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From "Kiran Joisher" <>
Subject RE: Updating index if there is a database changes
Date Thu, 04 May 2006 06:30:34 GMT
Thanks Stephen,

This was really helpful. 


-----Original Message-----
From: Stephen Gray [] 
Sent: Thursday, May 04, 2006 4:11 AM
Subject: Re: Updating index if there is a database changes

Hi Kirin,

Once you've updated an index using IndexWriter or IndexReader you just need
to close and re-open your IndexSearcher so that searching includes the
changes. There is a great library callled LuceIndexAccessor at the link
below that manages this for you. It creates an IndexReader/Writer/Searcher
and hands out references to classes that need to use them. When you want to
read/write you just get a reference to the appropriate object from the
index accessor, then release it when you've finished. If you make changes
using an IndexWriter then release the reference, it waits until all
IndexSearcher refs have been released, then recreates the searcher

The link is:

You might also like to look at DelayCloseIndexSearcher at


At 05:31 PM 3/05/2006, you wrote:
>Hi all,
>I m working on a project where I will use lucene to make a search engine on
>a database. I am new to lucene. I wrote a test program which indexes a
>and searches the same.. but now I m stuck on how to update the index in
>a database change occurs.. I need some help on this how do I
>update the index at run time... can it be done then and there...or do I
>to write some kind of schedular program which "re-builds" the entire index
>say once in a day ... which will be more efficient ?
>the data will be huge... 4 million records something..
>Thanks in advance,
>To unsubscribe, e-mail:
>For additional commands, e-mail:

Stephen Gray
Archive Research Officer
Australian Social Science Data Archive
18 Balmain Crescent (Building #66)
The Australian National University
Canberra ACT 0200

Phone +61 2 6125 2185
Fax +61 2 6125 0627

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