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• PowerPivot and the Slowly Changing Dimensions

  - by AlbertoFerrari

  Slowly changing dimensions are very common in the data warehouses and, basically, they store many versions of the same entity whenever a change happens in the columns for which history needs to be maintained. For example, the AdventureWorks data warehouse has a type 2 SCD in the DimProduct table. It can be easily checked for the product code “FR-M94S-38” which shows three different versions of itself, with changing product cost and list price. This is exactly what we can expect to find in any data...(read more)

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• How to monitor CPU usage and performance on a Hyper-V server with several VM's

  - by Bjørn

  Hello, I have a server that is running Windows 2008 64 bit Hyper-V, with 8 gigs of RAM and Intel Xeon X3440 @ 2.53 Ghz, which gives me 8 logical cores in the performance monitor on the host system. I have set up three Virtual Machines, all running Windows 2008 32 bit. Build server, running Team City Staging server SQL Server, running SQL Server 2005 I have some troubles with the setup in that the host monitor remains responsive at all times, even though the VM's are seemingly working at 100% cpu and are very sluggish and unresponsive. (I have asked a separate question about that.) So the question here is: What is the best way to monitor how the physical CPU's are actually utilized? The reason I am asking is that I am being told that i cannot reliably use the task manager to monitor CPU usage in a VM.

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• Curious about IObservable? Here’s a quick example to get you started!

  - by Roman Schindlauer

  Have you heard about IObservable/IObserver support in Microsoft StreamInsight 1.1? Then you probably want to try it out. If this is your first incursion into the IObservable/IObserver pattern, this blog post is for you! StreamInsight 1.1 introduced the ability to use IEnumerable and IObservable objects as event sources and sinks. The IEnumerable case is pretty straightforward, since many data collections are already surfacing as this type. This was already covered by Colin in his blog. Creating your own IObservable event source is a little more involved but no less exciting – here is a primer: First, let’s look at a very simple Observable data source. All it does is publish an integer in regular time periods to its registered observers. (For more information on IObservable, see http://msdn.microsoft.com/en-us/library/dd990377.aspx ). sealed class RandomSubject : IObservable<int>, IDisposable {     private bool _done;     private readonly List<IObserver<int>> _observers;     private readonly Random _random;     private readonly object _sync;     private readonly Timer _timer;     private readonly int _timerPeriod;       /// <summary>     /// Random observable subject. It produces an integer in regular time periods.     /// </summary>     /// <param name="timerPeriod">Timer period (in milliseconds)</param>     public RandomSubject(int timerPeriod)     {         _done = false;         _observers = new List<IObserver<int>>();         _random = new Random();         _sync = new object();         _timer = new Timer(EmitRandomValue);         _timerPeriod = timerPeriod;         Schedule();     }       public IDisposable Subscribe(IObserver<int> observer)     {         lock (_sync)         {             _observers.Add(observer);         }         return new Subscription(this, observer);     }       public void OnNext(int value)     {         lock (_sync)         {             if (!_done)             {                 foreach (var observer in _observers)                 {                     observer.OnNext(value);                 }             }         }     }       public void OnError(Exception e)     {         lock (_sync)         {             foreach (var observer in _observers)             {                 observer.OnError(e);             }             _done = true;         }     }       public void OnCompleted()     {         lock (_sync)         {             foreach (var observer in _observers)             {                 observer.OnCompleted();             }             _done = true;         }     }       void IDisposable.Dispose()     {         _timer.Dispose();     }       private void Schedule()     {         lock (_sync)         {             if (!_done)             {                 _timer.Change(_timerPeriod, Timeout.Infinite);             }         }     }       private void EmitRandomValue(object _)     {         var value = (int)(_random.NextDouble() * 100);         Console.WriteLine("[Observable]\t" + value);         OnNext(value);         Schedule();     }       private sealed class Subscription : IDisposable     {         private readonly RandomSubject _subject;         private IObserver<int> _observer;           public Subscription(RandomSubject subject, IObserver<int> observer)         {             _subject = subject;             _observer = observer;         }           public void Dispose()         {             IObserver<int> observer = _observer;             if (null != observer)             {                 lock (_subject._sync)                 {                     _subject._observers.Remove(observer);                 }                 _observer = null;             }         }     } }   So far, so good. Now let’s write a program that consumes data emitted by the observable as a stream of point events in a Streaminsight query. First, let’s define our payload type: class Payload {     public int Value { get; set; }       public override string ToString()     {         return "[StreamInsight]\tValue: " + Value.ToString();     } }   Now, let’s write the program. First, we will instantiate the observable subject. Then we’ll use the ToPointStream() method to consume it as a stream. We can now write any query over the source - here, a simple pass-through query. class Program {     static void Main(string[] args)     {         Console.WriteLine("Starting observable source...");         using (var source = new RandomSubject(500))         {             Console.WriteLine("Started observable source.");             using (var server = Server.Create("Default"))             {                 var application = server.CreateApplication("My Application");                   var stream = source.ToPointStream(application,                     e => PointEvent.CreateInsert(DateTime.Now, new Payload { Value = e }),                     AdvanceTimeSettings.StrictlyIncreasingStartTime,                     "Observable Stream");                   var query = from e in stream                             select e;                   [...]   We’re done with consuming input and querying it! But you probably want to see the output of the query. Did you know you can turn a query into an observable subject as well? Let’s do precisely that, and exploit the Reactive Extensions for .NET (http://msdn.microsoft.com/en-us/devlabs/ee794896.aspx) to quickly visualize the output. Notice we’re subscribing “Console.WriteLine()” to the query, a pattern you may find useful for quick debugging of your queries. Reminder: you’ll need to install the Reactive Extensions for .NET (Rx for .NET Framework 4.0), and reference System.CoreEx and System.Reactive in your project.                 [...]                   Console.ReadLine();                 Console.WriteLine("Starting query...");                 using (query.ToObservable().Subscribe(Console.WriteLine))                 {                     Console.WriteLine("Started query.");                     Console.ReadLine();                     Console.WriteLine("Stopping query...");                 }                 Console.WriteLine("Stopped query.");             }             Console.ReadLine();             Console.WriteLine("Stopping observable source...");             source.OnCompleted();         }         Console.WriteLine("Stopped observable source.");     } }   We hope this blog post gets you started. And for bonus points, you can go ahead and rewrite the observable source (the RandomSubject class) using the Reactive Extensions for .NET! The entire sample project is attached to this article. Happy querying! Regards, The StreamInsight Team

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• Have You Heard About Project Lucy?

  - by KKline

  Lucy, You Got Some 'Splainin to Do!' Quest Software's latest community initiative, Windows Azure-based Project Lucy, has debuted! Project Lucy is part infrastructure analytics, part social media experiment, and part performance data warehouse. The best things about Project Lucy include: It’s Free - just like our SQLServerPedia website, Project Lucy is free to anyone who wants to upload a trace file It’s 1oo% web-based - you don’t have to download or maintain anything and updates roll out seamlessly,...(read more)

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• PowerPivot and the Slowly Changing Dimensions

  - by AlbertoFerrari

  Slowly changing dimensions are very common in the data warehouses and, basically, they store many versions of the same entity whenever a change happens in the columns for which history needs to be maintained. For example, the AdventureWorks data warehouse has a type 2 SCD in the DimProduct table. It can be easily checked for the product code “FR-M94S-38” which shows three different versions of itself, with changing product cost and list price. This is exactly what we can expect to find in any data...(read more)

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• An OLAP client!

  - by Davide Mauri

  While surfing CodePlex I’ve come across a very interesting tool for all BI Developers who misses a decent OLAP client where to write, run & test MDX queries http://ranetuilibraryolap.codeplex.com/ I’ve not tested it yet, but I’ll surely do this week and I’ll post my impressions ASAP. The first impression, just looking the CodePlex page, is that tool Rocks!!!!! Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• SyncToBlog #10 Lots of Azure and Cloud Links including MIX10 videos

  - by Eric Nelson

  Just getting a few interesting cloud links “down on paper”. I last did one of these on Azure in Feb 20010. Cloud Links: Article on Debugging in the Cloud http://code.msdn.microsoft.com/azurescale  A sample app that demonstrates monitoring and automatically scaling an Azure application in response to dropping performance etc. Basically a console app that checks perf stats and then uses the Service Management API to spin up new instances when needed. Azure In Action book is imminent :) Running Memcached in Windows Azure from the MS UK team Using Microsoft Codename Dallas as a data source for Drupal also from the MS UK team I often mention them – but this post is the biz! Metodi on fault and upgrade domains Detailed blog post on comparing Azure AppFabric Service Bus REST support to the free Faye Ruby+JavaScript gem that implements the JSON publish/subscribe protocol Bayeux. AppFabric LABS allow you to test out and play with experimental AppFabric technologies. Details of the upcoming VM support in Windows Azure Nice series of posts from J D Meier in the Patterns and Practice team How To Use ASP.NET Forms Auth with Azure Tables  How To Use ASP.NET Forms Auth with Roles in Azure Tables How To Use ASP.NET Forms Auth with SQL Server on Windows Azure And sessions from MIX10 held March 15th to 17th: Lap around the Windows Azure Platform – Steve Marx Building and Deploying Windows Azure Based Applications with Microsoft Visual Studio 2010 – Jim Nakashima Building PHP Applications using the Windows Azure Platform – Craig Kitterman, Sumit Chawla Using Ruby on Rails to Build Windows Azure Applications – Sriram Krishnan Microsoft Project Code Name “Dallas": Data for your apps – Moe Khosravy Using Storage in the Windows Azure Platform – Chris Auld Building Web Applications with Windows Azure Storage – Brad Calder Building Web Application with Microsoft SQL Azure – David Robinson Connecting Your Applications in the Cloud with Windows Azure AppFabric – Clemens Vasters Microsoft Silverlight and Windows Azure: A Match Made for the Web – Matt Kerner Something for everyone :)

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• Some date math fun

  - by drsql

  Note: This concept presented is pretty simple and I am not claiming that I am the first to do this… so if you were the one who came up with this, let me know and I will give you linkage Today I was needing to get the data for the current month for a query, and it hit me that I really didn’t have a good way to do this.  There were two common methods that people use: WHERE YEAR(MonthColumn) = YEAR(Getdate()) AND MONTH(MonthColumn) = MONTH(Getdate()) But this particular method is pretty horrible...(read more)

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• Some date math fun

  - by drsql

  Note: This concept presented is pretty simple and I am not claiming that I am the first to do this… so if you were the one who came up with this, let me know and I will give you linkage Today I was needing to get the data for the current month for a query, and it hit me that I really didn’t have a good way to do this.  There were two common methods that people use: WHERE YEAR(MonthColumn) = YEAR(Getdate()) AND MONTH(MonthColumn) = MONTH(Getdate()) But this particular method is pretty horrible...(read more)

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• Survey: How's Your Economy?

  - by andyleonard

  Another quick survey question, slightly off-topic: How's your economy? Have things picked up for you recently? Slowed down? Remained static? :{> Andy Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!...(read more)

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• My Name is Andy and I Have an Associates of Applied Science Degree

  - by andyleonard

  Introduction This post is the forty-first part of a ramble-rant about the software business. The current posts in this series can be found on the series landing page . This post is about the education requirements for job listings. Bachelor’s Degree Required I’m not qualified for any job that requires a bachelor’s degree because I don’t have one. I regularly receive email from recruiters asking if I’m available and interested in a position they have open, or a position they’ve been asked to fill...(read more)

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• Internet Explorer 9 Cannot open file on download CTRL + J doesn’t work can’t open list of downloads

  - by simonsabin

  If any of the above symptoms are causing a problem, i.e. 1. You download a file and the download dialog disappears. 2. You select open when you download a file and nothing happens. 3. The View Downloads doesn’t work 4. CTRL + J doesn’t work (view downloads) The solution is to clear your download history See IE9 - View downloads / Ctrl+J do not open. I cannot open any file. But SAVE function still work fine. 64 bit version. for details the answer is provided by Steven. S on June 20th. I hope that...(read more)

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• Storage Configuration

  - by jchang

  Storage performance is not inherently complicated subject. The concepts are relatively simple. In fact, scaling storage performance is far easier compared with the difficulties encounters in scaling processor performance in NUMA systems. Storage performance is achieved by properly distributing IO over: 1) multiple independent PCI-E ports (system memory and IO bandwith is key) 2) multiple RAID controllers or host bus adapters (HBAs) 3) multiple storage IO channels (SAS or FC, complete path) most importantly,...(read more)

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• Simple Criminal Minds

  - by andyleonard

  My favorite mother-in-law hooked my bride on the television series Criminal Minds during her last visit. I started watching the show as well, and sort of followed along. I was ok with the show until a recent episode in which Fonzie used his motorcycle to jump a shark in a pool in front of Al's. Ok, wrong show. Sort of. For those unfamiliar with the show, Criminal Minds is about the FBI's Behavioral Analysis Unit. Profilers, in other words. They're called to various places around the country to profile...(read more)

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• I Start!

  - by andyleonard

  I originally titled this post "I Quit!" but decided that doesn't set the proper tone and definitely does not match my feelings about the upcoming transitions in my life. "I Start!" is much more appropriate! Introduction I've tendered my resignation from the position of Manager, ETL Team, Data Management Group, Molina Medicaid Solutions effective Friday 14 Jan 2011. "There I Was..." In 2008 my consultant billable-days - the metric I use to determine how business is going - dropped from 20 / month...(read more)

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• Denali Paging–Key seek lookups

  - by Dave Ballantyne

  In my previous post “Denali Paging – is it win.win ?” I demonstrated the use of using the Paging functionality within Denali.  On reflection,  I think i may of been a little unfair and should of continued always planned to continue my investigations to the next step. In Pauls article, he uses a combination of ctes to first scan the ordered keys which is then filtered using TOP and rownumber and then uses those keys to seek the data.  So what happens if we replace the scanning portion of the code with the denali paging functionality. Heres the original procedure,  we are going to replace the functionality of the Keys and SelectedKeys ctes : CREATE  PROCEDURE dbo.FetchPageKeySeek         @PageSize   BIGINT,         @PageNumber BIGINT AS BEGIN         -- Key-Seek algorithm         WITH    Keys         AS      (                 -- Step 1 : Number the rows from the non-clustered index                 -- Maximum number of rows = @PageNumber * @PageSize                 SELECT  TOP (@PageNumber * @PageSize)                         rn = ROW_NUMBER() OVER (ORDER BY P1.post_id ASC),                         P1.post_id                 FROM    dbo.Post P1                 ORDER   BY                         P1.post_id ASC                 ),                 SelectedKeys         AS      (                 -- Step 2 : Get the primary keys for the rows on the page we want                 -- Maximum number of rows from this stage = @PageSize                 SELECT  TOP (@PageSize)                         SK.rn,                         SK.post_id                 FROM    Keys SK                 WHERE   SK.rn > ((@PageNumber - 1) * @PageSize)                 ORDER   BY                         SK.post_id ASC                 )         SELECT  -- Step 3 : Retrieve the off-index data                 -- We will only have @PageSize rows by this stage                 SK.rn,                 P2.post_id,                 P2.thread_id,                 P2.member_id,                 P2.create_dt,                 P2.title,                 P2.body         FROM    SelectedKeys SK         JOIN    dbo.Post P2                 ON  P2.post_id = SK.post_id         ORDER   BY                 SK.post_id ASC; END; and here is the replacement procedure using paging: CREATE  PROCEDURE dbo.FetchOffsetPageKeySeek         @PageSize   BIGINT,         @PageNumber BIGINT AS BEGIN         -- Key-Seek algorithm         WITH    SelectedKeys         AS      (                 SELECT  post_id                 FROM    dbo.Post P1                 ORDER   BY post_id ASC                 OFFSET  @PageSize * (@PageNumber-1) ROWS                 FETCH NEXT @PageSize ROWS ONLY                 )         SELECT  P2.post_id,                 P2.thread_id,                 P2.member_id,                 P2.create_dt,                 P2.title,                 P2.body         FROM    SelectedKeys SK         JOIN    dbo.Post P2                 ON  P2.post_id = SK.post_id         ORDER   BY                 SK.post_id ASC; END; Notice how all i have done is replace the functionality with the Keys and SelectedKeys CTEs with the paging functionality. So , what is the comparative performance now ?. Exactly the same amount of IO and memory usage , but its now pretty obvious that in terms of CPU and overall duration we are onto a winner.    

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• Congratulations 2010 Microsoft MVP, woo hoo 5th time now

  - by ssqa.net

  Well, its April 01st again and a big day for me 2 important events to note (daughter's birthday and MVP renewal notification). After a long travel from London to Hyderabad after speaking at UK AIC 2010 conference, I was able to make it by half day here for my daughter's birthday, phew. Then next one awaiting official confirmation about MVP renewal (April - Mar cycle), woo hooo here is one.... Dear Satya Jayanty, Congratulations! We are pleased to present you with the 2010 Microsoft® MVP Award...(read more)

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• OWB 11gR2 - Windows and Linux 64-bit clients available

  - by David Allan

  In addition to the integrated release of OWB in the 11.2.0.3 Oracle database distribution, the following 64-bit standalone clients are now available for download from Oracle Support. OWB 11.2.0.3 Standalone client for Windows 64-bit - 13365470 OWB 11.2.0.3 Standalone client for Linux X86 64-bit - 13366327 This is in addition to the previously released 32-bit client on Windows. OWB 11.2.0.3 Standalone client for Windows 32-bit - 13365457 The support document Major OWB 11.2.0.3 New Features Summary has details for OWB 11.2.0.3 which include the following. Exadata v2 and oracle Database 11gR2 support capabilities; Support for Oracle Database 11gR2 and Exadata compression types Even more partitioning: Range-Range, Composite Hash/List, System, Reference Transparent Data Encryption support Data Guard support/certification Compiled PL/SQL code generation Capabilities to support data warehouse ETL best practices; Read and write Oracle Data Pump files with external tables External table preprocessor Partition specific DML Bulk data movement code templates: Oracle, IBM DB2, Microsoft SQL Server to Oracle Integration with Fusion Middleware capabilities; Support OWB's Control Center Agent on WLS Lots of interesting capabilities in 11.2.0.3 and the availability of the 64-bit client I'm sure is welcome news for many!

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• Reverse Engineering a Server Side Trace

  How to reverse engineer or script a trace for disaster recovery, or simply scripting for enhance and adjustment.

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• Sessions I Submitted to the PASS Summit 2010

  - by andyleonard

  Introduction I'm borrowing an idea and blog post title from Brent Ozar ( Blog - @BrentO ). I am honored the PASS Summit 2010 (Seattle, 8 - 11 Nov 2010) would consider allowing me to present. It's a truly awesome event. If you have an opportunity to attend and read this blog, please find me and introduce yourself. If you've built a cool solution to a business or technical problem; or written a script - or a bunch of scripts - to automate part of your daily / weekly / monthly routine; or have some...(read more)

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• PASS 13 Dispatches: Memory Optimized = On

  - by Tony Davis

  I'm at the PASS Summit in Charlotte for the Day 1 keynote by Quentin Clarke, Corporate VP of the data platform group at Microsoft. He's talking about how SQL Server 2014 is “pushing boundaries” and first up is SQL Server 2014's In-Memory OLTP technology (former codename “hekaton”) It is a feature that provokes a lot of interest and for good reason as, without any need for application rewrites or hardware updates, it can enable us to ensure that an application can find in memory most or all of the data it needs, and can lead to huge improvements in processing times. A good recent hekaton use cases article talks about applications that need a “Shock Absorber” when either spikes or just a high rate of incoming workload (including data in ETL scenarios) become a primary bottleneck. To get a really deep look at this technology, I would check out David DeWitt's summit keynote tomorrow (it will be live streamed). Other than that, to get started I'd recommend Kalen Delaney's whitepaper. She offers a lot of insight into how it works and how to start to define memory-optimized tables, and natively compiled stored procedures. These memory-optimized tables uses completely optimistic multi-version concurrency control – no waiting on locks! After that, Tom LaRock has compiled a useful set of links to drill deeper, and includes one to Microsoft's AMR tool to help you gauge the tables that might benefit most. Tony.

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• Free Windows Azure event next Monday in London (29th March)

  - by Eric Nelson

  I just heard that we still have spaces for this event happening next week (29th March 2010). Whilst the event is designed for start-ups, I’m sure nobody would notice if you snuck in :-) Just keep it to yourself ;-) Register using invitation code: 79F2AB. Hope to see you there. The agenda is looking pretty swish: 09:00 – 09:30 Registration 09:30 - 10:15 Keynote  ‘I’ve looked at clouds from both sides now....’– John Taysom, Active Seed Investor 10:15 - 10:45   The Microsoft Vision for Cloud Computing – Steve Clayton, Director Software + Services, EMEA 10:45 - 11:00   Break 11:00 - 12:30 “Windows Azure in Real World” – hear from startups that have built their business around the Azure platform, moderated by Alistair Beagley, Azure UK Developer and Platform Lead 12:30 - 13:15 Lunch and networking  13:15 - 14:15  Breakout Tracks, moderated by our Azure Experts 1. Windows Azure Technical Overview - David Gristwood, Application Architect, Microsoft 2. SQL Azure Technical Overview – Eric Nelson, Application Architect, Microsoft 3. Commercial insight into Windows Azure and what this means for BizSpark Start-ups - Simon Karn, Commercial Lead, UK Windows Azure Incubation Team, Microsoft 14:15 - 14:30 Session change over 14:30 - 15:30   Breakout Tracks, moderated by our Azure Experts 1. SQL Azure Technical Overview (repeat) - Eric Nelson, Application Architect, Microsoft 2. Deep dive into Windows Azure – Neil Kidd, Architect, Microsoft Technology Centre 3. Lessons Learnt - Windows Azure in the Real World interactive session – Two customers hosted by Matt Deacon, Enterprise Architect, Microsoft 15:30 - 16:00 Break & Session change over 16:00 - 17:00 Breakout Tracks, moderated by our Azure Experts 1. PHP / Ruby on Azure Simon Davies, Architect, UK Windows Azure Incubation Team, Microsoft 2. Commercial insight into Windows Azure and what this means for BizSpark Start-ups (repeat) - Simon Karn, Commercial Lead, UK Windows Azure Incubation Team, Microsoft 3. Lessons Learnt - Windows Azure in the Real World interactive session #2 Two customers hosted by Matt Deacon, Enterprise Architect, Microsoft 17:00 - 18:00 Pitches and Judging 18:15 Wrap-up and close 18:15 - 20:00 Drinks & Networking

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• Good News for Women in Technology - Barbie Has Joined the IT Scene

  - by KKline

  Notice the bluetooth ear piece fashion faux pas? Yes, she's truly a geek. I'm happy to report that Barbie is now a cognizeti, a digerati, ... yes even an IT Professional! This year's new Barbie is Computer Engineer Barbie . Several months back, I encouraged all my friends and followers on Twitter to vote for the IT job for Barbie in Mattel's recent public job selection for the eponymous doll. That encouragement was founded in an experience I'd had years earlier - becoming a dad to a very beautiful...(read more)

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• Why We Write #6-An Interview with Kevin Kline

  - by drsql

  Wow, so far in this series, I have interviewed some very good friends, and some truly excellent writers (and usually both), but today, following on the heels of Jason Strate , we are going to hit someone whose name is synonymous with community, a person who really needs no introduction. According to Bing, Kevin Kline ( @kekline ) is the most important Kevin Kline on Twitter (though it clearly could be due to my typical searches, I am giving him the benefit of the doubt… here try it yourself: http://www.bing.com/search?q=kevin+kline+twitter...(read more)

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• Intel Xeon 5600 (Westmere-EP) and AMD Magny-Cours Performance Update

  - by jchang

  HP has just released TPC-C and TPC-E results for the ProLiant DL380G7 with 2 Xeon 5680 3.33GHz 6-core processor, allowing a direct comparison with their DL385G& with 2 Opteron 6176 2.3GHz 12-core processors. Last month I complained about the lack of performance results for the Intel Xeon 5600 6-core 32nm processor line for 2-way systems. This might have been deliberate to not complicate the message for the Xeon 7500 8-core 45nm (for 4-way+ systems) launch two weeks later. http://sqlblog.com/blogs/joe_chang/archive/2010/04/07/intel-xeon-5600-westmere-ep-and-7500-nehalem-ex.aspx...(read more)

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