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• How to fo fluid dynamics like Where's My Water?

  - by Edgar Miranda

  There is a game on the app store called "Where's My Water" that is really fun and uses fluid dynamics in it's gameplay. You can check out a video of the game play here... http://www.youtube.com/watch?v=UnFFWnwOohk. You use your finger to remove dirt from the screen, and then the water just flows to the new area. Anyone know what engine this was made in and how they where able to get the fluid dynamics in there? I'm using the Corona SDK for mobile development and want to do something similar like this (a game with fluid dynamics).

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• Hiring Developers - Any tips on being more efficient?

  - by DotnetDude

  I represent a software company that is in process of building a large software development team. We are picky in who we hire and have really good retention rate (most of the devs have been here for an average of 5-6 years). We've been spending a lot of developers' and HR time and have a low applications to hire ratio. Here's the process we use: HR Interview on phone - Involves asking basic behaviorial and tech questions Online test - Involves a 30 minute technical test Technical Phone interview - A 60 minute interview by a developer Onsite Interview - A 60-90 minute interview by several senior developers Although this process has been working, we've been spending way too much time on interviews. Any thoughts on how this can be done differently? Our goal is to automate any tasks if possible still retaining the quality of talent.

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• How To Log Into Multiple Accounts On the Same Website At Once

  - by Chris Hoffman

  If you ever want to sign into two different accounts on the same website at once – say, to have multiple Gmail inboxes open next to each other – you can’t just open a new tab or browser window. Websites store your login state in browser-specific cookies. There are a number of ways you can get another browser window with its own cookies and stay logged into multiple accounts at once. HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems

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• Ubuntu One Windows application only accessing gpg files

  - by Boomer Kuwanger

  I'm on a windows 7 (64) machine right now, I have the Ubuntu One windows application. I'm synced to my online account, the folder I am accessing is... deja-dup\My-desktop When I click 'Sync Locally' checkbox and explore my folder I am only able to see three files of the form duplicity-full.#######.manifest.gpg duplicity-full.#######.vol1.difftar.gpg duplicity-full-signatures.#######.sigtar.gpg How do I access the content of these file? I put them on a linux server and decrypted them/ extracted them, however something is wrong. Note: I cannot use apt-get on the linux server I'm using. Is there a way to access these files using the Ubuntu one software for windows? Many Thanks, Boomerkuwanger

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• Login screen appears even if logged in

  - by Prasenjit

  HEHE it's a stupid problem, for those who care place the following on the load event of the master page or default             Response.AppendHeader("Cache-Control", "no-cache"); //HTTP 1.1             Response.AppendHeader("Cache-Control", "private"); // HTTP 1.1             Response.AppendHeader("Cache-Control", "no-store"); // HTTP 1.1             Response.AppendHeader("Cache-Control", "must-revalidate"); // HTTP 1.1             Response.AppendHeader("Cache-Control", "max-stale=0"); // HTTP 1.1              Response.AppendHeader("Cache-Control", "post-check=0"); // HTTP 1.1              Response.AppendHeader("Cache-Control", "pre-check=0"); // HTTP 1.1              Response.AppendHeader("Pragma", "no-cache"); // HTTP 1.1              Response.AppendHeader("Keep-Alive", "timeout=3, max=993"); // HTTP 1.1              Response.AppendHeader("Expires", "Mon, 26 Jul 1997 05:00:00 GMT"); // HTTP 1.1   It finally worked for me:)

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• Microsoft Office Developer Sessions from SharePoint Conference 2009 Now Live

  Readers of the blog know that SharePoint Conference 2009 had some pretty memorable highlights. Now, we're excited to announce that five key Office developer sessions are now freely viewable online. Here's the list of sessions: What's New in Office 2010 for Developers: http://msdn.microsoft.com/en-us/office/ff436077.aspx This session gives you insight into the investments we've made in Office 2010, SharePoint 2010, and Visual Studio 2010 to improve the Office solution development experience. Access...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Eliminating Downtime During Database Upgrades: A Customer Case Study

  - by irem.radzik(at)oracle.com

  Planned outages, such as database, OS, hardware upgrades and migrations, are a fact of life. Even though they are "planned" and many of them are performed during "off business hours", they can still interrupt operations-- especially for global operations and online businesses. For this reason many IT organizations postpone these critical infrastructure improvement projects, which in turn result in delays in advancing business operations. This week, on Thursday January 13th, we will host a free webcast on this topic, and will feature Oracle GoldenGate's customer Atmos Energy. Atmos Energy implemented Oracle GoldenGate for eliminating downtime during their database upgrade from Oracle Database 8.1.7 to Oracle Database 11.1.0.7. Jos Francis, Lead DBA for Atmos, and Ronald Nedd, Sr. DBA for Atmos, will be presenting their database upgrade project and their solution architecture. Join us at this live webcast and hear from our customer and product management how to eliminate planned outages with Oracle GoldenGate's real-time, heterogeneous data replication capabilities.

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• What are the advantages of a $ SKU of VS2012 over Express?

  - by Clay Shannon

  I will be using Visual Studio only for creating C#/XAML Windows Store apps. Is there any reason for me to purchase a "Professional" SKU of VS 2012 rather than just using the Express (free) "Metro apps with C#/XAML" version? The only thing I can think of is that I won't be able to use Resharper in the Express version (which I've already purchased a license for, but I use it at work, so that won't be a waste of money if I can't use it at home) - plus, I believe that even the Express SKU of VS 2012 will have similar code quality utility built in.

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• How do I simplify terrain with tunnels or overhangs?

  - by KKlouzal

  I'm attempting to store vertex data in a quadtree with C++, such that far-away vertices can be combined to simplify the object and speed up rendering. This works well with a reasonably flat mesh, but what about terrain with overhangs or tunnels? How should I represent such a mesh in a quadtree? After the initial generation, each mesh is roughly 130,000 polygons and about 300 of these meshes are lined up to create the surface of a planetary body. A fully generated planet is upwards of 10,000,000 polygons before applying any culling to the individual meshes. Therefore, this second optimization is vital for the project. The rest of my confusion focuses around my inexperience with vertex data: How do I properly loop through the vertex data to group them into specific quads? How do I conclude from vertex data what a quad's maximum size should be? How many quads should the quadtree include?

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• Increase the size of a memory mapped file

  - by sandun dhammika

  I am maintaning a memory mapped file to store my tree like datastructure. When I'm updating the datastructure ,I got this problem. The file is limited on it's size and can't be too long or too small. I have a methods like void mapfile_insert_record(RECORD* /* record*/); void mapfile_modify_record(RECORD* /* record*/); Both operations could lead to exceed the space which is free on memory file. How do I overcome this? What strategy I should use. calculate whether it requires to exceed the file as a pre-condition on both methods. Dynamically exceed it , for a example manage a timer and constantly polling file for it's free avaliable size and then automatically extend it. Any ideas or patterns to overcome this problem?

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• HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It

  - by Chris Hoffman

  You’ve probably heard that you need to overwrite a drive multiple times to make the data unrecoverable. Many disk-wiping utilities offer multiple-pass wipes. This is an urban legend – you only need to wipe a drive once. Wiping refers to overwriting a drive with all 0’s, all 1’s, or random data. It’s important to wipe a drive once before disposing of it to make your data unrecoverable, but additional wipes offer a false sense of security. Image Credit: Norlando Pobre on Flickr HTG Explains: Learn How Websites Are Tracking You Online Here’s How to Download Windows 8 Release Preview Right Now HTG Explains: Why Linux Doesn’t Need Defragmenting

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• Is there a programming language with not a tree but tags idea behind OOP?

  - by kolupaev

  I'm thinking about tree structures, and I feel that I don't like them. It's like when you have a shop, then you try to put all products to tree-like catalog, and then you need to place one product to multiple categories, now you have multiple routing, bla-bla. I don't feel like everything in the world could be put to a tree. Instead, I like idea of tags. I would like to store everything with tags. With tags I could do much more. I can even simulate trees if I want. I want to have tag-based filesystem! But hey - modern OOP paradigm with inheritance is based on tree. I want to see how it is when you don't have such basement. Closest thing I found is mixins in some languages. Do you know what else is also about this ideas?

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• BPM in Retail Industry

  - by Sanjeev Sharma

  The following series of blog posts discuss common BPM use-cases in the Retail industry: Retail 2.0 represents the transformation in the retail industry triggered by the accelerated shift towards online and mobile technologies and social shopping paradigms. Never before has the consumer been of more importance or should i say in greater control, especially so due to the shrinking information asymmetry between merchants and consumers that has tilted the balance of power in the latter’s favor. For details, click Customer Experience Management for Retail 2.0 - part 1 / 2 Below is a concept architecture for streamlining front-end, mid-office and back-end interfaces through shared process to achieve consistency and efficiency in managing the customer experience from order capture to order provisioning. For details, click Customer Experience Management for Retail 2.0 - part 2 / 2 ARTS Retail Reference Model (Coming Soon!)

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• Updating Pages after migration of website

  - by DLackey

  My web site was coded in Coldfusion and over the years has obtained a good ranking. I recently migrated the front-end to a Wordpress site and wanted to know what is ideal way of updating Google and the various search engines of of the updates. For example, the home page of index.cfm is no longer valid since it's index.php. I've submitted an updated sitemap.xml file to Google. I'm sure my site will slip some while the search engines re-index my site but I'd like to try and minimize this as much as possible with the holidays coming up (my site is a service oriented site that caters to people who travel during the holidays). Right now, the old .cfm pages are still online but are re-routed to the appropriate Wordpress page (for example, about.cfm is now routed to /about/ using a cflocation tag.). Not sure if I should pull down the .cfm pages all together or leave them in place until the new pages are picked up by the search engines. Any advice would be helpful.

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• SQLite with two python processes accessing it: one reading, one writing

  - by BBnyc

  I'm developing a small system with two components: one polls data from an internet resource and translates it into sql data to persist it locally; the second one reads that sql data from the local instance and serves it via json and a restful api. I was originally planning to persist the data with postgresql, but because the application will have a very low-volume of data to store and traffic to serve, I thought that was overkill. Is SQLite up to the job? I love the idea of the small footprint and no need to maintain yet another sql server for this one task, but am concerned about concurrency. It seems that with write ahead logging enabled, concurrently reading and writing a SQLite database can happen without locking either process out of the database. Can a single SQLite instance sustain two concurrent processes accessing it, if only one reads and the other writes? I started writing the code but was wondering if this is a misapplication of SQLite.

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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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• Hot Off the Press: Oracle Publishes Agile PLM E-Book

  - by Kerrie Foy

  We’re pleased to share with you our new Oracle e-book, all about Agile PLM!  This online publication offers a mobile-friendly, interactive learning experience to explore PLM topics, including: • Benefits of taking a strategic, enterprise approach to managing the lifecycle of a product • How to identify and overcome the obstacles preventing your ideas from converting into profitable products • Quick overview video and descriptions of the solutions comprising Oracle’s Enterprise PLM solutions • Analyst perspectives and customer stories, including 4 testimonial videos from JDSU, Medtronic, Market America, and Alcatel-Lucent. It takes just a moment to download, so check it out today!

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• Hot Off the Press: Oracle Publishes Agile PLM E-Book

  - by Kerrie Foy

  We’re pleased to share with you our new Oracle e-book, all about Agile PLM!  This online publication offers a mobile-friendly, interactive learning experience to explore PLM topics, including: • Benefits of taking a strategic, enterprise approach to managing the lifecycle of a product • How to identify and overcome the obstacles preventing your ideas from converting into profitable products • Quick overview video and descriptions of the solutions comprising Oracle’s Enterprise PLM solutions • Analyst perspectives and customer stories, including 4 testimonial videos from JDSU, Medtronic, Market America, and Alcatel-Lucent. It takes just a moment to download, so check it out today!

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• Software Productivity Tools-&gt; The Missing Link?

  In an op-ed piece in this months SD Times, I make the argument that software development productivity tools have evolved over the years to become more mainstream. I make the case that while some developers shun tools, in reality they take for granted the tools they are using today that were not available 10 years or so ago, or were not that mature. For example today we use some tools without even thinking such as: SCM, build management, standards enforcement, ORM and UI components. Tools today save a team a tremendous amount of time and are the missing link in the software development process. You can get the March issue of SD Times on the newsstands today or read my article online here. Technorati Tags: Agile Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How to Move Your Google Authenticator Credentials to a New Android Phone or Tablet

  - by Chris Hoffman

  Most of the app data on your Android is probably synced online will automatically sync to a new phone or tablet. However, your Google Authenticator credentials won’t — they aren’t synchronized for obvious security reasons. If you’re doing a factory reset, getting a new phone, or just want to copy your credentials to second device, these steps will help you move your authenticator data over so you won’t lose your access codes. How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere How To Boot Your Android Phone or Tablet Into Safe Mode

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• Partitioning tutorial - new features in Oracle Database 12c

  - by KLaker

  For data warehousing projects Oracle Partitioning really is a must-have feature because it delivers so many important benefits such as: Dramatically improves query performance and speeds up database maintenance operations Lowers costs by enabling a tiered storage approach that allows data to be stored on the most cost-effective storage for better resource utilisation Combined with Oracle Advanced Compression, it provides an automated approach to information lifecycle management using a simple, efficient, yet powerful way to manage data growth and reduce complexity and costs To help you get the most from partitioning we have released a new tutorial that covers the 12c new features. Topics include how to: Use Interval Reference Partitioning Perform Cascading TRUNCATE and EXCHANGE Operations Move Partitions Online Maintain Multiple Partitions Maintain Global Indexes Asynchronously Use Partial Indexes For more information about this tutorial follow this link to the Oracle Learning Library: http://apex.oracle.com/pls/apex/f?p=44785:24:0::NO:24:P24_CONTENT_ID,P24_PREV_PAGE:8408,2 where you can begin your tutorial right now! For more information about Oracle Partitioning visit our home page on OTN: http://www.oracle.com/technetwork/database/bi-datawarehousing/dbbi-tech-info-part-100980.html

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• I don't understand why algorithms are so special

  - by Jessica

  I'm a student of computer science trying to soak up as much information on the topic as I can during my free time. I keep returning to algorithms time and again in various formats (online course, book, web tutorial), but the concept fails to sustain my attention. I just don't understand: why are algorithms so special? I can tell you why fractals are awesome, why the golden ratio is awesome, why origami is awesome and scientific applications of all the above. Heck I even love Newton's laws and conical sections. But when it comes to algorithms, I'm just not astounded. They are not insightful in new ways about human cognition at all. I was expecting algorithms to be shattering preconceptions and mind-altering but time and time again they fail miserably. What am I doing wrong in my approach? Can someone tell me why algorithms are so awesome?

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• Use of Service Bus in a Pub-Sub Engine

  - by JoseK

  In one of our projects, we've built a Publisher - Subscriber Engine on Oracle Service Bus. The functionality being a series of events are published and subscribers (JMS queues) receive these whenever a new event is published. We are facing some technical issues now, performance-wise and hence an architectural review is underway. Now for my questions: Architecturally the ESB has to publish events into a DB and read from the DB which users wish to be notified, then push the event onto their respective queues. There is a high amount of DB interaction and the question is whether ESB should be having such high amount of interaction with the DB in the first place? Or should there have been some alternate component responsible for doing this. Alternately is there any non-DB approach in which we can store the events and subscribers? Where else can this application data be held within the ESB context?

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• Is there really Object-relational impedance mismatch?

  - by user52763

  It is always stated that it is hard to store applications objects in relational databases - the object-relational impedance mismatch - and that is why Document databases are better. However, is there really an impedance mismatch? And object has a key (albeit it may be hidden away by the runtime as a pointer to memory), a set of values, and foreign keys to other objects. Objects are as much made up of tables as it is a document. Neither really fit. I can see a use for databases to model the data into specific shapes for scenarios in the application - e.g. to speed up database lookup and avoid joins, etc., but won't it be better to keep the data as normalized as possible at the core, and transform as required?

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• Vertex Array Object (OpenGL)

  - by Shin

  I've just started out with OpenGL I still haven't really understood what Vertex Array Objects are and how they can be employed. If Vertex Buffer Object are used to store vertex data (such as their positions and texture coordinates) and the VAOs only contain status flags, where can they be used? What's their purpose? As far as I understood from the (very incomplete and unclear) GL Wiki, VAOs are used to set the flags/status for every vertex, following the order described in the Element Array Buffer, but the wiki was really ambiguous about it and I'm not really sure about what VAOs really do and how I could employ them.

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