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  • Multitenant Design for SQL Azure: White Paper Available

    - by Herve Roggero
    Cloud computing is about scaling out all your application tiers, from web application to the database layer. In fact, the whole promise of Azure is to pay for just what you need. You need more IIS servers? No problemo... just spin another web server. You expect to double your storage needs for Azure Tables? No problemo; you are covered there too... just pay for your storage needs. But what about the database tier, SQL Azure? How do you add new databases easily, and transparently, so that your application simply uses more of SQL Azure if its needs to? Without changing a single line of code? And what if you need to scale back down? Welcome to the world of database scalability. There are many terms that describe database scalability, including data federation, multitenant designs, and even NoSQL depending on the technical solution you are implementing.  Because SQL Azure is a transactional database system, NoSQL is not really an option. However data federation and multitenant designs offer some very interesting scalability options that are worth considering. Data federation, a feature of SQL Azure that will be offered in the future, offers very interesting capabilities available natively on the SQL Azure platform. More to come in a few weeks... Multitenant designs on the other hand are design practices and technologies designed to help you reach flexible scalability options not available otherwise. The first incarnation of such a method was made available on CodePlex as an open source project (http://enzosqlshard.codeplex.com).  This project was an attempt to provide a sharding library for educational purposes.  All that sounds really cool... and really esoteric... almost a form of database "voodoo"... However after being on multiple Azure projects I am starting to see a real need. Customers want to be able to free themselves from the database tier, so that if they have 10 new customers tomorrow, all they need to do is add 2 more SQL Azure instances. It's that simple. How you achieve this, and suggested application design guidelines, are available in a white paper I just published.  The white paper offers two primary sections. The first section describes the business and technical problem at hand, and how to classify it according to specific design patterns. For example, I discuss compressed shards through schema separation. The second section offers a method for addressing the needs of a multitenant design using a new library, the big bother of the codeplex project mentioned previously (that I created earlier this year), complete with management interface and such. A Beta of this platform will be made available within weeks; as soon as the documentation will be ready.   I would like to ask you to drop me a quick email at [email protected] if you are going to download the white paper. It's not required, but it would help me get in touch with you for feedback.  You can download this white paper here:   http://www.bluesyntax.net/files/EnzoFramework.pdf . Thank you, and I am looking for feedback, thoughts and implementation opportunities.

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  • how to design a database for a specific website.

    - by Steven Spielberg
    i want to design a Database for a website. how i can design it better. are you know any particular thing, tips , technique to design it in better way. in a table of information user can allow to website to show it or hide it. how can i do this like info1 = show info2 = show info3 = show i have a much more field that user can be showed and hide. how i can handle this situation or condition in Database

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  • How to start recognizing design patterns as you are programming?

    - by Jon Erickson
    I have general academic knowledge of the various design patterns that are discussed in GoF and Head First Design Patterns, but I have a difficult time applying them to the code that I am writing. A goal for me this year is to be able to recognize design patterns that are emerging from the code that I write. Obviously this comes with experience (I have about 2 years in the field), but my question is how can I jumpstart my ability to recognize design patterns as I am coding, maybe a suggestion as to what patterns are easiest to start applying in client-server applications (in my case mainly c# webforms with ms sql db's, but this could definitely be language agnostic).

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  • When are you truly forced to use UUID as part of the design?

    - by Pyrolistical
    I don't really see the point of UUID. I know the probability of a collision is effectively nil, but effectively nil is not even close to impossible. Can somebody give an example where you have no choice but to use UUID? From all the uses I've seen, I can see an alternative design without UUID. Sure the design might be slightly more complicated, but at least it doesn't have a non-zero probability of failure. UUID smells like global variables to me. There are many ways global variables make for simpler design, but its just lazy design.

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  • DB Interface Design Optimization: Is it better to optimise for Fewer requests of smaller data size?

    - by Overflow
    The prevailing wisdom in webservices/web requests in general is to design your api such that you use as few requests as possible, and that each request returns therefore as much data as is needed In database design, the accepted wisdom is to design your queries to minimise size over the network, as opposed to minimizing the number of queries. They are both remote calls, so what gives?

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  • Programatically detect number of physical processors/cores or if hyper-threading is active on Window

    - by HTASSCPP
    I have a multithreaded c++ application that runs on Windows, Mac and a few Linux flavours. To make a long story short: Inorder for it to run at maximum efficiency I have to be able to instantiate a single thread per physical processor/core. Creating more threads than there are physical processors/cores degrades the performance of my program considerably. I can already correctly detect the number of logical processors/cores correctly on all three of these platforms. To be able to detect the number of physical processors/cores correctly I'll have to detect if hyper-treading is supported AND active. My question therefore is if there is a way to detect whether hyperthreading is supported AND ENABLED? If so, how exactly.

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  • Not enough physical memory available to run Virtual Machine

    - by unknown (google)
    hi I when i am trying to run virtual machine on VMW 6.5 it shows me following error. "Not enough physical memory is available to power on this virtual machine with its configured settings. To fix this problem, adjust the additional memory settings to allow more virtual machine memory to be swapped. If you were able to power on this virtual machine on this host computer in the past, try rebooting the host computer. Rebooting may allow you to use slightly more host memory to run virtual machines." i have also tried options that are suggested from above error, but still its not working. Can you help me to solve this problem? Thanks

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  • How can I: Convert Physical to VM, the machine it's running on

    - by Daisetsu
    I have virtualized laptops before, when someone gets a new one and doesn't want to quite let go of their old laptop for fear of losing something. This was using VMWare Workstation 7.X. In 8.0 when I go to "Convert a Physical Machine to a Virtual Machine", it asks for an IP address and doesn't give the option to virtualize the machine it's running on. How to I get VMWare to virtualize it's current system? I tried typing in Localhost, and 127.0.0.1 but that didn't do it.

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  • design of 'game engine' for small javascript games?

    - by Matt Ball
    I'm making a group of two or three simple javascript games for fun. After someone finishes one game, they'll be presented with a harder or easier version of another game depending on whether the original game was won or lost. I have a high-level question about the design of things: So far I've created a class for one game type that manages the interaction with the UI and the state of the game itself. But for tracking how many of the subgames have been won, or for understanding whether the next game presented should be more or less difficult, are there arguments to be made for making a 'game engine' class? How does the engine communicate to the games? For instance, when a game is won, how is that information relayed to the engine? Is there a better or more common design? (If you want to see what I have so far, the games are slowly taking shape here: https://github.com/yosemitebandit/candela and can be viewed at http://yosemitebandit.com/candela)

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  • Hyper-V performance comparisons vs physical client?

    - by rwmnau
    Are there any comparisons between Hyper-V client machines and their physical equivalent? I've looked around and can find 4000 articles about improving Hyper-V performance, but I can't find any that actually do a side-by-side comparison or give benchmarking numbers. Ideally, I'm interested in a comparison of CPU, memory, disk, and graphics performance between something like the following: Some powerful workstation (with plenty of RAM) with Windows 7 installed on it directly Same exact worksation with Hyper-V Server 2008 R2 (the bare Server role) and a full-screen Windows 7 client machine Virtual Server 2005 had performance that didn't compare at all with actual hardware, but with the advances in CPU and hardware-level virtualization, has performance improved significantly? How obvious would it be to a user of the two above scenarios that one of them was virtualized, and does anybody know of actual benchmarking of this type?

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  • Book Review: Professional ASP.NET Design Patterns by Scott Millett

    - by Sam Abraham
    In the next few lines, I will be providing a brief review of Wrox’s Professional ASP.NET Design Patterns by Scott Millett. Design patterns have been a hot topic for many years as developers looked to do more with less, re-use as much code as possible by creating common libraries, as well as make their code easier to understand, extend and collaborate on. Scott Millett’s book covered classic and emerging patterns in a practical presentation that demonstrated with thorough examples how to put each pattern to use in the context of multi-tiered ASP.NET applications. The author’s unique approach and content earned him much kudos in the foreword by Scott Hanselman as well as online reviews. The book has 14 chapters of which 5 are dedicated to a comprehensive case study. Patterns covered therein include S.O.L.I.D, Gang of Four (GoF) as well as Martin Fowler’s Patterns of Enterprise Applications. Many thanks to the Wiley/Wrox User Group Program for their support of our West Palm Beach Developers’ Group. Best regards, --Sam You can access my reviews of books I recently read: Professional WCF 4.0 Inside Windows Communication Foundation Inside Microsoft SQL Server 2008 series

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  • Windows XP-Physical memory dumping

    - by Raghav Bali
    I have windows XP professional installed on my desktop. It shows up the following errors - Physical memory dumping blue screen. : This aint a new problem, i have been facing this problem ever since i bought this systme. initially the maintainence guy said it was a faulty hard drive and i have got it replaced 3 times already in the past 1 yr. The system gets utterly slow after a usage of around 2-3 months and then these errors crop up and i have to reinstall my windows to keep away these errors. But this time,its been only a week and the blue screen has come up 3 times. What can be the actual cause of the error?? Mine is an assembled machine, its a core 2duo with gigabyte motherboard and a 1 gb ram, 160 gb seagate hdd. please help me its a seriously annoying problem. Edit : A new error recent popprd up, what should i do now??

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  • Run a BitLocker protected Windows 7 installation on VirtualBox from physical drive

    - by djechelon
    I have a broken laptop with its hard drive intact. I'll be getting it repaired in a few days but I must continue my work possibly uninterrupted, so I chose to run the OS in another working laptop (I can't just transfer documents). My question is really simple: Can I create a virtual machine in VirtualBox (under Linux) that uses the physical hard drive mentioned above which is encrypted with BitLocker? I have the restore key at hand, of course. I wouldn't like to mount the hard disk as primary hard disk for laptop (and run 7 as primary OS), but that could be the final choice if virtualizing is not an option. Thank you.

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  • Mapping of memory addresses to physical modules in Windows XP

    - by Josef Grahn
    I plan to run 32-bit Windows XP on a workstation with dual processors, based on Intel's Nehalem microarchitecture, and triple channel RAM. Even though XP is limited to 4 GB of RAM, my understanding is that it will function with more than 4 GB installed, but will only expose 4 GB (or slightly less). My question is: Assuming that 6 GB of RAM is installed in six 1 GB modules, which physical 4 GB will Windows actually map into its address space? In particular: Will it use all six 1 GB modules, taking advantage of all memory channels? (My guess is yes, and that the mapping to individual modules within a group happens in hardware.) Will it map 2 GB of address space to each of the two NUMA nodes (as each processor has it's own memory interface), or will one processor get fast access to 3 GB of RAM, while the other only has 1 GB? Thanks!

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  • Google I/O 2010 - Android UI design patterns

    Google I/O 2010 - Android UI design patterns Google I/O 2010 - Android UI design patterns Android 201 Chris Nesladek, German Bauer, Richard Fulcher, Christian Robertson, Jim Palmer In this session, the Android User Experience team will show the types of patterns you can use to build a great Android application. We'll cover things like how to use Interactive Titlebars, Quick Contacts, and Bottom bars as well some new patterns which will get an I/O-only preview. The team will be also available for a no holds barred Q&A session. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 6 0 ratings Time: 58:42 More in Science & Technology

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  • La première beta de Ubuntu 10.04 LTS est sortie : nouveau design, nouveau kernel, nouveaux logiciels

    La beta 1 de Ubuntu 10.04 LTS est sortie Nouveau design, nouveau kernel, nouveaux logiciels Fini le marron dans Ubuntu. Le choc est rude, certes. Mais la première beta de la mouture 10.04 de l'OS consolera les nostalgique de l'ancien design de la distribution Linux (certainement) la plus connue au monde. Bien qu'il ne s'agisse que de la première beta, Lucid Lynx propose en effet déjà plusieurs nouveautés majeures. Sous le capot, on trouve par exemple le kernel 2.6.32 de Linux, Gnome 2.30 et une prise en charge améliorée des cartes graphiques NVIDIA. Coté logiciel, Ubuntu 10.04 propose notamment OpenOffice.org 3.2.0 (la suite bureautique de Su...

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  • Photoshop Elements 9 VS Paintshop Photo Pro X3 For Web Design

    - by Brian
    I need a good image creation program for web design. I have downloaded both Elements 9 and Paintshop X3. So far I have found them both to be great programs. X3 seems like it has a lot of features, Elements seems like it's quite easy and stable to use. I think I'm going to go with Elements, but I wanted to get other opinions. Which program do you guys like better overall? What things do you think they lack for image creation/editing pertaining to web design, or what features do they have that are great for it? Thanks!

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  • Using VMWare Workstation, to convert a physical Win2008 into a templtae

    - by SndLt
    I'm new to VMware and despite having read the documentations, I'm having trouble. I'm using VMware workstation Stand-Alone package to turn a physical Win Server 2008 R2 into a usable VM appliance. The source and destination part is getting me here. It seems using keyword "localhost" doesn't cut all the way through. Does the shared folder have to be in my local drive for that matter? For ip, am I using the simple private IP that my nearest DHCP has given me? But what if I have more than one interfaces that have two or three different private ip addresses? Thanks.

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  • Linux PCIE Physical Bus Address

    - by Without me Its just Aweso
    I am working on designing a custom PCIexpress card. I am trying to write a kernel module that will DMA my custom card. Right now when i plug the card into linux no valid PCI device shows up (meaning I probably have a error on my end, i know) however, If I halt the system at startup in the bootloader (uboot) I am able to directly access the card as I know in uboot the physical memory address that is mapped to my device. Is there a way I can access the card in a simliar fashion in linux? Thanks, Stephanie

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