The document is indexed first. This is required by the application. Based on Lucene in Action", "Optimizaation" is to merge multiple index files together in order to reduce their number and thus minimize the time it takes to read at search time" The approach1 does deletion on an optimized index. So, the number of index files are the same as before the deletion.
-----Original Message----- From: Mordo, Aviran (EXP N-NANNATEK) [mailto:[EMAIL PROTECTED] Sent: Thursday, December 08, 2005 1:16 PM To: java-user@lucene.apache.org Subject: RE: delete and optimize Well the best way in my opinion is to: 1) open the IndexReader and delete some documents from the same index 2) close the IndexReader 3) open IndexWriter and index documents 4) optimize the indexWriter and close the indexWriter For best performance you want the optimization to be that last operation HTH Aviran http://www.aviransplace.com -----Original Message----- From: Dan Liu [mailto:[EMAIL PROTECTED] Sent: Thursday, December 08, 2005 11:24 AM To: java-user@lucene.apache.org Subject: delete and optimize Hi, What is the difference between following approaches? Approach1 1) open IndexWriter and index documents 2) optimize the indexWriter and close the indexWriter 3) open the IndexReader and delete some documents from the same index 4) close the IndexReader Approach2 1) open IndexWriter and index documents 2) close the IndexWriter 3) open the IndexReader and delete some documents from the same index 4) close the IndexReader 5) open the IndexWriter again 6) optimize the indexWriter and close the indexWriter The Approach1 is definitely faster than Approach2. The difference is that the Approach1 does not renumber the document nubmer. While with the Approach2, the document nubmer reflects the renumbered doucements. In other words, that reader.maxDoc() gives different result between Approach1 and 2. Since the optimize only affects the search speed, will I have any performance diffenece between these approaches while searching? (note: the documents are actually deleted when IndexReader is closed) Thanks /dan --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
