Search query optimization

[Yongjun Rong]

Hi,
  I have a question about how the lucene query parser. For example, I
have query "A AND B AND C". Will lucene extract all documents satisfy
condition A in memory and then filter it with condition B and C? or only
the documents satisfying "A AND B AND C" will be put into memory? Is
there any articles discuss about how to build a optimization query to
save memory and improve performance?
  Thank you very much.
  Yongjun Rong