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• Is a blob more efficient than a varchar for data that can be ANY size?

  - by BillyNair

  When setting up a database I want to use the most efficient data type for potentially fairly long data. Currently my project is to store song titles and thoughts pertaining to that song. Some titles might be 5 characters or longer than 100 characters and the thoughts could run pretty long. Is it more efficient to use a varchar set to 8000 or to use a blob? Is using a blob the same as a varchar, in that there is a set size it is allocated regardless of what it holds? or is it just a pointer and it doesn't really use much space on the table? Is there a certain set size of a blob in KB or is it expandable?

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• updating from 8.04 to a newer version?

  - by user175802

  I have an old system. It doesn't have a DVD drive, and I think the cd drive is a bit wonky. The only disk that I have been able to get to install is an old (official) 8.04 Kubuntu disk. No disk that I've burned on a few systems works. They check out, but they don't seem to survive the install (another issue). I thought once I got a version on that I could update over the web, but no luck. It appears EOL. No updates seem to be available, or software to install. Is there a way? I'd like to get it to as new a version as possible. The next step would be to pull the drive and get a new one, but I'd rather not.

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• Should I be concerned about hAtom tags on my blog?

  - by Sid

  I am using a theme that automatically adds hatom-entry, hatom-feed classes on my WordPress blog. I read that such tags/classes should be used for syndicated content. Anyway, then I ran a Rich Snippet Tool, which threw a "HAtomfeed" error. So I removed a "hfeed" div tag. Now, should I be concerned? Can this cause any problems? I still have a couple of these classes (listed below), and I just hope they do not effect my site's ranking. For now, these are the tags the Rich Snippet Tool has detected: hatom-feed hatom-entry: entry-title: entry-content: published: author: fn: person-name: url: Appreciate your help! Edit: All the content on this weblog is unique and written by me and others. Thought I'd share that.

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• Triggering State Changes with Health Counter

  - by Hairgami_Master

  I'm developing a game where the player changes states as their health decreases. Below 50, it should trigger animation1. Below 30, it should trigger animation2. The problem is, I only want to trigger animation1 once. But my game timer is checking every "frame", so it's triggering animation1 every cycle below 50. I only want it to trigger once, then not again until it's gone over 50 and then naturally decreased back to below 50. Are there any tried and true strategies for triggering state changes as a timer counts down (without the over-triggering problem)? I thought I could say: if (health == 50) animation1.play(); but sometimes, health never equals exactly 50, so it will skip right past that statement.

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• Microsoft Releases Windows Server 2012

  Windows Server 2012 offers expanded virtualization capabilities and works with Windows Azure, the software company's cloud platform. It can deliver more than 200 public, private and hybrid cloud services. The goal seems to be to deliver any application on any cloud. Rand Morimoto, president of Microsoft partner Convergent Computing, sees a number of major selling points for Windows Server 2012. For instance, its deduplication features can save a company 40 to 50 percent in storage space. Its automated IT management capabilities enable it to manage a large number of virtual machines. It can eve...

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• /usr/src is eating up all inodes

  - by klingone

  it seems /usr/src (apparently old kernels) used up all my inodes Dateisystem Inodes IBenutzt IFrei IUse% Eingehängt auf /dev/sda4 489600 489600 0 100% / devtmpfs 219658 539 219119 1% /dev none 219844 474 219370 1% /run none 219844 3 219841 1% /run/lock none 219844 8 219836 1% /run/shm /dev/sda6 5963776 8361 5955415 1% /home tried everything to remove/purge etc. the old kernels, without success.. dpkg is not working anymore, tried a few manual commands but 12.04 gives me nothing. apt-get etc. is not possible due to lack of space on the hard drive...which is not the problem obviously. however cannot install/ remove anything! read a lot about users with the same problem, but their solutions are not working for me. Anyone out there who could help? thanks a lot!

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• Why does Ubuntu Freezes on ASUS K42DY laptop with RADEON HD6470M Graphics Card?

  - by ix3

  Hi,I have an ASUS K42DY laptop with AMD Phenom II x2, 8 GB Ram , 500 GB Hard Drive and has a didicated ATI RADEON HD 6470M Graphics Card and I'm running Ubuntu 12.04 LTS 64bit on it. I have installed GNOME 3 and also followed this Make Ubuntu look like Mac OS X. I have also installed apps from the software center, getdeb & playdeb all of which worked fine. However, I noticed that Ubuntu freezes after inactivity let's say 1-3hrs. I have already set power setting to never standby or hibernate. This is completely annoying because all I can do is log-out via ctrl+alt+del or manually shut down and reboot my laptop. What should I do? By the way, this happens on all shells Unity, Gnome (even with the basic) and Cairo Dock.I set Swap Space at 8GB during installation. Any help will be appreciated. Thanks!

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• Hide from google while developing

  - by user210757

  I will be building a (wordpress) web site. While I am developing, other team members will be pushing content. I'd like to have it hidden from google while under development. It will be hosted on godaddy. I have thought of not pointing the domain name to it until live and using "preview dns", or buying a static IP during development. Or hosting dev site in a sub-directory ("/dev/") until ready and then moving it up a level. If in the dev directory I'd add htaccess or robots.txt to not crawl. Is any of this a bad idea? Will google penalize for any of this - like search by IP and then associate that with the domain later on? Any better ideas?

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• How to deal with OOP design problems in interviews?

  - by haps10

  This is a question where I seek guidance from fellow/senior developers to get into my dream company - it's a pioneer in OOP and Agile. I've already failed once to clear an interview. One part I feel most challenging is to come up with a proper Object Oriented design(classes, interfaces, methods, interactions etc.) in a very short time for certain situations like Pacman, Game Of Life and so on. As the problems are unprecedented ones - my approach is mostly to try different things and then make decisions - which they feel is not clear and not what they expect from a developer with 5+ years of experience. I've already studied a few books on patterns, OOP - it didn't help me much and I think it'll take a bit more than that. Could some one please guide on what specifically shall I practice so that I can do better at design problems as above. I want to refine my approach and have a better thought process.

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• Problems increasing root size

  - by user212866

  I'm running out of space, so I tried to increase root size using this link: Increase size of root partition after installing Ubuntu in Windows Here is the output Filesystem Type Size Used Avail Use% Mounted on /dev/sda7 ext4 6,2G 5,6G 308M 95% / udev devtmpfs 965M 4,0K 965M 1% /dev tmpfs tmpfs 389M 892K 388M 1% /run none tmpfs 5,0M 4,0K 5,0M 1% /run/lock none tmpfs 972M 440K 971M 1% /run/shm /dev/sda5 fuseblk 12G 6,1G 5,8G 52% /media/Ubuntu /dev/sda2 fuseblk 278G 260G 19G 94% /media/AC4CC70D4CC6D16E I tried to allocate 16Gb in the host (/dev/sda2 which is windows 7 partition). When I get to the \ubuntu\disks folder, I only get the "new.disk" file which weighs the 16Gb allocated and not the "root.disk" file too. Also, the /dev/sda7 size doesn't increase. Could you please help me? Many thanks

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• As good as no bounces are registered in Google Analytics [on hold]

  - by user29931

  For a client I am having an issue for which I can't find an explanation. For some reason, bounces are no longer measured (or almost none) in GA. In GA I can see that the issue started in January 2013. I have been looking at the code inside and out, but I can't find any reason why. On the production site, there is (will be removed soon) a POST done on page load, so I thought that Google might see this as user interaction, hence never counting a bounce, but on staging i removed this POST and in the GA account for staging, still no bounces are registered. I have also checked if the tracking code appears twice on the page, and this is not the case. I tried with the GA debug plugin in Firefox and Chrome to see if that would learn me anything, but no luck... The site in question is www.kiala.be.

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• Dual Boot not recognizing new hard drive

  - by Grove

  I am a complete Linux newb..which will become obvious shortly. The story: I wanted to dual boot with Ubuntu. I already had windows on 1 hard drive (320gb), and I wanted Ubuntu on a 2nd hard drive (2tb). I setup the partitions using the "Something else" option - I left the first hard drive alone, and put a swap and a ext4 partition on the 2nd hard drive. When it asked me where the bootable device was, I put the first hard drive. The problem: Now that Ubuntu is installed and grub lets me pick which os to boot to, I boot to ubuntu JUST FINE. BUT when I go to the home folder and look at devices, the only drive showing is the 320 gb/old hard drive that windows was installed on. I can not see the 2 TB hard drive anywhere. This is strange because I setup the Ubuntu partition to be the 2 TB hard drive and I thought I installed ubunto on that partition. Thank you for your time and patience :)

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• Rendering trillions of "atoms" instead of polygons?

  - by Baring

  I just saw a video about what the publishers call the "next major step after the invention of 3D". According to the person speaking in it, they use a huge amount of atoms grouped into clouds instead of polygons, to reach a level of unlimited detail. They tried their best to make the video understandable for persons with no knowledge of any rendering techniques, and therefore or for other purposes left out all details of how their engine works. The level of detail in their video does look quite impressive to me. How is it possible to render scenes using custom atoms instead of polygons on current hardware? (Speed, memory-wise) If this is real, why has nobody else even thought about it so far? I'm, as an OpenGL developer, really baffled by this and would really like to hear what experts have to say. Therefore I also don't want this to look like a cheap advert and will include the link to the video only if requested, in the comments section.

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• Wireless connectivity Wifi 7260 on Ubuntu 10.04

  - by user292332

  I am trying to install Wireless networking on Dell Latitude E5440 Wifi 7260- Ubuntu 10.04.(Yes I know it is old- see the complication below) I did get the wired connection working but our classrooms are wireless. I have tried to upgrade to version 12 last year but to my horror during the first week of class the nfs mounts did not work for multiple users. I never thought to test for more then one person at at time!! I have not been able to find a fix for the upgrade so I must remain at 10.04. NFS mounts are a must for student home directory access on the servers. All desktops are 10.04 as are the servers. Does anyone have a solution to the wireless problem in version 10.04/ or the nfs mounts solution in version 12. Thank you so much. Val

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• Ubuntu Windows Installer - Firewall

  - by Max

  I installed Ubuntu with the Windows installer to use it along side. I could not find anything to activate a firewall so I thought its inbuilt and running. However now I read that I have to activate it manually? The command that was shown actually didnt promt any repsonse. Is it that the Windows installer version does not have that. Also my greatest concern is that I was without firewall protection for 2-3 weeks and I am using alot of public networks (university and dorm(only cable but still)). Thanks in advance.

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• How do I install Ubuntu on a second hard drive?

  - by Keith454

  I am going to be buying a second hard drive for my desktop here pretty soon, because my current hard drive is a piece of junk running windows 7. What I want to know is how to install Ubuntu on the second drive. I am looking for a non complicated answer as I am not familiar with the Ubuntu lingo. I am so sick of Windows.. I used Ubuntu before but it didn't work properly. When i installed it, it said I didn't have enough space... Even tho I had 600GB to use. Anyway if anyone can help me out it would be much appreciated. Thanks

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• Java and Eclipse setup properly, how do I install JOGL or LWJGL?

  - by shadowprotocol

  I have my Java environment installed alongside Eclipse, and I was successfully able to create and run a new project (simple System.out.println("Yay I work!"); I have the OpenGL SuperBible, and I primarily want to code 3D things (I'll take my time using the book to learn how to draw shapes in 3D space, etc..) Can you help me get setup with OpenGL in Java? I dont really need LWJGL, although I WILL make games eventually. I just can't even figure out with all of these terrible (and old) tutorials floating around on the net how to install either JOGL or LWJGL. If you can give me a hand with that, I'd appreciate it. I'd like to feel I contributed by having this page show the answer to the question, so that other poor souls googling for this same information can benefit.

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• 13.10 suspend kills wifi

  - by ser

  i tried to post to this thread Hardware wireless switch has no effect after suspend and 13.10 upgrade for if i understand their question i am having the same problem but the answer option won't work for me and maybe i am not supposed to post there anyway, i dunno lol...ack when i come out of suspend, the wireless is disconnected with the only way to get it to reinitialize/be recognized is to do a full restart. at first i thought it was my gnome shell (for lock screen disappeared there with 13.10) but when i switched to the default ubuntu it's still doing it and it's kinda driving me nuts for i have to reopen all my files and browsers/tabs/windows everytime. i'm only a geekling so i don't know how to show the terminal stuff the above asker shows, but it sounds like the same issue and it only started with 13.10 upgrade a few days ago. any help would be much appreciated!!! thanks so much ser

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• Default Location of Web Site Content

  - by RichyL

  I am looking to install mediawiki on a production server (after doing a test on a development one). I could not really understand why the default location for the mediawiki files is /var/lib/mediawiki. I would have thought /var/www would've made more sense. I did some research and in http://people.canonical.com/~cjwatson/ubuntu-policy/policy.html/ch-customized-programs.html#s-web-appl it says the following Web Document Root Web Applications should try to avoid storing files in the Web Document Root. Instead they should use the /usr/share/doc/package directory for documents and register the Web Application via the doc-base package. If access to the web document root is unavoidable then use /var/www Can anyone explain why this is please?

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• get_hosts script being ignored in LTSP setup on Ubuntu 12.04

  - by Shwetav

  We had a home-grown LTSP load-balancer based on LDM_SERVER and get_hosts in Ubuntu 10.04. After upgrading to Ubuntu 12.04, everything worked fine except that get_hosts is being ignored completely. If we put space delimited list of servers as LDM_SERVER in lts.conf, users can choose a server during login and things work fine. Tried both locations below without any luck so far: 1. /var/lib/tftpboot/ltsp/i386/get_hosts 2. /opt/ltsp/i386/etc/get_hosts Any pointers would be greatly appreciated.

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• C# 5 - asynch method callback with Task.ContinueWIth? [migrated]

  - by user1142433

  I have a method that pulls some HTML via the HttpClient like so: public static HttpClient web = new HttpClient(); public static async Task<string> GetHTMLDataAsync(string url) { string responseBodyAsText = ""; try { HttpResponseMessage response = await web.GetAsync(url); response.EnsureSuccessStatusCode(); responseBodyAsText = await response.Content.ReadAsStringAsync(); } catch (Exception e) { // Error handling } return responseBodyAsText; } I have another method that looks like so: private void HtmlReadComplete(string data) { // do something with the data } I would like to be able to call GetHTMLDataAsync and then have it call HtmlReadComplete on the UI thread when the html has been read. I naively thought this could somehow be done with something that looks like GetHTMLDataAsync(url).ContinueWith(HtmlReadComplete); But, I can't get the syntax correct, nor am I even sure that's the appropriate way to handle it. Thanks in advance!

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• Limitation of high level languages? [closed]

  - by user1705796

  My question may look bit philosophical and nonsense! But I need to know kind of instructions those are not well suitable in high level languages even in c? Or rarely use in the development of software? Like read/write content of CPU registers may useful in debugging programs. And access to cache memory required when developing OS (maybe I am wrong at this point). Is this kind of instruction available languages like Java, Python, C? I also have a second question: And Why all high level languages not having same uniform syntax; at-least same standard library interface name? In python there is and. Or operator is almost same as && and ||. I think Python is developed after C but space indentation is compulsory in Python. Why Python does not use brackets {}. I already know this question going to be highly down-voted.

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• Connect divs with (non-straight) lines [migrated]

  - by Snailer

  I'd like to develop my site with a layout that looks somewhat like houses with connected plumbing, or multiple computers connected to a network. Basically, the will be boxes floating in space, with lines connecting some of the boxes. I'd like these lines to have some turns in them as well (just simple 90 degree corners) rather than just a straight line. My question is what is the best way to achieve this, and perhaps a small example. My thoughts were to use: PHP and CSS: I could create a background grid and then, with some complicated algorithms, draw paths using the grid's borders. This would be more dynamic, but I'm not sure I can plot the math all by myself. just CSS: Perhaps this is as simple as making some pre-drawn lines like L-shapes and T-junctions, then just placing and scaling them. But I don't believe there's a way to scale an image by slicing it.. so the line width would be scaled and thus each image would look different. Any thoughts?

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• Make recovery disk for customers

  - by alexander7567

  I hear about other computer shops that sells customers recovery disks that they have created. I'm assuming all that they do is make a image and uses an automation script that allows this to be done. I have seen where clonezilla does this, but it has to be the same HDD size or they might have problems down the road. Is there any other freeware that I could do this with that allows you to use on any size disk. Ghost is really good for this because it automatically fills up empty space with the partition and never needs any user input or "Expert Mode" like clonezilla. But it is not freeware.

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• Which technologies will most affect Financial Services over the next decade? [on hold]

  - by opposite of you

  I couldn't quite think of a proper description, so as Wikipedia puts it so beautifully: Financial services are the economic services provided by the finance industry, which encompasses a broad range of organizations that manage money, including credit unions, banks, credit card companies, insurance companies, consumer finance companies, stock brokerages, investment funds and some government sponsored enterprises. These are quite a range of industries. I've already thought about how banks specifically have gotten involved with app markets allowing users to make transfers on the go, and this goes with cloud computing, but what else could there be apart from mobile technologies and cloud computing? Or how else could they be used? I feel like I'm thinking about this wrong.. Apart from mobile computing and cloud computing, what other examples will influence the sector either positively or negatively?

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