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From Otis Gospodnetic <>
Subject Re: Is it necessary to optimize?
Date Tue, 08 May 2007 15:15:07 GMT

----- Original Message ----
From: Stadler Hans-Christian <>

If mergeFactor is set to 2 and no optimize() is ever done on the index,
what is the impact on

1) the number opened files during indexing

OG: it will grow a little, but frequently go down as Lucene merges segments automatically
during indexing.  The pattern is increase slowly-reduce rapidly, increase slowly-reduce rapidly,

2) the number of opened files during searching

OG: the trend will follow the trend for the number of files from 1)

2) the search speed

OG: fast

3) the indexing speed

OG: slower than if you increased the mergeFactor, as with mergeFactor set to only 2, Lucene
will merge segments pretty frequently.

Lucene Consulting --

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