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  • Don’t learn SSDT, learn about your databases instead

    - by jamiet
    Last Thursday I presented my session “Introduction to SSDT” at the SQL Supper event held at the offices of 7 Digital (loved the samosas, guys). I did my usual spiel, tour of the IDE, connected development, declarative database development yadda yadda yadda… and at the end asked if there were any questions. One gentleman in attendance (sorry, can’t remember your name) raised his hand and stated that by attempting to evangelise all of the features I’d missed the single biggest benefit of SSDT, that it can tell you stuff about database that you didn’t already know. I realised that he was dead right. SSDT allows you to import your whole database schema into a new project and it will instantly give you a list of errors and/or warnings pertaining to the objects in your database. Invalid references (e.g a long-forgotten stored procedure that refers to a non-existent column), unnecessary 3-part naming, incorrect case usage, syntax errors…it’ll tell you about all of ‘em! Turn on static code analysis (this article shows you how) and you’ll learn even more such as any stored procedures that begin with “sp_”, WHERE clauses that will kill performance, use of @@IDENTITY instead of SCOPE_IDENTITY(), use of deprecated syntax, implicit casts etc…. the list goes on and on. I urge you to download and install SSDT (takes a few minutes, its free and you don’t need SQL Server or Visual Studio pre-installed), start a new project: right-click on your new project and import from your database: and see what happens: You may be surprised what you discover. Let me know in the comments below what results you get, total number of objects, number of errors/warnings, I’d be interested to know! @Jamiet

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  • Windows and SQL Azure Best Practices: Affinity Groups

    - by BuckWoody
    When you create a Windows Azure application, you’ll pick a subscription to put it under. This is a billing container - underneath that, you’ll deploy a Hosted Service. That holds the Web and Worker Roles that you’ll deploy for your applications. along side that, you use the Storage Account to create storage for the application. (In some cases, you might choose to use only storage or Roles - the info here applies anyway) As you are setting up your environment, you’re asked to pick a “region” where your application will run. If you choose a Region, you’ll be asked where to put the Roles. You’re given choices like Asia, North America and so on. This is where the hardware that physically runs your code lives. We have lots of fault domains, power considerations and so on to keep that set of datacenters running, but keep in mind that this is where the application lives. You also get this selection for Storage Accounts. When you make new storage, it’s a best practice to put it where your computing is. This makes the shortest path from the code to the data, and then back out to the user. One of the selections for the location is “Anywhere U.S.”. This selection might be interpreted to mean that we will bias towards keeping the data and the code together, but that may not be the case. There is a specific abstraction we created for just that purpose: Affinity Groups. An Affinity Group is simply a name you can use to tie together resources. You can do this in two places - when you’re creating the Hosted Service (shown above) and on it’s own tree item on the left, called “Affinity Groups”. When you select either of those actions, You’re presented with a dialog box that allows you to specify a name, and then the Region that  names ties the resources to. Now you can select that Affinity Group just as if it were a Region, and your code and data will stay together. That helps with keeping the performance high. Official Documentation: http://msdn.microsoft.com/en-us/library/windowsazure/hh531560.aspx

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  • An XEvent a Day (14 of 31) – A Closer Look at Predicates

    - by Jonathan Kehayias
    When working with SQL Trace, one of my biggest frustrations has been the limitations that exist in filtering.  Using sp_trace_setfilter to establish the filter criteria is a non-trivial task, and it falls short of being able to deliver complex filtering that is sometimes needed to simplify analysis.  Filtering of trace data was performed globally and applied to the trace affecting all of the events being collected.  Extended Events introduces a much better system of filtering using...(read more)

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  • Dynamic Regions

    - by raghu.yadav
    In this blog you can see simple usecase to display employees, departments tables using dynamic region component. However first bunch of thanks to andre blogging examples related to dynamic regions and you can find more related examples in andre blog andre-examples. Here is the simple dynamic region sample screen shots. Here is the impl steps. dep.jsff with dep table in it emp.jsff with emp table in it dep.xml ( dep taskflow ) emp.xml ( emp taskflow ) main.jspx ( with pannelsplitter first component having 2 commandmenuItems or commandlinks (emp and dep ) with action set to there respective taskflows (emp.xml and dep.xml) and second component having dynamic region component of department taskflow (default render). DynamicRegionBacking Bean - add department and employee taskflow code as shown in screen shot. set PartialTriggers on region in main.jspx to emp and dep commandmenuitems or links. that's it.

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  • SQL Server 2012 : The Data Tools installer is now available

    - by AaronBertrand
    Last week when RC0 was released, the updated installer for "Juneau" (SQL Server Data Tools) was not available. Depending on how you tried to get it, you either ended up on a blank search page, or a page offering the CTP3 bits. Important note: the CTP3 Juneau bits are not compatible with SQL Server 2012 RC0. If you already have Visual Studio 2010 installed (meaning Standard/Pro/Premium/Ultimate), you will need to install Service Pack 1 before continuing. You can get to the installer simply by opening...(read more)

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  • Preserving Permalinks

    One of the things that gets me on a rant is websites that break permalinks. If you have posted something somewhere and there is a public URL pointing to it, that URL should never ever return a 404. You are breaking all websites that ever linked to you and you are breaking all search engine links to your content (that others will try and follow). It is a pet peeve of mine. So when I had to move my blog, obviously I would preserve the root URL (www.danielmoth.com/Blog/), but I also wanted to preserve...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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  • Allen for Umbraco with location EXIF meta data

    - by Vizioz Limited
    The latest version of Allen for Umbraco has now hit the Apple App store, we have managed to add some nice improvements to this version that include:Storing location and direction information when photos are taken within the AppEmbedding EXIF data into the images when they are uploadBackground UploadingPull to refresh the media tree Location and DirectionBy default when the camera is used within an application the location and direction that the camera is pointing is not stored within the image meta data. We have now added full support so that this data is now added. We have added a setting which allows you to prevent this data from being uploaded to your website if you do not want the location data to be sent you can turn it off within Allen, Note: Please don't forget that location services do need to be turned on to allow the app to access the images in the phone's asset library.We have had quite a few ideas from users already for using this location data, including logging free parking in Denmark to geo-tagging holiday photos and linking the photos to Google street view. Embedding EXIF dataWe now embed all the meta data available on the iPhone into the image when it is uploaded to your server, this allows you to pull the data out and use it within your site. Have a look at Cultiv's Photo Meta Data package for great example code that allows you to automatically pull this data out and populate properties on your Umbraco media item.We slightly modified the source code of this package to allow the package to always extract the image data, as the default package requires a property to allow the data to be extracted, it's an easy change, if you get stuck add a comment to this post. Background UploadingIf you try to upload multiple images and need to start doing something else on your phone, you can now click the home button and the application will continue to upload your images in the background. As soon as it has finished you will receive a standard Apple notification. Pull to RefreshOur final enhancement has been to add "Pull to refresh" to the media trees, just pull the tree downwards with your finger and it will refresh, this is useful if you are adding items to your media tree while testing your site with Allen for Umbraco. Future enhancements.. your ideas?If you have any ideas for future enhancement feel free to add a comment below!

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  • My new laptop - with a really nice battery option

    - by Rob Farley
    It was about time I got a new laptop, and so I made a phone-call to Dell to discuss my options. I decided not to get an SSD from them, because I’d rather choose one myself – the sales guy tells me that changing the HD doesn’t void my warranty, so that’s good (incidentally, I’d love to hear people’s recommendations for which SSD to get for my laptop). Unfortunately this machine only has one HD slot, but I figure that I’ll put lots of stuff onto external disks anyway. The machine I got was a Dell Studio XPS 16. It’s red (which suits my company), but also has the Intel® Core™ i7-820QM Processor, which is 4 Cores/8 Threads. Makes for a pretty Task Manager, but nothing like the one I saw at SQLBits last year (at 96 cores), or the one that my good friend James Rowland-Jones writes about here. But the reason for this post is actually something in the software that comes with the machine – you know, the stuff that most people uninstall at the earliest opportunity. I had just reinstalled the operating system, and was going through the utilities to get the drivers up-to-date, when I noticed that one of Dell applications included an option to disable battery charging. So I installed it. And sure enough, I can tell the battery not to charge now. Clearly Dell see it as a temporary option, and one that’s designed for when you’re on a plane. But for me, I most often use my laptop with the power plugged in, which means I don’t need to have my battery continually topping itself up. So I really love this option, but I feel like it could go a little further. I’d like “Not Charging” to be the default option, and let me set it when I want to charge it (which should theoretically make my battery last longer). I also intend to work out how this option works, so that I can script it and put it into my StartUp options (so it can be the Default setting). Actually – if someone has already worked this out and can tell me what it does, then please feel free to let me know. Even better would be an external switch. I had a switch on my old laptop (a Dell Latitude) for WiFi, so that I could turn that off before I turned on the computer (this laptop doesn’t give me that option – no physical switch for flight mode). I guess it just means I’ll get used to leaving the WiFi off by default, and turning it on when I want it – might save myself some battery power that way too. Soon I’ll need to take the plunge and sync my iPhone with the new laptop. I’m a little worried that I might lose something – Apple’s messages about how my stuff will be wiped and replaced with what’s on the PC doesn’t fill me with confidence, as it’s a new PC that doesn’t have stuff on it. But having a new machine is definitely a nice experience, and one that I can recommend. I’m sure when I get around to buying an SSD I’ll feel like it’s shiny and new all over again! Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • XNA Notes 011

    - by George Clingerman
    Even with a lot of the XNA community working on Dream Build Play entries ( I swear I’m going to finish mine this year!) people are still finding time to do side projects and be amazingly active in the XNA and XBLIG community. With my one eye on my code and one eye on the community, here’s what I noticed these over achievers doing this past week! Time Critical XNA News: Xbox LIVE Indie Games sales data will be delayed March 17-20th due to some schedule maintenance http://create.msdn.com/en-us/news/indie_games_data_delay_march2011 GameMarx is releasing a series of videos to help raise donations for victims of the earthquakes and tsunami in Japan. Help out if you can! http://www.gamemarx.com/video/special/29/help-japan-sushido.aspx XNA MVPs: Catalin Zima shares his thoughts on the MVP summit and my book! http://www.catalinzima.com/2011/03/mvp-summit-2011/ Glenn Wilson (@mykre) helps the XNA team announce some new educational content that you don’t want to miss if you’re porting your app or game to Windows Phone 7 http://www.virtualrealm.com.au/Blog/tabid/62/EntryId/653/Porting-your-App-or-Game-to-Windows-Phone-7.aspx and Windows Phone 7 from scratch http://www.virtualrealm.com.au/Blog/tabid/62/EntryId/654/Windows-Phone-from-Scratch.aspx and shares a link to some free architectural models and textures http://twitter.com/#!/Mykre/status/46410160784158720 George (that’s me!) shares his MVP Summit 2011 summary and XBLIG thoughts http://geekswithblogs.net/clingermangw/archive/2011/03/15/144366.aspx XNA Developers: @SmallCaveGames shares a Code of Ethics for Xbox LIVE Indie Game Developers http://smallcavegames.blogspot.com/2011/03/unofficial-xblig-developers-code-of.html Derek S adds more Xbox LIVE Indie Game studios to his master list of XBLIG links http://twitter.com/#!/Mr_Deeke/status/46140996056125440 http://xbl-indieverse.blogspot.com/p/xblig-links.html Making games and want to help kids? Then share your story with GameFace: America! http://gameitupinitiative.com/about-the-initiative/programs/gameface-america/ Xbox LIVE Indie Games (XBLIG): XonaGames shares some video footage of their booth from GDC 2011 Video 1: http://youtu.be/lxIV9nk3Gq4 Video 2: http://youtu.be/GgfrjqkxR_o Video 3: http://youtu.be/yVcpXrTX7SQ Joystiq on Mommy’s Best Games Serious Sam Double D http://www.joystiq.com/2011/03/16/the-most-important-thing-about-serious-sam-double-d/ And The Escapist recommends that gamers start learning to avoid cleavage now http://www.escapistmagazine.com/news/view/108543-Boobie-Bomber-Makes-First-Appearance-in-Serious-Sam-Double-D Magiko Gaming started a blog on the XBLIG dashboard daily Top 10 games in the US. Good way to go back in time and look at the history of which games were in the the Top 10. http://dailytop10indiegames.wordpress.com/ Where are they going now? XBLIG developers at a crossroads.. http://www.gamesetwatch.com/2011/03/where_are_they_going_now_xblig.php http://www.gamasutra.com/view/news/33527/InDepth_Where_Are_They_Going_Now_XBLIG_Developers_At_A_Crossroads_.php BinaryTweed’s Clover: A Curious Tail is Xbox LIVE’s Deal of the Week! http://www.armlessoctopus.com/2011/03/15/what-luck-clover-a-curious-tale-is-half-price-this-week/ Looking for an Xbox LIVE Indie Game to buy? Writings of Mass Deduction has over 125 suggestions at this point! http://writingsofmassdeduction.com/ SkaStudios shares Vampire Smile Achievements AND their PAX East 2011 Both Setup video http://www.ska-studios.com/2011/03/14/vampire-smile-achievement/ http://www.ska-studios.com/2011/03/15/pax-booth-setup-time-lapse/ MasterBlud and VVGTV starts a new community for XBLIG developers and gamers to join http://vvgtv.forumotion.com/ Raymond Matthews (@DrakstarMatryx) covers Mommy’s Best Games getting Serious http://www.darkstarmatryx.com/?p=286 XNA Development: Dave Henry (@mort8088) posts the 4th tutorial in his series XNA 4.0 SpriteBatch extended http://mort8088.com/2011/03/11/xna-4-0-tutorial-4-spritebatch-extended/ Tutorial 5 - Creating a manual blank texture http://mort8088.com/2011/03/13/xna-4-tutorial-5-manual-blank-texture/ XNA 4.0 Tutorial 6 - Spritesheet Object http://mort8088.com/2011/03/18/xna-4-0-tutorial-6-spritesheet-object/ Jason Mitchell shares a tutorial on setting the alpha value for spritebatch in XNA 4.0 http://www.jason-mitchell.com/index.php/2011/03/13/setting-alpha-value-for-spritebatch-draw-in-xna-4/ XNA for Silverlight Developers: Part 7 - Collision Detection http://www.silverlightshow.net/items/XNA-for-Silverlight-developers-Part-7-Collision-detection.aspx Markus Ewald (@Cygon4) shares the full Ninject 2.0 binding for XNA and Sunburn http://twitter.com/#!/Cygon4/status/48330203826622464 Michael B. McLaughlin shares an AccelerometerInput XNA GameComponent he created (which I’m probably going to snag for a game I’m working on...) http://geekswithblogs.net/mikebmcl/archive/2011/03/17/accelerometerinput-xna-gamecomponent.aspx Extra Credit tackles the building of a good tutorial. Must watch for all Indie game devs (thanks for pointing it out Evan Johnson!) http://twitter.com/#!/johnsonevan/status/48452115680604160 http://www.escapistmagazine.com/videos/view/extra-credits/2921-Tutorials-101 ExEn is fully funded at this point so definitely something for XBLIG developers to keep an eye on as they consider releasing their games on other platforms http://rockethub.com/projects/752-exen-xna-for-iphone-android-and-silverlight Channel 9 and Greg Duncan post Mixing the Game State Management and Platformer XNA Recipes http://channel9.msdn.com/coding4fun/blog/Mixing-the-Game-State-Management-and-Platformer-XNA-Recipes Sgt. Conker has noticed Mike McLaughlin has been crazy productive and has done a recap of his recent posts http://www.sgtconker.com/2011/03/recap-of-mikebmcls-posts/

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  • SQL SERVER – List of Article on Expressor Data Integration Platform

    - by pinaldave
    The ability to transform data into meaningful and actionable information is the most important information in current business world. In this fast growing and changing business needs effective data integration is single most important thing in making proper decision making. I have been following expressor software since November 2010, when I met expressor team in Seattle. Here are my posts on their innovative data integration platform and expressor Studio, a free desktop ETL tool: 4 Tips for ETL Software IDE Developers Introduction to Adaptive ETL Tool – How adaptive is your ETL? Sharing your ETL Resources Across Applications with Ease expressor Studio Includes Powerful Scripting Capabilities expressor 3.2 Release Review 5 Tips for Improving Your Data with expressor Studio As I had mentioned in some of my blog posts on them, I encourage you to download and test-drive their Studio product – it’s free. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Documentation, SQL Download, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: SSIS

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  • I don't get object-oriented programming

    - by Joel J. Adamson
    Note: this question is an edited excerpt from a blog posting I wrote a few months ago. After placing a link to the blog in a comment on Programmers.SE someone requested that I post a question here so that they could answer it. This posting is my most popular, as people seem to type "I don't get object-oriented programming" into Google a lot. Feel free to answer here, or in a comment at Wordpress. What is object-oriented programming? No one has given me a satisfactory answer. I feel like you will not get a good definition from someone who goes around saying “object” and “object-oriented” with his nose in the air. Nor will you get a good definition from someone who has done nothing but object-oriented programming. No one who understands both procedural and object-oriented programming has ever given me a consistent idea of what an object-oriented program actually does. Can someone please give me their ideas of the advantages of object-oriented programming?

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  • Parsing Extended Events xml_deadlock_report

    - by Michael Zilberstein
    Jonathan Kehayias and Paul Randall posted more than a year ago great articles on how to monitor historical deadlocks using Extended Events system_health default trace. Both tried to fix on the fly the bug in xml output that caused failures in xml validation. Today I've found out that their version isn't bulletproof either. So here is the fixed one: SELECT CAST ( xest.target_data as XML ) xml_data , * INTO #ring_buffer_data FROM     sys.dm_xe_session_targets xest    INNER...(read more)

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  • Design Book–Dimensional or No Dimensional, that is..the question

    - by drsql
    So, it is right there in the title of the book “Relational Database Design” etc (the title is kinda long :)  But as I consider what to cover and, conversely, what not to cover, dimensional design inevitably pops up. So I am considering including it in the book. One thing I try to do is to cover topics to a level where you can start using it immediately, and I am not sure that I could get a deep enough coverage of the subject to do that. I don’t really feel like it has to be the definitive source...(read more)

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  • An XEvent a Day (4 of 31) – Querying the Session Definition and Active Session DMV’s

    - by Jonathan Kehayias
    Yesterdays post, Managing Event Sessions , showed how to manage Event Sessions in Extended Events Sessions inside the Extended Events framework in SQL Server. In today's post, we’ll take a look at how to find information about the defined Event Sessions that already exist inside a SQL Server using the Session Definition DMV’s and how to find information about the Active Event Sessions that exist using the Active Session DMV’s. Session Definition DMV’s The Session Definition DMV’s provide information...(read more)

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  • Cumulative Updates for SQL Server 2005 SP3 and 2008 R2 are available

    - by AaronBertrand
    After releasing SQL Server 2005 SP4 on Friday (you can read more about it here ), the release services team did not hang up their hats for the Christmas holiday, but continued working on other releases. KB #2438344 : Cumulative update package 13 for SQL Server 2005 Service Pack 3 This brings your SQL Server 2005 SP3 build number to 9.00.4315 KB #2438347 : Cumulative Update package 5 for SQL Server 2008 R2 This brings your SQL Server 2008 R2 build number to 10.5.1753 NOTES: You will not be able to...(read more)

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  • New Cumulative Updates for SQL Server 2008 SP1 & R2!

    - by AaronBertrand
    Well, this is the first time in a long time that I've blogged about cumulative updates for two different versions of SQL Server on the same day. Yesterday Microsoft released a cumulative update for SQL Server 2008 SP1 (bringing you to 2775), and a corresponding cumulative update for SQL Server 2008 R2 RTM (bringing you from 1600 to 1702). You can read more about these updates here: Cumulative Update #1 for SQL Server 2008 R2 RTM ( KB #981355 ) Cumulative Update #8 for SQL Server 2008 Service Pack...(read more)

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  • Collation errors in business

    - by Rob Farley
    At the PASS Summit last month, I did a set (Lightning Talk) about collation, and in particular, the difference between the “English” spoken by people from the US, Australia and the UK. One of the examples I gave was that in the US drivers might stop for gas, whereas in Australia, they just open the window a little. This is what’s known as a paraprosdokian, where you suddenly realise you misunderstood the first part of the sentence, based on what was said in the second. My current favourite is Emo Phillip’s line “I like to play chess with old men in the park, but it can be hard to find thirty-two of them.” Essentially, this a collation error, one that good comedians can get mileage from. Unfortunately, collation is at its worst when we have a computer comparing two things in different collations. They might look the same, and sound the same, but if one of the things is in SQL English, and the other one is in Windows English, the poor database server (with no sense of humour) will get suspicious of developers (who all have senses of humour, obviously), and declare a collation error, worried that it might not realise some nuance of the language. One example is the common scenario of a case-sensitive collation and a case-insensitive one. One may think that “Rob” and “rob” are the same, but the other might not. Clearly one of them is my name, and the other is a verb which means to steal (people called “Nick” have the same problem, of course), but I have no idea whether “Rob” and “rob” should be considered the same or not – it depends on the collation. I told a lie before – collation isn’t at its worst in the computer world, because the computer has the sense to complain about the collation issue. People don’t. People will say something, with their own understanding of what they mean. Other people will listen, and apply their own collation to it. I remember when someone was asking me about a situation which had annoyed me. They asked if I was ‘pissed’, and I said yes. I meant that I was annoyed, but they were asking if I’d been drinking. It took a moment for us to realise the misunderstanding. In business, the problem is escalated. A business user may explain something in a particular way, using terminology that they understand, but using words that mean something else to a technical person. I remember a situation with a checkbox on a form (back in VB6 days from memory). It was used to indicate that something was approved, and indicated whether a particular database field should store True or False – nothing more. However, the client understood it to mean that an entire workflow system would be implemented, with different users have permission to approve items and more. The project manager I’d just taken over from clearly hadn’t appreciated that, and I faced a situation of explaining the misunderstanding to the client. Lots of fun... Collation errors aren’t just a database setting that you can ignore. You need to remember that Americans speak a different type of English to Aussies and Poms, and techies speak a different language to their clients.

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  • Practical Performance Monitoring and Tuning Event

    - by Andrew Kelly
      For any of you who may be interested or know of someone in the market for a performance Monitoring and Tuning class I have just the ticket for you. It’s a 3 day event that will be held in Atlanta Ga. on January 25th to the 27th 2011. For those of you that know me or have been to my sessions you realize I like to provide more than just classroom theory and like to teach real world and above all practical methodology when it comes to performance in SQL Server. This class covers all the essentials...(read more)

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  • Book Review: Pro SQL Server 2008 Relational Database Design and Implementation

    - by Alexander Kuznetsov
    Investing in proper database design is a very efficient way to cut maintenance costs. If we expect a system to last, we need to make sure it has a good solid foundation - high quality database design. Surely we can and sometimes do cut corners and save on database design to get things done faster. Unfortunately, such cutting corners frequently comes back and bites us: we may end up spending a lot of time solving issues caused by poor design. So, solid understanding of relational database design is...(read more)

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  • Kids don’t mark their own homework

    - by jamiet
    During a discussion at work today in regard to doing some thorough acceptance testing of the system that I currently work on the topic of who should actually do the testing came up. I remarked that I didn’t think that I as the developer should be doing acceptance testing and a colleague, Russ Taylor, agreed with me and then came out with this little pearler: Kids don’t mark their own homework Maybe its a common turn of phrase but I had never heard it before and, to me, it sums up very succinctly my feelings on the matter. I tweeted about it and it got a couple of retweets as well as a slightly different perspective from Bruce Durling who said: I'm of the opinion that testers should be in the dev team & the dev *team* should be responsible for quality Bruce makes a good point that testers should be considered part of the dev team. I agree wholly with that and don’t think that point of view necessarily conflicts with Russ’s analogy. Yes, developers should absolutely be responsible for testing their own work – I also think that in the murky world of data integration there is often a need for a 3rd party to validate that work. Improving testing mechanisms for data integration projects is something that is near and dear to my heart so I would welcome any other thoughts around this. Let me know if you have any in the comments! @Jamiet

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  • Windows Azure Use Case: Hybrid Applications

    - by BuckWoody
    This is one in a series of posts on when and where to use a distributed architecture design in your organization's computing needs. You can find the main post here: http://blogs.msdn.com/b/buckwoody/archive/2011/01/18/windows-azure-and-sql-azure-use-cases.aspx  Description: Organizations see the need for computing infrastructures that they can “rent” or pay for only when they need them. They also understand the benefits of distributed computing, but do not want to create this infrastructure themselves. However, they may have considerations that prevent them from moving all of their current IT investment to a distributed environment: Private data (do not want to send or store sensitive data off-site) High dollar investment in current infrastructure Applications currently running well, but may need additional periodic capacity Current applications not designed in a stateless fashion In these situations, a “hybrid” approach works best. In fact, with Windows Azure, a hybrid approach is an optimal way to implement distributed computing even when the stipulations above do not apply. Keeping a majority of the computing function in an organization local while exploring and expanding that footprint into Windows and SQL Azure is a good migration or expansion strategy. A “hybrid” architecture merely means that part of a computing cycle is shared between two architectures. For instance, some level of computing might be done in a Windows Azure web-based application, while the data is stored locally at the organization. Implementation: There are multiple methods for implementing a hybrid architecture, in a spectrum from very little interaction from the local infrastructure to Windows or SQL Azure. The patterns fall into two broad schemas, and even these can be mixed. 1. Client-Centric Hybrid Patterns In this pattern, programs are coded such that the client system sends queries or compute requests to multiple systems. The “client” in this case might be a web-based codeset actually stored on another system (which acts as a client, the user’s device serving as the presentation layer) or a compiled program. In either case, the code on the client requestor carries the burden of defining the layout of the requests. While this pattern is often the easiest to code, it’s the most brittle. Any change in the architecture must be reflected on each client, but this can be mitigated by using a centralized system as the client such as in the web scenario. 2. System-Centric Hybrid Patterns Another approach is to create a distributed architecture by turning on-site systems into “services” that can be called from Windows Azure using the service Bus or the Access Control Services (ACS) capabilities. Code calls from a series of in-process client application. In this pattern you move the “client” interface into the server application logic. If you do not wish to change the application itself, you can “layer” the results of the code return using a product (such as Microsoft BizTalk) that exposes a Web Services Definition Language (WSDL) endpoint to Windows Azure using the Application Fabric. In effect, this is similar to creating a Service Oriented Architecture (SOA) environment, and has the advantage of de-coupling your computing architecture. If each system offers a “service” of the results of some software processing, the operating system or platform becomes immaterial, assuming it adheres to a service contract. There are important considerations when you federate a system, whether to Windows or SQL Azure or any other distributed architecture. While these considerations are consistent with coding any application for distributed computing, they are especially important for a hybrid application. Connection resiliency - Applications on-premise normally have low-latency and good connection properties, something you’re not always guaranteed in a distributed and hybrid application. Whether a centralized client or a distributed one, the code should be able to handle extended retry logic. Authorization and Access - In a single authorization environment like a Active Directory domain, security is handled at a user-password level. In a distributed computing environment, you have more options. You can mitigate this with  using The Windows Azure Application Fabric feature of ACS to make the Azure application aware of the App Fabric as an ADFS provider. However, a claims-based authentication structure is often a superior choice.  Consistency and Concurrency - When you have a Relational Database Management System (RDBMS), Consistency and Concurrency are part of the design. In a Service Architecture, you need to plan for sequential message handling and lifecycle. Resources: How to Build a Hybrid On-Premise/In Cloud Application: http://blogs.msdn.com/b/ignitionshowcase/archive/2010/11/09/how-to-build-a-hybrid-on-premise-in-cloud-application.aspx  General Architecture guidance: http://blogs.msdn.com/b/buckwoody/archive/2010/12/21/windows-azure-learning-plan-architecture.aspx   

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  • Design Book–Fourth(last) Section (Physical Abstraction Optimization)

    - by drsql
    In this last section of the book, we will shift focus to the physical abstraction layer optimization. By this I mean the little bits and pieces of the design that is specifically there for performance and are actually part of the relational engine (read: the part of the SQL Server experience that ideally is hidden from you completely, but in 2010 reality it isn’t quite so yet.  This includes all of the data structures like database, files, etc; the optimizer; some coding, etc. In my mind, this...(read more)

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  • Hyper-Threading comments

    - by jchang
    There seems to be significant confusion about Hyper-Threading. Part of the problem is that vendors like to tout every new feature as the greatest invention since the six-pack, and its follow-on the 12-pack. I used to think the 4-pack was a travesty, but now that I am older and can nolonger finish a 12-pack with each meal, suddenly the 4-pack is not such a travesty. But I digress. I do appluad innovation, and I do accept that the first generation is almost never perfect, thats why its the bleeding...(read more)

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  • Quick note from JavaOne … check my twitter feed

    - by terrencebarr
    Just a quick note from JavaOne … excellent response to Oracle’s embedded Java announcements and strategy. Our DEMOGround booth is always busy – people want to learn more about Oracle Java ME Embedded 3.2, see it in action. Today’s keynote for the Java Embedded @ JavaOne sub conference was excellent – full house, great line up of partners and content. Haven’t had time to blog, but been tweeting about the latest news around embedded Java – be sure to monitor @terrencebarr. And check my last blog for embedded Java highlights. Oh, and check this latest summary on blogs.oracle.com “Huge Opportunity in Small Things” Cheers, – Terrence Filed under: Mobile & Embedded Tagged: "Oracle Java ME Embedded", embedded, Embedded Java, Java Embedded @ JavaOne, JavaOne

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