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  • when to introduce an application services tier in an n-tier application

    - by user20358
    I am developing a web based application whose primary objective is to fetch data from the database, display it on the UI, take in user inputs and write them back to the database. The application is not going to be doing any industrial strength algorithm crunching, but will be receiving a very high number of hits at peak times (described below) which will be changing thru the day. The layers are your typical Presentation, Business, Data. The data layer is taken care of by the database server. The business layer will contain the DAL component to access the database server over tcp. The choices I have to separate these layers into tiers are: The presentation and business layers can be either kept on the same tier. The presentation layer on a separate tier by itself and the business layer on a separate tier by itself. In the case of choice 2, the business layer will be accessed by the presentation layer using a WCF service either over http or tcp. I don't see any heavy processing being done on the Business layer, so I am leaning towards option 1 above. I also feel for the same reason, adding a new tier will only introduce the network latency. However, in terms of scalability in case I need to scale up or scale out, which is a better way to go? This application will need to be able to support up to 6 million users an hour. There will be a reasonable amount of data in each user session, storing user's preferences and other details. I will be using page level caching as well.

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  • Read/Select:Connection reset by peer (10054) during remote logoff in RealVNC

    - by Santhosh
    I am using RealVNC 4.5 Enterprise on my Windows 7 client. I use this to connect to a remote system which is also running RealVNC 4.5 (on Windows 7 again). And then i logoff the remote system (server) and all of a sudden the realvnc viewer on the client closes with the message : "Read/Select:Connection reset by peer (10054)" It also asks if i want to reconnect again. Any idea why this is happening and how do i resolve this?

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  • Easy remote communication without WCF

    - by Ralf Westphal
    If you´ve read my previous posts about why I deem WCF more of a problem than a solution and how I think we should switch to asynchronous only communication in distributed application, you might be wondering, how this could be done in an easy way. Since a truely simple example to get started with WCF still is drawing quite some traffic to this blog, let me pick up on that and show you, how to accomplish the same but much easier with an async communication API. For simplicities sake let me put all...(read more)

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  • Deploying SSIS to Integration Services Catalog (SSISDB) via SQL Server Data Tools

    - by Kevin Shyr
    There are quite a few good articles/blogs on this.  For a straight forward deployment, read this (http://www.bibits.co/post/2012/08/23/SSIS-SQL-Server-2012-Project-Deployment.aspx).  For a more dynamic and comprehensive understanding about all the different settings, read part 1 (http://www.mssqltips.com/sqlservertip/2450/ssis-package-deployment-model-in-sql-server-2012-part-1-of-2/) and part 2 (http://www.mssqltips.com/sqlservertip/2451/ssis-package-deployment-model-in-sql-server-2012-part-2-of-2/) Microsoft official doc: http://technet.microsoft.com/en-us/library/hh213373 This only thing I would add is the following.  After your first deployment, you'll notice that the subsequent deployment skips the second step (go directly "Select Destination" and skipped "Select Source").  That's because after your initial deployment, a ispac file is created to track deployment.  If you decide to go back to "Select Source" and select SSIS catalog again, the deployment process will complete, but the packages will not be deployed.

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  • Cross-platform desktop programming: C++ vs. Python

    - by John Wells
    Alright, to start off, I have experience as an amateur Obj-C/Cocoa and Ruby w/Rails programmer. These are great, but they aren't really helpful for writing cross-platform applications (hopefully GNUStep will one day be complete enough for the first to be multi platform, but that day is not today). C++, from what I can gather, is extremely powerful but also a huge, ugly behemoth that can take half a decade or more to master. I've also read that you can very easily not only shoot yourself in the foot, but blow your entire leg off with it since memory management is all manual. Obviously, this is all quite intimidating. Is it correct? Python seems to provide most of the power of C++ and is much easier to pick up at the cost of speed. How big is this sacrifice? Is it meaningful or can it be ignored? Which will have me writing fast, stable, highly reliable applications in a reasonable amount of time? Also, is it better to use Qt for your UI or instead maintain separate, native front ends for each platform? EDIT: For extra clarity, there are two types applications I want to write: one is an extremely friendly and convenient database frontend and the other, which no doubt will come much later on, is a 3D world editor.

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  • Palm Centro not even appearing on desktop

    - by DaimyoKirby
    Background: I'm trying to set up my dad's new installation of Xubuntu 12.10 (I finally got him to switch from Windows :-D) so he can sync his Palm Centro on his computer. I installed J-Pilot, but the problem is that his palm isn't even showing up anywhere on the computer. When it's plugged in, it lit up and began to charge when I told it to try and sync with the computer, but it failed the sync and Xubuntu still doesn't recognize it. Question: Does anyone know how I can get his Palm to be recognized by Xubuntu?

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  • Semi-blocking Transformations in SQL Server Integration Services SSIS

    In a SSIS data flow, there are multiple types of transformations. On one hand you have synchronous and asynchronous transformations, but on the other hand you have non-blocking, semi-blocking and fully-blocking components. In this tip, Koen Verbeeck takes a closer look on the performance impact of semi-blocking transformations in SSIS. Can 41,000 DBAs really be wrong? Join 41,000 other DBAs who are following the new series from the DBA Team: the 5 Worst Days in a DBA’s Life. Part 3, As Corrupt As It Gets, is out now – read it here.

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  • how can I disable ssh prompt from kvm remote

    - by kamil
    when I upgraded my KVM virtual machine manager to the latest version I got a question prompt every time I try to connect remotely to my machines: The authenticity of host 'kvm.local (ip address)' can't be established. ECDSA key fingerprint is b5:fa:0a:d0:39:af:0a:60:fa:04:87:6c:31:1d:13:15. Are you sure you want to continue connecting (yes/no)? And when changing any setting on a VM I was obliged to type yes and then type the root password in another dialog using ubuntu 12.04 64bit

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  • SQL Server Integration Services 2008: Importing Excel Data Using Derived Column Transformation

    The complexity involved in transferring data between Excel and SQL Server results from different and sometimes incompatible data types. The Import and Export wizard mitigates potential issues introduced by these incompatibilities by taking advantage of Data Conversion Transformation. Marcin Policht describes another approach that produces an equivalent outcome by employing Derived Column Transformation instead.

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  • WIF, ADFS 2 and WCF&ndash;Part 6: Chaining multiple Token Services

    - by Your DisplayName here!
    See the previous posts first. So far we looked at the (simpler) scenario where a client acquires a token from an identity provider and uses that for authentication against a relying party WCF service. Another common scenario is, that the client first requests a token from an identity provider, and then uses this token to request a new token from a Resource STS or a partner’s federation gateway. This sounds complicated, but is actually very easy to achieve using WIF’s WS-Trust client support. The sequence is like this: Request a token from an identity provider. You use some “bootstrap” credential for that like Windows integrated, UserName or a client certificate. The realm used for this request is the identifier of the Resource STS/federation gateway. Use the resulting token to request a new token from the Resource STS/federation gateway. The realm for this request would be the ultimate service you want to talk to. Use this resulting token to authenticate against the ultimate service. Step 1 is very much the same as the code I have shown in the last post. In the following snippet, I use a client certificate to get a token from my STS: private static SecurityToken GetIdPToken() {     var factory = new WSTrustChannelFactory(         new CertificateWSTrustBinding(SecurityMode.TransportWithMessageCredential,         idpEndpoint);     factory.TrustVersion = TrustVersion.WSTrust13;       factory.Credentials.ClientCertificate.SetCertificate(         StoreLocation.CurrentUser,         StoreName.My,         X509FindType.FindBySubjectDistinguishedName,         "CN=Client");       var rst = new RequestSecurityToken     {         RequestType = RequestTypes.Issue,         AppliesTo = new EndpointAddress(rstsRealm),         KeyType = KeyTypes.Symmetric     };       var channel = factory.CreateChannel();     return channel.Issue(rst); } To use a token to request another token is slightly different. First the IssuedTokenWSTrustBinding is used and second the channel factory extension methods are used to send the identity provider token to the Resource STS: private static SecurityToken GetRSTSToken(SecurityToken idpToken) {     var binding = new IssuedTokenWSTrustBinding();     binding.SecurityMode = SecurityMode.TransportWithMessageCredential;       var factory = new WSTrustChannelFactory(         binding,         rstsEndpoint);     factory.TrustVersion = TrustVersion.WSTrust13;     factory.Credentials.SupportInteractive = false;       var rst = new RequestSecurityToken     {         RequestType = RequestTypes.Issue,         AppliesTo = new EndpointAddress(svcRealm),         KeyType = KeyTypes.Symmetric     };       factory.ConfigureChannelFactory();     var channel = factory.CreateChannelWithIssuedToken(idpToken);     return channel.Issue(rst); } For this particular case I chose an ADFS endpoint for issued token authentication (see part 1 for more background). Calling the service now works exactly like I described in my last post. You may now wonder if the same thing can be also achieved using configuration only – absolutely. But there are some gotchas. First of all the configuration files becomes quite complex. As we discussed in part 4, the bindings must be nested for WCF to unwind the token call-stack. But in this case svcutil cannot resolve the first hop since it cannot use metadata to inspect the identity provider. This binding must be supplied manually. The other issue is around the value for the realm/appliesTo when requesting a token for the R-STS. Using the manual approach you have full control over that parameter and you can simply use the R-STS issuer URI. Using the configuration approach, the exact address of the R-STS endpoint will be used. This means that you may have to register multiple R-STS endpoints in the identity provider. Another issue you will run into is, that ADFS does only accepts its configured issuer URI as a known realm by default. You’d have to manually add more audience URIs for the specific endpoints using the ADFS Powershell commandlets. I prefer the “manual” approach. That’s it. Hope this is useful information.

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  • Pix for visual studio express 2012 (Desktop)

    - by JohnB
    (Originally asked on stackoverflow) Using visual c++ express 2010 for direct3d you have to download the directX sdk and there is a tool called pix for debugging shaders, looking at 3d resources etc. With visual studio 2012 express the directx sdk is included in the windows sdk that comes with it but this does not seem to include the winpix.exe tool. Is this very useful tool still available? I guess I can still use the one from the previous sdk but it seems wrong to install the entire sdk just for that tool. Is there a version for VS2012 express that I'm missing?

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  • Mac has "show desktop" function?

    - by George2
    Hello everyone, I am using MacBook Pro Mac OS 10.5. I am new to this development environment. I am previous working on Windows. I am wondering whether there is similar function like "show desktop" (shortcut is Windows Key + D) on Mac to Windows, which will hide all applications and show a clean desktop? THis function is very convenient for my development on Mac. thanks in advance, George

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  • Fiber-Optic Cable Trick Brings Remote Triggering to Older Flashes

    - by Jason Fitzpatrick
    Many older flashes lack for a jack to input a sync cable and rely exclusively on a simple slave mode triggered by the primary flash. This hack uses a piece of scrap fiber optic cable to trigger the flash in bright conditions. Using a flash as an optical slave indoors isn’t much of a problem, but if you introduce bright light (such as outdoor lighting conditions), the ambient light can overpower the small on-camera flash and render the optical slave function useless. To overcome this, Marcell over at Fiber Strobe (a blog dedicated to cataloging experiments in incorporating fiber optics into photography) came up with a simple work around. By using some foam crafting materials and tape, he whipped up a simple mount for a strand of scrap fiber optic cable to connect between the on-camera flash and the sensor on the slave flash. Once attached it works exactly like as sync cable would, except it’s transmitting a pulse of light instead of a pulse of electricity. Hit up the link below for more pictures and a build guide. DIY Fiber Sync Cord [via DIY Photography] HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux Hack Your Kindle for Easy Font Customization

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  • Ubuntu server Mysql remote access from MySQL Workbench

    - by goodseller
    I have a newly install ubuntu installed the mysql server. After the basic config, I changed the my.cnf file and commented the bind_address I can start the server and added iptable for 3306. I also add the privileges to mysql server as follow: GRANT ALL PRIVILEGES ON . TO 'root'@'%' IDENTIFIED BY 'P@ssw0rd' WITH GRANT OPTION; FLUSH PRIVILEGES; exit However after connected from the mysql workbench, it shows no database. But it seems that have login. Anyone have faced that or can help me? Thx!

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  • Cannot right click desktop windows xp

    - by Robert Harvey
    This occurred after a Trojan incident. We managed to get the Trojan cleaned off the computer, but now we can't Right click the desktop. We have tried changing HKCU/software/microsoft/windows/current version/policies/explorer/noviewcontextmenu in the registry, and group policy user configuration/administrative templates/windows explorer/remove windows explorers default context menu, but neither worked. How do we reenable the right-click menu for the desktop? (it works everywhere else)

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  • Monitoring Your Servers

    - by Grant Fritchey
    If you are the DBA in a large scale enterprise, you’re probably already monitoring your servers for up-time and performance. But if you work for a medium-sized business, a small shop, or even a one-man operation, chances are pretty good that you’re not doing that sort of monitoring. You know that you’re supposed to be doing it, but other things, more important at-the-moment things, keep getting in the way. After all, which is more important, some monitoring or backup testing?  Backup testing, of course. Monitoring is frequently one of those things that you do when can get around to it.  Well, as you can see at the right, I have your round tuit ready to go. What if I told you that you could get monitoring on your servers for up-time, job completion, performance, all the standard stuff? And what if I told you that you wouldn’t need to install and configure another server in your environment to get it done? And what if I told you that you’d be able to set up and customize your alerts so you could know if your server was offline or a drive was full? Almost nothing for you to do, and you’ll have a full-blown monitoring process. Sounds to good to be true doesn’t it? Well, it’s coming. We’re creating an online, remote, monitoring system here at Red Gate. You’ll be able to use our SQL Monitor tool (which you can see here, monitoring SQL Server Central in real time) to keep track of your systems, but without having to set up a server and a database for storing the information collected. Instead, we’re taking advantage of services available through the internet to enable collection and storage of this information remotely, off your systems. All you have to do is install a piece of software that will communicate between our service and your servers and you’ll be off and running. It’s that easy. Before you get too excited, let me break the news that this is the near future I’m talking about. We’re setting up the program and there’s a sign-up you can use to get in on the initial tests.

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  • Adding Actions to a Cube in SQL Server Analysis Services 2008

    Actions are powerful way of extending the value of SSAS cubes for the end user. They can click on a cube or portion of a cube to start an application with the selected item as a parameter, or to retrieve information about the selected item. Actions haven't been well-documented until now; Robert Sheldon once more makes everything clear.

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  • Nagios SSH remote checks and WMI Check

    - by jenglee
    I have install Nagios Core and I am using WMI Checks for Windows and Created a script to execute remote commands through ssh on my Linux machines. When Installing Nagios there is an option to run NsClient++, but I went with the WMI Checks because it is agent less. What are the advantages of using NsClient++ for Nagios? Also would calling too many commands through WMI or SSH hinder the performance of the remote host?

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