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• What's difference between primitive and wrapper class in JPA (Hibernate) column mappings?

  - by Michael Lu

  For instance, there’s a integer column in a database table. Then in java model, it can be mapped both as primitive int and Integer. My question is what's difference between the int and Integer in this case? And performance concern? Thanks!

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• WCF named pipes service settings

  - by user137348

  Is it worth to set the service with ConcurrencyMode.Multiple and InstanceContextMode.Single attributes to save some performance when using named pipes ? I mean when I do so I have to bother with multithreading issues.

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• Why might the Large Object Heap grow rather than throw an exception?

  - by Unsliced

  In a previous question I asked possible programatic ways of maximising the largest block allocatable on the LOH. I'm still seeing the problems, but now I'm trying to get my head around why the LOH seems to grow and shrink in size, yet I'm still seeing OutOfMemoryExceptions that tally with what others have reported as being due to LOH fragmentation. Why might one call to, for example, StringBuilder.EnsureCapacity throw an OutOfMemoryException for me, but another call from somewhere else result in the LOH expanding in size (according to the performance counters, it is growing and shrinking)?

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• PostgreSQL or MS SQL Server?

  - by mmiika

  I'm considering using PostgreSQL with a .Net web app. Basically 3 reasons: Mature Geo Queries Small footprint + Linux Price I'm wondering a bit about tools though, SQL Server Profiler and query plans and performance monitors have been helpful. How is this world with Postgres? Some other things I should consider? Edit: Will most likely use NHibernate as ORM

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• How to make graph from perf4j log file?

  - by Ankita

  I have used perf4j to calulate the performance of the process. Now I want to make the graph for that file. Is it possible to make it without using google API or any other metohd that can be used Thank You

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• In SQL Server changing column varchar(255) nvarchar

  - by JD

  Hi, I am using SQL server 2008 express and some of our columns are defined as varchar(255). Should I convert these columns to NvarChar(255) or nvarchar(max)? The reason I ask is I read that nvarchar(255) for unicode characters would actually store 1/2 the number of characters (since unicode characters are 2 bytes) whereas 255 with varchar() would allow me to store 255 characters (or is it 255 - 2 for the offset). Would there be any performance hits using nvarchar(max)? JDs

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• Is there anyway for a win2k8 scheduled task to have normal priority IO?

  - by Jason Mathison

  I have a scheduled task that is very IO intensive (deleting hundreds of thousands of files). For disk space reasons, this job has to be performed reasonably quickly. On win2k8, scheduled tasks always have a low IO priority. Raising the priority of the process did not change the IO priority. Is there any way to get a scheduled task to have a normal IO priority?

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• Push cookie notification

  - by Felipe Barreiros

  Hello everyone, The question that I have is very basic: Is there a way to inform the web browser that the content of the cookie has changed? I don't want to keep looking at the file and check if it has been updated because it'll cause performance degree on my app. Thanks in advance!

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• jQuery and function scope

  - by Jason

  Is this: ($.fn.myFunc = function() { var Dennis = function() { /*code */ } $('#Element').click(Dennis); })(); equivalent to: ($.fn.myFunc = function() { $('#Element').click(function() { /*code */ }); })(); If not, can someone please explain the difference, and suggest the better route to take for both performance, function reuse and clarity of reading. Thanks!

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• Need some guidelines on iPad animation programming

  - by thomasvsundert

  Hi, I'm creating an interactive e-book for the iPad. This book will contain multiple pages that will consist of a lot of animations (frame and motion animations), transitions,... I was wondering what my development options are, should I use OpenGL, Quartz,...? I've use UIImageView.animationImages before and found that it had really bad performance. What's the best way to draw frame based animations? Does anybody have some good pointers to resources on this? thanks in advance, Thomas

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• What are the Drawbacks of large binaries?

  - by sum1stolemyname

  I ask since a project I work on generates a single, monolithic DLL of about 50 MB size. Does a large library like this one impede performance, or can it bring other gotchas?

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• How to run multiple versions of Symfony PHP Framework

  - by Jon Winstanley

  I have several web projects built with Symfony v1.0, but I am excited by the new features in Symfony version 1.4 (Improved security, native email support and improved performance). How can I continue to develop my 1.0 projects but also create a testing environment for version 1.4?

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• how do you monitor your lamp server?

  - by ajsie

  i wonder how one can monitor a lamp server (ubuntu) on production. are there any standard tools for this to watch the server performance/load in realtime via the browser? how mysql, linux, apache etc are doing... what is best practice regarding this? any tutorials would be great. thanks!

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• restoring outlook express passwords and settings from a second drive

  - by adrin

  My mom's computer motherboard ceased to work and instead of replacing it I bought a newer computer. I'd like to restore her mail account / outlook express identities from an old disk drive that is now connected to new computer... is it possible? I know how to restore old mails, but what about paasswords and pop3/smtp settings?

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• How to specifically identify server issues from a load test result (using LoadRunner)?

  - by Bash

  How do you isolate a performance issue to a specific component of the application infrastructure? Specifically, are there distinct markers in the result logs that distinguish between bottlenecks at web, application and/or database server levels? I was asked this question in an interview and went blank on it. Seems this information is not available anywhere.

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• Generating exactly prime number with Java

  - by Viet

  Hi, I'm aware of the function BigInteger.probablePrime(int bitLength, Random rnd) that outputs probably prime number of any bit length. I want a REAL prime number in Java. Is there any FOSS library to do so with acceptable performance? Thanks in advance!

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• How can I find a Qt metaobject instance from a class name?

  - by axilmar

  Is there a way to find the QMetaObject instance of a class, given the class name? what I like to do is to load objects from disk, but for this to happen, I need a way to retrieve a QMetaObject instance using the name of a class, in order to use the QMetaObject to create an instance.

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• Best practices for caching results of JSP pages?

  - by Spines

  My application has an MVC structure. How should I structure my application to allow for maximum caching? Is it sufficient to only cache the model objects that are passed to the JSP views? Or will there be a significant performance boost from caching the results of the rendering of the JSP views too?

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• Does gcc's STL support rvalue reference already?

  - by Bear

  Hi I know Visual Studio 2010's STL has been rewritten to support rvalue reference to boost its performance a lot. I am curious that STL of gcc 4.4 (and above) does support it? Thanks.

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• Flash ActiveX: How to Load Movie from memory or resource or stream?

  - by yuku

  I'm embedding a Flash ActiveX control in my C++ app (Flash.ocx, Flash10a.ocx, etc depending on your Flash version). I can load an SWF file by calling LoadMovie(0, filename), but the file needs to physically reside in the disk. How to load the SWF from memory (or resource, or stream)? I'm sure there must be a way, because commercial solutions like f-in-box's feature Load flash movies from memory directly also uses Flash ActiveX control.

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• Good-looking Java Swing Look&Feel?

  - by eric

  I'm working on an open-source Java Web Start application, and I'd like to give it a consistent theme across platforms. Metal is totally ugly, and I'm not particularly happy with Substance (esp. performance). What are the best Swing Look&Feel options out there today?

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• JAXB unmarshal exclude specific element

  - by zigomir

  Hi everyone! I know for @XmlTransient annotation, but sometimes I need this element and in other use cases I really have to prevent it from unmarshaling, because it contains base64 text. So I need to exclude it because performance problems. Is there any way to dynamicly exclude one element from unmarshaling with JAXB?

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• pure as3 benefits to compiling with flex4 instead of flex3?

  - by jedierikb

  If I have a pure as3 project that I have been compiling with flex3 from mxmlc, is there any reason to switch to using the mxmlc with flex4? I can use all of the flash 10 language features like Vector, 3D, etc., so that is not a reason to switch (or is there something I can't do?). But maybe there is a performance boost? Or is the exact same compiling tool and the flex code base is the only difference?

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• VBScript - image to binary

  - by countnazgul

  Hi to all, i'm not a VB programmer but i need a vbscript that convert image file (from local disk) to be converted to binary data and the passed to webservice. I realize how to pass data to webservice but i can't find how to convert the image file to binary data. I spend a lot of time to find some kind of solution but with no luck. Can somebody help me? Thanks!

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• speed up wamp server + drupal on windows vista

  - by Andrew Welch

  Hi, My localhost performance with drupal six is pretty slow. I found a solution to add a # before the :: localhost line of the system32/etc/hosts file but this was something I had already done and didn't help much. does anyone know of any other optimisations that might work? tHanks Andy

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