BaseX-Talk February 2013

basex-talk@mailman.uni-konstanz.de

49 participants
78 discussions

problem keeping basexserver as an alive service
by Richard Alexander Castro Mamani 18 Feb '13

18 Feb '13

Hello, I am having problems keeping the basexserver service alive, you see every time I active the service it works for a couple of hours and then it just stops and I the application cannot connect to the database. It is very inconvenient to keep on typing the following command every time to active the service. richard@0113:~$ basexserver BaseX 7.0.2 [Server] Server was started. Could you tell me what I am doing wrong?. I installed it without any inconvenient but now I don't know how to solve this issue. Thanks in advance for any answer. Greetings Richard -- Br. Richard Castro http://unsaac.academia.edu/RichardAlexanderCastroMamani Grupo de Investigación Hinantin UNSAAC skype: richardtk_1 rcastro(a)hinantin.com http://hinantin.unsaac.edu.pe

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WebDAV Locking of BaseX Source on Tomcat
by Sean Healy 17 Feb '13

17 Feb '13

BaseX 7.6 Tomcat 7 Oxygen Editor 14 Ubuntu 12.10 We would like writers to edit BaseX source via WebDAV and require level 2 WebDAV conformance (locking). We have uncommented: ... <servlet> <servlet-name>WebDAV</servlet-name> <servlet-class>org.basex.http.webdav.WebDAVServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>WebDAV</servlet-name> <url-pattern>/webdav/*</url-pattern> </servlet-mapping> … within .../tomcat7/webapps/bxApp/WEB-INF/web.xml. The class org.basex.http.webdav.WebDAVServlet does not seem to implement low-level, server-side methods such as LOCK. To verify that locking is possible with our toolset, we followed this generic Tomcat/WebDAV tutorial (http://www.mulesoft.com/tomcat-webdav). Tutorial's web.xml: <?xml version="1.0" encoding="UTF-8"?> <web-app ... <display-name>Tomcat webDAV TEST 1</display-name> <description>webDAV HTTP Services</description> <servlet> <servlet-name>webdav</servlet-name> <servlet-class>org.apache.catalina.servlets.WebdavServlet</servlet-class> <init-param> <param-name>debug</param-name> <param-value>0</param-value> </init-param> <init-param> <param-name>listings</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>readonly</param-name> <param-value>false</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>webdav</servlet-name> <url-pattern>/webdav/*</url-pattern> </servlet-mapping> <security-constraint> <web-resource-collection> <web-resource-name>myApp</web-resource-name> <url-pattern>/*</url-pattern> <http-method>PROPFIND</http-method> <http-method>PROPPATCH</http-method> <http-method>COPY</http-method> <http-method>MOVE</http-method> <http-method>LOCK</http-method> <http-method>UNLOCK</http-method> </web-resource-collection> </security-constraint> <security-role> <description>WebDAV User</description> <role-name>webdav</role-name> </security-role> </web-app> The tutorial demonstrated for us that locking is possible. What is the relationship/interaction between org.apache.catalina.servlets.WebdavServlet, with its full compliment of methods, and org.basex.http.webdav.WebDAVServlet? Or more to the point, how should web.xml within our BaseX servlet be configured within for webDAV on Tomcat? Does org.basex.http.webdav.WebDAVServlet even enter into the equation for our use (e.g., locking). An example web.xml would be much appreciated. Also, is authentication for WebDAV using credentials from .../tomcat/config/tomcat-users.xml (as in the tutorial), from .basexperm, or from some other source? Thank you in advance for your help. Sean

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Call for papers, XML London 2013
by Charles Foster 16 Feb '13

16 Feb '13

Calling all BaseX and XML aficionados. The XML London 2013 conference takes place on 15/16th June 2013 at University College London. We are looking for speakers for this event. Speakers go for free. Call for papers is open and closes 15th March. Submissions do not HAVE to be final papers by that date, extended abstracts which succinctly describe the contents of a final paper will suffice. If successful, final / polished papers will need to be completed by 15th May. The conference has themed topics. However, papers of outstanding quality or novelty are ALWAYS welcome at XML London, regardless of whether they fit into any of the conference theme topics. The conference theme topics are as follows: Applied XML Real life use cases of where XML technologies have been beneficial. Document Databases The future of search across structured and unstructured data. Financial Markup The role of XML in finance and trading. Semantic Web XML working with Linked Data, Ontologies, Topologies, Graphs. Teaching XML XML tech is cool, why so? what can it do for people who are not using it? XML Elephant Coping with and processing huge volumes of XML and Big Data effectively. XML Librarian Publishing content to books, the web and a world of gadgets. For more information, please visit the XML London website: http://xmllondon.com Regards, Charles XML London

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Lassen Sie uns Suche nach der Wahrheit für ein besseres Leben.
by Administrator 15 Feb '13

15 Feb '13

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path index does not seem to be used
by Fabrice Etanchaud 14 Feb '13

14 Feb '13

Dear all at BaseX, In a indexed database, Query info shows that a request like Count(/a/b/c) does not use the statistics data available with index:facets(). Could you please tell me if this is really the case, and if there is a way to tell BaseX to use it ? Best regards, And thank you for your great XNDB ! Fabrice Here is the query : Query: declare namespace exch = 'http://www.epo.org/exchange'; count(/exch:exchange-documents/exch:exchange-document) Query plan: <QueryPlan> <FNAggr name="count(item)"> <IterPath> <DBNodeSeq size="38"> <DBNode name="DOCDB_RU" pre="0"/> <DBNode name="DOCDB_RU" pre="4198620"/> <DBNode name="DOCDB_RU" pre="7369614"/> <DBNode name="DOCDB_RU" pre="11083006"/> <DBNode name="DOCDB_RU" pre="15423603"/> </DBNodeSeq> <IterStep axis="child" test="exch:exchange-documents"/> <IterStep axis="child" test="exch:exchange-document"/> </IterPath> </FNAggr> </QueryPlan> Here is the db:info() : <database> <databaseproperties> <name>DOCDB_RU</name> <size>3391 MB</size> <nodes>135589551</nodes> <documents>38</documents> <binaries>0</binaries> <timestamp>2013-01-29-23-16-31</timestamp> </databaseproperties> <resourceproperties> <inputpath>C:/data/work/docdb/RU</inputpath> <timestamp>2012-12-28-06-53-45</timestamp> <encoding>UTF-8</encoding> <whitespacechopping>ON</whitespacechopping> </resourceproperties> <indexes> <uptodate>true</uptodate> <textindex>ON</textindex> <attributeindex>ON</attributeindex> <fulltextindex>OFF</fulltextindex> <updindex>ON</updindex> <maxcats>10000</maxcats> <maxlen>96</maxlen> </indexes> </database>

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XMLPrague: Talks and Slides
by Christian Grün 13 Feb '13

13 Feb '13

Dear subscribers, it was great to see and talk to many of you at the XMLPrague conference! The slides of most talks are now available online: http://files.basex.org/xmlprague2013/ Video clips of the presentations are in process and will be added soon. Have fun, Christian

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access to dom representation of result in server mode or with xqj
by Fabrice Etanchaud 13 Feb '13

13 Feb '13

Dear all at BaseX, Is there a way to gain access the dom representation of a query result in server mode, or with xqj ? (in simple words, could a client side parser work directly on the internal server representation, for example by returning a 'eventified' serialization of the result ?) Thank you for your wonderful NXDB ! Best regards, Fabrice

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file:list - returns no directories
by Hans-Juergen Rennau 13 Feb '13

13 Feb '13

Dear BaseX team, the documentation states: "Lists all files and directories found in the specified $dir."; however the function does not always return file names. (1) If parameter $recursive=true, the contents are returned, but not the directories themselves. (2) The call "file:list($dir, false(), '*') does not return directories In case of (1), this behavior may often be desirable, but sometimes not, namely if I want to construct a directory tree. Perhaps a further control option would be worth considering? I am not sure. At any rate, if the present behavior is intended, the documentation should be adapted. (2) seems to me a bug, as the call should be equivalent to a one-parameter call, shouldn't it? With kind regards, Hans-Juergen

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loading basex from a cron job
by rsr 13 Feb '13

13 Feb '13

I am just getting started with basex and have been attempting to load data into a basex db via a cron job. I am running the basexclient inside my job redirecting a bxs command file to the client. this works well when i run my script off the command line by fails when run via cron. i've checked the obvious stuff (relative paths, permissions etc). Does anyone have experience loading basex via cron that could point me in the right direction. thanks /home/xxx/basex/bin/basexclient -Uxxx -Pxxx < /home/xxx/load.bxs

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Re: [basex-talk] handling large files: is there a streamingsolution?
by pw＠themail.co.uk 12 Feb '13

12 Feb '13

Hi Fabrice and list I am dealing with data-centric XML rather than documents and so there is a fairly high node to content ratio. I have about 250 million nodes and I find that having about 15 million nodes per database seems to work well, but this is just a guesstimate and I am really looking for some performance profiles or some heuristics so that I can limit the numbers of nodes in each database before the performance degrades. Cheers Peter > > >---- Original Message ---- >From: fetanchaud(a)questel.com >To: pw(a)themail.co.uk, fetanchaud(a)questel.com, >BaseX-Talk(a)mailman.uni-konstanz.de >Subject: RE: [basex-talk] handling large files: is there a >streamingsolution? >Date: Tue, 12 Feb 2013 09:07:40 +0000 > >>Dear Peter, >> >>I'm just a BaseX user, and Christian's team will correct me, but >from my experience, document size does not matter, at least for >querying. >> >>Why do you talk about distributing data ? Did you reach the 2 >billion nodes limit ? >> >>As BaseX indexes all nodes, depending on the values distribution, >creating a new collection containing hand made indices can speed up >your queries. >> >>For example, for append only collections, I'm used to creating a >index collection like this : >><index> >> <item value='value to be indexed'> >> the 'pre' pointer to the indexed element >> </tem> >> <item>... >></index> >> >>And access that 'index' something like this : >> >>for $i in >> //item[@value='searched value'] >>return >> db:open-pre('mydb', $i) >> >> >>And a big number of documents may slow down the properties window >display in the GUI, because of the document tree view. >> >> >>Question to the BaseX 's team : would 'user defined' indices be a >interesting feature ? >> >> >>Regards >> >>-----Message d'origine----- >>De : pw(a)themail.co.uk [mailto:pw@themail.co.uk] >>Envoyé : lundi 11 février 2013 17:13 >>À : Fabrice Etanchaud; pw(a)themail.co.uk; >BaseX-Talk(a)mailman.uni-konstanz.de >>Objet : RE: [basex-talk] handling large files: is there a >streamingsolution? >> >>Thanks Fabrice, I am making good progress following your advice. Do >you have any heuristics for the best way to distribute data for >performant searches and subsetting of data? Am I better having lots >of small files or a few large files in a collection? >> >>> >>> >>> >>>---- Original Message ---- >>>From: fetanchaud(a)questel.com >>>To: pw(a)themail.co.uk, BaseX-Talk(a)mailman.uni-konstanz.de >>>Subject: RE: [basex-talk] handling large files: is there a >>>streamingsolution? >>>Date: Mon, 11 Feb 2013 14:38:54 +0000 >>> >>>>Dear Peter, >>>> >>>>Did you try to create a collection with the files (CREATE command) >? >>>>You should start that way, I don't see the point in using file: >>>module for import. >>>>I think that once in the database, file size does not matter >(until >>>you reach millions of file in the collection, and do a lot of >document >>>related operations (list, etc...)) >>>> >>>> >>>> >>>>-----Message d'origine----- >>>>De : basex-talk-bounces(a)mailman.uni-konstanz.de >>>[mailto:basex-talk-bounces@mailman.uni-konstanz.de] De la part de >>>pw(a)themail.co.uk >>>>Envoyé : lundi 11 février 2013 15:33 >>>>À : BaseX-Talk(a)mailman.uni-konstanz.de >>>>Objet : [basex-talk] handling large files: is there a streaming >>>solution? >>>> >>>>Hello List >>>>I am wanting to do a join with some large (3-400Mb) XML files and >>>would appreciate guidance on the optimal strategy. >>>>At present these files are on the filesystem and not in a database >>>> >>>>Is there any equivalent to the Zorba streaming xml:parse()? >>>> >>>>Would loading the files into a database directly be the approach, >or >>>is it better to split them into smaller files? >>>> >>>>Is the file: module a suitable route through which to import the >>>files? >>>> >>>>Thanks for your help >>>> >>>>Peter >>>> >>>>_______________________________________________ >>>>BaseX-Talk mailing list >>>>BaseX-Talk(a)mailman.uni-konstanz.de >>>>https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>>> >> >> >>

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BaseX-Talk February 2013