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  • how does server communication work in a flash game with a php backend

    - by Tim Rogers
    I am trying to create a browser game using actionscript/flash. Currently, I'm trying to understand how I would go about creating a back-end which interfaced with my MySQL database. As far as I understand, If I create a php file on a webserver called test.php and then navigate to a webpage hosted on the server eg. www.example.com/test, the php script will run and display the result in my browser. This would use http. Is this how communication between client and server usually works in a flash game? for example, if the game needed to query the db. Would actionscript have to essentially invoke the url of the php script that would execute the query? it could then parse the data and use it. If this is the case, then is JSON considered a good way to transfer data over http?

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  • New Book: "Systems Performance: Enterprise and the Cloud"

    - by uwes
    Brendan Gregg, former Solaris kernel engineer at Sun published his new book "Systems Performance: Enterprise and the Cloud" in October. The book is a modern, very comprehensive guide to general system performance principles and practices, as well as a highly detailed reference for specific UNIX and Linux observability tools used to examine and diagnose operating system behaviour. Read a more detailed abstract and review on Harry J Foxwell's Blog entry "Brendan Gregg's "Systems Performance: Enterprise and the Cloud"

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  • WebLogic Server internal server error [migrated]

    - by Abhinav Pandey
    When I deployed a project in Apache Tomcat 6.0 it is working fine. When I deployed a same project in WebLogic Server 10.3 it's showing an error: Error 500--Internal Server Error javax.servlet.ServletException: [HTTP:101249][weblogic.servlet.internal.WebAppServletContext@ae43b8 - appName: '_appsdir_ab_dir', name: 'ab', context-path: '/ab', spec-version: 'null']: Servlet class FirstServlet for servlet FirstServlet could not be loaded because the requested class was not found in the classpath . java.lang.UnsupportedClassVersionError: FirstServlet : Unsupported major.minor version 51.0.

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  • World of Warcraft like C++/C# server (highload)

    - by Edward83
    I know it is very big topic and maybe my question is very beaten, but I'm interesting of basics how to write highload server for UDP/TCP client-server communications in MMO-like game on C++/C#? I mean what logic of retrieving hundreds and thousands packages at the same time and sending updates to clients? Please advice me with architecture solutions, your experience, ready-to-use libraries. Maybe you know some interesting details how WoW servers work. Thank you! Edit: my question is about developing, not hardware/software tools;

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  • Load balancing on Ubuntu Server

    - by SabreWolfy
    I have Ubuntu 10.04.4 server (32-bit) installed on a headless quad-core machine with 2GB RAM. I'm running a command-line analysis which is analyzing a large amount of data, but which does not require a large amount of RAM. The tool does not provide any multi-threading, so the CPU load is sitting at 1.00 (or sometimes just a little over). I ran top and pressed 1 to see the load on each of the cores and noticed that "Cpu1" is always running at 100%. I thought that the load would be distributed between the cores, rather than loading one core all the time. I'm sure I've seen this load-balancing behaviour before in Ubuntu or Debian Desktop versions. Why would the Server edition work differently? The analysis will likely take several hours to run, so loading one core at 100% for many hours while the other 3 remain idle is surely not the best approach?

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  • Performance Improvements: Caching

    Caching can greatly improve performance but it can also lull you into a false sense of security. In some cases it can even make the performance worse. If you haven't already, then now is the time to learn the issues and limitations of caching so that you can truly improve performance.

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  • Performance Improvements: Caching

    Caching can greatly improve performance but it can also lull you into a false sense of security. In some cases it can even make the performance worse. If you haven't already, then now is the time to learn the issues and limitations of caching so that you can truly improve performance.

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  • Seamlessly Authenticate with a Secondary Active Directory Server (when primary is down)

    - by LonnieBest
    How do you get workstations to (seamlessly) authenticate with a secondary Active Directory server when the primary one is down? Background: I added a secondary Active Directory server to a company's network, hoping that it would do authentication in the event that the primary Active Directory server was down. Although, the Secondary Active Directory server seems to be replicating correctly, authentication doesn't occur while rebooting the primary Active Directory server. Do I have a misunderstanding regarding the role of a secondary Active Directory server, or are there additional settings I must set to get the workstations to authenticate with it when the primary is down?

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  • Enzo Backup for SQL Azure Beta Released!

    - by ScottKlein
    Blue Syntax is happy to announce the release of their SQL Azure database backup product! Enzo Backup for SQL Azure offers unparalleled backup and restored functionlity and flexibility of a SQL Azure database. You can download the beta release here: http://www.bluesyntax.net/backup.aspx With Enzo Backup for SQL Azure, you can: Create a backup blob, or a backup file from a SQL Azure database Restore a SQL Azure database from a backup blob, or a backup file Perform limited backup and restore of SQL Server databases (see details) Run backups entirely in the cloud using a remote agent Backup a single schema of a database Restore specific tables only Copy backup devices from on-premise to the cloud Use a command-line utility to perform backup operations Perform transactionally consistent backups for SQL Azure Please download it and provide us your feed back!

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  • Install Java on Ubuntu server (Parallels Plesk)

    - by atMaarten
    I want to install Java to my server so I can use PHP shell_exec to compile Java online. So I'm trying to install Java on my webserver (Ubuntu - Parallels Plesk). I logged in to the server with PuTTY and tried some commands like: sudo apt-get install openjdk-6-jre or sudo apt-get install oracle-java7-installer But than I get error's like: Package drweb-bases must be reinstalled, but there can be no archive found. I tried to uninstall drweb-bases, reinstall, no matter what. I still get that error. What you I need to do? I am doing it completly wrong? Am I not destroying my webserver? There is not much to find on this topic on Google.

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  • Server 2012R2 – PowerShell Web Access

    - by Waclaw Chrabaszcz
    Originally posted on: http://geekswithblogs.net/Wchrabaszcz/archive/2014/05/17/server-2012r2--powershell-web-access.aspxHaha … Sometimes I'm joking that there is nothing worse than Linux fanboi imprisoned in Windows engineer's body. Maybe someday I will start blogging about my noob's experiences. However let's stick to the point. Sometimes the easiest solutions are the best. After couple of tries how to reach left pocket using right hand I'm going to follow easy path. Today's plan is very easy, I'm going to take advantage of Server 2012 and install Web gateway to PowerShell console. After that I would be able execute PoSH from any device including Linux. Install-WindowsFeature –Name WindowsPowerShellWebAccess –IncludeManagementToolsInstall-PswaWebApplication –UseTestCertificateAdd-PswaAuthorizationRule –UserName * -ComputerName * -ConfigurationName *  Let's test it …

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  • Monitoring Visual Studio 2010 Performance Problems

    - by TATWORTH
    At http://visualstudiogallery.msdn.microsoft.com/fa85b17d-3df2-49b1-bee6-71527ffef441, Microsoft have provided a tool for Visual Studio to provide reports on Visual Studio 2010 performance problems. The use of it has been discussed at http://blogs.msdn.com/b/visualstudio/archive/2011/05/02/perfwatson.aspx as follows: "Would you like Visual Studio 2010 to be even faster? Would you like any performance issue you see to be  reported automatically without any hassle? Well now you can, with the new Visual Studio PerfWatson extension! Install this extension and help us deliver a faster Visual Studio experience. We’re constantly working to improve the performance of Visual Studio and take feedback about it very seriously. Our investigations into these issues have found that there are a variety of scenarios where a long running task can cause the UI thread to hang or become unresponsive. Visual Studio PerfWatson is a low overhead telemetry system that helps us capture these instances of UI unresponsiveness and report them back to Microsoft automatically and anonymously. We then use this data to drive performance improvements that make Visual Studio faster." Now instead of complaining you too can help Microsoft locate and fix performance problems with Visual Studio 2010. The requirements are: "Following are the pre-requisites for installing Visual Studio PerfWatson: Windows Vista/2008/2008 R2/7 (Note: PerfWatson is not supported for Windows XP) Visual Studio 2010 SP1 (Professional, Premium, or Ultimate)"

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  • How should I practice web server administration?

    - by Astyanax
    Security students can practice their skills with software like OWASP's webgoat or something similar to "hackthissite". Students interested in Operating Systems can study MINIX and PintOS, write shell scripts or study POSIX system calls. What would be the best course of action in order to practice Server Administration? Is there any such software/resource available, teaching you such skills with small lessons, or it is totally up to you? I've practiced live FreeBSD server administration and management of VMs (CentOS, Gentoo, Debian) under VirtualBox, but I always feel that this isn't enough and I must push myself harder. So, what would you recommend? What has worked for you?

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  • Red Samurai Performance Audit Tool – OOW 2013 release (v 1.1)

    - by JuergenKress
    We are running our Red Samurai Performance Audit tool and monitoring ADF performance in various projects already for about one year and the half. It helps us a lot to understand ADF performance bottlenecks and tune slow ADF BC View Objects or optimise large ADF BC fetches from DB. There is special update implemented for OOW'13 - advanced ADF BC statistics are collected directly from your application ADF BC runtime and later displayed as graphical information in the dashboard. I will be attending OOW'13 in San Francisco, feel free to stop me and ask about this tool - I will be happy to give it away and explain how to use it in your project. Original audit screen with ADF BC performance issues, this is part of our Audit console application: Audit console v1.1 is improved with one more tab - Statistics. This tab displays all SQL Selects statements produced by ADF BC over time, logged users, AM access load distribution and number of AM activations along with user sessions. Available graphs: Daily Queries  - total number of SQL selects per day Hourly Queries - Last 48 Hours Logged Users - total number of user sessions per day SQL Selects per Application Module - workload per Application Module Number of Activations and User sessions - last 48 hours - displays stress load Read the complete article here. WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Wiki Technorati Tags: Red Samurai,ADF performance,WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress

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  • What does a media server need?

    - by DeaDSouL
    I want to buy a new PC to be used as a media server that streams HD movies, music to any wireless device on my network (laptop, desktop, TV, etc.). I was wondering about the PC hardware's specifications that I need to have so that it can work just fine? (It will be wireless) Is there any tutorial showing how it could be done? And the security - how can I secure it? As well as I need it to to host my emails. I mean I have many emails. And sometimes I'm using desktop, sometimes laptop.. so is it possible to make the server store a copy of my emails, attachments, all sent items (whether they were from desktop or laptop)?

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  • SCOM, 90 Days In, I

    - by merrillaldrich
    At my office we’re about 90 days into our implementation of System Center Operations Manager for Windows Server and SQL Server monitoring. All in all it’s been a good experience, and I’m really excited to have access to this tool. I’ve logged a fair number of years as a DBA on products like Idera’s SQL Diagnostic Manager and Quest Spotlight on SQL Server Enterprise (and “roll-your-own” solutions) in smaller environments, and liked them, but they always, in my experience, struggled with really large...(read more)

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  • Windows Server 2008 R2 Firewall - Interface specific rules

    - by Mehmet Ergut
    I'm trying to define per interface rules, much like it was in Server 2003. We will be replacing our old 2003 server with a new 2008 R2 server. The server runs IIS and SQL Server. It's a dedicated server at the hosting company. We use a OpenVPN connection from the office to access SQL server, RDesktop, FTP and other administrative services. Only http and ssh is listening on the public interface. On the old server running 2003, I was able to define global rules for http and ssh, and allow other services only on the vpn interface. I can't find a way to do the same on 2008 R2. I understand that there is the Network Location Awareness service, firewall rules are applied according to the current network location. But I don't understand the purpose of this on a server. The only close solution I found is to set the scope on the firewall rule and restrict remote ip addresses to the private subnet of the office. But the ports will still be listening on the public interface. So how can I restrict a firewall rule to the connections coming from the vpn interface ? A note on this page states that scoping a rule to an interface does not exist anymore: In earlier versions of Windows, many of these command accepted a parameter called interface. This parameter is not supported in the firewall context in Windows Vista or later versions of Windows. I can't believe that they simply decided to remove a core firewall functionality that every firewall has. There must be a way to restrict a rule to an interface. Any ideas ? I'm still unable to find an adequate solution to my problem. So for now, my workaround is this: Administrative services listen on VPN IP address Firewall rules restrict the scope to the local IP address of VPN Public services listen on all interfaces, no scope restriction on firewall rules This is not optimal, if I change the IP address of the VPN, I need to edit the firewall rules too. It won't be the case if the rules were bound to the interface.

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  • Ubuntu Server 11.04 update 404 errors

    - by Ryan
    I am an ubuntu amateur trying to set up an ubuntu 11.04 server on a tower. I want to install things like ssh client/ server and gksudo on it but I get errors when trying to do so. I tried to update, but I get 404 errors. I have already tried to install fix404 but it seems there is no "app-add" command... After many hours of failure, I turn to you, wise people of the internet. You are my last hope. help?

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  • Unable to map to web folder using WebDAV client on Windows Server 2008 R2

    - by user74989
    Hello, I have a client running Windows Server 2008 R2 on several servers. One of the servers is also running SharePoint 3.0 and my client has created a web folder to map to. I can map to the web folder from all Server 2008 R2 boxes that have the WebDAV client (part of Desktop Experience feature) installed, except for the server the folder resides on. When I attempt to map to the web folder on the server which the folder resides, I am repeatedly prompted to enter my credentials. I am using the same account that I used to map the web folder on the other servers. I have also tried mapping from the command line and receive 'Access Denied' What may be causing the problem? I would think that if I can map to the drive from one server, I should be able to map the drive from the rest as long as the WebDAV client is installed, especially on the server where the folder is located. Jesse

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  • The World of SQL Database Deployment

    - by GGBlogger
    In my early development days, I used Microsoft Access for building databases. It made things easy since I only needed to package the database with the installation package so my clients would have access to it. When we began the development of a new package in Visual Studio .NET I decided to use SQL Server Express. It was free and provided good tools - also free. I thought it was a tremendous idea until it came time to distribute our new software! What a surprise. The nightmare Ah, the choices! Detach the database and have the client reattach it to a newly installed – oh wait. FIRST my new client needs to download and install SQL Server Express with SQL Server Management Studio. That’s not a great thing, but it is one more nightmare step for users who may have other versions of SQL installed. Then the question became – do we detach and reattach or do we do a backup. It was too late (bad planning) to revert to Microsoft Access but we badly needed a simple way to package and distribute both the database AND sample contents. Red Gate to the rescue It took me a while to find an answer but I did find it in a package called SQL Packager sold by a relatively unpublicized company in England called Red Gate. They call their products “ingeniously simple” and I must agree with that description. With SQL Packager you point to the database (more in a minute) you want to distribute. A few mouse clicks and dialogs and you have an executable file that you can ship virtually anywhere and virtually any way which, when run, installs the database on your destination SQL Server instance! It really is that simple. Easier to show than tell Let’s explore a hypothetical case. Let’s say you have a local SQL database of customers and you have decided you want to share it with your subsidiaries or partners. Here is the underlying screen you will see on starting SQL Packager. There are a bunch of possibilities here but I’m going to keep this relatively simple. At this point I simply want to illustrate the simplicity of generating an executable to deliver your database. You will notice that you can set up a new package, edit an existing package or change a bunch of options. Start SQL packager And the following is the default dialog you get on startup. In the next dialog, I’ve selected the Server and Database. I’ve also selected Windows Authentication. Pressing Next causes SQL Packager to run a number of checks and produce a report. Now you’re given a comprehensive list of what is going to be packaged and you’re allowed to change it if you desire. I’ve never made any changes here so I can’t really make any suggestions. The just illustrates the comprehensive nature of so many Red Gate products including this one. Clicking Next gives you still further options. SQL Packager then works its magic and shows you a dialog with the results. Packager then gives you a dialog of the scripts it has generated. The capture above only shows 1 of 4 tabs. Finally pressing Next gives you the option to generate a .NET executable of a C# project. I’ve only generated an executable so I’m not in a position to tell you what the C# project looks like. That may be the subject of further discussions. You can rename the package and tell SQL Packager where to save it. I’ve skipped a lot but this will serve to illustrate the comprehensive (and ingenious) things Red Gate does. All in all, it’s a superb way to distribute populated SQL databases. Oh – we’ll save running the resulting executable for later also but believe me it’s insanely simple.

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  • Upload ICS (calandar) file to my server

    - by IEnumerable
    I want to upload my ICS file to my server, well this is the easy part. What I really want is to be able to share this *.ics file with 2-3 people so they can edit. I have currently uploaded the file on the www/ (root) mydomain.com.au/myfile.ics of my server and added it to my Email/Cal client. Was all looking ok until I tried to save changes. Can someone please direct me to some documentation on how I do this properly. The easy solution would be to upload to google, but I would rather learn how to manage the file myself. Thank you

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  • PAL–Performance Analysis of Logs

    - by GavinPayneUK
    I was doing some research earlier this week on SQL Server related troubleshooting tools and was surprised I’d forgotten about Microsoft’s PAL tool – Performance Analysis of Logs. PAL is a free PowerShell UI based tool from Microsoft that creates a perfmon template which can then be used to capture counters most relevant to a high-level performance review PAL will them give for specific Microsoft server deployments, SQL Server being one of them.  Everyone knows what perfmon does, probably too...(read more)

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  • Calculating RAM Performance? Example: DDR3-2133 CL9-11-10-28 1.65V vs DDR3-1600 CL10-10-10-30 1.5V

    - by user1131467
    How do you calculate the relative performance of PC RAM? For example, what is the relative performance of the following: G.Skill Ripjaws Z 8 x 4GB Kit, DDR3-2133, [email protected] G.Skill Ripjaws Z 4 x 8GB Kit, DDR3-1600, [email protected] If it's relevant, when they are used in a top of the line ASUS Rampage IV Extreme motherboard and Intel i7 3960X? By performance, I mean relative: read latency write latency read bandwidth write bandwidth Please include working. (I mean how did you arrive at the figures based on timing and DDR3-speed)

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