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• A Virtual Seat at the Architect&rsquo;s Table

  - by Bob Rhubart

  I always have fun producing the Arch2Arch podcasts, but the latest batch was all that and a bag of chips, since I was required to do absolutely no preparation and very little talking, and since the conversation was reminiscent of those I’ve had with various architects (you know who you are) in various watering holes: free-ranging, extemporaneous, and far, far from dull. The three most recent programs were recorded during a virtual mini meet-up of architects back in February.  You’ll find more detail here, but in a nutshell, I invited several previous Arch2Arch panelists to join me on Skype to talk about whatever was on their minds.  The resulting conversation yielded the three latest programs. Check them out – it’s like you’re sitting at the table. Listen to Part 1 Listen to Part 2 Listen to Part 3 The conversation begins with the participant’s responses to my challenge to fill in the blank in the sentence “Most conversations about Enterprise Architecture are too ____.” From there the conversation morphed into a discussion of the sheer joy of finding funding for architecture projects. The architects seated at the virtual table in these programs are:  Todd Biske, a veteran enterprise architect and the author of the book SOA Governace, from Packt Publishing. ( LinkedIn | Twitter | Blog | Oracle Mix ) Jordan Braunstein, an Oracle ACE Director and the Business Integration and Architecture Partner at TUSC. (Blog | Twitter | LinkedIn | Oracle Mix) Basheer Khan,  also an Oracle ACE Director, and the founder and CEO of Innowave Technology (Blog | LinkedIn | Twitter | Oracle Mix) Pat Shepherd, an enterprise architect with the Oracle Enterprise Solutions Group. (Oracle Mix | LinkedIn | Blog) Coming Soon I was so pleased with the results of this meet-up format that I did the same thing for the next series of programs.  These free-ranging conversations feature a different group of participants, covering a different set topics, including the fear of SOA, the misunderstanding and misinformation behind that fear, and the idea of beauty in architecture. Yeah, you read that right. So stay tuned: RSS   Technorati Tags: oracle,otn,enterprise architecture,podcast. arch2arch,meet-up del.icio.us Tags: oracle,otn,enterprise architecture,podcast. arch2arch,meet-up

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• Late feedback

  - by Sveta Smirnova

  MySQL Community team asked me to write about Devconf 2013 few months ago. Conference was in June, 2013, but I remembered about this my promise only now: month later after my participating in MySQL Connect and Expert Troubleshooting seminar (change country to United Kingdom if you see blank page). I think it is too late for the feedback, but I still have few thoughts which I want to record.DevConf (former PHPConf) always was a place where I tried new topics. At first, because I know audience there very well and they will be bored if I repeat a story which I was telling last year, but also because it is much easier to get feedback in your own native language. But last years my habit seems started to change and I presented improved version of my 2012 MySQL Connect talk about MySQL backups. Of course, I also had a seminar with unique topic, made for this conference first time: Troubleshooting MySQL Performance with EXPLAIN and Using Performance Schema to Troubleshoot MySQL. And these topics, improved, were presented at the expert seminar. It is interesting how my habit changes and one public speaking activity interferes next one.What is good about DevConf is it forces you to create new ideas and do it really well, because audience is not forgiving at all, so they catch everything you miss or prepared not good enough. This can be bad if you want to make a marketing-style topic for free, but allows to present technical features in really good details: all these sudden discussions really help.In year 2013 Oracle had a booth at the conference and was presented by a bunch of people. Dmitry Lenev presented topic "New features of replication in MySQL 5.6" and Victoria Reznichenko worked on the booth. What was new at the conference this year is greater interest in NoSQL, scale and fast development solutions. This, unfortunately, means not so huge interest in MySQL as it was earlier. However, at the same time, "Common" track was really MySQL track: not only Oracle, but people from other companies presented about it.

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• GUI based backup utility [closed]

  - by Chethan S.

  Possible Duplicate: Comparison of backup tools I have read favorable reviews for 'Back In Time' for the purpose stated above. Still I am posting this question as I have some demands in my mind. Few years back I was using ThinkVantage Rescue and Recovery by IBM on my Lenovo PC under Windows. That provided me nice features like compressed backups, boot time options - OS Repair, Restore entire OS, restore entire system to an older date, restore individual files etc. Out of these the feature I liked the most was compressed backups. Similar features are available in software like Norton Ghost too. In Back In Time I was surprised to see that the snapshot takes up same amount of space as that of the original contents, no compression at all. Furthermore, I was not able to find options to change the compression ratio etc. under settings. According to me compression of backups is a must have feature. Therefore, can anyone suggest me any other utility which can serve the purpose. I insist on GUI based tool since I don't want to mess up with backups!

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• JQueryMobile - Problems with dialog boxes [closed]

  - by Richard van Hees

  I'm programming in JQueryMobile, but I can't seem to get some things as I want. First it's good to tell I am mostly programming in a multi-page template. I have a login function in the web based app. The idea is that the user sees he's not logged in and the user can click on the button to log in. A dialog box pops up, in which the user can enter his credentials. This dialog box is in front of the previous page, in my case just index.php. The page for profile is at profile.php#profile. In this case the url for the dialog box is index.php#profile&ui-state=dialog. Don't ask me why, that's how JQueryMobile works, I guess. Anyway, after the user clicks on 'Login' in the pop-up, I want a new dialog to pop-up in which it says you are logged in and I want the content of the page behind it (index.php#profile) to refresh. Of course I want this all to move very smooth and no refreshing of the whole page, to prevent loading time and thus a blank screen for a second. In short: User not logged in Clicks on login Dialog pops up with form Clicks login New dialog pops up with 'success' (or whatever) in the same style as the previous dialog Clicks ok Page behind the dialogues has been refreshed without user noticing Also another thing that doesn't really work out for me: I can't seem to get a dialog to pop up, triggered by an action in another dialog. It just appears as a normal page.

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• Rendering 8 bit graphics

  - by Matjaz Muhic

  I have a strong programming background just not from game development. I only made some pong and snake in high school and I did some OpenGL in college. I want to make my own game engine. Nothing fancy just a simple 2D game engine. But because I'm kinda old school and feeling retro. I want graphics to look like old 8 bit games (megaman, contra, super mario, ...). So how were the old games made back then? I want the simplest approach. Were they also using assets (images) like newer engines now do? How do you achieve this kind of rendering using OpenGL? Keep in mind. Simplest solution. I want to know how it was made back then and how I can replicate that. Doesn't even have to be OpenGL. I can draw on window canvas. I do want to make it from scratch basically.

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• Package Manager cannot access repositories but internet is working

  - by kazman

  I am currently at a conference in another country and my package manager cannot access repositories. My internet is working fine and I can ping the repositories or go to them in a browser, but package manager fails to access them. If I sudo apt-get update it throws Something wicked happened resolving 'wwwproxy:3128' (-5 - No address associated with hostname) (or Ign's). This proxy corresponds to my proxy at my office back at home, but I have disabled proxy in the package manager. Scanning for best repository doesn't work either, it doesn't manage to connect to any. I have searched for this online and have checked things about my apt.conf file. My apt.conf contains: Acquire::http::proxy "http://wwwproxy:3128/"; Acquire::https::proxy "https://wwwproxy:3128/"; Acquire::ftp::proxy "ftp://wwwproxy:3128/"; Acquire::socks::proxy "socks://wwwproxy:3128/"; If I remove apt.conf (or replace with blank), it makes no difference. I don't see that it should since I am connecting directly (and have set it so in my network options in Package manager network settings) I have also tried some things with resolv.conf (changing name address to primary and secondary dns) to no avail. (im not sure if this would help, following other advice) I am running 12.04. (I wrote this very quickly and wrote down everything I have tried to possibly shorten the troubleshooting process, have very limited time between lectures and need this sorted asap, my apologies)

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• When using MVVM, should you create new viewmodels, or swap out the models?

  - by ConditionRacer

  Say I have a viewmodel like this: public class EmployeeViewModel { private EmployeeModel _model; public Color BackgroundColor { get; set; } public Name { get { return _model.Name; } set { _model.Name = value; NotifyPropertyChanged(Name); } } } So this viewmodel binds to a view that displays an employee. The thing to think about is, does this viewmodel represent an employee, or a "displayable" employee. The viewmodel contains some things that are view specific, for instance the background color. There can be many employees, but only one employee view. With this in mind, when changing the displayed employee, does it make sense to create a new EmployeeViewModel and rebind to the view, or simply swap out the EmployeeModel. Is the distinction even important, or is it a matter of style? I've always leaned toward creating new viewmodels, but I am working on a project where the viewmodels are created once and the models are swapped out. I'm not sure how I feel about this, though it seems to work fine.

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• Ternary and Artificial Intelligence

  - by user2957844

  Not much of a programmer myself, however I have been thinking about the future of AI. If a fully functional AI is programmed in a binary environment as is used in current computing, would that create a bit of a black and white personality? As in just yes/no, on/off, 1/0? I will use the Skynet computer from the Terminator series as a bad analogy; it is brought online and comes to the conclusion that humanity should just be destroyed so the problem is resolved, basically its only options were; fire the missiles or not. (The films do not really go into what its moves would be after doing such a thing, but that goes into the realms of AI evolution so does not really fit with this question.) It may also have been badly programmed. Now, the human mind has been akin to a ternary system which allows our "out of the box" thinking along with all the other wonderful things our minds can do. So, would it not be more prudent to create a functional ternary system and program an AI using it so the resulting personality would be able to benefit from the third "maybe" (so to speak) option? I understand that in binary there are ways to get around the whole yes/no etc. way of things, however the basic operations are still just 1's and 0's. Again with using the above bad Skynet analogy; if it could have had that third "maybe" option as part of its core system, it may have decided to not launch due to being able to make sense of the intricacies of human nature and the politics of such a move etc. In effect, my question is; Would an AI benefit more from ternary computing as opposed to binary due to the inclusion of -1, or 2, dependent on the system ("maybe," as I call it)?

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• Can I use a 302 redirect to serve up static content from an URL with escaped_fragment?

  - by Starfs

  We would like to serve up SEO-friendly Ajax-driven content. We are following this documentation. Has anyone ever tried to write a 302 redirect into the .htaccess file, that takes the ?_escaped_fragment= string and send that to a static page?, for example /snapshot/yourfilename/. How will Google react to this? I've gone through the documentation and it's not very clear. The below quote is from Google's documentation this is what I find. I'm not sure if they are saying that you can redirect the _escaped_fragment_ URL to a different static page, or if this is to redirect the hashtag URL to static content? Thoughts? From Google's site: Question: Can I use redirects to point the crawler at my static content? Redirects are okay to use, as long as they eventually get you to a page that's equivalent to what the user would see on the #! version of the page. This may be more convenient for some webmasters than serving up the content directly. If you choose this approach, please keep the following in mind: Compared to serving the content directly, using redirects will result in extra traffic because the crawler has to follow redirects to get the content. This will result in a somewhat higher number of fetches/second in crawl activity. Note that if you use a permanent (301) redirect, the url shown in our search results will typically be the target of the redirect, whereas if a temporary (302) redirect is used, we'll typically show the #! url in search results. Depending on how your site is set up, showing #! may produce a better user experience, because the user will be taken straight into the AJAX experience from the Google search results page. Clicking on a static page will take them to the static content, and they may experience avoidable extra page load time if the site later wants to switch them to the AJAX experience.

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• How to build an API on top of an existing Rails app with NodeJs and what architecture to use?

  - by javiayala

  The explanation I was recently hired by a company that has an old RoR 2.3 application with more than 100k users, a strong SEO strategy with more than 170k indexed urls, native android and ios applications and other custom-made mobile and web applications that rely on a not so good API from the same RoR app. They recently merged with a company from another country as an strategy to grow the business and the profit. They have almost the same stats, a similar strategy and mobile apps. We have just decided that we need to merge the data from both companies and to start a new app from scratch since the RoR app is to old and heavily patched and the app from the other company was built with a custom PHP framework without any documentation. The only good news is that both databases are in MySQL and have a similar structure. The challenge I need to build a new version that: can handle a lot of traffic, preserves the SEO strategies of both companies, serve 2 different domains, and have a strong API that can support legacy mobile apps from both companies and be ready for a new set of native apps. I want to use RoR 3.2 for the main web apps and NodeJs with a Restful API. I know that I need to be very careful with the mobile apps and handle multiple versions of the API. I also think that I need to create a service that can handle a lot IO request since the apps is heavily used to create orders for restaurants at a certain time of the day. The questions With all this in mind: What type of architecture do you recommend me to follow? What gems or node packages do you think will work the best? How do I build a new rails app and keep using the same database structure? Should I use NodeJS to build an API or just build a new service with Ruby? I know that I'm asking to much from you guys, but please help me by answering any topic that you can or by pointing me on the right direction. All your comments and feedback will be extremely appreciated! Thanks!

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• OpenGL : sluggish performance in extracting texture from GPU

  - by Cyan

  I'm currently working on an algorithm which creates a texture within a render buffer. The operations are pretty complex, but for the GPU this is a simple task, done very quickly. The problem is that, after creating the texture, i would like to save it. This requires to extract it from GPU memory. For this operation, i'm using glGetTexImage(). It works, but the performance is sluggish. No, i mean even slower than that. For example, an 8MB texture (uncompressed) requires 3 seconds (yes, seconds) to be extracted. That's mind puzzling. I'm almost wondering if my graphic card is connected by a serial link... Well, anyway, i've looked around, and found some people complaining about the same, but no working solution so far. The most promising advise was to "extract data in the native format of the GPU". Which i've tried and tried, but failed so far. Edit : by moving the call to glGetTexImage() in a different place, the speed has been a bit improved for the most dramatic samples : looking again at the 8MB texture, it knows requires 500ms, instead of 3sec. It's better, but still much too slow. Smaller texture sizes were not affected by the change (typical timing remained into the 60-80ms range). Using glFinish() didn't help either. Note that, if i call glFinish() (without glGetTexImage), i'm getting a fixed 16ms result, whatever the texture size or complexity. It really looks like the timing for a frame at 60fps. The timing is measured for the full rendering + saving sequence. The call to glGetTexImage() alone does not really matter. That being said, it is this call which changes the performance. And yes, of course, as stated at the beginning, the texture is "created into the GPU", hence the need to save it.

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• Do we ethically have the right to use the MAC Address for verification purposes?

  - by Matt Ridge

  I am writing a program, or starting at the very beginning of it, and I am thinking of purchase verification systems as a final step. I will be catering to Macs, PCs, and possibly Linux if all is said and done. I will also be programming this for smartphones as well using C++ and Objective-C. (I am writing a blueprint before going head first into it) That being said, I am not asking for help on doing it yet, but what I’m looking for is a realistic measurement for what could be expected as a viable and ethical option for purchase verification systems. Apple through the Apple Store, and some other stores out there have their own "You bought it" check. I am looking to use a three prong verification system. Email/password 16 to 32 character serial number using alpha/numeric and symbols with Upper and lowercase variants. MAC Address. The first two are in my mind ok, but I have to ask on an ethical standpoint, is a MAC Address to lock the software to said hardware unethical, or is it smart? I understand if an Ethernet card changes if not part of the logic board, or if the logic board changes so does the MAC address, so if that changes it will have to be re-verified, but I have to ask with how everything is today... Is it ethical to actually use the MAC address as a validation key or no? Should I be forward with this kind of verification system or should I keep it hidden as a secret? Yes I know hackers and others will find ways of knowing what I am doing, but in reality this is why I am asking. I know no verification is foolproof, but making it so that its harder to break is something I've always been interested in, and learning how to program is bringing up these questions, because I don't want to assume one thing and find out it's not really accepted in the programming world as a "you shouldn't do that" maneuver... Thanks in advance... I know this is my first programming question, but I am just learning how to program, and I am just making sure I'm not breaking some ethical programmer credo I shouldn't...

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• Limiting my heavy thinking to my job [closed]

  - by Robin Castlin

  This might be a weird problem which is only to a half relevant to actual programming, but hopefully there are people here that knows what I'm talking about. Basicly I'm proud of how I can deal with coding problems and fix them in short notice and many other aspects like building new systems and such. I'm fast on finding solutions and I often think about the impact my changes does to existing systems and so on, therefor preventing problem from arising at all and such. I am simply happy with how my mind operates when it comes to programming and I wouldn't want to change it at all. The problem, however is when I'm not programming. I find myself rather limited in social situations. I can't determine if it is through programming, but I sometimes think way to much about the consequences when it comes to being social. I know from own experience that most times you earn by not thinking about consequences, but it's hard for me not to. Often my friends tells me "I think too much" and even though I agree, I can't seem to change this behavior. My brain wants to think, and it likes to overthink simple stuff. Does anyone recognize the bad habit of not leaving advanced thinking at work, and in what way do you deal with it? If this isn't a suitable place to ask this question, I apologize and hope you may point me to the right site.

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• What to do if you find a vulnerability in a competitor's site?

  - by user17610

  While working on a project for my company, I needed to build functionality that allows users to import/export data to/from our competitor's site. While doing this, I discovered a very serious security exploit that could, in short, perform any script on the competitor's website. My natural feeling is to report the issue to them in the spirit of good-will. Exploiting the issue to gain advantage crossed my mind, but I don't want to go down that path. So my question is, would you report a serious vulnerability to your direct competition, in order to help them? Or would you keep your mouth shut? Is there a better way of going about this, perhaps to gain at least some advantage from the fact that I'm helping them by reporting the issue? Update (Clarification): Thanks for all your feedback so far, I appreciate it. Would your answers change if I were to add that the competition in question is a behemoth in the market (hundreds of employees in several continents), and my company only started a few weeks ago (three employees)? It goes without saying, they most definitely will not remember us, and if anything, only realize that their site needs work (which is why we entered this market in the first place). I confess this is one of those moral vs. business toss-ups, but I appreciate all the advice.

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• I just received a complaint from a user of the website I maintain. Should I do anything?

  - by Chris

  I was sent sent a large wall of text from a user of the website I maintain at my job. They are clearly upset for having to deal with a horribly outdated web application that has not seen any serious updates in over 6+ years. No refactoring has been done, the code quality is terrible, the security unchecked, policy compliances ignored, in addition to being ugly and frankly embarrassing. Keep in mind this is a small business but the website is used by hundreds daily. I'm one of two programmers there, and I've been working there for two years. This person says they are about my age (22) and understand technology (but can't use proper grammar). The complaint mentioned awkward pages and actions on the website, but they don't even have a clue as to the depth of the flaws in this website. Now, I would love to honestly tell them that there's a lot wrong with this company and that this application was built when we were in high school. And that while it's not my fault that the website is terrible, I'm the one in position to fix it. But on the other hand, I could just say nothing and ignore it. Would doing this publicly have any advantage to future employees (showing integrity) or would it just be a completely pointless mistake? Odds are, even if I respond only that one person will ever read it. Regardless, I'm probably just going to ignore it and continue starting my project to refactor the website.

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• Why have we got so many Linux distributions? [closed]

  - by nebukadnezzar

  Pointed to from an answer to another question, I came across this graphic, and I'm shocked how many linux distributions currently exist. However, it seems that most of these distributions are forks of already popular distributions with minimal changes, usually limited to themes, wallpapers and buttons. It would still seem easier to create a sub-distribution with the required changes, such as XUbuntu with XFCE4, KUbuntu with KDE4, Fluxbuntu with Fluxbox, etc. In my mind there are a number of problems with having so many distributions - perhaps less security/stability due to smaller group of developers, and also the confusingly vast range of choice for newcomers to Linux. Some reasons that developers might decide to fork are: Specializing on a particular topic (work-related topic - i.e. for a Hospital, etc) An exceptional architecture, that requires a special set of software Use of non-FOSS, proprietary technology, and such So what other reasons are there that have caused so many people decided to create their own distributions? What are the thought processes that have led to this? And are these "valid" reasons - do we need so many distributions? If you can back your experiences up with references that would be great.

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• When is it too late to go back to coding from a management role? [closed]

  - by LeoLambrettra

  Problem solving keeps the mind sharp and if you are like me then it makes you happy. But what if you went from coding up to Team Lead and then to Project Manager? I have a team of 12 and on a good salary but lately have been thinking that the politics and admin tasks of being middle level management in an Investment Bank is not the right path to happiness. I used to be able to design and code as well as manage but lately it's all budgets, admin tasks and people problems. At 39 is it too late to go be a senior developer again? Basically - Team Lead in a flat structure with good people rocks. But if half your team is offshore then it loses something - There's a lot of politics in Project Management and so many meetings that even if you want to code you start letting your team down by missing deadlines and only suited for small units of work The coding skills haven't gone so to pick up WCF services it just takes a bit of reading and then playing around. I reckon I could switch to a Hedge Fund and go back to developing and be far happier and get more money. My 2 doubts though are 1. Mid life crisis in that I'd get bored with coding again 2. Or maybe I'd like it but there aren't many dev jobs for 40+ so I'd be throwing away a high level management role that took 7 years at thee one bank to get to0 Anybody else made to switch back and survived?

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• Dealing with under performing co-worker

  - by PSU_Kardi

  I'm going to try to keep this topic as generic as I can so the question isn't closed as too specific or whatever. Anyway, let's get to it. I currently work on a somewhat small project with 15-20 developers. We recently hired a few new people because we had the hours and it synched up well with the schedule. It was refreshing to see hiring done this way and not just throwing hours & employees at a problem. Alas, I could argue the hiring process still isn't perfect but that's another story for another day. Anyway, one of these developers is really under performing. The developer is green and has a lot of bad habits. Comes in later than I do and leaving earlier than I am. This in and of itself isn't an issue, but the lack of quality work makes it become a bit frustrating. When giving out tasking the question is no longer, what can realistically be given but now becomes - How much of the work will we have to redo? So as the project goes on, I'm afraid this might cause issues with the schedule. The schedule could have been defined as a bit aggressive; however, given that this person is under performing it now in my mind goes from aggressive to potentially chaotic. Yes, one person shouldn't make or break a schedule and that in and of itself is an issue too but please let's ignore that for right now. What's the best way to deal with this? I'm not the boss, I'm not the project lead but I've been around for a while now and am not sure how to proceed. Complaining to management comes across as childish and doing nothing seems wrong. I'll ask the community for insight/advice/suggestions.

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• Photos being copied all over the place

  - by plua

  We have a rather popular website with plenty of photos. Our whole business depends on our content - and the photos are important in this. We invest a lot of time, effort, and money into taking these pictures. On our website we have clear copyright notices, we have the website name and logo in the photos, and we have a Photo Licensing page which states the prices of licensing our photos. Despite all this, our photos are copied by personal and commercial websites alike. We really want to do something about this. We do not want them to take out the photos and leave it at that. We want them to pay for the usage, as we clearly state on our website. Now a few questions come to mind: Can we legally force them to pay right away? Or are we obligated to first write a "Cease and Desist" letter? Photos are used on websites throughout the world. Are there any worldwide rules for this? Has anybody experience with doing these things outside of their home country? Should we hire a lawyer in any country? Or could a local lawyer contact oversees companies directly?

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• Solutions for "Maintenance Mode"

  - by Ka Lyse

  Given a web application running across 10+ servers, what techniques have you put in place for doing things like altering the state of your website so that you can implement certain features. For instance, you might want to: Restrict Logins/Disable Certain Features Turn Site to "Read Only" Turn Site to Single "Maintenance Mode" page. Doing any of the above is pretty trivial. You can throw a particular "flag" in an .ini file, or add a row/value to a site_options table in your database and just read that value and do the appropriate thing. But these solutions have their problems. Disadvantages/Problems For instance, if you use a file for your application, and you want to switch off a certain feature temporarily, then you need to update this file on all servers. So then you might want to look at running something like ZooKeeper, but you are probably overcomplicating things. So then, you might decide that you want to store these "feature" flags in a database. But then you are obviously adding unncessary queries to each page request. So you think to yourself, that you will throw memcached in to the mix and just cache the query. Then you just retrieve all of your "Features" from memcached and add a 2ms~ latency to your application on every page. So to get around this, you decide to use a two tier-cache system, whereby you use an inmemory cache on each machine, (like Apc/Redis etc). This would work, but then it gets complicated, because you would have to set the key/hash life to perhaps 60 seconds, so that when you purge/invalidate the memcached object storing your "Features" result, your on machine cache is prompt enough to get the the new states. What suggestions might you have? Keeping in mind that optimization/efficiency is the priority here.

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• error/message: the disk drive for /home is not ready... when connecting an external hard drive

  - by seallussus

  i am running Ubuntu 10.04 all updated installed to date (3/28/2012) and when i connect another sata HD i get this message the disk drive for /home is not ready yet or not present continue to wait, or press S to skip mounting or M for manual recovery so i press S but i get this message could not update ICEauthority file /home/username/.ICEauthority And when a press close i get this there is a problem with the configuration server (/usr/libconf2-4/gconf-sanity-check-2 exited with status 256) And when a press close i get message Nautilus could not create the following required folders :/home/username/desktop,/home/username/.Nautilus before running Nautilus, please create these folders or set permissons such that Nautilus can reach them And finally when a press Ok at the last message it disappears and i get a blank screen with a lot of colors on it and with nothing else so i shutdown (power button ) and disconnect the HD and boot without problems so how to fix this in simple commands because i am a total Linux noob notes -In the original error my username was in place of username i wrote (did not want to confuse anybody ) -I tried searching for this problem but a got a lot of different answers and most of them were really complicated to me and not working -I got a data HD connected and working without problems also the HD i installed Ubuntu on is Sata (maybe it helps) -Apologize for me bad English its not my mother language

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• What technologies are needed to be a freelance web developer / designer targeting small businesses?

  - by Jason Wirth

  First off, I'm not looking for this answer: "learn PHP/MySQL, JQuery, HTML/CSS...." My background, I wear many hats, and do many things. Currently I manage investment accounts with a business partner who is also a friend. He happens to be attending business / law school perusing a joint JD and MBA. As a result, we're putting our into "coast", maintaining our current clients, but not acquiring more. Recently I've picked up some freelance graphic design / web development / online marketing side work (Photoshop, HTML/CSS, WordPress) through some personal networks. The work is enjoyable; now I'm thinking about expanding it into a larger business with these primary goals: augment my finances (I'm shooting for about $1,000-2,000 per mo.), learn new technologies, involve myself with meaningful work. As an entrepreneur I don't mind the aspects of running a business that hassle other freelancers... -- the marketing -- the billing -- etc. I'm considering targeting the small to middle market businesses and organizations where I can contribute in marketing, design, and development building projects from the ground up. Thus I'll have freedom to decide the specific technology (I won't have to work with an existing code base). What kinds of projects should I focus on? What technologies are a good fit for this style of work? For example: It might be fun to develop with Ruby on Rails. However, maybe a lot of projects would be rolling out e-commerce solutions. Thus, I should focus on PHP due to more shopping cart options, skipping ROR entirely.

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• More Tables or More Databases?

  - by BuckWoody

  I got an e-mail from someone that has an interesting situation. He has 15,000 customers, and he asks if he should have a database for their data per customer. Without a LOT more data it’s impossible to say, of course, but there are some general concepts to keep in mind. Whenever you’re segmenting data, it’s all about boundary choices. You have not only boundaries around how big the data will get, but things like how many objects (tables, stored procedures and so on) that will be involved, if there are any cross-sections of data (do they share location or product information) and – very important – what are the security requirements? From the answer to these types of questions, you now have the choice of making multiple tables in a single database, or using multiple databases. A database carries some overhead – it needs a certain amount of memory for locking and so on. But it has a very clean boundary – everything from objects to security can be kept apart. Having multiple users in the same database is possible as well, using things like a Schema. But keeping 15,000 schemas can be challenging as well. My recommendation in complex situations like this is similar to a post on decisions that I did earlier – I lay out the choices on a spreadsheet in rows, and then my requirements at the top in the columns. I  give each choice a number based on how well it meets each requirement. At the end, the highest number wins. And many times it’s a mix – perhaps this person could segment customers into larger regions or districts or products, in a database. Within that database might be multiple schemas for the customers. Of course, he needs to query across all customers, that becomes another requirement. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• F# &ndash; Converting your C# brain to the F# way

  - by MarkPearl

  My brain still thinks in C#!!! I have been looking at F# and trying to figure out the basics of it, but all the time in the back of my mind I am going – what is the C# equivalent to this or that… It’s frustrating because I almost want a F# to C# dictionary the whole time – and simply translate my C# code to F# – which would negate the main motivation for learning F# – as I want learn functional programming - if I was simply doing C# code in a F# syntax I would be gaining nothing! So I am experiencing pain while my brain forms some new neural networks… but luckily I live in a country where we have 11 official spoken languages, and plenty more unofficial languages so I have gone through the pain of learning how to speak a new language before – and I am finding the process is almost identical in learning a programming language that promotes a different way of looking at problems (from Object Orientated to Functional). That beings said… the first thing to learn is the basic syntax… I have searched the web for appropriate places to get a translation – and have been quite disappointed with what is out there for F#. Luckily, OCaml came to the rescue. There are some really good tutorials on getting started with OCaml syntax, one in particular that stood out was the OCamal-Tutorial. What I particularly like about it is that it is doing comparisons between C based languages and OCaml. Give it a read sometime – it’s well worth it and has definitely helped me understand F# a little better.

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• WUBI installation can no longer boot, UUID disk not found

  - by Joel Heenan

  Yesterday my Wubi/Vista installation was working fine. I shut it down at the train station, all good then when I attempted to boot ubuntu at home I got a message saying the UUID for root could not be found. By booting with the Ubuntu live CD I found that the C:\ubuntu\disks folder stat structure was broken, reported as "??? ??? ??" kinda thing. I booted into Windows, scheduled a CHKDSK, ran that on boot which found some errors and rebooted. Still no dice. I am not stressed because it appears my home directory is still there with all my content so I don't mind re-installing the OS (probably will clean it up some). What is the best path from here to repair the WUBI installation? Is there anything else I should do to repair it? I'm looking at whether the drive is dying now to work out why this occured. Possibly I moved the laptop before shutdown had completed.

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