BaseX-Talk October 2011

basex-talk@mailman.uni-konstanz.de

33 participants
49 discussions

stopping the basexhttp server
by Pascal Heus 22 Oct '11

22 Oct '11

Hi: Under linux, I use the basexhttp script in the bin folder to start the BaseX server and Jetty HTTP server (for REST and Webdav) To stop the process, I then copied the file into basexhttpstop nd added the stop keyword to the last line: java -cp "$CP" $VM org.basex.api.BaseXHTTP "$@" stop However, this only seems to affect the BaseX server (Jetty continues to run and listen on port 8984). I can of course kill the process but would prefer for this to be available from the command line. Could this be adjusted? thanks *P

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Ruby client causing java.net.SocketException on server
by Daniël Knippers 22 Oct '11

22 Oct '11

Good evening, I am using Ruby on Rails and BaseX for some hobby projects, and I have noticed the new Ruby client API + BaseX 7.0 causes java.net.SocketExceptions (see bottom of this message for complete error + stack trace) on the server. After inspecting the new client code, this seemed to have been caused by the new query iteration method which uses a cache. Reproducing this is easy; execute the QueryExample.rb script from the repository (make sure to first remove 'query.init', which is still in the example but has been removed from the API). It raises the Exception every single time for me. Note the query does seem to return the expected result so I could just ignore the Exception but that does not seem like the right thing to do :) On a side note, the 'if more()' in the 'next' method seems superfluous as query.next should only be called inside a 'while query.more' loop anyway. Effectively 'query.more' is now called twice in that loop before the cache is read. Kind regards, Daniël Knippers ps. I'm using Java 1.6.0_27, and the error occurs on the stable BaseX 7.0 as well as on snapshot 170343 (7.0.1 RC1). The error below is from the 7.0.1 RC1 version. Server and client were ran from the same machine. ================= <error> ================= java.net.SocketException: Connection reset by peer: socket write error java.net.SocketOutputStream.socketWrite0(Native Method) java.net.SocketOutputStream.socketWrite(Unknown Source) java.net.SocketOutputStream.write(Unknown Source) org.basex.io.out.BufferOutput.flush(BufferOutput.java:52) org.basex.io.out.PrintOutput.flush(PrintOutput.java:149) org.basex.server.ClientListener.send(ClientListener.java:504) org.basex.server.ClientListener.info(ClientListener.java:326) org.basex.server.ClientListener.run(ClientListener.java:212) ================= </error> ================= =============== <caused_by> =============== def more() if @cache.length == 0 @session.write(4.chr) @session.send(@id) while((a)session.read == 1.chr) @cache << @session.receive end end return @pos < @cache.length end def next if more() @pos += 1 return @cache[@pos - 1] end end =============== </caused_by> ===============

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Clustering/replicating?
by Pascal Heus 21 Oct '11

21 Oct '11

All: We're looking into possibly building large scale infrastructure around BaseX and wondering if there is any information available around database replication (read replicas) and running BaseX in clusters? Also, when I submit a query to a BaseX server, is there a way to limit the amount of time/resources the query can comsume? For example, can I say 'fail this query if it takes more than 30 seconds or 1Gb of memory'? many thanks *P

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ajax and http server - cross-domain, jsonp or proxy?
by colin mcenearney 21 Oct '11

21 Oct '11

Hi, I just installed basex for the first time and I am very impressed and really looking forward to using it. Thanks for making such a great tool available for free! I'm not really a developer so this might be an obvious question: using basex's http server, what is the best strategy for ajax-style communication between browser and db? I am aware of a few approaches: 1) direct httprequest to host:8984/my_db/somequery, but going across ports seems to violate "same origin policy" 2) using jsonp 3) calling from browser to server-script (like the php example in basex docs), which handles request to the db All responses are greatly appreciated, Colin

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Problems in using BaseX REST server - IncompatibleClassChangeError javax.ws.rs.core.Response$Status does not implement the requested interface
by Pushkaraj Thorat 21 Oct '11

21 Oct '11

Hello, I am doing setup for REST enabled basex database with procedure mentioned in http://docs.basex.org/wiki/JAX-RX_API URL. Configuring & starting server and running failed due to class not found, but later I've modified the ./basexrest script as: (Included all the jars in lib folder) ######START #!/bin/bash # Path to this script PWD=`dirname $0` # Paths to distributed files or source directories BASEX=$PWD/BaseX.jar BASEXAPI=$PWD/../lib/basex-api.jar # Classpath LIB=$PWD/../lib LIB_CP="" for JAR_FILE in $LIB/*.jar do LIB_CP="$LIB/$JAR_FILE:$LIB_CP" done CP=$BASEX:$BASEXAPI:$LIB_CP # Options for virtual machine VM=-Xmx1g # Run REST server java -cp "$CP" $VM org.basex.api.jaxrx.JaxRxServer "$@" ######END after this, server started successfully, hit the URL - http://localhost:8984/basex/jax-rx I am getting following exception: java.lang.IncompatibleClassChangeError: Class javax.ws.rs.core.Response$Status does not implement the requested interface javax.ws.rs.core.Response$StatusType at com.sun.jersey.spi.container.ContainerResponse.getStatus(ContainerResponse.java:548) at com.sun.jersey.spi.container.ContainerResponse$CommittingOutputStream.commitWrite(ContainerResponse.java:156) at com.sun.jersey.spi.container.ContainerResponse$CommittingOutputStream.write(ContainerResponse.java:133) at org.basex.io.BufferedOutput.flush(BufferedOutput.java:50) at org.basex.io.PrintOutput.flush(PrintOutput.java:126) at org.basex.data.XMLSerializer.cls(XMLSerializer.java:206) at org.basex.data.Serializer.close(Serializer.java:219) at org.basex.api.jaxrx.BXJaxRx$1.code(BXJaxRx.java:96) at org.basex.api.jaxrx.BXCode.run(BXCode.java:53) at org.basex.api.jaxrx.BXOutput.write(BXOutput.java:53) at com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:71) at com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:57) at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:299) Your help is appreciated. Thanks, Pushkaraj

3 6

Performance of Basex 7.0 XQuery execution
by Constantine Hondros 21 Oct '11

21 Oct '11

Hi there, I am running relatively simply XQuery over a Basex database read in from about 100 MB of XML. While performance in general is fantastic, with most queries completing in a few seconds, I am getting worryingly slow performace on certain queries using XPath axes such as preceding-sibling. For example, the following simple (if a bit silly) query takes over 30 minutes to execute: /tns:pois/tns:poi[not(preceding-sibling::tns:poi)] For what it's worth, there are only about 100,000 instances of the <tns:poi> element. So the immediate question is whether this performance is to be expected. If not, what are the obvious things to look at in terms of performance tuning? Thanks in advance, Constantine Constantine Hondros | Senior Data Engineer | TomTom Places | constantine.hondros(a)tomtom.com<mailto:constantine.hondros@tomtom.com> | +31 (0) 88 245 6239 office | +31 (0) 6 402 14838 mobile | places.tomtom.com<http://places.tomtom.com/>

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basexgui with client capability
by Fabrice Etanchaud 19 Oct '11

19 Oct '11

Dear all, do you plan to add client capability to BaseX GUI ? Fabrice ETANCHAUD Senior analyst programmer Edital

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Strange logical operation
by Erol Akarsu 19 Oct '11

19 Oct '11

Hi, I have faced some strange case as below. s1 and s variables has to have same value because their selecting operator same. Is there anything I miss? Why xquery is not calculating boolean for each sequence? let $ns := (4 , 5, 6, 7, 8, 3, 7) let $ind := (2,5,7) let $j := 1 let $i1 := $ind[$j] let $i2 := $ind[$j+1] let $s := $ns[fn:position() < $i2 and fn:position() > $i1] let $s1 := $ns[fn:position() > $i1 and fn:position() < $i2 ] return <result> <s>{$s}</s> <s1>{$s1}</s1> </result> <result> <s>6 7</s> <s1>6 7 8 3</s1> </result> Query: let $ns := (4 , 5, 6, 7, 8, 3, 7) Compiling: - pre-evaluating (4, 5, 6, 7, 8, 3, 7) - binding static variable $ns - pre-evaluating (2, 5, 7) - binding static variable $ind - binding static variable $j - pre-evaluating 1 + 1 - rewriting And expression to predicate(s) - rewriting fn:boolean(fn:position() < $i2) - rewriting fn:boolean(fn:position() > $i1) - rewriting And expression to predicate(s) - rewriting fn:boolean(fn:position() > $i1) - rewriting fn:boolean(fn:position() < $i2) - removing variable $ns - removing variable $ind - removing variable $j - moving for/let clauses Result: let $i2 := ((2, 5, 7))[position() = 2] let $i1 := ((2, 5, 7))[position() = 1] let $s1 := ((4, 5, 6, 7, 8, 3, 7))[fn:position() > $i1][fn:position() < $i2] let $s := ((4, 5, 6, 7, 8, 3, 7))[fn:position() < $i2][fn:position() > $i1] return element { "result" } { element { "s" } { $s }, element { "s1" } { $s1 } } Timing: - Parsing: 0.14 ms - Compiling: 0.56 ms - Evaluating: 0.46 ms - Printing: 0.05 ms - Total Time: 1.23 ms Result: - Results: 1 Item - Updated: 0 Items - Printed: 50 Bytes Query plan: <FLWR> <Let var="$i2"> <IterPosFilter> <ItrSeq size="3"> <Item value="2" type="integer"/> <Item value="5" type="integer"/> <Item value="7" type="integer"/> </ItrSeq> <Pos min="2" max="2"/> </IterPosFilter> </Let> <Let var="$i1"> <IterPosFilter> <ItrSeq size="3"> <Item value="2" type="integer"/> <Item value="5" type="integer"/> <Item value="7" type="integer"/> </ItrSeq> <Pos min="1" max="1"/> </IterPosFilter> </Let> <Let var="$s1"> <Filter> <ItrSeq size="7"> <Item value="4" type="integer"/> <Item value="5" type="integer"/> <Item value="6" type="integer"/> <Item value="7" type="integer"/> <Item value="8" type="integer"/> </ItrSeq> <CmpG op=">"> <FNAcc name="position()"/> <VarRef name="$i1"/> </CmpG> <CmpG op="<"> <FNAcc name="position()"/> <VarRef name="$i2"/> </CmpG> </Filter> </Let> <Let var="$s"> <Filter> <ItrSeq size="7"> <Item value="4" type="integer"/> <Item value="5" type="integer"/> <Item value="6" type="integer"/> <Item value="7" type="integer"/> <Item value="8" type="integer"/> </ItrSeq> <CmpG op="<"> <FNAcc name="position()"/> <VarRef name="$i2"/> </CmpG> <CmpG op=">"> <FNAcc name="position()"/> <VarRef name="$i1"/> </CmpG> </Filter> </Let> <Return> <CElem> <Item value="result" type="xs:QName"/> <CElem> <Item value="s" type="xs:QName"/> <VarRef name="$s"/> </CElem> <CElem> <Item value="s1" type="xs:QName"/> <VarRef name="$s1"/> </CElem> </CElem> </Return> </FLWR> On Wed, Oct 19, 2011 at 7:04 AM, Truong An Nguyen <ngtruongan(a)gmail.com>wrote: > Hi, > > can you please tell me how I apply the fulltext index for attributes? > > Many thanks. > > Cheers, > An > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk(a)mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk > >

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Full-Text index for attributes!
by Truong An Nguyen 19 Oct '11

19 Oct '11

Hi, can you please tell me how I apply the fulltext index for attributes? Many thanks. Cheers, An

2 1

BaseX 7.0 Update - Soft-Files.com
by Soft-Files Team 19 Oct '11

19 Oct '11

Dear Developer, Your product BaseX 7.0 has been updated. Your product review page is located at: http://www.soft-files.com/basex_72311.html. Sincerely, The Soft-Files Team

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BaseX-Talk October 2011