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From Apache Wiki <>
Subject [Solr Wiki] Update of "FilterQueryGuidance" by FergusMcMenemie
Date Fri, 12 Jun 2009 21:20:24 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The following page has been changed by FergusMcMenemie:

The comment on the change is:
adding more detail to explaination of fq

  You should be familiar with the different caches Solr has
  in order to make informed decisions on filter usage.
- You will then know that a filter query
- results in a filter (implemented as a bit vector),
- which is cached,
- which means that it is the more useful the more often it is repeated.
+ You will then know that the first occurrence of a filter query results in a filter 
+ (implemented as a bit vector), being cached within Solr.
+ A separate filter cache entry is made for each `fq` argument
+ in your query. Each `fq` involves a complete search of the index.
  Now, what is a filter query?
  It is simply a part of a query that is factored out for special treatment.

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