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• Learning MySQL Query optimization

  - by recluze

  I've been doing web/desktop/server development for a while and have worked with many databases (mysql mostly). I've come to the point in my career when I need to have someone look at my queries because they're 'kind of slow'. I believe it's now time to start learning query optimization. While I know the basics of index and joins etc., I'm not familiar with how to use, say, the EXPLAIN output to improve performance of my queries. I have not been able to find any online material that starts with the basics and takes me to application. Getting a book is not an option right now so I'm looking for tips about how to proceed with this. I hope this question is general enough not to get closed.

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• Help with off-game tasks

  - by peoro

  I love writing video games for fun, and often do that. I noticed, anyway, that most of the times implementing the gameplay itself doesn't take too much time to me (maybe because I already did that plenty times and know what and how to do for most of the things), but when I try to implement off-game stuff I get lost. By off-game I mean what is not gameplay: menus, cutscenes between levels, world map to choose levels, saving and loading status, managing replays ... Only tried to write a few of these a few times, but always failed; that's why I never really completed and distributed a game. Are these common problems? And where should I start to do this? Where could I find some books/guides about such stuff?

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• software development tools or technology [closed]

  - by user1783508

  Are there any technology or tools in which I can do ; * software requirement documentation * software design documentation * software test documentation * uml feature ( use case , flow chart, sequence diagram etc. ) EDIT : I want a tools like Eclipse. To be more precise, I can start many project via using same tool/technology. ex : [-] project1 [-] requirement [-] design [-] test [-} project2 [-] requirement [-] design [-] test I can use uml properties in the same tool/technology. After right clicking on the document or as a separate toolbar, it is seen. add ;Uml diagram create use case create class diagram create sequence diagram create flow chart etc.

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• For asp.net mvc is this a three tiered solution?

  - by bbb

  I am a asp.net mvc programmer and if I want to start a project I do this: I make a class library named Model for my models. I make a class library named Infrastructure.Repository for database processes I make a class library named Application for business logic layer And finally I make a MVC project for the UI. But now some things are confusing me. Am I using 3-tier programming? If yes so what is n-tier programming and which one is better? If no so what is 3-tier programming? Some where I see that the tiers namings are DAL and BIZ. Which one is correct according to the naming convention?

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• What is w componet [duplicate]

  - by Tifa

  This question already has an answer here: What does the graphics card do with the fourth element of a vector as the final position? 3 answers What is the W component on graphics programming. I read a blog about opengl that says that w must be equal to either 0 or 1 here. But the book I am currently reading has put w component to more than 1 value. So im kinda confuse what does it really do. The book I am reading is OpenGL es a quick start guide.

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• Advise how to write a simple test for this javascript snippet?

  - by resting

  I'm trying to start unit testing (not using any testing frameworks) for my javascripts. Here's one example of it. var obj = {}; obj.disableBtn = function ($btn, style) { $btn.attr('disabled','disabled').addClass('disabled').removeClass(style); }; The use case is as such: obj.disableBtn($('.submit'), 'btn-blue'); What it does is simply add the disabled attribute, add the disabled class, and remove the btn-blue style. Please advise how would a typical test case look like in this case. I have a little knowledge on testing using assert(), but have no idea how to go about it when it involves verifying the result on HTML elements.

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• C# WPF to Embedded programming transition

  - by Cheltoonjr

  I've been learning C# .NET Framework for around 4-6 months (still starting) using some books, and have currently made my way up to Collections and Generics. I'll probably spend the next two months covering the rest up to LINQ and/or Garbage Collections. The thing is, I started to get interested in embedded systems and found out that you can use C# to code it through .NET MF, which mean I wouldn't have to learn C or C++. So, I would like to know if the knowledge I'll have by that time (2 months) will be enough to start working on Embedded (using C# .NET Micro Framework and Netduino) or I should probably see more about plain C# like Multithreading, async and other advanced features ? I want use embedded just as a hobby, at least by now, as I'll still have a long way through university. Although, I'll probably pick it as a career then. Thanks in advance!

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• Grub cannot boot Windows 7 loader entry on 3tb drive

  - by twicejr

  It fails and it says 'cannot find device'. It will work again if I reinstall Windows, and use something like EasyBCD. But I'd like grub as a loader only, can someone help me out here? My system has a regular BIOS (p35-ds4 mainboard) so no UEFI support. Previously ran Windows 8 alongside ubuntu 13.04, now wanted windows 7 again with ubuntu 13.10. I am using disk /dev/sda. 3000.6 GB, 3000591900160 bytes 255 head, 63 sectors/track, 364801 cylinders, 5860531055 sectors Sector size (logical/fysical): 512 bytes / 4096 bytes Device Begin End Blocks ID System /dev/sda1 2048 419432447 209715200 83 Linux /dev/sda2 419432448 436013055 8290304 82 Linux swap /dev/sda3 436015102 1576339455 570162177 5 extended Partition 3 does not start on a fysical sector limit. /dev/sda4 * 1576339456 5860530175 2142095360 7 HPFS/NTFS/exFAT /dev/sda5 436015104 855443455 209714176 7 HPFS/NTFS/exFAT /dev/sda6 855445504 1576339455 360446976 7 HPFS/NTFS/exFAT

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• Monday at Oracle OpenWorld 2012 - Must See Session: “Using the Right Tools, Techniques, and Technologies for Integration Projects”

  - by Lionel Dubreuil

  Don’t miss this “CON8669 - Using the Right Tools, Techniques, and Technologies for Integration Projects“ session with Timothy Hall - Sr. Director, Oracle: Date: Monday, Oct 1, Time: 3:15 PM - 4:15 PM Location: Moscone South - 308 Every integration project brings its own unique set of challenges. There are many tools and techniques to choose from. How do you ensure that you have a means of consistently and repeatedly making decisions about which tools, techniques, and technologies are used? In working with many customers around the globe, Oracle has developed a set of criteria to help evaluate a variety of common integration questions. This session explores these criteria and how they have been further organized into decision trees that offer a repeatable means for ensuring that project teams are given the same guidance from project to project. Using these techniques, the presentation shows how you can reduce risk and speed productivity for your projects Objectives for this session are to: Discuss common questions that arise at the start of integration projects Review various decision criteria and approaches for getting to a consistent set of answers Explore how these techniques can be used to reduce risk and speed productivity

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• Monday at Oracle OpenWorld 2012 - Must See Session: “Using the Right Tools, Techniques, and Technologies for Integration Projects”

  - by Lionel Dubreuil

  Don’t miss this “CON8669 - Using the Right Tools, Techniques, and Technologies for Integration Projects“ session with Timothy Hall - Sr. Director, Oracle: Date: Monday, Oct 1, Time: 3:15 PM - 4:15 PM Location: Moscone South - 308 Every integration project brings its own unique set of challenges. There are many tools and techniques to choose from. How do you ensure that you have a means of consistently and repeatedly making decisions about which tools, techniques, and technologies are used? In working with many customers around the globe, Oracle has developed a set of criteria to help evaluate a variety of common integration questions. This session explores these criteria and how they have been further organized into decision trees that offer a repeatable means for ensuring that project teams are given the same guidance from project to project. Using these techniques, the presentation shows how you can reduce risk and speed productivity for your projects Objectives for this session are to: Discuss common questions that arise at the start of integration projects Review various decision criteria and approaches for getting to a consistent set of answers Explore how these techniques can be used to reduce risk and speed productivity

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• Does home directory encryption depend on gnome keyring?

  - by pedorro

  My gnome-keyring has somehow gotten messed up. It prompts for a password (that I know I never provided - yes I chose 'unsafe storage'). None of the possible passwords that I use (including empty) are working. So basically I want to delete the default key so I can start over. I just want to confirm that this isn't somehow tied to my home directory encryption. I want to be sure that if I delete the default key from it, I will still be able to log in normally and decrypt my home directory. It seems likely that they're unrelated as the keyring is within the home directory and is thus itself encrypted, but I just thought I'd ask. Anyone have any thoughts?

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• How does having assets saved on a secondary domain(s) reduce the load time of the website?

  - by AAA

  I went for an interview yesterday where I was asked this question: "How does having assets (images/videos) stored on a secondary domain (assets.example.com) reduce the load time of example.com?" To that I answered that by having the code "call" those assets from a secondary website it reduces the traffic that is coming to the main domain and therefore only applying bandwidth to the main domain vs having to also serve bandwidth to request assets. Is that correct? Also, If i am correct, would you say it makes sense to start new websites with this in mind or do you prefer having it done after large traffic rates are achieved?

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• Suddenly Spotify doesn't work anymore

  - by user191781

  I've been using Spotify for 18 months without a problem. I use Ubuntu 12.04. Today Spotify stopped and doesn't start anymore. I only see a quick flash of the Spotify-startup-screen and thats it. I uninstalled using Synaptic and reinstalled using Synaptic. No solution. I uninstalled using Synaptic and reinstalled by terminal. No solution. I used Backup to set the system back two days. No solution. I see no error message and I ran out of options I know of.

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• How can I defend Ruby on Rails against customers' not technical opinion?

  - by okeen

  My customer, a translations business owner, just told me that he has been reading about Ruby on Rails and told me that "there are more PHP guys around there" and "it seems the community prefers it". What would you, as software engineer and freelancer, say to the customer to achieve these goals: Sell Make him see that the technology is my expert decision and Rails is as good or better than PHP (+ whatever framework) for this particular project. UPDATE: Thank you all for the suggestions! Tomorrow I've got another meeting with him, let's see how it goes, I will update again :) UPDATE 2: Finally I told him to read this thread and the result has been fantastic: He gave me the project and we are going to start right now. Thank you all for the help, you have free beer in my charge if we see someday :) BTW: I learned the lesson: be as transparent as possible, because if you believe in yourself and your work, there is no question compromising enough to beat you. regards

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• My screen is messed up, using GeForce 8400 GS NVIDIA

  - by Ask Me

  My screen is all messed up. I can see everything beside my start menu and when I scroll up the mouse arrow goes up and out of the screen. It's not normal. Do I need to install "GeForce 8400 GS NVIDIA" drivers on my Ubuntu 12.10 32-bit machine? Please be very patient with me and use very simple words that a simple newbie could understand. I am very very new to this OS and I don't know much of the Ubuntu/Linux terminology. Thanks guys, stay blessed.

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• How to setup complete file access and control on a network

  - by user96270

  I have a media server running ubuntu 12.04 and I want it setup so that any PC on the network (windows etc) has complete access to all files, folders etc with read, write, edit, copy to, copy from permissions. No need for security (IE no password or user name, just select it on the network and start editing). I have samba installed and personal file sharing is enabled but my windows PC cannot see it on the network. I already set up another server as I described but unfortunately I can't remember how or where I found the guides for it. Any on know of a guide that covers what I want?

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• Diminishing Returns - When is it Time to Take Your Website Live?

  Being a perfectionist is not always the best way to be. Especially in a world where being first to market isn't the worst thing ever. Like many things in life, deciding when to take your new website live is a fine balancing act. The sooner you can start building up a readership or client base, the better; but you risk serious damage to your site's reputation if its functional and technical performance is below par. So when is the right time?

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• Tuning Distributed Applications to Access Big Data

  Distributed applications are just that: distributed across one or more hardware platforms across the enterprise. The database administrator (DBA) has the unenviable task of monitoring these environments and configuring and tuning the database server to meet multiple needs. As multiple distributed applications now require access to a very large data store, what tuning options are available to help? Get your SQL Server database under version control now!Version control is standard for applications, but databases haven’t caught up. So how can you bring database development up to speed? Why should you start? Find out…

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• Dropbox 99% instalation crash. Strange "Searching" Ubuntu Software Center bug [closed]

  - by kocios

  Possible Duplicate: Dropbox fails to install, stuck at 99% I just installed Dropbox via Ubuntu Software Center, and the known crash of 99%, which was in Ubuntu Software center, happened. I want to remove Dropbox completely since something went wrong, but I can't. When I start my Ubuntu, it starts a process which eats up all of the CPU. In Ubuntu Software Center, there is a process "Searching Applying Changes", but nothing really happens. When I'm trying to uninstall Dropbox, nothing happens, since the seaching thing is "first". Please, I'm asking for a option which doesn't include proper reinstallation of Dropbox, only of getting rid of it, and without reinstalling the whole Ubuntu system (format, chaos etc).

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• Building a simple web app with database? [on hold]

  - by Zooce

  I'm building a simple airline reservation system (web app) for a class. I'm trying to find out where to start learning about implementing and integrating a sql database. User's should be able to search for available flights based on destination and departure cities and the like. A good example would be Google Flights. I'd like to access a data base with all of the flight information and display it within tables on the web page. Admins should be able to modify the databases as well. I've tried to learn about things like Node.js, PHP, and AJAX, but most of the tutorials that I've found have been difficult to understand. Any suggestions would be really appreciated, thanks!

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• Get Lit

  - by T

  I keep meaning to post some technical blog posts.  I have the ideas stacked up but get distracted with side projects like this latest one http://getlit.eventbrite.com .  This is going to be awesome fun!  It is a hands-on event to work though a Silverlight project from start to finish.  The project will allow you to take netflix data and store it in a personal catalog of movies.  It isn’t exactly useful but it is designed to have data from multiple sources (O’Data and SQL using RIA and MVVM) and different UI aspects for some cool templating practice and custom build behaviors. Sign up soon.  Space is limited! http://getlit.eventbrite.com

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• need expert guideline on learning java?

  - by user75222

  I am a 3rd year university student in computer science. My goal is to become a very good Developer in JAVA. I have made 2 of my university projects in java. I have a newbie knowledge about JAVA and i also have good skills in Object oriented programming concepts. But i zero knowledge in networking no desktop applications. So, I decided to try some open source projects. read them thoroughly and practice on them. I am looking for advice from where to start? any suggestions?

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• What is the most handy function you've ever came across? [closed]

  - by Viniyo Shouta

  Obviously everything is 'handy' when it comes to programming terms, but some get a highlight spot, like containers, matrix trasnformation functions and many others. But in this case please mention the one it was more handy to you, saved you from sparing hours resolving a problem, or even the one you like more, What is it and what does it does? I'll start with an example. Language: C++ Function: std::sort (STL) What does it does: Arranges the elements in a specified range into a nondescending order or according to an ordering criterion specified by a binary predicate. (It arranges a container in decreasing order) Why of this question? Because I want to learn how to if possible make my own implementations of these functions for pure studying purposes, to enhance knowledge

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• Windows 8: Paradigm Shift

  You've probably heard a lot about the loss of the Start button in Windows 8. While it isn't completely lost - you can still get to it via a convoluted path - its disappearance is merely a sign of the rethinking that went into the operating system's creation. Window 8's designers made certain assumptions while building the new system: Users will interact with the operating system predominantly through a touch interface. Users will do their computing on mobile devices, and may in fact use several different devices for the same purposes. They may even want to get work done on devices they do n...

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• Either I'm not confident I just don't know anything [on hold]

  - by zoomerzoom25

  My name is Sael and I'm 14 years old. Since I was 12 and I got my first computer I instantly go interested in making games. So of course like any other I googled it, got discouraged and forgot about it for a few months. When I was 13 I decided to continue programming, and decided that java would best suit me. Now after a year, I have a basic understanding of java and how it works (it just clicked instantly one day). Anyways, my problem is that I know how I'm going to make a simple game in my head, but as soon as I click that "New Project" button on eclipse, I'm instantly lost and can't figure out where to start. I can't do much without a tutorial beside me since my mind is so dependent on it. So here's the question : what can I do to get past this problem of mine, and have any of you felt like this before? sorry if my English is a bit incorrect, Spanish is my main language* I've made Minecraft mods before

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