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  • Free ebook: Troubleshooting SQL Server: A Guide for the Accidental DBA

    We spend much of our working life helping solve SQL Server-related performance problems, hands-on, during consulting, or on online forums. We've seen a few weird-and-wonderful issues but, mainly, it’s the same problems and misconceptions time-and-again. This is our attempt to describe, diagnose, and solve the most common problems with SQL Server 2005, 2008, and 2008 R2. And it's free. "It really helped us isolate where we were experiencing a bottleneck"- John Q Martin, SQL Server DBA. Get started with SQL Monitor today to solve tricky performance problems - download a free trial

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  • What are the parameters that let businesses choose .NET or Java over other languages/frameworks? [on hold]

    - by Othman
    Some of the biggest enterprise applications such as HR software, Sales and ERP, are written in .NET or Java. Also, Governments online solutions such as paying parking fines, and universities courses registration systems are all in .NET or Java. On the other hand, Facebook, Google and Wikipedia, are not using .NET or Java so much (Google uses at least both Java and Python). Twitter also was using Ruby for a long time, as well as Python. These websites work on much more data and at larger scales in terms of users and performance than any enterprise applications, yet still these companies have chosen a different path. What are the parameters driving such decisions? Note This question is not about why do you prefer x over y! or why those people are using this. The question is primarily asking about the parameters that makes Java Or .NET becomes better suite in enterprise applications based on Performance, Reliability, Scalability etc.

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  • What techniques can I use to render very large numbers of objects more efficiently in OpenGL?

    - by Luke
    You can think of my application as drawing a very large ball-and-stick diagram (or graph). At times, this graph can get very large, where the number of elements even outnumbers the pixels on the screen. Currently I am simply passing all of my textures (as GL_POINTS) and lines to the graphics card using VBO's. When the number of elements outnumbers the number of pixels, is this the most efficient way to do this? Or should I do some calculations on the CPU side before handing everything over to the GPU? If it matters, I do use GL_DEPTH_TEST and GL_ALPHA_TEST. I do some alpha blending, but probably not enough to make a huge performance difference. My scene can be static at times, but the user has control over a typical arc-ball camera and can pan, rotate, or zoom. It is during these operations that performance degradation is noticeable.

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  • Database Insider - July 2012 issue

    - by Javier Puerta
    The July issue of the Database Insider newsletter is now available. (Full newsletter here) INFORMATION INDEPTH NEWSLETTERDatabase Insider Edition - July 2012 Optimize Your Communications Applications on Oracle ExadataThe communications industry is experiencing explosive growth, which means that high-performing, scalable, and cost-effective solutions are critical for success. Learn more by accessing white papers, success stories, product information, videos, podcasts, and more. Register now. Oracle Exadata Enables Neuralitic's SevenFlow Application ImprovementsImproves application performance 3x and compression rate/scalability 10x. ElectraCard Services Runs Oracle Exadata on Oracle LinuxAchieves processing speeds greater than 12,000 TPS and increases performance 2x. Read full newsletter here

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  • What is the primary use of Vertex Buffer Objects?

    - by sensae
    From what I've read, it seems VBOs are purely for performance. I'm working on a very rudimentary learning project in lwjgl and I'm just trying to figure out what more advanced features of the library I should be delving into, and what their use is. My understanding is that VBOs allow a person to keep vertexes in VRAM while they aren't currently being drawn in a scene. In my case, I'm just drawing quads and performance probably isn't a concern at all, but I'm trying to piece together what's happening under the hood. If I'm drawing quads directly, I'm drawing from the CPU memory, correct? Also, if I'm not doing any checks for visibility, does that mean I'm rendering absolutely everything in the "scene", regardless of whether its in view? Are VBOs a way to store objects and only render what's needed?

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  • Port flash game to native android

    - by wirate
    Alright here is the problem: the creators of a quite popular flash-based game have asked me to port their game to Android. They are not interested in any other platforms so we don't need to be worrying about iOS or PC. They want the best performance on just Android (I guess that's the point of porting a flash-based game. They could have just went with it) They found Unity 'slow'. How would the performance (on android) of other engines compare? Are they expecting too much i.e. finding Unity slow? I am in favor of Unity since development is a little easier with more things being visual (I am not experienced as you might have guessed). This would be an example of the type of game I am to port Thanks!

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  • Get Compiz working on x1300 ati

    - by wdkrnls
    Hi, I have Ubuntu 10.10 installed on a thinkpad T60 with an ati mobile x1300. Ubuntu isn't loading any proprietary drivers and compiz doesn't work. A google search turned up nothing. Sure, some people reported "bad performance", but I'm not getting any "performance" with compiz and these post were all for previous editions. I'm new to messing with ati drivers. Is there a way to make sure xorg-video-ati is loaded? Do I have to add any voodoo lines somewhere in /etc/X11/? Did anyone else have this problem? Thanks for your help!

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  • Database Insider - November 2012 issue

    - by Javier Puerta
    The November issue of the Database Insider newsletter is now available. (Full newsletter here) Mark Hurd: Oracle Database Wrap-up from Oracle OpenWorld 2012 Oracle executives kicked off Oracle OpenWorld 2012, discussing the needs of customers, the brand-new Oracle Exadata Database Machine X3, and the latest Oracle Database innovations. (Read More) Webcast: Introduction to Oracle Exadata Database Machine X3 Oracle’s next-generation database machine, Oracle Exadata X3, combines massive memory and low-cost disks to deliver the highest performance at the lowest cost. Available in an eight-rack configuration, it allows you to start small and grow. Webcast: SAP Applications Run Better on Oracle Exadata Find out why a growing number of SAP application customers are turning to Oracle Exadata Database Machine for better performance, better productivity—and big savings. 

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  • Better php framework for shared hosting

    - by ravz
    I need to develop an app for booking appointments. This is gonna be hosted in a shared server. So performance is the most important thing. I have used symfony2. I quite liked the framework. But seems to be heavy. Which framework would suit me considering my requirements? I have shortlisted three frameworks yii, symfony2 and ZF2. I am not asking which framework is better. All the three are good frameworks. I want to know which will suit my requirements. My first priority would be performance (I will be using AJAX wherever possible), second would be maintenance and development time and third community support. Or should I use my own handlers to separate views and logic and just use raw php?

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  • Color based collision detection

    - by user1486826
    I am making a game where you fly a ship around some randomly generated planets. Since I am using a for loop to draw over 5000 planets, using the rectangle class or an oval-type class for this is not an option, since creating many objects will severely affect performance. Bitmasking each planet will likely result in performance issues too, so the only candidate is color based collision detection, because I don't need to apply some sort of object to everything I want to check for collisions. Is any way to check the perimeter around the ship for a certain color?

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  • Producing JSON Documents from SQL Server queries via TSQL

    Although SQL Server supports XML well, XML's little cousin JSON gets no love. This is frustrating now that JSON is in so much demand. Maybe, Phil Factor suggests, it is possible to leverage all that XML, and XPath, goodness in SQL Server to produce JSON in a versatile way from SQL Queries? Yes, it so happens that there are plenty of alternatives. FREE eBook – "45 Database Performance Tips for Developers"Improve your database performance with 45 tips from SQL Server MVPs and industry experts. Get the eBook here.

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  • using PixelBender to double the size of a bitmap

    - by jedierikb
    I have a performance question about pixel bender. I want to enlarge many BitmapData (double their size into new BitmapData). I was doing this with as3, but wanted to use pixel bender to get better performance. On my machines, I get great comparative performance out of many pixel bender demonstrations. To my surprise (or bad coding / understanding), I am getting much worse performance out of pixel bender -- 2 seconds to do 3000 scalings vs .5 seconds! I expected to get at least the same performance as as3. What am I doing wrong? I got the straightforward pixel bender code here (and it is included below for easy reference). package { import aCore.aUtil.timingUtils; import flash.display.BitmapData; import flash.display.Shader; import flash.display.ShaderJob; import flash.display.Sprite; import flash.display.StageAlign; import flash.display.StageScaleMode; import flash.events.Event; import flash.geom.Matrix; public class flashFlash extends Sprite { [Embed ( source="pixelbender/bilinearresample.pbj", mimeType="application/octet-stream" ) ] private static var BilinearScaling:Class; public function flashFlash( ):void { stage.align = StageAlign.TOP_LEFT; stage.scaleMode = StageScaleMode.NO_SCALE; addEventListener( Event.ENTER_FRAME, efCb, false, 0, true ); } private function efCb( evt:Event ):void { removeEventListener( Event.ENTER_FRAME, efCb, false ); traceTime( "init" ); var srcBmd:BitmapData = new BitmapData( 80, 120, false, 0 ); var destBmd:BitmapData = new BitmapData( 160, 240, false, 0 ); var mx:Matrix = new Matrix( ); mx.scale( 2, 2 ); for (var i:uint = 0; i < 3000; i++) { destBmd.draw( srcBmd, mx ); } traceTime( "scaled with as3" ); // create and configure a Shader object var shader:Shader = new Shader( ); shader.byteCode = new BilinearScaling( ); shader.data.scale.value = [2]; shader.data.src.input = srcBmd; for (var j:uint = 0; j < 3000; j++) { var shaderJob:ShaderJob = new ShaderJob( ); shaderJob.shader = shader; shaderJob.target = destBmd; shaderJob.start( true ); } traceTime( "scaled with pixel bender bilinearresample.pbj" ); } private static var _lastTraceTime:Number = new Date().getTime(); public static function traceTime( note:String ):Number { var nowTime:Number = new Date().getTime(); var diff:Number = (nowTime-_lastTraceTime); trace( "[t" + diff + "] " + note ); _lastTraceTime = nowTime; return diff; } } } And the pixel bender code: <languageVersion : 1.0;> kernel BilinearResample < namespace : "com.brooksandrus.pixelbender"; vendor : "Brooks Andrus"; version : 1; description : "Resizes an image using bilinear resampling. Constrains aspect ratio - divide Math.max( input.width / output.width, input.height / output.height ) and pass in to the scale parameter"; > { parameter float scale < minValue: 0.0; maxValue: 1000.0; defaultValue: 1.0; >; input image4 src; output pixel4 dst; void evaluatePixel() { // scale should be Math.max( src.width / output.width, src.height / output.height ) dst = sampleLinear( src, outCoord() * scale ); // bilinear scaling } }

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  • WebSphere Application Server EJB Optimization

    - by Chris Aldrich
    We are working on developing a Java EE based application. Our application is Java 1.5 compatible and will be deployed to WAS ND 6.1.0.21 with EBJ 3.0 and Web Services feature packs. The configuration is currently one cell with two clusters. Each cluster will have two nodes. Our application, or our system, as I should rather say, comes in two or three parts. Part 1: An ear deployed to one cluster that contains 3rd party vendor code combined with customization code. Their code is EJB 2.0 compliant and has a lot of Remote Home interfaces. Part 2: An ear deployed to the same cluster as the first ear. This ear contains EBJ 3's that make calls into the EJB 2's supplied by the vendor and the custom code. These EJB 3's are used by the JSF UI also packaged with the EAR, and some of them are also exposed as web services (JAX-WS 2.0 with SOAP 1.2 compliance) for other clients. Part 3: There may be other services that do not depend on our vendor/custom code app. These services will be EJB 3.0's and web services that are deployed to the other cluster. Per a recommendation from some IBM staff on site here, communication between nodes in a cluster can be EJB RMI. But if we are going across clusters and/or other cells, then the communication should be web services. That said, some of us are wondering about performance and optimizing communication for speed of our applications that will use our web services and EJB's. Right now most EJB's are exposed as remote. (and our vendor set theirs up that way, rather than also exposing local home interfaces). We are wondering if WAS does any optimizations between apps in the same node/cluster node space. If two apps are installed in the same area and they call each other via remote home interface, is WAS smart enough to make it a local home interface call? Are their other optimization techniques? Should we consider them? Should we not? What are the costs/benefits? Here is the question from one of our team members as sent in their email: The question is: Supposing we develop our EJBs as remote EJBs, where our UI controller code is talking to our EXT java services via EJB3...what are our options for performance optimization when both the EJB server and client are running in the same container? As one point of reference, google has given me some oooooold websphere performance tuning documentation from 2000 that explains a tuning configuration you can set to enable Call By Reference for EJB communication when they're in the same application server JVM. It states the following: Because EJBs are inherently location independent, they use a remote programming model. Method parameters and return values are serialized over RMI-IIOP and returned by value. This is the intrinsic RMI "Call By Value" model. WebSphere provides the "No Local Copies" performance optimization for running EJBs and clients (typically servlets) in the same application server JVM. The "No Local Copies" option uses "Call By Reference" and does not create local proxies for called objects when both the client and the remote object are in the same process. Depending on your workload, this can result in a significant overhead savings. Configure "No Local Copies" by adding the following two command line parameters to the application server JVM: * -Djavax.rmi.CORBA.UtilClass=com.ibm.CORBA.iiop.Util * -Dcom.ibm.CORBA.iiop.noLocalCopies=true CAUTION: The "No Local Copies" configuration option improves performance by changing "Call By Value" to "Call By Reference" for clients and EJBs in the same JVM. One side effect of this is that the Java object derived (non-primitive) method parameters can actually be changed by the called enterprise bean. Consider Figure 16a: Also, we will also be using Process Server 6.2 and WESB 6.2 as well in the future. Any ideas? recommendations? Thanks

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