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  • How would one build a relational database on a key-value store, a-la Berkeley DB's SQL interface?

    - by coleifer
    I've been checking out Berkeley DB and was impressed to find that it supported a SQL interface that is "nearly identical" to SQLite. http://docs.oracle.com/cd/E17076_02/html/bdb-sql/dbsqlbasics.html#identicalusage I'm very curious, at a high-level, how this kind of interface might have been architected. For instance: since values are "transparent", how do you efficiently query and sort by value how are limits and offsets performed efficiently on large result sets how would the keys be structured and serialized for good average-case performance

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  • What resources are available for iPhone development using AS3?

    - by woodscreative
    I've just realeased my first game developed for the iPhone using AS3 and the iPhone Packager http://itunes.apple.com/us/app/snapshot-paintball/id407362440?mt=8&uo=4 I want to take the game to the next level but I am not using the native iPhone SDK so I need some other ideas, I am fresh to iPhone development and it's hard to find good resources, any AS3 developers out there willing to share some links? Highscore frameworks and best practices, connecting to Facebook, ui classes/gestures. Thanks.

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  • Data Binding in ASP.NET 3.5 with a Basic Example

    Data binding is a method of binding ASP.NET 3.5 web controls and the database column fields. This method of binding is necessary to produce a certain level of interactivity within the web control. This article will explain how and why to use data binding in your web applications.... Test Drive the Next Wave of Productivity Find Microsoft Office 2010 and SharePoint 2010 trials, demos, videos, and more.

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  • How to enable ufw firewall to allow icmp response?

    - by Jeremy Hajek
    I have a series of Ubuntu 10.04 servers and each one has ufw firewall enabled. I have allowed port 22 (for SSH) and 80 (if it's a webserver). My question is that I am trying to enable icmp echo response (ping reply). ICMP functions differently than other protocols--I know it is below the IP level in a technical sense. You can just type sudo ufw allow 22, but you cannot type sudo ufw allow icmp How should attack this problem?

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  • Creating a NAS Box with an Existing System

    <B>Linux Magazine:</B> "Standalone Network Attached Storage (NAS) servers provide file level storage to heterogeneous clients, enabling shared storage. This article presents the basics of NAS units (NFS servers) and how you can create one from an existing system"

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  • Oracle RightNow CX Cloud Service 2012 Specialization

    - by Richard Lefebvre
    Oracle RightNow CX Cloud Service 2012 Certified Implementation Specialist (1Z1-465) is now in beta. Partners who pass the exam will be identified to customers, Oracle, and other partners as Certified Implementation Specialists. This is also the final step towards completion of the business and competency requirements for company-level Oracle RightNow CX Cloud Service 2012 Specialization. To view the complete Specialization criteria table, click here

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  • Windows Azure Cloud Supports SUSE Linux

    The enterprise level Linux distribution can now run in Windows Azure Virtual Machines. If you're interested in using Microsoft's cloud computing platform and run the open source operating system, Azure now supports OpenSUSE 12.1, CentOS 6.2, Ubunto 12.04 and SUSE Linux Enterprise Server 11 SP2. Windows Azure now provides what Microsoft characterizes as Infrastructure as a Service (IaaS) capabilities, not only for the Linux distributions named above, but for Windows Server 2008 R2 and the Windows Server 2012 Release Candidate. If you're a fan of automation, you'll appreciate the ability to use...

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  • Does Your Website Do the Job?

    Before you even think of starting to build a website, you must put together a proper plan of how you want every part of you site to fit together, if you don't have a plan, you might as well forget about any success as failure to plan is a plan for failure. Even if you have a small one page website, you must make sure you run it to its optimum level, or you will see no rewards for your efforts whatsoever.

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  • Using Single Image for Map in 2D Platformer

    - by Jon
    I'm fairly new to game development, and have been messing around with Slick2D. Currently, my map consists of objects that are represented as rectangles. If I wanted to use am image simlar to: How would I be able to use this image to make a level? That question is a bit vague, but like I said, I'm new to game development and am not familiar with terminology or procedures. But going along with this question, how would I also use non-rectangular objects/platforms? Thanks

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  • Deciphering a Search Engine Optimization Analysis

    A search engine optimization analysis is a tool that web developers can use to track how well their sites are showing up on the most popular search engines. There are several types of analysis software and services available that will give a good reading of your website's real optimization level. Ideally, a business website will be ranked near the top of search engine results, which will drive more traffic to the site.

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  • Creating a simple watermark effect using JQuery

    - by nikolaosk
    This another post that is focusing on how to use JQuery in ASP.Net applications. If you want to have a look at the other posts related to JQuery in my blog click here In this post I would like to show you how to create a simple watermark effect using JQuery.Watermark is a great way to provide users with informarion without using more space on the screen. Some basic level of knowledge of JQuery is assumed. Sadly, we canot cover the basics of JQuery in this post so here are a few resources for you...(read more)

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  • How to Conduct a Website Self Evaluation

    Site owners looking to improve recognition and performance may wish to take some time to evaluate its present level of operation. Site owners recently completing improvements may look to see how these changes have affected site performance. The question remains: Where Do I Start?

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  • How to Optimize your Website for Local Search

    As the search engines take "search" to next level, more and more people are beginning to narrow down their searches to their cities or neighborhoods. This is because of the rising need among visitors... [Author: Debbie Everson - Web Design and Development - April 29, 2010]

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  • Backlink Your Way to the Top of Google by Tapping Into Seven Easy Sources of Backlinks

    Because backlinks boost a web page's level of authority - and authority is a key search engine ranking factor - it is absolutely essential that any web page you are trying to promote has a lot of high-quality backlinks pointing to it in order to achieve high search engine rankings. While the best backlinks are those that are earned on the strength of great content, great content will not be seen unless the web page it occupies is highly visible in the search results.

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  • Can someone explain the true landscape of Rails vs PHP deployment, particularly within the context of Reseller-based web hosting (e.g., Hostgator)?

    - by rcd
    Currently, I have a reseller account with the company HostGator. I design websites, which up until now have occasionally been wrapped in Wordpress CMSs and the like (PHP applications). I then sell hosting (of the site I've designed) to the client, which is pretty simple, in that I can simply click a button and add a new shared hosting account/site with whatever settings I want. Furthermore, I then utilize WHMCS to automate billing and account management. It's a nice package and pretty simple. I pay something like $25 a month, and can sell a hundred accounts under this (because my clients bandwidth requirements are low). Now I am finding the need to develop more customized applications, including a minimalist CMS and several proprietary things. I soon anticipate developing these apps for clients as well. Thus, I've spent the past few months learning Rails, and it's coming along well now. The thing that has nagged at me all along, though, is the deployment issue. I can't wrap my brain around it. It seems like all of the popular options (Heroku, etc) have nice automation with git and are set up in the "Rails Way". I get that (sort of). But it's terribly expensive... a single dyno, a helper, and the cheapest database (which they say is mainly suitable for testing) that isn't limited to 5MB runs $51. This is for ONE app!!! Throw in a "production" DB and you're over $200. This is like... the same prices as getting a server somewhere, right? Meanwhile, going back to what I guess is a "traditional" hosting environment with Hostgator, their server only has Ruby 1.8.7 and Rails 2.3.5... No Rails 3. AND, no Passenger (not that I really understand the difference in CGI or mod_rails or whatever, but they say Passenger is the simplest). So I'm to understand that if I build an app in Rails 3, it won't run at all on this host? But damn, I already have these accounts under my reseller account there, all running static html and/or PHP stuff, right? So what now? How do I get all of this under one simple (and affordable) roof? Forgive my ignorance, but I just don't get it. Managing a VPS is cool and all, but entails learning server admin stuff and security... And it's expensive. I get that a shared and/or reseller "server-based" (forgive the terminology) may be inadequate for large-scale apps that use a lot of bandwidth... But what about for those of us who are building real (but small and low bandwidth) apps (with Rails) and who want to deploy them simply, cheaply, using the same conceptual approach as PHP? Even after learning all of this Ruby and Rails stuff for months, I'm questioning whether it's worth it when it comes to deployment. I want to build a small app, upload it to my home directory on a shared server account, and just make it run. Why should that be so hard? Am I just choosing the wrong language/framework? Forgive my ignorance in the subject; these questions are not rhetorical; just trying to learn here. So: 1) I'd appreciate if someone could give me a good rundown of how to understand deployment in Rails vs. PHP. 2) I'd appreciate if someone could address my issue with running a hosting/web business around reseller hosting (Hostgator) while also being able to host Rails apps. Can it be done? And how can a company like Hostgator completely ignore what's current in Rails/Ruby? Thanks.

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  • What to expect during an interview with a senior development executive?

    - by Umanga
    I passed first two technical interviews at a global e-commerce company for the position of senior software engineer. I was told that there are two more interviews, one with a senior development executive and another with a person from human resources (HR). What kind of questions I should expect during the interview with the senior development executive? Is is technical, high level architecture related, etc.? During HR interviews, is it ok to ask about the work-life balance and actual working hours?

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  • Determine Better Coding Practice

    - by footprint.
    As a new programmer, it has always been hard to create applications, because I am still at the learning stage. I understand that to achieve a particular affect or function in an application, there will be numerous ways to achieve the same result. However, should I just purely create a function to it's working state, which means that as long as it works, just as the way I want it to, then it should be fine. Can any fellow programmers of a higher level kindly let me know the right way of doing things?

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  • Testing and Validation – You Really Do Have The Time

    - by BuckWoody
    One of the great advantages in my role as a Technical Specialist here at Microsoft is that I get to work with so many great clients. I get to see their environments and how they use them, and the way they work with SQL Server. I’ve been a data professional myself for many years. Over that time I’ve worked with many database platforms, lots of client applications, and written a lot of code in many industries. For a while I was also a consultant, so I got to see how other shops did things as well. But because I now focus on a “set” base of clients (over 500 professionals in over 150 companies) I get to see them over a longer period of time. Many of them help me understand how they use the product in their projects, and I even attend some DBA regular meetings. I see the way the product succeeds, and I see when it fails. Something that has really impacted my way of thinking is the level of importance any given shop is able to place on testing and validation. I’ve always been a big proponent of setting up a test system and following a very disciplined regimen to make sure it will work in production for any new projects, and then taking the lessons learned into production as standards. I know, I know – there’s never enough time to do things right like this. Yet the shops I see that do it have the same level of work that they output as the shops that don’t. They just make the time to do the testing and validation and create a standard that they will follow in production. And what I’ve found (surprise surprise) is that they have fewer production problems. OK, that might seem obvious – but I’ve actually tracked it and those places that do the testing and best practices really do save stress, time and trouble from that effort. We all think that’s a good idea, but we just “don’t have time”. OK – but from what I’m seeing, you can gain time if you spend a little up front. You may find that you’re actually already spending the same amount of time that you would spend in doing the testing, you’re just doing it later, at night, under the gun. Food for thought.  Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Employer admits that its developers are underpaid and undervalued. Time to part ways?

    - by Psionic
    My employer recently posted an opening for a C# Developer with 3-5 years of experience. The requirements and expectations for the position were fair, up until the criteria for salary determination. It was stated clearly that compensation would depend ONLY on experience with C#, and that years of programming experience with other languages & frameworks would be considered irrelevant and not factored in. I brought up my concern with HR that good candidates would see this as a red flag and steer away. I attempted to explain that software development is about much more than specific languages, and that paying someone for their experience in a single language is a very shortsighted approach to hiring good developers (I'm telling this to the HR dept of a software company). The response: "We are tired of wasting time interviewing developers who expect 'big salaries' because they have lots of additional programming experience in languages other than what we require." The #1 issue here is that 'big salaries' = Market Rate. After some serious discussion, they essentially admitted that nobody at the company is paid near market rate for their skills, and there's nothing that can be done about it. The C-suite has the mentality that employees should only be paid for skills proven over years under their watch. Entry-level developers are picked up for less than $38K and may reach 50K after 3 years, which I'm assuming is around what they plan on offering candidates for the C# position. Another interesting discovery (not as relevant) - people 'promoted' to higher responsibilities do not get raises. The 'promotion' is considered an adjustment of the individuals' roles to better suit their 'strengths', which is what they're already being paid for. After hearing these hard truths straight from HR, I would assume that most people who are looking out for themselves would quickly begin searching for a new employer that has a better idea of what they're doing in the industry (this company fails in many other ways, but I don't want to write a book). Here is my dilemma however: This is the first official software development position I've held, for barely 1 year now. My previous position of 3 years was with a very small company where I performed many duties, among them software development (not in my official job description, but I tried very hard to make it so). I've identified local openings that I'm currently qualified for, most paying at least 50% more than I'm getting now. Question is, is it too soon for a jump? I am getting valuable experience in my current position, with no shortage of exciting projects. The work environment is very comfortable, and I'm told by many that I'm in the spotlight of the C-level guys for the stuff that I've been able to accomplish during my short time (for what that's worth). However, there is a clear opportunity cost to staying, knowing now with certainty that I will have to wait 3-5 years only to be capped at what I could potentially be earning elsewhere this year. I am also aware that 'job hopper' is a dangerous label to have, regardless of the reasons.

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  • Is the Leptonica implementation of 'Modified Median Cut' not using the median at all?

    - by TheCodeJunkie
    I'm playing around a bit with image processing and decided to read up on how color quantization worked and after a bit of reading I found the Modified Median Cut Quantization algorithm. I've been reading the code of the C implementation in Leptonica library and came across something I thought was a bit odd. Now I want to stress that I am far from an expert in this area, not am I a math-head, so I am predicting that this all comes down to me not understanding all of it and not that the implementation of the algorithm is wrong at all. The algorithm states that the vbox should be split along the lagest axis and that it should be split using the following logic The largest axis is divided by locating the bin with the median pixel (by population), selecting the longer side, and dividing in the center of that side. We could have simply put the bin with the median pixel in the shorter side, but in the early stages of subdivision, this tends to put low density clusters (that are not considered in the subdivision) in the same vbox as part of a high density cluster that will outvote it in median vbox color, even with future median-based subdivisions. The algorithm used here is particularly important in early subdivisions, and 3is useful for giving visible but low population color clusters their own vbox. This has little effect on the subdivision of high density clusters, which ultimately will have roughly equal population in their vboxes. For the sake of the argument, let's assume that we have a vbox that we are in the process of splitting and that the red axis is the largest. In the Leptonica algorithm, on line 01297, the code appears to do the following Iterate over all the possible green and blue variations of the red color For each iteration it adds to the total number of pixels (population) it's found along the red axis For each red color it sum up the population of the current red and the previous ones, thus storing an accumulated value, for each red note: when I say 'red' I mean each point along the axis that is covered by the iteration, the actual color may not be red but contains a certain amount of red So for the sake of illustration, assume we have 9 "bins" along the red axis and that they have the following populations 4 8 20 16 1 9 12 8 8 After the iteration of all red bins, the partialsum array will contain the following count for the bins mentioned above 4 12 32 48 49 58 70 78 86 And total would have a value of 86 Once that's done it's time to perform the actual median cut and for the red axis this is performed on line 01346 It iterates over bins and check they accumulated sum. And here's the part that throws me of from the description of the algorithm. It looks for the first bin that has a value that is greater than total/2 Wouldn't total/2 mean that it is looking for a bin that has a value that is greater than the average value and not the median ? The median for the above bins would be 49 The use of 43 or 49 could potentially have a huge impact on how the boxes are split, even though the algorithm then proceeds by moving to the center of the larger side of where the matched value was.. Another thing that puzzles me a bit is that the paper specified that the bin with the median value should be located, but does not mention how to proceed if there are an even number of bins.. the median would be the result of (a+b)/2 and it's not guaranteed that any of the bins contains that population count. So this is what makes me thing that there are some approximations going on that are negligible because of how the split actually takes part at the center of the larger side of the selected bin. Sorry if it got a bit long winded, but I wanted to be as thoroughas I could because it's been driving me nuts for a couple of days now ;)

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  • Unittest test case only touches the file name

    - by Chen OT
    I was told that unittest is fast and the tests which touches DB, across network, and touches FileSystem are not unittest. In one of my testcases, its input are the file names (amount about 300~400) under a specific folder. Although these input are part of file system, the execution time of this test is very fast. Should I moved this test, which is fast but touches file system, to higher level test?

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  • Database Continuous Integration 101

    We talk a lot about continuous integration here on the Atlassian Dev Tools blog, and many readers are bonafide CI gurus. Now that you are integrating your application code, test code, config files and deploy scripts, are you ready to take it to the next level? An increasing number of engineering shops are starting to bring the continuous integration discipline into their database development. Get smart with SQL Backup ProGet faster, smaller backups with integrated verification.Quickly and easily DBCC CHECKDB your backups. Learn more.

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