. I would like to know:
>
> 1. How to do a cross-field search?
http://wiki.apache.org/lucene-java/LuceneFAQ#How_can_I_search_over_multiple_fields.3F
> 2. How to specify some key fields as well as some less important
> fields?
Boosting. See http://wiki.apache.org/lucene-java/LuceneFAQ#What_is_the_difference_between_field_.28or_document.29_boosting_and_query_boosting.3F
> 3. How many fields would cause performance issue?
Impossible to answer since there are too many variables but in general
the fewer fields used in a search the faster it will be. There are
many other factors, some of which are likely to outweigh this. See
http://wiki.apache.org/lucene-java/ImproveSearchingSpeed.
--
Ian.
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