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  • Bringing in New Architecture During Maintenance on Legacy Systems

    - by Mike L.
    I have been tasked with adding some new features to a legacy ASP.NET MVC2 project. The codebase is a disaster and I want to write these new features with some thought behind the implementation and not just throw these new features into the mess. I would like to introduce things like dependency injection and the orchestrator pattern; just to the code that I am going to write. I don't have enough time to try to refactor the entire system. Is it OK to not be consistent with the rest of the codebase and add new features following different design principles? Should I not introduce new patterns and just get the features implemented? I feel like it might be confusing to the next person to see parts of the system using a design that other parts are not following.

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  • #OOW 2012 : IaaS, Private Cloud, Multitenant Database, and X3H2M2

    - by Eric Bezille
    The title of this post is a summary of the 4 announcements made by Larry Ellison today, during the opening session of Oracle Open World 2012... To know what's behind X3H2M2, you will have to wait a little, as I will go in order, beginning with the IaaS - Infrastructure as a Service - announcement. Oracle IaaS goes Public... and Private... Starting in 2004 with Fusion development, Oracle Cloud was launch last year to provide not only SaaS Application, based on standard development, but also the underlying PaaS, required to build the specifics, and required interconnections between applications, in and outside of the Cloud. Still, to cover the end-to-end Cloud  Services spectrum, we had to provide an Infrastructure as a Service, leveraging our Servers, Storage, OS, and Virtualization Technologies, all "Engineered Together". This Cloud Infrastructure, was already available for our customers to build rapidly their own Private Cloud either on SPARC/Solaris or x86/Linux... The second announcement made today bring that proposition a big step further : for cautious customers (like Banks, or sensible industries) who would like to benefits from the Cloud value of "as a Service", but don't want their Data out in the Cloud... We propose to them to operate the same systems, Exadata, Exalogic & SuperCluster, that are providing our Public Cloud Infrastructure, behind their firewall, in a Private Cloud model. Oracle 12c Multitenant Database This is also a major announcement made today, on what's coming with Oracle Database 12c : the ability to consolidate multiple databases with no extra additional  cost especially in terms of memory needed on the server node, which is often THE consolidation limiting factor. The principle could be compare to Solaris Zones, where, you will have a Database Container, who is "owning" the memory and Database background processes, and "Pluggable" Database in this Database Container. This particular feature is a strong compelling event to evaluate rapidly Oracle Database 12c once it will be available, as this is major step forward into true Database consolidation with Multitenancy on a shared (optimized) infrastructure. X3H2M2, enabling the new Exadata X3 in-Memory Database Here we are :  X3H2M2 stands for X3 (the new version of Exadata announced also today) Heuristic Hierarchical Mass Memory, providing the capability to keep most if not all the Data in the memory cache hierarchy. Of course, this is the major software enhancement of the new X3 Exadata machine, but as this is a software, our current customers would be able to benefit from it on their existing systems by upgrading to the new release. But that' not the only thing that we did with X3, at the same time we have upgraded everything : the CPUs, adding more cores per server node (16 vs. 12, with the arrival of Intel E5 / Sandy Bridge), the memory with 512GB memory as well per node,  and the new Flash Fire card, bringing now up to 22 TB of Flash cache. All of this 4TB of RAM + 22TB of Flash being use cleverly not only for read but also for write by the X3H2M2 algorithm... making a very big difference compare to traditional storage flash extension. But what does those extra performances brings to you on an already very efficient system: double your performances compare to the fastest storage array on the market today (including flash) and divide you storage price x10 at the same time... Something to consider closely this days... Especially that we also announced the availability of a new Exadata X3-2 8th rack : a good starting point. As you have seen a major opening for this year again with true innovation. But that was not the only thing that we saw today, as before Larry's talk, Fujitsu did introduce more in deep the up coming new SPARC processor, that they are co-developing with us. And as such Andrew Mendelsohn - Senior Vice President Database Server Technologies came on stage to explain that the next step after I/O optimization for Database with Exadata, was to accelerate the Database at execution level by bringing functions in the SPARC processor silicium. All in all, to process more and more Data... The big theme of the day... and of the Oracle User Groups Conferences that were also happening today and where I had the opportunity to attend some interesting sessions on practical use cases of Big Data one in Finances and Fraud profiling and the other one on practical deployment of Oracle Exalytics for Data Analytics. In conclusion, one picture to try to size Oracle Open World ... and you can understand why, with such a rich content... and this only the first day !

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  • Entity Framework: Connecting to a mdf user database file via localDB during script execution

    - by Marko Apfel
    Problem If you run the “Generate database from model” wizard and execute the generated script the destination database could be the wrong one (for instance master of the SQL Server). Solution To use an own mdf attachable user database some connection information must specified during script execution. Execute your script opens the dialog “Connect to Server”. Press “Options” and go to the second tab “Connection Properties”. Select “Browse server” in the “Connect to database” dropdown box: Confirm the information dialog with “Yes”. In the following dialog you could choose your user database. Now the schema is created in the user database.

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  • Writing a Master's Thesis on evaluating visual scripting systems

    - by user1107412
    I am thinking to write my Master's thesis around theorizing, and then implementing a PlayMaker or Kismet-like (building game logic by visually arranging FSMs) tool in Unity. The only thing I am still concerned about is the actual research question that I should pose. I was kinda hoping that the more experienced game designers out there might know. Update: What about reducing the use of visual programming to graphically designing FSM-Action-Transition flows, which can then be attached to game entities (very much like http://playmaker.com does it)?

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  • .NET Dependency Management Systems

    - by StriplingWarrior
    I have some .NET projects that are starting to get large enough to merit looking into Dependency Management solutions, so we don't have to copy binaries from one project to another. Here's what I've found so far: NPanday is based on a port of Maven. I can't tell how recently it was worked on, but the last release was in May 2011. NuGet seems to be under active development, and it appears to have support directly from Microsoft. Some people complained that it "only addresses dependency resolution," but I don't know what else it should address, or whether it has added more features since that point. It does appear to have recently added the ability to import binaries as part of the build process so we don't have to commit them to our repositories. Refix appears to still be in Beta, after having received no attention since Sept 2011. Would somebody with recent experience using any of these dependency management tools (or any others that work well) share your experience? Is NuGet mature enough to use it for dependency management? If not, what does it lack?

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  • DDD / Layers and legacy systems

    - by CSM
    I have to refactor a complex C# app (many dialogs, mixed logic and so on). There is a part managing the communication with special hardware equipments (sending commands and receive data via asynchronous c# callbacks). The code is "spaghetti" with mixed UI/Logic/Communication/etc and my task is to split the layers in a DDD sense. So, to which layer belongs a callback driver routine? The callbacks are creating "bubbles" in the system, up to the UI layer and because of this I cannot enforce the essential principle that any element of a layer depends only on other elements in the same layer or on elements of the layers "beneath" it. Thank you in advance.

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  • Ubuntu/Windows XP - Joint systems

    - by Brian Buck
    I have a computer sectioned to run both Ubuntu 10.10 and Windows XP but as XP refuses to log in (If I select XP the log in starts with the Windows logo being shown on the screen for a few seconds before the screen goes blank and the page showing the option of selecting Windows or Ubuntu the re-appears), I would like to clear it completely from the system and just run Ubuntu. Can this be done, and if so, how do I proceed with doing it?

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  • MySQL maintenance - how to clear the buffer?

    - by Dougal
    We have a server running our web app (PHP / MySQL) which is SLOW. My predecessor says that: "We use to do database maintenance, which use to clear the buffer, cached and unwanted variables." And I wonder what on earth he means with that statement? Does he mean a simple optimize of the tables? Or the query cache? I understand MySQL but don't really know what he is describing. I would appreciate any pointers. Thanks.

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  • interview for an embedded systems C developer profile

    - by Registered User
    Following are interview questions 1) code for kernel scheduler ( I could not, he said even if some portion of code then fine I have read but reproducing them I could not do that ) 2) asked to write code for Interrupt handlers (I am aware but could not reproduce code ) 3)Device drivers file operations (this I was able to write) 4) Asked to explain Xen bootstrapping and architecture code (not diagrams) I am looking for links where code has been explained.I have read such things but I some times feel difficult to understand without having a proper explanation. So in case you are aware of any such things let me know.

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  • CTERA Adds Data Protection to Linux File Systems

    <b>Enterprise Storage Forum: </b>"CTERA Networks is giving the Linux Ext3 file system additional data protection in the form of new snapshot capabilities. The file system is also the basis of the company's Cloud-Attached Storage appliances, the C200 and CloudPlug."

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  • Designing extensible, interactive systems

    - by vemv
    Steve Yegge's The Pinoccio Problem describes a very special type of program: one that not only fulfills the original purpose of its creators, but also is capable of performing arbitrary, user-defined computations. They typically also host a console, by which one can reprogram the software on runtime, maybe persisting the modifications. I find this problem very hard to reason about - there seems to be a conflict between implementing the 'core modules' of a program, and making the system really implementation-agnostic (i.e. no functionality is hard-coded). So, how to architecture such a program - what techniques can help? Is it a well-studied topic?

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  • Which database to use for quickly and pygtk

    - by usher
    I'm writing application using quickly Pygtk and glade. this application should have database connection (such as MySQL) for reading and writing data from the local or outsourcing machine \ server. However, in my machine there is MySQL installed, but when releasing the app it sould be installed on another ubuntu machine, which may not have mysql and moreover not the same database with the required database name and structure.... So my questions are: Is it a good choice using mysql as database 1.2 If not what is? Is it posible to embeding mysql or other database program during the installation from ubuntu software center? 2.2 If it's posible: hwo(any tutorial?) Where to store secure data outside the mysql (or whatever) for conecting the database every time a user launch the application

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  • Oracle Engineered Systems, Amazing Exalogic

    - by AVargas
    Sometimes I have heard that Exalogic is just a bunch of servers connected using infiniband, something that you can easily build yourself at a lower cost. That comments misses completely 2 things: 1) What is the idea behind an Oracle engineered system, and the back that Oracle provides for them  2) What is Exalogic This amazing 5 minute presentation explains Exalogic potential: Oracle Exalogic Elastic Cloud

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  • Designing a user-defined list to be stored in a relational database - Should I include user index?

    - by Zaemz
    By index, I mean, as the user creates the list, each item receives an integer index for its place in that particular list. Since there will be a table of ListItems, I'd prefer to avoid using the name "Index" for the field. Then I was thinking - should I even include the list index in the database? I figured I would because the list would be created in the same fashion every time, then. Or I could order the list for the user based on its actual primary key, since the list items are created in succession anyway... What should I do?

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  • New technical whitepaper on Database-as-a-Service

    - by Javier Puerta
    High Availability Best Practices for Database Consolidation- The Foundation for Database-as-a-Service. An Oracle White Paper - April 2014 This paper provides MAA best practices for Database Consolidation using Oracle Multitenant. It describes standard HA architectures that are the foundation for DBaaS. It is most appropriate for a technical audience: Architects, Directors of IT and Database Administrators responsible for the consolidation and migration of traditional database deployments to DBaaS.  Recommended best practices are equally relevant to any platform supported by Oracle Database except where explicitly noted as being an optimization or an example that applies only to Oracle Engineered systems

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  • ZaReason Ships Ubuntu 10.04 Systems

    <b>WorksWithU:</b> "Each time Canonical ships a new Ubuntu release, I'm inclined to reach out to two specific PC companies: ZaReason and System76. Both companies focus intensely on Ubuntu netbooks, notebooks, PCs and servers."

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  • Share USB devices between 32 bit and 64 bit systems

    - by Sreejith S
    The latest version of USBDeviceShare, the USB over IP software, supports sharing USB devices between 32 bit and 64 bit editions of Windows. A USB device plugged in to a 64 bit PC running 64 bit version of Windows can be shared and remotely accessed from a 32 bit PC and vice versa. Download USBDeviceShare USB over Network software from http://www.sysnucleus.com/usbshare/usbshare_download.html Keywords : USB over Ethernet, USB Server, Remote USB Access, Share USB

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  • Leveraging Existing ERP Systems to Support Environmental Accounting and Reporting

    Organizations globally are faced with a complex set of emissions reporting requirements. Driven by country-specific regulatory mandates as well as stakeholder requests for voluntary reporting, companies are under pressure to provide consistent, transparent and accurate collection, measurement and reporting of energy usage and emissions data. In this podcast, you'll year about how the new Oracle Environmental Accounting and Reporting solution extends the capabilities of Oracle E-Business Suite and JD Edwards Financials to enable organizations to track their greenhouse gas emissions and other environmental data against reduction targets, and to obtain accurate, repeatable and verifiable methodologies for greenhouse gas calculation in accordance with global standards and for both voluntary and legislated emissions reporting schemes.

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  • Testing my model for hybrid scheduling in Embedded Systems

    - by markusian
    I am working on a project for school, where I have to analyze the performances of a few fixed-priority servers algorithms (polling server, deferrable server, priority exchange) using a simulator in the case of hybrid scheduling, where we have both hard periodic tasks and soft aperiodic tasks. In my model I consider that: the hard tasks have a period equal to their deadline, with a known worst case execution time (wcet). The actual execution time could be smaller than the wcet. the soft tasks have a known wcet and random interarrival times. The actual execution time could be smaller than the wcet. In order to test those algorithms I need realistic case studies. For this reason I'm digging in the scientific literature but I am facing different problems: Sometimes I find a list of hard tasks with wcet, but it is not specified how the soft tasks parameters are found. Given the wcet of a task, how can I model its actual execution time? This means, what random distribution should I use considering the wcet? How can I model the random interarrival times of soft aperiodic tasks?

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  • What are some ways people deploy relational database changes using Node.js? [closed]

    - by JamesEggers
    I've been diving more and more into Node.js and hosting services like Heroku and Nodejitsu recently and have been trying to figure out how to best deploy database changes for postgres or mysql. There are a few migration projects under npm that I can see; however, all seem to be really buggy or just not work. I currently manage the Monarch migration project on npm, but it's currently buggy itself and my experiences developing such utilities are in other, more procedural, languages. So what do people use to deploy changes to their databases on these environments? What has worked for people? I'm looking for a better understanding of what the current situation/process looks like.

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  • Is it safe to set MySQL isolation to "Read Uncommitted" (dirty reads) for typical Web usage? Even with replication?

    - by Continuation
    I'm working on a website with typical CRUD web usage pattern: similar to blogs or forums where users create/update contents and other users read the content. Seems like it's OK to set the database's isolation level to "Read Uncommitted" (dirty reads) in this case. My understanding of the general drawback of "Read Uncommitted" is that a reader may read uncommitted data that will later be rollbacked. In a CRUD blog/forum usage pattern, will there ever be any rollback? And even if there is, is there any major problem with reading uncommitted data? Right now I'm not using any replication, but in the future if I want to use replication (row-based, not statement-based) will a "Read Uncommitted" isolation level prevent me from doing so? What do you think? Has anyone tried using "Read Uncommitted" on their RDBMS?

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