what effect and what recommendations are valid for Lucene 1.3?
Same as always: use the defaults and call optimize() only when you know you won't be changing the index for a while.
If you have lots of RAM, increasing minMergeDocs may increase indexing speed, but raising it too high may cause out of memory problems.
You may also see some indexing speedup by increasing the mergeFactor, but raising it too high will cause file handle problems. Calling setUseCompoundFile() will enable higher mergeFactor settings before encountering file handle problems.
Obsession with indexing performance is not healthy. Before changing any settings convince yourself that indexing performance is a real problem for your application. How often do you re-index from scratch? Are you really having any difficulty keeping up with the rate of change of your collection? Perhaps your development time would be better spent focussing on other parts of your application.
Doug
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