Re: Search performance with one index vs. many indexes
Jochen Franke writes: Topic: Search performance with large numbers of indexes vs. one large index My questions are: - Is the size of the wordlist the problem? - Would we be a lot faster, when we have a smaller number of files per index? sure. Look: Index lookup of a word is O(ln(n)) where n is the number of words. Index lookup of a word in k indexes having m words is O( k ln(m) ) In the best case all word lists are distict (purely theoretical), that is n = k*m or m = n/k For n = 15 Mio, k = 800 ln(n) = 16.5 k*ln(n/k) = 7871 In a realistic case, m is much bigger since word lists won't be distinct. But it's the linear factor k that bites you. In the worst case (all words in all indices) you have k*ln(n) = 13218.8 HTH Morus - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: help with boolean expression
Omar Didi writes: I have a problem understanding how would lucene iterpret this boolean expression : A AND B OR C . it neither return the same count as when I enter (A AND B) OR C nor A AND (B OR C). if anyone knows how it is interpreted i would be thankful. thanks A AND B OR C creates a query that requires A and B. C influcenes the score, but is neither sufficient nor required for a match. IMO query parser is broken for queries mixing AND and OR without explicit braces. My favorite sample is `a AND b OR c AND d' which equals `a AND b AND c AND d' in query parser. I suggested a patch some time ago, but it's still pending in bugzilla. http://issues.apache.org/bugzilla/show_bug.cgi?id=25820 Don't know if it's still usable with current sources. Morus - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Sorting date stored in milliseconds time
Ben writes: I store my date in milliseconds, how can I do a sort on it? SortField has INT, FLOAT and STRING. Do I need to create a new sort class, to sort the long value? Why do you need that precicion? Remember: there's a price to pay. The memory required for sorting and the time to set up the sort cache depends on the number of different terms, dates in your case. I can hardly think of an application where seconds are relevant, what do you need milliseconds for? Morus - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
