Abishek, You are correct, maps should be much faster measured as a percentage of the XPath approach. The absolute savings may only be a few milliseconds, though.
Damon From: [email protected] [mailto:[email protected]] On Behalf Of Abhishek53 S Sent: Tuesday, May 17, 2011 6:34 AM To: General MarkLogic Developer Discussion Subject: Re: [MarkLogic Dev General] Map API Advantage Thanks Damon, Danny and Jason ! My question is related to the NonQueryOptimization.pdf (MLUC11-talks page No 17) where it is explicitly mentioned that the pre-generated maps speed up the performance. My idea is to generate some map with the lookup data xml which can be set to server field and the while processing will retrieve the value from the Map present in the server field. Will map has any performance boost over lookup xml directly present in the expanded tree cache? Let me correct if I am wrong. Thanks & Regards Abhishek Srivastav Systems Engineer Tata Consultancy Services Cell:- +91-9883389968 Mailto: [email protected] Website: http://www.tcs.com<http://www.tcs.com/> ____________________________________________ Experience certainty. IT Services Business Solutions Outsourcing ____________________________________________ From: Damon Feldman <[email protected]> To: General MarkLogic Developer Discussion <[email protected]> Date: 05/16/2011 10:16 PM Subject: Re: [MarkLogic Dev General] Map API Advantage Sent by: [email protected] ________________________________ To expand on what Ryan and Danny just said: the "Expanded Tree" cache holds fully expanded XML that has been accessed recently. So if you are using this document often, it will already be availalbe to the E-Node in that cache. Yours, Damon ________________________________ From: [email protected] [[email protected]] On Behalf Of Danny Sokolsky [[email protected]] Sent: Monday, May 16, 2011 12:32 PM To: General MarkLogic Developer Discussion Subject: Re: [MarkLogic Dev General] Map API Advantage One other point here: is this performing slowly, or are you asking a theoretical question? My guess is this would perform OK without the map. Use the map technique if you need to squeeze a bit more out of it. I would not try to optimize it unless it needs it. If it does, try running the query using the cq profile button and see where it is spending time. -Danny From: [email protected] [mailto:[email protected]] On Behalf Of Jason Hunter Sent: Monday, May 16, 2011 8:37 AM To: General MarkLogic Developer Discussion Subject: Re: [MarkLogic Dev General] Map API Advantage You could store it as XML, then make a map out of it, and use xdmp:set-server-field() to save the map in memory between requests. Use xdmp:get-server-field() to retrieve it later. On server restart you'll have to regenerate the map. You'll also have to generate and save the map once on every E-node. Note that the map is associated with the entire host, not just the app server. -jh- On May 16, 2011, at 3:25 AM, Abhishek53 S wrote: Hi All I have my master lookup data XML inserted into Marklogic . <states> <state> <code>AL</code> <desc>Alaska</desc> </state> : : </states> I have two ways to get the description through code Construct the map with the codes and values and use the map API to get the description. Every time traverse the XML to get the description through code. Can any one suggest keeping performance in mind which one is better approach? Is there any other approach to do this (using any in-built indexing mechanism)? Abhishek Srivastav Systems Engineer Tata Consultancy Services Cell:- +91-9883389968 Mailto: [email protected]<mailto:[email protected]> Website: http://www.tcs.com<http://www.tcs.com/> ____________________________________________ Experience certainty. 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