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• How to install Percona Xtrabackup to Ubuntu 12.04LTS?

  - by coding crow

  I am trying to install Percona Xtrabackup to my Ubuntu 12.04 LTS insatlled on Amazon EC2. I am trying to follow instruction on the Xtrabackup installation page here. The instruction follows as Add this to /etc/apt/sources.list, replacing squeeze with the name of your distribution: deb http://repo.percona.com/apt squeeze main deb-src http://repo.percona.com/apt squeeze main In my case I will replace squeeze with precise but when I open /etc/apt/sources.list for editing it says the following It is suggestion three alternatives instead of editing which are listed a.), b.) and c.). My Question What should I do to install Percona Xtrabackup to my box?

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• Using which technique does facebook and pininterest show images?

  - by manish

  If anybody has ever noticed that when you open a image in Facebook something like this happens:- suppose you are at your homepage on Facebook:- the URL is https://www.facebook.com/ now if you open a image it gets opened in new modal like window and URL changes to:- https://www.facebook.com/photo.php?fbid=10151125374887397&set=a.338008237396.161268.36922302396&type=1&theater As far as I know in any common case a modal overlay would have kept the url in the address bar the same , My question is how does facebook / pintrest achieve this behaviour of not re-loading the whole page but still achieving the change in the address bar. Is there any jquery or javascript plugin for this?

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• How long should one wait before going for a MS?

  - by Jungle Hunter

  Removed duplicate aspects of the question Hi! I'm an undergraduate Master's student. I've what seems to be a good offer in hand in Singapore (if location plays a role). Is an undergraduate Master's good enough for a Master's or one should go for MS? How much time should one wait (in their job) before going for a MS if that's the decision? Does one lose the progress which one makes while at the job before the Master's? Note: Undergraduate Master's is when my degree is called Master's but it is my first degree. This one is a four year one.

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• How to play .mp4 movies?

  - by Andrew

  I have a .mp4 movie (it's an .mp4 file, and the "video codec" is Xvid, and the "audio codec" is mp3) that I want to play, but when I try to open it in MPlayer, it says "The steam is encrypted and decryption is not supported." I tried to apply the answer from this question and this wiki page, but neither worked. Any suggestions? The file came from an [apparently] less than reputable site, which I guess I can't link to. :( I've tried: sudo apt-get install ubuntu-restricted-extras sudo apt-get install libdvdread4 sudo /usr/share/doc/libdvdread4/install-css.sh sudo apt-get install gstreamer0.10-ffmpeg sudo apt-get install w64codecs sudo apt-get update

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• design pattern for unit testing? [duplicate]

  - by Maddy.Shik

  This question already has an answer here: Unit testing best practices for a unit testing newbie 4 answers I am beginner in developing test cases, and want to follow good patterns for developing test cases rather than following some person or company's specific ideas. Some people don't make test cases and just develop the way their senior have done in their projects. I am facing lot problems like object dependencies (when want to test method which persist A object i have to first persist B object since A is child of B). Please suggest some good books or sites preferably for learning design pattern for unit test cases. Or reference to some good source code or some discussion for Dos and Donts will do wonder. So that i can avoid doing mistakes be learning from experience of others.

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• Going back to ASP.Net Webforms from ASP.Net MVC. Recommend patterns/architectures?

  - by jlnorsworthy

  To many of you this will sound like a ridiculous question, but I am asking because I have little to no experience with ASP.Net Webforms - I went straight to ASP.Net MVC. I am now working on a project where we are limited to .Net 2.0 and Visual Studio 2005. I liked the clean separation of concerns when working with ASP.Net MVC, and am looking for something to make webforms less unbearable. Are there any recommended patterns or practices for people who prefer asp.net MVC, but are stuck on .net 2.0 and visual studio 2005?

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• How to play VOB files that were inside a DVD disc?

  - by Cristian

  I just downloaded a DVD which is for a movie. After uncompressing the DVD file I see .VOB, .IFO and .BUP files. If I open the first .VOB file it shows me the DVD menu but I can't interact with it. So, my question is... is Totem able to play those kind of files? If so, how can I achieve that? What other app could I use in order to reproduce those files? Edit Using VLC didn't work neither. I forgot to mention I have already tried that. Let me rephrase: if I open the first video file it shows the DVD menu, BUT I can't interact with it.

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• structure problem in Relational DBMS creation

  - by Kane

  For learning and understanding purpose, I currently want to try to make a small relational DBMS with simple features like (for now) only sequential reading/writing and CREATE TABLE, INSERT, SELECT, UPDATE and DELETE management. I am currently on the "think" part of the project and I am stuck on the way to store the read data in memory. First I was thinking of putting them properly on a structure, but the problem is that tables are all different, know the type of each column is not an issue, but I am not sure C provide a way to make fully dynamic structure. My second and current idea is to make a simple char array of the required length and just get the data by order with cast. But I am not sure if it is the good way to do that part, so I wanted to ask for your opinion and advices about that. Thanks in advance for your help. nb: I hope my question is enough clear and understandable, I still lack of pratice in english

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• Avoid Ajax loaded content for search engine bots

  - by Majiy

  A website I run has a lot of content that is being loaded using Ajax. The reason for using Ajax is that the content generation takes some time (a few seconds), because it loads data from other websites using their respective APIs. My concern is, that search engine bots will not see any useful content. The solution I've been thinking about would be to serve search engine bots differently, so that the content will be displayed directly for them. Technically, this would not be a big problem. My question is: Will search engines (read: Google) consider this behaviour as website cloaking? Are there other concerns I might not have considered?

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• Multi-platform Map Application

  - by Mahdi

  I'm working on a web project (PHP, jQuery) which currently using Google Maps powering up the map functionality of the application, however we need to make it multi-platform like you can go to the dashboard and choose one from 5-10 map providers (which Goolge Maps is just one of them) to underlying your map functionality. So, as the application is supposed to show the data on map, almost in every single place we have to deal with the API provided by that specific map provider. Currently we are thinking about revising our modular structure and/or making something like an adapter for each provider to deal with their native syntax but via our standard methods. I wish to have your ideas and your experiences, specially if you ever made an interface for dealing via 2-3 different map providers. That would helps much and I really appreciate that. If you need any further information, just ask me to update the question. Update: As Vicky Chijwani suggested Mapstraction, now I'm also wondering which one is more better (pros & cons), having an adapter implemented on Javascript or PHP?

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• What are the downsides of implementing a singleton with Java's enum?

  - by irreputable

  Traditionally, a singleton is usually implemented as public class Foo1 { private static final Foo1 INSTANCE = new Foo1(); public static Foo1 getInstance(){ return INSTANCE; } private Foo1(){} public void doo(){ ... } } With Java's enum, we can implement a singleton as public enum Foo2 { INSTANCE; public void doo(){ ... } } As awesome as the 2nd version is, are there any downsides to it? (I gave it some thoughts and I'll answer my own question; hopefully you have better answers)

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• Ubuntu 12.04 "Do nothing" when "lid closed" blanks out external monitor

  - by Elijah Lynn

  This is not the same as this question. I have Ubuntu 12.04 running with an Nvidia card on a W510 Thinkpad. I have one external monitor connected. When I change the power settings to "Do nothing" when "Lid closed" it still keeps the system running which is great. However, it blanks out the display on any external monitors making the system useless. I plan on getting a dock soon and having to identical resolution monitors and would love to be able to dock the monitor and work as normal on the external monitors. Does anyone have a suggestion or fix for this? Should I report this as a bug or feature request?

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• Sample size and statistical significance in Google Analytics

  - by colmcq

  I have been asked to compile a report into dropout rates during checkout for a global webstore I have used a sample size over one month as my sample because: google analytics slows to a crawl over larger sample sizes and makes much of the analysis agonisingly small I believe it to be statistically significant and a representative sample My client has asked me why I didn't use yearly figures and wants proof that one month of data is 'statistically significant'. Am I right in thinking that I need to compare the standard deviation of my monthly sample to the yearly sample and ensure that the deviation is under a certain %age? Question: how do I prove one month of Google Analytics data is representative to one year worth of data? Stats: 90k unique views/month ~1.1m per year.

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• Good resources for JavaScript 2D game programming?

  - by DJCouchyCouch

  As an exercise, I've decided to look into JavaScript for game programming. While it's far from being the best language for that, I do like the idea that it's cross-platform and it's always available as a web page. So I thought I'd see what I could do with it. Specifically, I'd like to make a 2D tile-based game of some kind. Where can I find resources to do that? I'm sure this question's come up before, but I can't find any reference to it.

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• What's the importance of the "title" tag?

  - by Matteo Mosca

  Talking with some other people recently, it came up an interesting topic. The core question at hand is: What's the real importance and weight of the <title> tag in a web site? For instance, what are the consequences if a site has the same <title> tag on all the pages, reporting only the site name? Or better (or worse) no title tag at all? Will that be a little/medium/huge SEO problem? How will the pages appear on search engines? Will fixing it in a later stage be problematic since pages have already been indexed? How does it compromise the overall usability/accessibility/experience? Is that a "feature" that can be omitted, or it can't even be considered a "feature" but a core element? I have quite my opinion on this topic, but I'd really love to hear what other experts (you) think about it.

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• Is reference to bug/issue in commit message considered good practice?

  - by Christian P

  I'm working on a project where we have the source control set up to automatically write notes in the bug tracker. We simply write the bug issue ID in the commit message and the commit message is added as a note to the bug tracker. I can see only a few downsides for this practice. If sometime in the future the source code gets separated from the bug tracking software (or the reported bugs/issues are somehow lost). Or when someone is looking in the history of commits but doesn't have access to our bug tracker. My question is if having a bug/issue reference in the commit message is considered good practice? Are there some other downsides?

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• How attach a model with another model on a specific bone?

  - by Mehdi Bugnard

  I meet a difficulty attached to a model to another model on a "bone" accurate. I searched several forums but no result. I saw that many people have asked the same question but no real result see no response. Thread found : How to attach two XNA models together? How can I attach a model to the bone of another model? http://stackoverflow.com/questions/11391852/attach-model-xna But I think it is possible. Here is my code example attached a "cube" of the hand of my player private void draw_itemActionAttached(Model modelInUse) { Matrix[] Model1TransfoMatrix = new Matrix[this.player.Model.Bones.Count]; this.player.Model.CopyAbsoluteBoneTransformsTo(Model1TransfoMatrix); foreach (ModelMesh mesh in modelInUse.Meshes) { foreach (BasicEffect effect in mesh.Effects) { Matrix model2Transform = Matrix.CreateScale(1f) * Matrix.CreateFromYawPitchRoll(0, 0, 0); effect.World = model2Transform * Model1TransfoMatrix[0]; //root bone index effect.View = arcadia.camera.View; effect.Projection = arcadia.camera.Projection; } mesh.Draw(); } }

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• When should I use AtomPub?

  - by Gary Rowe

  I have been conducting some research into RESTful web service design and I've reached what I think is a key decision point so I thought I'd offer it up to the community to get some advice. In keeping with the principles of a RESTful architecture I want to present a discoverable API, so I will be supporting the various HTTP verbs as fully as possible. My difficulty comes with the choice of representation of those resources. You see, it would be easy for me to come up with my own API that covers how search results are to be presented and how links to other resources are provided, but this would be unique to my application. I've read about the Atom Publishing Protocol (RFC 5023), and how OData promotes its use, but it seems to add an extra level of abstraction over what is (currently) a rather simple API. So my question is, when should a developer select AtomPub as their choice of representation - if at all? And if not, what is the current recommended approach?

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• Cannot assign keys to Wacom scroll wheel anymore

  - by UncleZeiv

  Hi all, my Wacom Graphire 4 used to work perfectly well until, I think, Ubuntu 10.4. At that point something changed in the configuration and I couldn't assign a key to the scroll wheel anymore (note: the pad's scroll wheel, not the mouse's), i.e this command: xsetwacom set "Wacom Graphire4 6x8 pad" AbsWDn "key +" returns silently without error but nothing happens. Same goes for AbsWUp, RelWDn, RelWUp. Apparently though the problem is even deeper as pressing the wheel in a xev window doesn't seem to have any effect. Moreover I am thoroughly confused on how the various pieces (kernel driver, xorg driver, evdev, HAL, xinput?) are supposed to work together and if the wacom module that ships with Ubuntu is the one from linuxwacom or not. Any ideas? I don't want to become an X.org hacker just to understand what's going on... it used to work! NOTE: I have already read question 3940, but that's not the same problem.

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• Size limit while using UICollectionView as tiled map for iOS game?

  - by Alexander Winn

  I'm working on a turn-based strategy game for iOS, (picture Civilization 2 as a template example), and I'm considering using a UICollectionView as my game map. Each cell would be a tile, and I could use the "didSelectCell" method to handle player interaction with each tile. Here's my question: I know that UICollectionViewCells are dequeued and reused by the OS, so does that mean that the map could support an effectively infinitely-large map, so long as only a few cells are onscreen at a time? However many cells were onscreen would be held in memory, and obviously the data source would take up some memory, but would my offscreen map be limited to a certain size or could it be enormous so long as the number of cells visible at any one time wasn't too much for the device to handle? Basically, is there any memory weight to offscreen cells, or do only visible cells have any impact? Also, does a UICollectionView seem like a bad idea for a game map, in a way I haven't thought of yet? It seems like it work well, but I haven't tried it yet so any thoughts are welcome.

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• EBS Procurement - Approval Workflow

  - by Annemarie Provisero

  ADVISOR WEBCAST:  Approval Workflow PRODUCT FAMILY: EBS Procurement    February 15, 2011 at 14:00 UK Time, 9:00 am ET, 4:00 pm, Egypt Standard Time, 7:30 pm, India Time This one-hour session is recommended for technical and functional users who would like to know about APPROVAL WORKFLOW TROUBLESHOOTING. TOPICS WILL INCLUDE: Introduction Purchasing Approval Basics How to See the Workflow for a Purchasing Document Advanced Troubleshooting Helpful My Oracle Support Notes Conclusion A short, live demonstration (only if applicable) and question and answer period will be included. Oracle Advisor Webcasts are dedicated to building your awareness around our products and services. This session does not replace offerings from Oracle Global Support Services.  Click here to register for this session ------------------------------------------------------------------------------------------------------------- The above webcast is a service of the E-Business Suite Communities in My Oracle Support.For more information on other webcasts, please reference the Oracle Advisor Webcast Schedule.Click here to visit the E-Business Communities in My Oracle Support Note that all links require access to My Oracle Support.

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• Is committing/checking code everyday a good practice?

  - by ArtB

  I've been reading Martin Fowler's note on Continuous Integration and he lists as a must "Everyone Commits To the Mainline Every Day". I do not like to commit code unless the section I'm working on is complete and that in practice I commit my code every three days: one day to investigate/reproduce the task and make some preliminary changes, a second day to complete the changes, and a third day to write the tests and clean it up^ for submission. I would not feel comfortable submitting the code sooner. Now, I pull changes from the repository and integrate them locally usually twice a day, but I do not commit that often unless I can carve out a smaller piece of work. Question: is committing everyday such a good practice that I should change my workflow to accomodate it, or it is not that advisable? ^ The order is more arbitrary and depends on the task, my point was to illustrate the time span and activities, not the exact sequence.

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• Google not recognizing microdata? [duplicate]

  - by user1795832

  This question already has an answer here: How long for data highlighter mark up to appear in structured data tool? 2 answers I put in microdata to one page of a site I help manage using schema.org. Using the Google webmaster tool test, the page checks out and displays what it sees as the microdata properly. But when I go to the Structured Data page in webmaster tools, it keeps saying the site does not have any. I put it in 2 weeks ago. Us it just something that take a while for it to recognize? Or does microdata have to be on every page for it to be recognized or something?

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• How often do CPUs make calculation errors?

  - by veryfoolish

  In Dijkstra's Notes on Structured Programming he talks a lot about the provability of computer programs as abstract entities. As a corollary, he remarks how testing isn't enough. E.g., he points out the fact that it would be impossible to test a multiplication function f(x,y) = x*y for any large values of x and y across the entire ranges of x and y. My question concerns his misc. remarks on "lousy hardware". I know the essay was written in the 1970s when computer hardware was less reliable, but computers still aren't perfect, so they must make calculation mistakes sometimes. Does anybody know how often this happens or if there are any statistics on this?

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• Are there any examples of a temporal field/object updater?

  - by Bryan Agee

  The system in question has numerous examples of temporal objects and fields--ones which are a certain variable at a certain point in time. An example of this would be someone's rate of pay--there are different answers depending on when you ask and what the constraints might be; eg, can there ever be more than one of a certain temporal object concurrently, etc. Ideally, there would be an object that handles those constraints when a new state/stateful object is introduced; when a new value is set, it would prevent creating negative ranges and overlaps. Martin Fowler has written some great material on this (such as this description of Temporal Objects) , but what I've found of it tends to be entirely theoretic, with no concrete implementations. PHP is the target language, but examples in any language would be most helpful.

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