Date: 2004-12-30T13:08:32 Editor: DanielNaber Wiki: Jakarta Lucene Wiki Page: LuceneFAQ URL: http://wiki.apache.org/jakarta-lucene/LuceneFAQ
no comment Change Log: ------------------------------------------------------------------------------ @@ -1,4 +1,4 @@ -This FAQ is currently being worked on (2004-12-22), the update should be done in a few days. +This FAQ is currently being worked on (2004-12-30), the update should be done in a few days. Note that the [http://lucene.sourceforge.net/cgi-bin/faq/faqmanager.cgi old FAQ] isn't maintained anymore. @@ -58,6 +58,24 @@ === Searching === + +==== Why am i getting no hits / incorrect hits? ==== + +Some possible causes: + + * The desired term is in a field that was not defined as 'indexed'. Re-index the document and make the field indexed. + * The term is in a field that was not tokenized during indexing and therefore, the entire content of the field was considered as a single term. Re-index the documents and make sure the field is tokenized. + * The field specified in the query simply does not exist. You won't get an error message in this case, you'll just get no matches. + * The field specified in the query has wrong case. Field names are case sensitive. + * The term you are searching is a stop word that was dropped by the analyzer you use. For example, if your analyzer uses the StopFilter, a search for the word 'the' will always fail (i.e. produce no hits). + * You are using different analyzers (or the same analyzer but with different stop words) for indexing and searching and as a result, the same term is transformed differently during indexing and searching. + * The analyzer you are using is case sensitive (e.g. it does not use the LowerCaseFilter) and the term in the query has different case than the term in the document. + * The documents you are indexing are very large. Lucene by default only indexes the first 10,000 terms of a document to avoid OutOfMemory errors. See [http://jakarta.apache.org/lucene/docs/api/org/apache/lucene/index/IndexWriter.html#maxFieldLength IndexWriter.maxFieldLength]. + +If none of the possible causes above apply to your case, this will help you to debug the problem: + + * Use the Query's toString() method to see how it actually got parsed. + * Use [http://www.getopt.org/luke/ Luke] to browse your index. ==== What wildcard search support is available from Lucene? ==== --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
