Interesting article, although It is 4 years old and seems to reference observed behavior rather then defined behavior. The Query processor core is continually being improved so YMMV.
Your question asked about 'documents being loaded into memory' This may or may not be related to 'stream abilityΩIf your Xquery code and database indexing configurations can be resolved using indexes only then the document may not need to be loaded into memory at all. For queries that cross-cut across many documents, achieving high constant performance is achievable by structuring your queries such that they can be resolved completely from indexes. There is a key design concept for MarkLogic. The various users guide go into great detail regarding approaches to achieve this. Achieving 'streaming' is a different issue (and depend on what you mean by 'stream' exactly). For example it is possible to 'stream' large binary documents out of ML https://docs.marklogic.com/guide/app-dev/binaries In this sense, 'stream' is the sense of 'video streaming' ... Results exiting the server without having to have read to the end of the document. For Query operations that’s not the kind of 'streaming' the article refers to. Rather its revering to minimizing the need for the server to fully evaluate each expressions before 'handing' it to then next. In general all Xquery operations are potentially 'streamable' in this sense. For more consistent and defined behavior use of the ML specific functions are recommend, they are designed specifically for making optimal use of ML features, and are easier for the Xquery processor to optimize and recognize then 'pure' Xquery. On 3/8/16, 7:23 AM, "general-boun...@developer.marklogic.com on behalf of Christopher Hamlin" <general-boun...@developer.marklogic.com on behalf of cbham...@gmail.com> wrote: >I know of a little info about that here: > >http://blakeley.com/blogofile/2012/03/19/let-free-style-and-streaming/ > >On Tue, Mar 8, 2016 at 10:21 AM, Faktorovich, Yuriy ><yuriy.faktorov...@wolterskluwer.com> wrote: >> Is it possible to stream back the result using xquery without the document >> being loaded into memory on ML? >> >> >> >> Thank You, >> >> >> >> Yuriy >> >> >> >> >> _______________________________________________ >> General mailing list >> General@developer.marklogic.com >> Manage your subscription at: >> http://developer.marklogic.com/mailman/listinfo/general >> >_______________________________________________ >General mailing list >General@developer.marklogic.com >Manage your subscription at: >http://developer.marklogic.com/mailman/listinfo/general _______________________________________________ General mailing list General@developer.marklogic.com Manage your subscription at: http://developer.marklogic.com/mailman/listinfo/general
