On Mar 17, 2005, at 11:13 AM, Michael Celona wrote:
Epoch is in seconds...
But you still haven't provided the *type* of epoch. It's a Date? a String? What do the string values look like?
I am also forced to used a date filter on most of searches... how bad is the performance hit of that.
Only testing will tell. The hit of a filter comes the first time (as long as you cache and use the same IndexReader), so its not likely to be a factor over many queries.
Erik
-----Original Message----- From: Erik Hatcher [mailto:[EMAIL PROTECTED] Sent: Thursday, March 17, 2005 9:54 AM To: java-user@lucene.apache.org Subject: Re: search performace
Is epoch a Date? or a String? If a String, what format is it?
Sorting by a Date keyword field will be sorting as a String value, which is a fair bit more resource intensive than if it was numeric.
Try using a purely numeric field (though as a String) that can be represented as an int be sure to specify the sort type as an int and see if that improves performance. I'm pretty certain you'd still get better performance by using a boost than a sort though.
Erik
On Mar 17, 2005, at 8:59 AM, Michael Celona wrote:
I am sorting against an epoch time stored in my index. By using:
contactDocument.add( Field.Keyword( "epoch_time", epoch );
Then I sort by this field. My search time is in the order of 3sec on
an
index of about 6G using simple searches against a text field. By using
boosts I was hoping to increase performance. Do you think this will
make a
big difference?
Michael
-----Original Message----- From: Erik Hatcher [mailto:[EMAIL PROTECTED] Sent: Tuesday, March 15, 2005 8:43 AM To: java-user@lucene.apache.org Subject: Re: search performace
I've been effectively off-line for a few days, so I'm not sure if anyone has replied on this thread yet.
Using boosts will definitely use less resources than sorting. If you do use sorting for dates, be sure you're doing it numerically rather than lexicographically.
Erik
On Mar 10, 2005, at 8:45 AM, Michael Celona wrote:
I have a large index that needs to yield very fast query times. I am sorting by date as default since I am interested in the most recent documents. I was wondering if I boosted the score of my documents in proportion to the date and not sorting would this increase search performance. Thoughts?
Thanks,
Michael
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