BaseX-Talk April 2012

basex-talk@mailman.uni-konstanz.de

38 participants
48 discussions

Out of memory bug
by Ivan Lagunov 31 Jul '13

31 Jul '13

Hello, I've got 'Out of memory' error and corrupted database again, this time it's for 6.3 version. Steps: 1. Started server, started terminal client, checked there are no text and attribute indexes. 2. Started my Java application that runs several tests on database: querying, adding, removing. 3. Then I forgot to reopen terminal client and used the one that I opened in Step 1. 4. Run optimize command for the collection and got error. 5. Cannot open the collection any more as I'm getting 'Out of memory'. It's clear that I shouldn't have used the terminal client that I opened before execution of my Java application. But sometimes it's hard to remember. And it's completely unacceptable that these actions result in the corrupted database. You really should catch ArrayIndexOutOfBoundsException everywhere in order to save database from being corrupted. Terminal client stacktrace: > optimize Possible bug? Feedback is welcome: basex-talk(a)mailman.uni-konstanz.de BaseX 6.3: java.lang.ArrayIndexOutOfBoundsException: -1 org.basex.data.PathSummary.add(PathSummary.java:68) org.basex.core.cmd.Optimize.stats(Optimize.java:68) org.basex.core.cmd.Optimize.run(Optimize.java:34) org.basex.core.Command.run(Command.java:236) org.basex.core.Command.exec(Command.java:218) org.basex.core.Command.execute(Command.java:66) org.basex.server.ServerProcess.run(ServerProcess.java:161) > open products Out of Main Memory. Best regards, Ivan

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invalid collection name?
by C. M. Sperberg-McQueen 27 May '13

27 May '13

Using the GUI interface to BaseX 7.2, when I select Database / Open and Manage ..., I get a list of the databases I have built over the time I've been using BaseX. When I try to open the collection named MEP.bigbooks, though, I get an error box saying "Name 'MEP.bigbooks' is invalid." In the "Manage Databases" dialog box, the information about the collection appears normal and plausible (at least, the size is about what I expect, and so on). It's only when I try to open the collection that I run into the error. I get similar errors on other collections which have . in their name; I do not get errors when opening other collections built (as far as I can remember) at the same time from the same data, if their name does not include a full stop. When I try renaming the collection without the full stop, I get the same error message. When I try to issue the command ALTER DATABASE MEP.bigbooks MEPbigbooks from the server command area of the GUI, I get a short syntax summary in the Query Info area complaining about the syntax of the command. When I replace MEP.bigbooks with MEP\.bigbooks and "MEP.bigbooks", I also get syntax errors. If I close the GUI and just rename the directory within my BaseXData directory, the database appears to open normally. I think I have two questions: Q1 is just renaming the directory a safe way (assuming no server is currently working with the data) to rename a collection? Should I do the same for all the other collections I have that don't currently open? I assume that if the 7.2 GUI won't let me rename them, it also will have trouble deleting them, so a related question is: is just deleting a sub-directory of BaseXData a safe way to delete a collection? Q2 Did the rules for names of collections change? Or is there some other cause? Speaking for myself, I guess that as a user I haven't thought much about what characters should be allowed in collection names, but I may have assumed that if they are not unrestricted, they would be restricted to being legal NCNames. I do kind of like using dots in names, so you can count this as one vote for relaxing the naming rules at some convenient moment. It's not a really important point, of course. best, Michael -- **************************************************************** * C. M. Sperberg-McQueen, Black Mesa Technologies LLC * http://www.blackmesatech.com * http://cmsmcq.com/mib * http://balisage.net ****************************************************************

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Empty Initial Document Inconsistencies
by Dave Glick 05 Jul '12

05 Jul '12

Hello again, I've noticed some inconsistencies with regard to the initial document in an empty database. I understand that it is often treated as an indication that the database is "empty". I.e., if the database has only one node and it's a document at the first pre value, then Data.empty() returns true. The problem arises because the database isn't actually empty - it contains one empty document - and some commands/methods view it as an empty database while others treat it as a database with one empty document. Several examples: - The method Data.doc(name) will return -1 (indicating the document doesn't exist) while Data.docs() will return an array of size 1 with the first value a 0 (indicating there is one document at pre value 0). This is actually my own problem because the API I'm writing relies on these two methods being internally consistent - I can't have one telling me there is one document called "XYZ" but then have the other refuse to give me a pre value for the "XYZ" document I was just told exists. - The GUI shows a single doc node in the tree view but issuing the command "list [database name]" shows the database as having no resources. - I can evaluate the query "insert node 'text' into doc('[initial document name]')" and it executes. I can see the new text node under the initial document in the GUI tree view. Now when I issue the command "list [database name]" I see 1 resource. Having the list command report different numbers of resources before and after a XQuery insertion seems odd. - If I issue the command "ADD TO newdoc <xyz/>", I can see the new doc("newdoc") node with the child <xyz> element in the GUI but the previously empty document is now gone. This also seems odd - I'm not sure how I feel about an ADD command removing data from the database (even if it was just intended to be a placeholder). In the end, I think BaseX should support the notion of a database with one empty document as being valid - there are probably cases where one might want to start their session in that state. I'm not sure what the solution is or should be (or if it's even something that is worth or needs solving). My own preference would be for the internal indication of an empty database to use a different node kind dedicated for that purpose so there is no confusion whether the single node at pre 0 is an empty initial document or an indication of an empty database. At the very least, I think the inconsistencies above should be corrected - if a single empty document node is intended to signify an empty database and is not actually intended to be part of the database, then you should not see it in the GUI, not be allowed to insert content to it, etc. Dave

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deadlock in BaseXServer 6.2.7
by Godmar Back 23 Jun '12

23 Jun '12

Hi, we're observing that our BaseXServer 6.2.7 deadlocks. The stack traces are here: http://top.cs.vt.edu/~gback/bx/deadlock-6.2.7/basex-deadlock.txt Could you take a look to see if these ring any bells? Has this problem been addressed in a more recent version? - Godmar

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BaseX has been updated on Filecluster.com
by FileCluster Support 30 Apr '12

30 Apr '12

Dear Developer, You have received this email because we have updated BaseX and this was the contact email for the application. Your application update status BaseX has been updated on FileCluster.com to the 7.2.1 version. You can check out your application on our site at: http://www.filecluster.com/Business-Office/Database-Management/Download-Bas… If you want to let your users know about your software page on FileCluster.com, to rate it and review it, you can also use this banner to link it: Promote your software As a software website, it`s our duty to help the developers promote their software. Fortunatelly, our software promotions are cost free, for more informations please visit our promotion page. Submit your press releases We are also accepting press releases from software developers. All you have to do is to submit your press release and we will take care of the rest. Useful developer links All the essential links you need as a developer on FileCluster.com: Link to us - download banners or text links for linking to FileCluster.com Submit your software - Submit your software via PAD or manually Submit your press release - submit your press releases using our online form Contact Us - contact our editors Promote your software - our promotions page If you do not wish to receive any further notifications or confirmations from FileCluster.com, please send us an email and request a contact removal (email removal). Keep in mind that this means you will not receive ANY contact from us, including: software promotions, update confirmations or security alerts (antivirus and spyware test results). Regards, Renta Cezar - Senior Editor FileCluster Labs www.filecluster.com

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eval evil?
by Andy Bunce 29 Apr '12

29 Apr '12

Musing on the the usefulness of actions that update the database and return something, specifically in a web server with Xforms context, and the absence of XQuery scripting. I have been playing around with things like the following: let $s:=util:eval(' let $x:=copy $c:=db:open("listman","1.xml") modify (replace value of node $c/updated with current-dateTime()) return $c return db:replace("listman","1.xml",$x) ') return db:open("listman","1.xml") This works, but is it likely to stop working in the future? Is there a better way? /Andy

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Release 7.2.1: The Spring Edition
by Christian Grün 27 Apr '12

27 Apr '12

Dear all, once more, we are proud to announce a new version of BaseX! And once more, we can provide you with a whole bunch of new features: * Our value indexes now support string-based range queries: http://docs.basex.org/wiki/Indexes#Value_Indexes A big thank you to our sponsors who made this possible! * Our new XQJ API is based on Charles Foster's implementation. It fully utilizes the client/server architecture: http://xqj.net/basex * Import of XQuery modules has been simplified: http://docs.basex.org/wiki/Repository * Simplified invocation of Java code from XQuery: http://docs.basex.org/wiki/Java_Bindings * Full support for the XQuery 3.0 Regular Expressions syntax: http://www.w3.org/TR/xpath-functions-30/#regex-syntax * Updating functions can now return values: http://docs.basex.org/wiki/Database_Module#db:output * Unified handling of document and database URIs: http://docs.basex.org/wiki/Databases#Access_Resources * Pinning of opened database replaced by filesystem locking: http://docs.basex.org/wiki/Transaction_Management#Locking * REST, RESTXQ, WebDav: concurrency issues fixed As usual, we are looking to your feedback. Have fun, Christian BaseX Team http://basex.org

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Add a spatial index ?
by Haderer Nicolas 27 Apr '12

27 Apr '12

Hello I'am a phd student and i explore actually multiples no-sql solutions to store and process location data such as gml or gpx. I have already familiar with BaseX, and the combinaison XML/XQuery providing the flexibility needed for my project. However, process spatial data need spatial index such as R-tree in order to be processed efficiently. I would like to know if an implementation of spatial index into BaseX exist or are in project ? And if not, does the BaseX architecture allow to add new index easily ? Best regard Haderer Nicolas

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Fwd: Usin Basex for Desktop Application
by Lukas Kircher 26 Apr '12

26 Apr '12

Hi Anand, forwarding this to the list ... Regards, Lukas ---------- Forwarded message ---------- From: Anand Chiney <anandc.air(a)gmail.com> Date: Thu, Apr 26, 2012 at 10:25 AM Subject: Re: [basex-talk] Usin Basex for Desktop Application To: Lukas Kircher <lukaskircher1(a)googlemail.com> Hi Lukas, I want to know about the *maximum number of documents* that can be stored in the database and *Max. Size per Document... *I am planning to use baseX for my application which contains Resumes in XML format as data.* Also I am quite eager to know how will I UPDATE THE DB with new resumes..... * Have a nice day Regards Anand * * On Tue, Mar 27, 2012 at 2:54 PM, Lukas Kircher <lukaskircher1(a)googlemail.com > wrote: > Hi, > > It's generally possible to use BaseX as a standalone application. > You could start by taking a look at our local BaseX API examples > [1] in our documentation. > > Feel free to contact us, if you need any assistance. > > Regards, > Lukas > > [1] http://docs.basex.org/wiki/Java_Examples > > > > On Tue, Mar 27, 2012 at 9:29 AM, Sandeep Yohans <sandeepy.air(a)gmail.com>wrote: > >> Hello Sir/Madam, >> >> I am interested in using BaseX for my Desktop Application which I am >> developing using Java SE. >> >> Is it possible to use BaseX in a Desktop Application (Standalone >> Application) which will be installed on a computer with no internet >> connection or intranet? >> >> Looking forward to hear from you. >> >> -- >> Sandeep Yohans >> >> Developer >> AIR Infotech >> Nagpur - India >> www.airinfotech.in >> >> >> _______________________________________________ >> BaseX-Talk mailing list >> BaseX-Talk(a)mailman.uni-konstanz.de >> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >> >> > -- Regards Have a nice day :) Anand Chiney

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a possible enhancement to program exit
by C. M. Sperberg-McQueen 24 Apr '12

24 Apr '12

In BaseX 7.2 just now, I pressed Command-Q to quit the program. My query had changed, so the program put up a dialog box to ask "Save changes to file?" with buttons for Yes, No, and Cancel. As I looked at the dialog box, I noticed that the query in question was not the one I had thought it was (for a project I was closing down) but a different one (the project I was intending to focus on next). So I didn't want to quit the program after all. I clicked on Cancel, expecting that my request to shut BaseX down would be canceled and BaseX would continue running with my query file still in place. But in fact BaseX exited anyway. As far as I can tell, it didn't save the query (no great loss, in this case, I think), so that Cancel effectively had the same effect as No. It's been a long time since I read anything about standard user interface idioms, so I don't want to go so far as to say that this is a bug. But it did surprise me, and so I suggest that it might be helpful to make the Cancel button in this dialog box cancel the quit action. Consider it a request for enhancement. Thanks! Michael -- **************************************************************** * C. M. Sperberg-McQueen, Black Mesa Technologies LLC * http://www.blackmesatech.com * http://cmsmcq.com/mib * http://balisage.net ****************************************************************

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BaseX-Talk April 2012