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The following page has been changed by paulsundling: http://wiki.apache.org/solr/SolrPerformanceFactors ------------------------------------------------------------------------------ * An un-optimized index is going to be ''at least'' 10% slower for un-cached queries. * Auto-warming time will grow since it's normally dependent on doing searches. * The first distribution after an optimization will take longer than subsequent ones. See [:CollectionDistribution:Collection Distribution] for more information. + * During optimization the file size of the index doubles, but returns to it's original size or even slightly less. Since optimizing an index saves all the segments in an index (about 7 files per segment) into a single segment, optimizing an index helps avoid the "too many open files" problem, i.e. running out of file descriptors, which is mentioned in an [http://www.onjava.com/pub/a/onjava/2003/03/05/lucene.html#indexing_speed ONJava Article].
