: I'd be interested to know what is the ideal size for an index to achieve 1 : sec response time for queries. I'd appreciate if you can share any numbers.
that's a fairly impossible question to answer ... the lucene email archives have lots of discusssion about how the number of documents isn't really the biggest facter when considering raw search performance ... the number of unique terms in the index and the average number of terms per docuemnt are typically more significant factors. there's also the question of what you mean by a "query" .. a simple term query is a lot cheaper/faster then a complex boolean query or a phrase query. -Hoss
