> I'd recommend a pool of filters for each category. 
> Regenerate them 
> when the index changes, otherwise leave the
> instances alive and reuse 
> them for queries - this will speed things up pretty
> dramatically I'd 
> guess.  There is a QueryFilter you could use, or
> write a custom one 
> that could be faster.
> 
>       Erik
> 
thanks for your quick response, Erik. BTW, I checked
your web site, the logo is cool. 

Is there a way to store the filter cache to hard
drive? Then I can just read it from hard drive. Since
I have lots of categories, it might be impossible to
cashe every query filter bitsets in memory.

How about I keep every category to one segment? Then I
have 10000 segements to work with. Is it going to be
faster than the filter solution?

------
Plus:
I am looking forward to your lucene book. I found one
in Amazon.com. Not sure if any good.

Professional Portal Development with Apache Tools :
Jetspeed, Lucene, James, Slide (Wrox Press)
by W. Clay Richardson (Author), Donald Avondolio
(Author), Joe Vitale (Author), Peter Len (Author),
Kevin T. Smith (Author) 

-- thank you 


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