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• Performance impact of not implementing relationships at the database level?

  - by JVerstry

  Let's imagine a data model with customers and invoices. There is a 1 to n relationship between a customer and its invoices. We uses an ORM (like Hibernate). One can explicitely implement the 1-n relationship (using JPA for example) or not. If not, then one must do a bit more work to fetch invoices. However, it is much easier to maintain, improve and develop the data model of applications where relationships between objects are not explicitely implemented in the database. My question is, has anyone noticed a significant performance impact when not implementing the relationships in the database?

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• Fiscal quarter vs calendar quarter

  - by Geotarget

  I'm building a Date/Time class with a "configurable quarter" system as follows. User specifies which month the quarter starts at (config) Set of functions to deal with quarters (next quarter, prev quarter, etc) All quarter functions respect the config Now this class is primarily to be used for fiscal quarter calculations. So assuming I have this class with a configurable "quarter" system, would I need another parallel set of functions for calendar quarters too? What are the applications for calendar quarters anyways? By calendar quarters I mean where Q1 is Jan-Mar, and Q4 is Oct-Dec. By fiscal quarters I mean whatever standard your Country uses (in India Q1 starts in April)

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• Microsoft veut connecter producteurs de données et développeurs webs avec un SDK pour son protocole

  Un SDK pour l'Open Data Protocol et une CTP2 pour Dallas Microsoft tente de mettre en contact producteurs de données et développeurs de services webs Pour concevoir des services webs, il faut des données. C'est à ce problème que Microsoft entend apporter une solution avec l'Open Data Protocol et Dallas, une place de marché qui s'appuie sur la plateforme Web Microsoft Azure. Pour pouvoir concevoir des applications (mobiles, Web et multiplateformes) capables d'utiliser des données en provenance du Cloud, Microsoft a décidé de mettre à disposition développeurs des SDK (kits de développement logiciel ) pour OData. L'approche est fondée sur Atom et HTTP pour la portabilité des ...

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• Why is 'libgnomevfs' files under /usr/include/gnome-vfs-2.0?

  - by George Edison

  Most applications, including the gnomevfs headers themselves, expect the files to be under /usr/include/libgnomevfs, but Ubuntu has them under /usr/include/gnome-vfs-2.0/libgnomevfs. Why? The package I'm referring to is called libgnomevfs2. Inside /usr/include/gnome-vfs-2.0/libgnomevfs/gnome-vfs.h` we find: #include <libgnomevfs/gnome-vfs-acl.h> #include <libgnomevfs/gnome-vfs-address.h> #include <libgnomevfs/gnome-vfs-async-ops.h> #include <libgnomevfs/gnome-vfs-cancellation.h> ... Meaning that even the headers themselves expect the files to be in that location - and nothing that includes this file will work. Am I missing something, or is this a glitch?

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• How to get familiar with "what happens underneath of Java"?

  - by FidEliO

  I did not study CS nor IT. I just became a developer, now working with Java. Actually, since I now work with a big company writing high-scalable web applications, I think I need to be better with details. I have no understanding of what happens underneath of Java. Java Performance, Server-Side Java might be the buzz words?!! I am very poor with those more of low-level details but I do not know where to look honestly. I started looking for some keywords in Amazon, ended up reading books like "pragmatic programmer", "clean code", "code complete" which IMO they are not what I am looking for. Could you please give me some learning resources (books, articles, blog posts, online trainings) for this matter? I also read this post as well: Approaching Java/JVM internals But I think I need a pre-step before jumping into the OpenJDK, right?!

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• Installing g77 in Ubuntu 12.04 LTS (32bit)

  - by pksahani

  I am using Ubuntu 12.04 LTS (32bit-i386) in my desktop PC. I need g77 compiler for some specific applications. The app can only be installed after having g77 compiler. This specific app is designed based on g77 fortran compiler and can't be used with gfortran which is the standard available compiler in 12.04 LTS. And guide me the procedure to install g77 in 12.04. I have been trying apt-get update & apt-get install g77 after changing the sources.list file. After processing I am able to install g77 but when i try to compile a fortran program, it shows error /usr/bin/ld: cannot find crt1.o: No such file or directory /usr/bin/ld: cannot find crti.o: No such file or directory /usr/bin/ld: cannot find -lgcc_s collect2: ld returned 1 exit status Please help me. I m struggling a lot to fix this.

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• Exalytics at Partners in EMEA

  - by Mike.Hallett(at)Oracle-BI&EPM

  Many partners have got Oracle Exalytics systems on their premises where they can help customers with proof-of-solution demonstrations to show how fast this engineered in-memory analytics solution can be, and how this translates into tangible business benefits.  Any customer with Oracle Analytics (OBIEE, Essbase, Hyperion Planning, Oracle BI-Applications) who is seeking to upgrade their hardware infrastructure, looking for a quick, low risk and cost effective implementation, should contact one of these to test what an Exalytics can do for them. Below is a list of some of our specialist Oracle Partners who have an Exalytics: http://www.arrowecs.fr/produits/index.php?id=82 France http://www.ise-informatik.de/ Germany http://www.hotitem.nl/ Netherlands http://bi.fors.ru/ Russia http://www.synchrotech-group.com/ Switzerland http://www.linkplus.com.tr/ Turkey http://www.rittmanmead.com/ UK

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• MammothVPS launches Backups, DNS Management and more!!!

  - by stefan.sedich

  Yesterday we launched a bunch of new features over at MammothVPS, - All VPS' now have an on-site, off-server backup facility available to them. By default all customers will have 1 free weekly backup made available to them, and should you wish to you can purchase more slots which are available in daily, weekly and monthly schedules. - DNS hosting has been made available and will be free for all customers. You can find the new interface in your mPanel. - A cleanup of the menu system has been done to make it easier to navigate around both the site and mPanel. - You will find new sections on site, we now have more information about our services and have included things like a Knowledge Base, which will provide information on howto setup various applications on your VPS. - Added the ability to change the kernel your VPS is running on. So head on over to MammothVPS and check it out.

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• Gnome/X logs off immediately after login -- which logfiles are relevant?

  - by joebuntu

  I've been tinkering with fingerprint-gui as well as X/xrandr resolution settings. When I start my machine, it boots up normally. As soon as X and gnome have finished starting, it logs me off automatically and brings me back to the gdm login prompt with the user list. Then I am, however, able to log in using "Ubuntu Desktop Fail-safe". I've checked the list of start-up applications, but everything seems fine there. I can't yet put my finger on what exactly might be responsible for this: X, gnome or some messed up pam.d settings. So far I've checked /var/logs/X11/xorg.0.log, /var/logs/auth.log and ~/.xsession-errors. In addition, I don't quite seem to understand the "interplay" between X, GDM, GNOME, GNOME-policykit, PAM.d and all that. Are there any other relevant log files that could point me to what's broken? Specs: Ubuntu 10.10 Maverick Meerkat IBM/Lenovo Thinkpad R60, ATI Radeon x1400 Mobility all updates installed Linux User 1 year+,

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• Logout/Shutdown taking very long, how to find the problem?

  - by user67928

  Some months now, it's taking very long to logout/shutdown/reboot my ubuntu box. it doesn't happen with a fresh profile it still takes ages even when i close all running programs first (foreground programs) sometimes a couple of applications are closed before the waiting time (eg. chrome, music player) it happened with 11.10 and now 12.04 i did a fresh install of 12.04 but reinstalled all my programs and application settings/profiles (eg. chrome profile, music db, .bashrc etc.), still no solution it happens only when i use the gnome way of rebooting/shutting down/logging out when issuing "sudo reboot" in the terminal, there is no waiting time there is no process eating CPU time i have not found any evidence what is causing this whatsoever i'm using "gnome-fallback" (gnome classic 2D) what actions does gnome execute when clicking on eg. logout exactly? i want to trace these steps any help is appreciated very much!

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• Consulting Expertise

  - by Oracle OpenWorld Blog Team

  Consult with the Experts Onsite at Oracle OpenWorld by Karen Shamban Learn from Oracle Consulting experts how to maximize the value of your Oracle investments by attending one or more Oracle Consulting sessions. Topics include cloud architecture and implementations, Engineered Systems best practices, Oracle Fusion Applications migrations, and more. Or, stop by the Oracle Consulting Center or the Demo Stations in the Exhibition Halls to ask specific questions and get additional information. Are you an IT executive or enterprise architect?  Register for the information-packed Enterprise Architecture Summit on Wednesday, October 12. To see the full range of Oracle Consulting activities at Oracle OpenWorld, click here.

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• What does it mean to "have experience with the Unix/Linux command line"? [closed]

  - by Aerovistae

  I'm a new comp sci grad applying to jobs, and this requirement confuses me, especially since the job description (Python back-end developer) says it's the single most important thing ("Everything else we can teach you!") I mean, I know how to use the command line... I know your standard run-of-the-mill stuff like navigating around and manipulating files and permissions and using pipes and running applications, but what are they looking for when they say something like that? I'm aware there's no end to what you can do with the command line, but I was under the impression that after a certain point it's the sort of thing that only benefits server/system administrators.

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• Why creating a new MDX language instead of extending SQL?

  - by DReispt

  I have a long experience with SQL, but recently began working with datawarehouse and OLAP technologies: building fact and dimension tables, that then are queried using MDX (MultiDimensional eXpressions). The problem is that MDX works with a completely different logic compared to SQL, and it's a whole new learning curve even for someone with a strong SQL background. Yes, MDX allows you to do things that would be hard or almost impossible with plain SQL. But sometimes it's frustrating to be hours around an MDX to do something you know you could achieve in minutes using SQL (ok, you can tell me to RTFM ...). But why go on to the trouble of creating a new completely different language when you could build on SQL, extend it to add the features needed by OLAP applications?

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• Office 2011 : Microsoft publie le Service Pack 2 pour Mac, qui améliore les performances et corrige des problèmes critiques

  Office 2011 : Microsoft publie le Service Pack 2 pour Mac qui améliore les performances et corrige des problèmes critiques Microsoft vient de publier un Service Pack 2 (SP) pour la dernière version de sa suite bureautique Office 2011. Cette mise à jour apporte de nombreux correctifs et des améliorations pour Office 2011 Mac, et résout les problèmes d'incompatibilité avec Mac OS X Lion. Le SP 2 offre aux applications de la suite une meilleure prise en charge du service de stockage Cloud de Microsoft Skydrive avec un accès aux documents se trouvant à la racine d'un dossier sur le service en ligne. Le mode plein écran de Lion est maintenant disponible pour toutes les ...

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• exchange live feed with pre-recorded video for wireless internet camera to router

  - by nate

  I wasn't sure if this should be asked in Web Applications, or Network Engineering, or what... Long story short, I have a video camera with mic that is wirelessly connected to a router (NETGEAR R6200), which can then be viewed through an online service. I would like to be able to somehow exchange the live feed with a pre-recorded video, or image, preferably with pre-recorded sound (the sound of silence would be easiest). Can I place this inbetween the camera and the router, do I need to redirect the camera feed to my laptop first, and then push out the fake video/audio onto the router, without the service knowing the difference? Thanks much and I hope this is well understood!

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• Is there an industry standard for systems registered user permissions in terms of database model?

  - by EASI

  I developed many applications with registered user access for my enterprise clients. In many years I have changed my way of doing it, specially because I used many programming languages and database types along time. Some of them not very simple as view, create and/or edit permissions for each module in the application, or light as access or can't access certain module. But now that I am developing a very extensive application with many modules and many kinds of users to access them, I was wondering if there is an standard model for doing it, because I already see that's the simple or the light way won't be enough.

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• Can't open Minecraft with java

  - by Shingaling

  I know this has been asked here before, but none of the solutions have worked for me. I have a fresh install of Ubuntu 12.04 on my system and I installed Open Java 7 and I downloaded Minecraft. I right clicked Minecraft went to properties and set it as an executable and then went to open with and Java is no where to be found in the list. I made a new Java desktop file in /usr/share/applications and now when I go to the list Java is there and I set Minecraft to open with it by default but when I open it nothing at all happens. Now how am I supposed to get Minecraft to work?

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• Triple Monitor Setup with Nvidia and Compiz

  - by AndrewX192

  I have a triple monitor setup with two video cards on Ubuntu 10.04. I have the monitors and graphics cards currently setup as follows: Nvidia Geforce 210 #1 - 1920x1080 Monitor (Twinview) [Center - Monitor #1] - 1920x1080 Monitor (Twinview) [Right - Monitor #2] Nvidia Geforce 210 #2 - 1920x1080 Monitor (Separate X Screen) [Left - Monitor #3] This works fine, except when I open a program, it shows up in between monitor #1 and #2 - meaning I have to drag it to one screen before I can use the window. Gnome2's gnome-panel also does not work on the twinview setup; it spans between both monitors, but it does not redraw (ex: the clock never changes). In addition, when I maximize an application, it spans both monitors, which is not acceptable. When I enable Xinerama for my setup, gnome-panel no longer spans two monitors, and applications maximize as expected, but compiz does not work, as X11 compositing is not available. The lack of desktop compositing causes problems with dragging windows between screens (redraws take forever). Is there anything I can do to fix these issues without opting for different graphics cards?

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• Oracle Joins OpenDaylight Project, Plans to Integrate OpenDaylight SDN Capabilities Into Oracle Solaris

  - by CarylTakvorian-Oracle

  Good news for our Telco ISV partners who want to leverage virtualization technologies such as SDN and NFV: We just announced that Solaris 11.2 will integrate OpenDaylight SDN, and that Oracle will join the OpenDaylight project as a Silver member. The integration will allow customers to improve service quality and take advantage of apps-to-disk SLAs through compatibility with a wide range of SDN devices, applications and services. It will also allow them to use a common and open SDN platform with OpenStack to manage Oracle Solaris-based clouds. The OpenDaylight Project is a community-led and industry-supported open source platform to advance SDN and Network Functions Virtualization (NFV).

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• Dash empy and blank Software Center

  - by fra_casula

  I've Ubuntu 12.10.1 LTS x62 fresh of installation... My dash is empty, search doesn't work and applications list is empty. If I run the Ubuntu Software Center it freeze in a blank screen. I tried with: restart reinstall of unity packages deleting ~/.local/share/zeitgeist folder other tricks found in the other askubuntu answers UPDATE: From ~/.xsession-errors I/O warning : failed to load external entity "/home/francesco/.compiz/session/10699c9c27649d05db134910329935534100000027470033" Initializing session options...done (compiz:2813): GConf-CRITICAL **: gconf_client_add_dir: assertion `gconf_valid_key (dirname, NULL)' failed ** (zeitgeist-datahub:3070): WARNING **: zeitgeist-datahub.vala:227: Unable to get name "org.gnome.zeitgeist.datahub" on the bus! EDIT: Deleting .cache folder solves the Ubuntu Software Center blank screen issue, thanks to jokerdino!!

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• Toutes les semaines un peu de code pour aller plus loin avec Windows 7, Application Recovery & Restart

  En cette fin d'année, la communauté de Developpez.com s'est alliée avec Microsoft France pour relayer une série de questions / réponses sur le développement Windows 7. A partir d'aujourd'hui, nous poserons une question chaque lundi sur une fonctionnalité propre au développement d'applications Windows 7. La bonne réponse de la question de la semaine sera ensuite dévoilée la semaine suivante avec un exemple de mise en pratique. Êtes-vous prêt à relever le défi ? Pensez-vous bien connaître les possibilités que proposent les API Windows 7 ? C'est ce que nous allons voir dès aujourd'hui, nous attendons vos propositions ! La réponse de la semaine : Quelle est la technologie qui per...

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• Cloud Migration Lifecycle

  - by llaszews

  The first step in migrating to the cloud is the set up phase. This phase includes: 1. Plan Cloud Setup - Create a project plan. 2. Set up infrastructure - The IaaS and PaaS environments need to be installed and configured. This includes databases, network, hardware, disk and application servers. 3. Set up shared components - Are applications, database objects or other components going to be made accessible in the cloud ? These shared components need to be configured and made accessible. 4. Set up self-service portal - Customer self service provisioning, management and monitoring.

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• Installing package + dependancies and removing them all

  - by Sman789

  I currently use Xubuntu and was considering installing/trying GNOME Shell or Cinnamon by installing their respective metapackage. However, doing so would result in a massive number of dependencies being installed which would be almost impossible to remove individually at a later date if I decided I didn't like it. I wonder, therefore, if there is a way that I can track which packages Synaptic automatically downloads as part of the process and create a script of some sort to remove them all as well. I could then rest assured that if I don't like any of my new desktop environments, I can remove them in full without leaving a load of other applications and libraries lying around. Thankyou for any help! :)

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• Les éditeurs allemands s'opposent à la dictature éditoriale d'Apple, qui censure les App de certains

  Mise à jour du 15.03.2010 par Katleen Les éditeurs allemands s'opposent à la dictature éditoriale d'Apple, qui censure les App de certains magazines Après Opera et Mozilla (voir news précédente), ce sont désormais deux gros éditeurs allemands qui montent au créneau contre la ?police morale? d'Apple, comme ils l'appellent. En effet, les applications de deux magazines comptant parmi les plus importants d'Allemagne ont été censurées. Stern et Bild sont deux journaux d'information, un peu orientés people, qui sortent chaque semaine à très fort tirage (plus d'un million d'exemplaire chacun). Du jour au lendemain, et sans aucun avertissement préalable, la firme à la pomme a su...

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• JavaOne 2012: JDBC Community Discussion

  - by sowmya

  At JavaOne2012, Mark Biamonte of DataDirect Technologies and Lance Andersen of Oracle organized a discussion about JDBC. To learn more about using JDBC to develop database applications, see the JDBC trail in the Java Tutorials. You will know how to use the basic JDBC API to * create tables * insert values into them * query the tables * retrieve the results of the queries * update the tables In this process, you will learn how to use simple statements and prepared statements, and see an example of a stored procedure. You will also learn how to perform transactions and how to catch exceptions and warnings. - Sowmya

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