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  • Predicting advantages of database denormalization

    - by Janus Troelsen
    I was always taught to strive for the highest Normal Form of database normalization, and we were taught Bernstein's Synthesis algorithm to achieve 3NF. This is all very well and it feels nice to normalize your database, knowing that fields can be modified while retaining consistency. However, performance may suffer. That's why I am wondering whether there is any way to predict the speedup/slowdown when denormalizing. That way, you can build your list of FD's featuring 3NF and then denormalize as little as possible. I imagine that denormalizing too much would waste space and time, because e.g. giant blobs are duplicated or it because harder to maintain consistency because you have to update multiple fields using a transaction. Summary: Given a 3NF FD set, and a set of queries, how do I predict the speedup/slowdown of denormalization? Link to papers appreciated too.

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  • Is there any way to disable write-access to source code from within Xcode?

    - by Kapil Kapre
    Is there any easy solution to prevent Xcode from writing to source files in a project? I want to edit source files externally and only use Xcode for debugging and so I want to prevent any accidental modifications getting saved via xcode. (Obviously I want Xcode to pickup external changes to files when I build/debug) One possible solution that I thought of was to enable app sandbox entitlements on xcode and manually maintain a list of directories that it should not write to. Is this feasible? Any other ideas? On the sandboxing thing, I'm not sure if Xcode is disqualified as per Apple's Sandboxing Requirements.

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  • How to know my free disk space on web hosting server?

    - by Abu
    I have got some work from my friend for updating his website. Earlier his website was made by some other person and he used to maintain all the stuff. Now that developer has given only the ftp username and password to my friend. He asks me to update his website. But the problem is I don't know how to access the things for this particular web hosting account like knowing the available free space, accesing email account, etc. I asked him about website control panel but he says that he doesn't know about. Is there any other site/client program/control panel that I can use to manage that website. So can any one help me out?

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  • How is technical debt best measured? What metric(s) are most useful?

    - by throp
    If I wanted to help a customer understand the degree of technical debt in his application, what would be the best metric to use? I've stumbled across Erik Doernenburg's code toxicity, and also Sonar's technical debt plugin, but was wondering what others exist. Ideally, I'd like to say "system A has a score of 100 whereas system B has a score of 50, so system A will most likely be more difficult to maintain than system B". Obviously, I understand that boiling down a complex concepts like "technical debt" or "maintainability" into a single number might be misleading or inaccurate (in some cases), however I need a simple way to convey the to a customer (who is not hands-on in the code) roughly how much technical debt is built into their system (relative to other systems), for the goal of building a case for refactoring/unit tests/etc. Again, I'm looking for one single number/graph/visualization, and not a comprehensive list of violations (e.g. CheckStyle, PMD, etc.).

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  • Announcing: Oracle Database 11g R2 Certification on Oracle Linux 6

    - by Monica Kumar
    Oracle Announces the Certification of the Oracle Database on Oracle Linux 6 and Red Hat Enterprise Linux 6 Yesterday we announced the certification of Oracle Database 11g R2 with Oracle Linux 6 and Unbreakable Enterprise Kernel. Here are the key highlights: Oracle Database 11g Release 2 (R2) and Oracle Fusion Middleware 11g Release 1 (R1) are immediately available on Oracle Linux 6 with the Unbreakable Enterprise Kernel. Oracle Database 11g R2 and Oracle Fusion Middleware 11g R1 will be available on Red Hat Enterprise Linux 6 (RHEL6) and Oracle Linux 6 with the Red Hat Compatible Kernel in 90 days. Oracle offers direct Linux support to customers running RHEL6, Oracle Linux 6, or a combination of both. Oracle Linux will continue to maintain compatibility with Red Hat Linux. Read the full press release. 

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  • Learn All About MySQL Cluster

    - by Antoinette O'Sullivan
    Just released - the all new MySQL Cluster training course. This MySQL Cluster training teaches you how to install and configure a real-time database cluster at the core of your application. Expert instructors will teach you how to design and maintain your clusters for high availability and scalability by using MySQL Cluster's open-source and enterprise components. This 4-day training course is a must for those who want to learn about MySQL Cluster as you will not only learn about the concepts and features but you will get extensive hands-on experience. You can follow this training course from your own desk via a live-virtual training or by traveling to an education center to follow this course. Be the first to influence the schedule for this newly released course by registering your interest on the Oracle University portal. For more information about the authentic MySQL curriculum, go to http://education.oracle.com/mysql

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  • Oracle Response to Apache Departure from JCP

    - by Henrik Ståhl
    Last month Oracle renominated Apache to the Java Executive Committee because we valued their active participation and perspective on Java. Earlier this week, by an overwhelming majority, the Java Executive Committee voted to move Java forward by formally initiating work on both Java SE 7 and SE 8 based on their technical merits. Apache voted against initiating technical committee work on both SE 7 and SE 8, effectively voting against moving Java forward. Now, despite supporting the technical direction, Apache have announced that they are quitting the Executive Committee. Oracle has a responsibility to move Java forward and to maintain the uniformity of the Java standard for the millions of Java developers and the majority of Executive Committee members agree. We encourage Apache to reconsider its position and remain a part of the process to move Java forward. ASF and many open source projects within it are an important part of the overall Java ecosystem. Adam Messinger, Vice President of Development

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  • Codeigniter Open Source Applications for Coding References

    - by Hafizul Amri
    I choose codeigniter to be my first framework to work with. Now I'm looking for open source applications built based on this framework to be my references for good coding practices and standards. From my previous experiences in application development, it was hard for me to maintain, upgrade, or modify existing applications due to my bad coding practices. Do you have any suggestion of application based on codeigniter framework for me to be referred? So that it can help me to write better coding by referring to their good and maybe best coding pratices. Thank you!

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  • IBM Keynote: (hardware,software)–>{IBM.java.patterns}

    - by Janice J. Heiss
    On Sunday evening, September 30, 2012, Jason McGee, IBM Distinguished Engineer and Chief Architect Cloud Computing, along with John Duimovich IBM Distinguished Engineer and Java CTO, gave an information- and idea-rich keynote that left Java developers with much to ponder.Their focus was on the challenges to make Java more efficient and productive given the hardware and software environments of 2012. “One idea that is very interesting is the idea of multi-tenancy,” said McGee, “and how we can move up the spectrum. In traditional systems, we ran applications on dedicated middleware, operating systems and hardware. A lot of customers still run that way. Now people introduce hardware virtualization and share the hardware. That is good but there is a lot more we can do. We can share middleware and the application itself.” McGee challenged developers to better enable the Java language to function in these higher density models. He spoke about the need to describe patterns that help us grasp the full environment that an application needs, whether it’s a web or full enterprise application. Developers need to understand the resources that an application interacts with in a way that is simple and straightforward. The task is to then automate that deployment so that the complexity of infrastructure can be by-passed and developers can live in a simpler world where the cloud can automatically configure the needed environment. McGee argued that the key, something IBM has been working on, is to use a simpler pattern that allows a cloud-based architecture to embrace the entire infrastructure required for an application and make it highly available, scalable and able to recover from failure. The cloud-based architecture would automate the complexity of setting up and managing the infrastructure. IBM has been trying to realize this vision for customers so they can describe their Java application environment simply and allow the cloud to automate the deployment and management of applications. “The point,” explained McGee, “is to package the executable used to describe applications, to drop it into a shared system and let that system provide some intelligence about how to deploy and manage those applications.”John Duimovich on Improvements in JavaMcGee then brought onstage IBM’s Distinguished Engineer and CTO for Java, John Duimovich, who showed the audience ways to deploy Java applications more efficiently.Duimovich explained that, “When you run lots of copies of Java in the cloud or any hypervisor virtualized system, there are a lot of duplications of code and jar files. IBM has a facility called ‘shared classes’ where we put shared code, read only artefacts in a cache that is sharable across hypervisors.” By putting JIT code in ahead of time, he explained that the application server will use 20% less memory and operate 30% faster.  He described another example of how the JVM allows for the maximum amount of sharing that manages the tenants and file sockets and memory use through throttling and control. Duimovich touched on the “thin is in” model and IBM’s Liberty Profile and lightweight runtime for the cloud, which allows for greater efficiency in interacting with the cloud.Duimovich discussed the confusion Java developers experience when, for example, the hypervisor tells them that that they have 8 and then 4 and then 16 cores. “Because hypervisors are virtualized, they can change based on resource needs across the hypervisor layer. You may have 10 instances of an operation system and you may need to reallocate memory, " explained Duimovich.  He showed how to resize LPARs, reallocate CPUs and migrate applications as needed. He explained how application servers can resize thread pools and better use resources based on information from the hypervisors.Java Challenges in Hardware and SoftwareMcGee ended the keynote with a summary of upcoming hardware and software challenges for the Java platform. He noted that one reason developers love Java is it allows them to ignore differences in hardware. He stated that the most important things happening in hardware were in network and storage – in developments such as the speed of SSD, the exploitation of high-speed, low-latency networking, and recent developments such as storage-class memory, and non-volatile main memory. “So we are challenged to maintain the benefits of Java and the abstraction it provides from hardware while still exploiting the new innovations in hardware,” said McGee.McGee discussed transactional messaging applications where developers send messages transactionally persist a message to storage, something traditionally done by backing messages on spinning disks, something mostly outdated. “Now,” he pointed out, “we would use SSD and store it in Flash and get 70,000 messages a second. If we stored it using a PCI express-based flash memory device, it is still Flash but put on a PCI express bus on a card closer to the CPU. This way I get 300,000 messages a second and 25% improvement in latency.” McGee’s central point was that hardware has a huge impact on the performance and scalability of applications. New technologies are enabling developers to build classes of Java applications previously unheard of. “We need to be able to balance these things in Java – we need to maintain the abstraction but also be able to exploit the evolution of hardware technology,” said McGee. According to McGee, IBM's current focus is on systems wherein hardware and software are shipped together in what are called Expert Integrated Systems – systems that are pre-optimized, and pre-integrated together. McGee closed IBM’s engaging and thought-provoking keynote by pointing out that the use of Java in complex applications is increasingly being augmented by a host of other languages with strong communities around them – JavaScript, JRuby, Scala, Python and so forth. Java developers now must understand the strengths and weaknesses of such newcomers as applications increasingly involve a complex interconnection of languages.

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  • GPL the Dark Side

    - by EmbeddedInsider
    This blog is about the GPL Issues nobody talks about.  Its about the evil inherent in the GPL License. Evil?  But did not someone tell us that "open" is good?  Well, yes, and I might agree. It just depends on what we mean by 'open'.   There are many kinds of 'open' license, and many of these I like.  But  I maintain the GPL; the principle license of the Open Source Software Foundation, is most certainly NOT open for business.  And to the extent that software is conceived, developed, and maintained business, not hobbyists, the GPL is very, very evil. Controversial? You bet.  Flame away please. Lawrence Ricci www.EmbeddedInsider.com

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  • Thoughts of Cloud Development/Google App Engine

    - by jiewmeng
    I use mainly PHP for web development, but recently, I started thinking about using Google App Engine. It doesn't use PHP which I am already familiar with, so there will be a steeper learning curve. Probably using Python/Django. But I think it maybe worthwhile. Some advantages I see: Focus on App/Development. No need to setup/maintain server ... no more server configs Scales automatically Pay for what you use. Free for low usage Reliable, it's Google after all Some concerns though: Does database with no joins pose a problem for those who used App Engine before? Do I have to upload to Google just to test? Will it be slow compared to testing locally? What are your thoughts and opinions? Why would you use or not use App Engine?

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  • Automated deployment/installation of development tools

    - by thegreendroid
    My team is looking to automate installation/deployment of all of our development tools. The main driver for this is to ensure that everyone in the team has a consistent development environment setup and to also allow a new recruit to get up and running easily. By development environment I mean tools like SCM, toolchains, IDEs etc. and by consistent I mean everyone using the same version of compiler to build code (this is very important!). Here are a few of our requirements – Allow unattended (silent) install of our entire dev setup by running a single script Ability to deploy selective updates (new versions) for specific tools Ability to report which tools are installed and their specific version numbers Must work on Windows (Linux would be a bonus) Must be easy to maintain What are some of the tools that you've used to automate such a task?

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  • Cooperator Framework

    - by csharp-source.net
    Cooperator Framework is a base class library for high performance Object Relational Mapping (ORM), and a code generation tool that aids agile application development for Microsoft .Net Framework 2.0/3.0. The main features are: * Use business entities. * Full typed Model (Data Layer and Entities) * Maintain persistence across the layers by passing specific types( .net 2.0/3.0 generics) * Business objects can bind to controls in Windows Forms and Web Forms taking advantage of data binding of Visual Studio 2005. * Supports any Primary Key defined on tables, with no need to modify it or to create a unique field. * Uses stored procedures for data access. * Supports concurrency. * Generates code both for stored procedures and projects in C# or Visual Basic. * Maintains the model in a repository, which can be modified in any stage of the development cycle, regenerating the model on demand.

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  • New to Java and Spring. What are some good design principles for an inexperienced java developer like me?

    - by Imtiaz Ahmad
    I am learning Java and have written a few small useful programs. I am new to spring but have managed to understand the concept of dependency injection for decoupling. I'm trying to applying that in my development work in an enterprise setting. What are the 3 most important design patterns I should master (not for interview purposes but ones that I will use every day in as a good java developer)? Also what are some good java design considerations and practices in coding specifically in Java? My goal is write good decoupled and coherent programs that are easy to maintain that don't make me standout as a java rookie. Stuff like not beginning my package names with com. have already made me precariously visible in my team. But they know I have 2 years of coding experience and its not in java.

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  • Should security updates 'always' be installed?

    - by kmansoor
    We are a small shop, no real sysadmin. So developers (Java EE) also try to maintain Ubuntu server 12.0.4. When I login a terminal and I see messages like: 6 packages can be updated. 6 updates are security updates. Should all security updates always be installed? can some be ignored? Should these be acted upon immediately? Or one could wait for 2:00 AM coming Sunday? Is there a way to know a 'critical' update? Is there a good sysadmin for dummies resource I should be reading?

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  • What is the best solution for document archiving?

    - by Anders Wallenquist
    I'm looking for a utility that helps me (and my colleagues) to archive documents in a systematic manner (Like Zeitgeist but permanent). The utility have to clean-out old document from desktops and store them on a server (as automatic as possible and consistent) maybe from just a few locations (Document directory) Documents shall be stored on cheap large media for many years to come - hard disk and file system maybe? Easy to maintain and manage for a small organization. Documents have to be easy to find and restore One systematic manner could be a directory-structure by year, month, user or user, year, month. Its a plus if documents could be linked to a project, if documents could be search-able and if document could also be mail, IM-discussions not only OpenOffice traditional documents. Any ideas?

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  • 7 Tips to Get the Most Out of BleachBit, a “CCleaner for Linux”

    - by Chris Hoffman
    Like CCleaner on Windows, BleachBit frees space by deleting unimportant files and helps maintain your privacy by deleting sensitive data. And, just like CCleaner, there’s more you can do with BleachBit than just clicking a single button. BleachBit is available in Ubuntu’s Software Center and most other Linux distributions’ software repositories. You can also download it from the BleachBit website – it even runs on Windows, too. HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux Hack Your Kindle for Easy Font Customization

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  • extrapolating object state based on updates

    - by user494461
    I have a networked multi-user collaborative application. To maintain a consistent virtual world, I send updates for objects from a master peer to a guest peer. The update state contains x,y,z coordinates of object center and his rotation matrix(CHAI3d api used a 3x3 matrix) with 30Hz frequency. I want to reduce this update rate and want to send with a reduced update rate. I want a predictor on both peers. When the predicted value is outside, say a error value of 10% in comparison to master peers objects original state the master peer triggers a state update. Now for position I used velocity,position updates so that the guest peer can extrapolate position. Like velocity for position what parameter should I use for rotation extrapolition?

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  • Unity Bar auto-hide behaviour and application icons placement

    - by Andrei
    The first issue: It seems that sometimes when I hover to the left edge of the screen the Unity Bar will not stay on top of other windows even if I continue to hover the cursor above it, at other times it will stay on top. Is this a normal behaviour? Or am I affected by some bug / inconsistency? If it's normal, what's the logic behind it? The second issue: Application icons for running applications do not maintain their position in the Unity Bar but instead move around according to some weird rules (if any?) that I can't understand. Is this to be expected, or is it a bug? Is there a way to force them to stop moving around? I like to see certain apps in certain positions and this bothers me.

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  • A Method for Reducing Contention and Overhead in Worker Queues for Multithreaded Java Applications

    - by Janice J. Heiss
    A java.net article, rich in practical resources, by IBM India Labs’ Sathiskumar Palaniappan, Kavitha Varadarajan, and Jayashree Viswanathan, explores the challenge of writing code in a way that that effectively makes use of the resources of modern multicore processors and multiprocessor servers.As the article states: “Many server applications, such as Web servers, application servers, database servers, file servers, and mail servers, maintain worker queues and thread pools to handle large numbers of short tasks that arrive from remote sources. In general, a ‘worker queue’ holds all the short tasks that need to be executed, and the threads in the thread pool retrieve the tasks from the worker queue and complete the tasks. Since multiple threads act on the worker queue, adding tasks to and deleting tasks from the worker queue needs to be synchronized, which introduces contention in the worker queue.” The article goes on to explain ways that developers can reduce contention by maintaining one queue per thread. It also demonstrates a work-stealing technique that helps in effectively utilizing the CPU in multicore systems. Read the rest of the article here.

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  • Vermont IT Jobs: Burlington based Microsoft Gold Partner looking for .NET Devs

    Software Engineers Competitive Computing, aka C2, is seeking Software Engineers to design, architect, and maintain .NET applications to support our clients eCommerce business requirements. The successful candidates will create high-quality ASP.NET web and eCommerce sites using web-based tools and techniques. Experience with languages including C#, VB.NET, ASP.NET, and JavaScript are a must. The ideal candidate will have a thorough understanding of internet and database architecture, and a high...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Architecting multi-model multi-DB ASP.NET MVC solution

    - by A. Murray
    I have an ASP.NET MVC 4 solution that I'm putting together, leveraging IoC and the repository pattern using Entity Framework 5. I have a new requirement to be able to pull data from a second database (from another internal application) which I don't have control over. There is no API available unfortunately for the second application and the general pattern at my place of work is to go direct to the database. I want to maintain a consistent approach to modeling the domain and use entity framework to pull the data out, so thus far I have used Entity Framework's database first approach to generate a domain model and database context over the top of this. However, I've become a little stuck on how to include the second domain model in the application. I have a generic repository which I've now moved out to a common DataAccess project, but short of creating two distinct wrappers for the generic repository (so each can identify with a specific database context), I'm struggling to see how I can elegantly include multiple models?

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  • Custom Themes Introduced in Gmail

    - by Rekha
    As we all know, Google Team introduced a number of HD themes last November. Now they are giving us an option of customizing our own background. We can put in our own images, select from our Google+ photos or just paste any image URL. Or we can browse the Featured Photos section to find the image that we like. They are introducing custom themes with two options, Light and Dark. In the Featured tab, we can simply search for specific kind of pictures like “hdr scenery” or “bokeh wallpaper” and so on. We can easily maintain our personal or work accounts with different background images that suites the best. The company announced this information in their blog today.

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  • Best C# database communication technique

    - by user65439
    A few days ago I read a reply to a question where people said that the days of writing queries within your c# code are long gone. I'm not sure what the specific person meant with the comment but it got me thinking. At the company I'm currently working at we maintain an assembly containing all the queries to the database (let's call it Queries), this assembly is reference by a QueryService (Retrieve the correct queries) assembly which in turn is referenced by a UnitOfWork assembly (The database connector classes, we have different connector classes for SQL, MySQL etc.). We use these three assemblies to perform operations on our database and all queries/commands are written in our C# code. Is there a better way to communicate with the database and is there a better way to communicate with different database types?

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  • What should be the minimal design/scope documentation before development begins?

    - by Oliver Hyde
    I am a junior developer working on my own in the programming aspect of projects. I am given a png file with 5-6 of the pages designed, most times in specific detail. From this I'm asked to develop the back end system needed to maintain the website, usually a cataloging system with products, tags and categories and match the front end to the design. I find myself in a pickle because when I make decisions based on assumptions about the flow of the website, due to a lack of outlining details, I get corrected and am required to rewrite the code to suit what was actually desired. This process happens multiple times throughout a project, often times on the same detail, until it's finally finished, with broken windows all through it. I understand that projects have scope creep, and can appreciate that I need to plan for this, but I feel that in this situation, I'm not receiving enough outlining details to effectively plan for the project, resulting in broken code and a stressed mind. What should be the minimal design/scope documentation I receive before I begin development?

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