BaseX-Talk

basex-talk@mailman.uni-konstanz.de

6 participants
5250 discussions

how to release the database lock?
by easy 16 Dec '13

16 Dec '13

Hi.,sir, I have done some delete op when there are some update write op in basex. now, the db report error, can't open the db, say still another process has open the db. but I have down the db. so , how to restore the db? the data lost? Is there some way to restore the db in basex? Eagerly. Thanks -- 此致 easy 莫愁前路无知己，天下谁人不识君。

1 0

Getting started
by Ihe Onwuka 14 Dec '13

14 Dec '13

Finally took a look - very impressive. I got some warnings on the command line, one about tagsoup which I have fixed, another that bamboozled me because I have a java runtime installed......any here is what I get..... I've looked for a search for the mailing list but it seems to be well concealed - so what should I do. [warning] /usr/bin/basex: No java runtime was found [warning] /usr/bin/basex: Unable to locate /usr/share/java/tagsoup.jar in /usr/share/java [warning] /usr/bin/basex: No JAVA_CMD set for run_java, falling back to JAVA_CMD = java

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Upcoming: XMLPrague 2014!
by Christian Grün 14 Dec '13

14 Dec '13

Dear all, The XMLPrague Conference is the most important event for XML experts, developers and users in Europe. Next year, it will take place from Feb 14-16 (Fri-Sun): http://www.xmlprague.cz/ Don’t miss the event (which is, by the way, very affordable)! Just like last year, we will be offering a BaseX User Meeting on Friday. We are currently compiling the agenda. As many of you are using BaseX in exciting projects, it would be great to have some of you talk about your experiences. Would you be interested? Just ask for more details. We are looking forward to seeing many of you in Prague, Christian

1 0

strange behaviour of the BaseXgui-editor
by Rob Stapper 14 Dec '13

14 Dec '13

Hi, I encountered a few (3) problems with the BasexGui-editor. I use the 7.8 beta release but the issue's also occur in previous versions. Problem 1: this is a minor problem but maybe related to problem 2 which is ( for me) a major problem: If I open two ( small) packages of which one has no errors and one has errors then the errorstatus-message at the bottom of the editor doesn't synchronize correctly when switching files. If I switch from the incorrect packagefile to the correct packagefile the errormessage doesn't refresh to 'ok' until I edit this file. Even after closing an activated incorrect packagefile the errormessage stays active. Clicking on the message even reopens the incorrect packagefile. Switching the focus from the correct packagefile to the incorrect packagefile however, doesn't show this behavior. In that case the errorstatus-message changes to the appropriate errormessage of the incorrect file. Problem 2: which is a major problem when working with big files ( 80 kB) I found that when editing a large(r) packagefile the Basexgui-editor doesn't recognize errors that occur after a certain point in the file. If errors occur after this point the errorstatus-message shows 'ok' but I know that the file contains errors and if I try to install the file as a package I get an window with the message below. If the error occurs before that certain point then I get an correct errormessage. However if I delete the code which contains the error the error-message remains. Clicking on the message brings the cursor to the point where the deleted code with the error used to be, even after saving and closing the file. Errormessage ============================================================================ ============================================== Improper use? Potential bug? Your feedback is welcome: Contact: basex-talk(a)mailman.uni-konstanz.de Version: BaseX 7.8 beta Java: Oracle Corporation, 1.7.0_45 OS: Windows Vista, x86 Stack Trace: java.lang.NullPointerException at org.basex.query.func.StaticFuncs.check(StaticFuncs.java:121) at org.basex.query.QueryParser.finish(QueryParser.java:312) at org.basex.query.QueryParser.parseLibrary(QueryParser.java:253) at org.basex.query.QueryContext.parseLibrary(QueryContext.java:197) at org.basex.query.util.pkg.RepoManager.installXQ(RepoManager.java:230) at org.basex.query.util.pkg.RepoManager.install(RepoManager.java:70) at org.basex.core.cmd.RepoInstall.run(RepoInstall.java:37) at org.basex.core.Command.run(Command.java:344) at org.basex.core.Command.exec(Command.java:320) at org.basex.core.Command.execute(Command.java:77) at org.basex.core.Command.execute(Command.java:89) at org.basex.gui.dialog.DialogProgress$1.run(DialogProgress.java:178) ============================================================================ ============================================== Being a responsible Basex-user I does what it says and give you some feedback J Problem 3: This is an old issue that I addressed e few months ago but which you could not reproduce. I found a new clue which might help you solving this issue. The issue was when working in fullscreen mode (F11) in the BasexGUI and then saving a file with 'save as .' The save-messagebox gets the focus but disappears behind fullscreen basexgui-window. This has something to do with using a dual monitorsystem. On a single monitor system it works ok: The save-box is placed on top of the fullscreen Basexgui-window and gets the focus. On a dualmonitorsystem the save-box is placed behind the fullscreen Basexgui-window and gets the focus. I hope this insight helps you tackle this minor issue. Well, that's all folk. I hope you can solve the editor-problem soon because I have a really hard time debugging my (large(r)) programs. Regards, Rob Stapper

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Xquery for multiple files
by Mansour Al Akeel 13 Dec '13

13 Dec '13

Hello all, I am not sure if this can be done in XQuery, and if BaseX makes it possible, but I am trying to query all the files under a directory. This directory is copied through webdav. For example, I need to get all the files that have root <article>. Searching for how to do this, I came across this post, that shows how to do something similar with marklogic http://stackoverflow.com/questions/19243253/search-and-load-all-xml-files-i… How to do this in BaseX if possible ?? Thank you.

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Is there a better way to do develop or test with c/s mode server?
by easy 13 Dec '13

13 Dec '13

Hi, all I found the Gui can only work with local mode, but I want do some xquery test / sandbox with basex server, only found can do in client mode, Is there some other way ?esp for restful web mode. thanks -- 此致 easy 莫愁前路无知己，天下谁人不识君。

3 2

fn:doc("c:/...")
by Hans-Juergen Rennau 13 Dec '13

13 Dec '13

Dear BaseX team, I'm a little confused by the behavior of the fn:doc function: doc('/c:/projects/foo.xml') yields this error msg: [FODC0002] Line 1: No text allowed before root element. Whereas these work: doc('c:/projects/foo.xml') doc('file://c:/projects/foo.xml') Is this a bug or a feature? At any rate the error msg is confusing. I've used the latest snapshot (20131211.173706). Kind regards, Hans-Juergen

2 1

basex retrieve command
by Kamineni, Rajeshwar 13 Dec '13

13 Dec '13

Hi I have a document added using the ADD command. How do I just view it without an XQUERY. I thought RETRIEVE command should work but doesn’t help. Are there any other ways?? Thanks Raj Kamineni [T] +1 571 434 5463 [M] +1 703 342 9358

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Re: [basex-talk] Local variables holding retrieved data from BaseX
by Christian Grün 12 Dec '13

12 Dec '13

Hi Teena (cc @basex-talk), first of all, thanks for giving us details on your data and queries. To complete this: do you have a complete version of your query that shows us what are the values of $context, $project and $scopeName? As an example, I’m wondering what are the ancestor nodes of the <scopes> elements. > declare function foo:get-node-v1($context as element()?, $project as > element()?, $scopeName as xs:string) as element()? { > if (exists($project) = true()) then ( > $project/scopes/scope[@name=$scopeName]/item > ) > else () > }; The following query is equivalent, by the way (this is the beauty of XPath): declare function foo:get-node-v1($context as element()?, $project as element()?, $scopeName as xs:string) as element()? { { $project/scopes/scope[@name=$scopeName]/item }; If all your data is stored in the same database, it may be faster to open the database within the function. One more optimization could be to directly access the text index: declare function foo:get-node-v1($context as element()?, $project as element()?, $scopeName as xs:string) as element()? { { db:attribute("name-of-your-db", $scopeName, "name")/parent::scope }; You could also check out the latest stable snapshot of BaseX 7.8 [1], which inlines functions and may thus do this automatically. > When we call the first function in another > function and use it for further computation, it is always slower by 40 > seconds (when compared to second variation of the function). > What could be causing this? Difficult to say; we probably need to see your complete function call. > Are we still referencing to baseX document when > we do following instead of getting a local copy? > let $items := foo:get-node-v1($context, $project, $scopeName) Yes, the returned nodes still reference nodes in the database. Hope this helps, Christian [1] http://files.basex.org/releases/latest/

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Throughput Issues
by Jeremy Moseley 12 Dec '13

12 Dec '13

Hi Guys, I am attempting to diagnose some throughput issues we are having with BaseX, and I was hoping to get some input on a couple of thread blocking issues I am noticing. Please see the Gist ( https://gist.github.com/jerezzprime/7901172) containing the thread dumps for reference. These thread dumps were generated while BaseX was handling a large number of requests produced using Apache Benchmark. All requests were being made against the same URL and the thread dumps were gathered over a 30 second period. The most common place for threads to be blocking is at org.basex.io.random.TableDiskAccess.read*. The threads are waiting for other threads to finish, since these method calls are synchronized. Is it possible to concurrently read from disk? Another place threads appear to be blocking is while waiting for the lock to call org.basex.http.RestXqModules.cache (another synchronized method). It seems like this should only be called once to parse the modules, and then all requests afterwards should be retrieved from the cache, but from the thread dumps it appears threads are still re-parsing the xquery modules. Is this expected behavior? Thanks, Jeremy

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