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Articles indexed in June 2014

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  • Stairway to SQLCLR Level 3: Security (General and SAFE Assemblies)

    In the third level of our Stairway to SQLCLR, we look at the various mechanisms in place to help us control Security. In this Level we will focus on SAFE mode and see how secure SQLCLR is by default. Free eBook - Performance Tuning with DMVsThis free eBook provides you with the core techniques and scripts to monitor your query execution, index usage, session and transaction activity, disk IO, and more. Download the free eBook.

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  • Cloning existing software for commercial purposes - legal implications

    - by user2036256
    I have been asked to clone some existing software for a company. Basically its an old 16 bit DOS console app, which was supplied free of charge in I believe the late 80's. Having replaced the machine that needs to run it with a box running Win7 x64 they can't get it to work. It crashes every couple of minutes under DOSbox. The company that supplied it appears to no longer exist - if they did the company asking me to do this would almost certainly know about it. Its undetermined whether they have gone entirely or are just trading under a different name. If the latter they seem to have withdrawn from the market related to this product (because again, niche area, we should know about everyone there). What is the status to this with regards to copyright etc.? The main concern for the company involved is they want an identical interface to what they already have so I would have to clone this entirely. Having no source code / indication of the underlying mechanisms these would be written from scratch. Is an interface covered by copyright? / Does that still hold 30 years later? What is the assumed license when none at all is provided? Under UK law would I be under any serious risk were I to take on the project? How would this pan out if I then decided to sell the software on to other companies? Thanks

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  • Do hiring managers have a hard time accepting developers who have a "business look alike" personal app but are NOT entrepreneurs?

    - by shadesco
    Directly post graduation from University, I decided to build my own web app (Ease My Day) while waiting to get a job as a software Engineer. The reasons to build this app: Gain solid hands on software experience before hitting the job scene Providing a solution to a common problem Not sitting doing nothing while searching for jobs The app is Not an entrepreneurial tryout nor a business to be sold. Still throughout interviews I noticed that at the rate of 4 of each 5 interviews I pass through the app is being confused with a business and I am asked the same questions: Why did you build the business? Why do you want to stop the app? Do you want to sell the app? Knowing that I didn't build a business nor make any income from this application. Do candidates who take initiatives and like to craft their own apps on the side cause a red flag on the hiring manager's radar?

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  • Javascript: Machine Constants Applicable?

    - by DavidB2013
    I write numerical routines for students of science and engineering (although they are freely available for use by anybody else as well) and am wondering how to properly use machine constants in a JavaScript program, or if they are even applicable. For example, say I am writing a program in C++ that numerically computes the roots of the following equation: exp(-0.7x) + sin(3x) - 1.2x + 0.3546 = 0 A root-finding routine should be able to compute roots to within the machine epsilon. In C++, this value is specified by the language: DBL_EPSILON. C++ also specifies the smallest and largest values that can be held by a float or double variable. However, how does this convert to JavaScript? Since a Javascript program runs in a web browser, and I don't know what kind of computer will run the program, and JavaScript does not have corresponding predefined values for these quantities, how can I implement my own version of these constants so that my programs compute results to as much accuracy as allowed on the computer running the web browser? My first draft is to simply copy over the literal constants from C++: FLT_MIN: 1.17549435082229e-038 FLT_MAX: 3.40282346638529e+038 DBL_EPSILON: 2.2204460492503131e-16 I am also willing to write small code blocks that could compute these values for each machine on which the program is run. That way, a supercomputer might compute results to a higher accuracy than an old, low-level, PC. BUT, I don't know if such a routine would actually reach the computer, in which case, I would be wasting my time. Anybody here know how to compute and use (in Javascript) values that correspond to machine constants in a compiled language? Is it worth my time to write small programs in Javascript that compute DBL_EPSILON, FLT_MIN, FLT_MIN, etc. for use in numerical routines? Or am I better off simply assigning literal constants that come straight from C++ on a standard Windows PC?

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  • Is there or why not having a ruby technology specification similar to Java's JSR?

    - by romeu.hcf
    I think on a community portal where specifications are made, documented and specified to reference libraries and systems implementation. An example: A specification for Message Queue where redis clients, for instance, could implement it and where the libraries could be validated by the specification's test suite. Redic, redis-rb, hiredis, redis-connection-pool, redis-namespace should all implement this specification. This way, being easily replaced.

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  • Mimicking a bluetooth disconnection

    - by user2529672
    I've written a program to control a bluetooth device. I'm trying to test cases when the bluetooth disconnects, i.e. if its out of range. Physically taking the device out of range is one possibility, but its quite cumbersome and I have to go outside my office to achieve this. What can I do to trigger a disconnection? Is there, for example, an interferer I can setup, say with an Android phone, that would make the connection drop? Or limit the Bluetooth transmit power? Any other possibilities?

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  • Should all foreign table references use foreign key constraints

    - by TecBrat
    Closely related to: Foreign key restrictions -> yes or no? I asked a question on SO and it led me to ask this here. If I'm faced with a choice of having a circular reference or just not enforcing the restraint, which is the better choice? In my particular case I have customers and addresses. I want an address to have a reference to a customer and I want each customer to have a default billing address id and a default shipping address id. I might query for all addresses that have a certain customer ID or I might query for the address with the ID that matches the default shipping or billing address ids. I'm not sure yet how the constraints (or lack of) will effect the system as my application and it's data age.

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  • How is intermediate data organized in MapReduce?

    - by Pedro Cattori
    From what I understand, each mapper outputs an intermediate file. The intermediate data (data contained in each intermediate file) is then sorted by key. Then, a reducer is assigned a key by the master. The reducer reads from the intermediate file containing the key and then calls reduce using the data it has read. But in detail, how is the intermediate data organized? Can a data corresponding to a key be held in multiple intermediate files? What happens when there is too much data corresponding to one key to be held by a single file? In short, how do intermediate partitions differ from intermediate files and how are these differences dealt with in the implementation?

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  • What are the tradeoffs for using 'partial view models'?

    - by Kenny Evitt
    I've become aware of an itch due to some non-DRY code pertaining to view model classes in an (ASP.NET) MVC web application and I'm thinking of scratching my itch by organizing code in various 'partial view model' classes. By partial-view-model, I'm referring to a class like a view model class in an analogous way to how partial views are like views, i.e. a way to encapsulate common info and behavior. To strengthen the 'analogy', and to aid in visually organizing the code in my IDE, I was thinking of naming the partial-view-model classes with a _ prefix, e.g. _ParentItemViewModel. As a slightly more concrete example of why I'm thinking along these lines, imagine that I have a domain-model-entity class ParentItem and the user-friendly descriptive text that identifies these items to users is complex enough that I'd like to encapsulate that code in a method in a _ParentItemViewModel class, for which I can then include an object or a collection of objects of that class in all the view model classes for all the views that need to include a reference to a parent item, e.g. ChildItemViewModel can have a ParentItem property of the _ParentItemViewModel class type, so that in my ChildItemView view, I can use @Model.ParentItem.UserFriendlyDescription as desired, like breadcrumbs, links, etc. Edited 2014-02-06 09:56 -05 As a second example, imagine that I have entity classes SomeKindOfBatch, SomeKindOfBatchDetail, and SomeKindOfBatchDetailEvent, and a view model class and at least one view for each of those entities. Also, the example application covers a lot more than just some-kind-of-batches, so that it wouldn't really be useful or sensible to include info about a specific some-kind-of-batch in all of the project view model classes. But, like the above example, I have some code, say for generating a string for identifying a some-kind-of-batch in a user-friendly way, and I'd like to be able to use that in several views, say as breadcrumb text or text for a link. As a third example, I'll describe another pattern I'm currently using. I have a Contact entity class, but it's a fat class, with dozens of properties, and at least a dozen references to other fat classes. However, a lot of view model classes need properties for referencing a specific contact and most of those need other properties for collections of contacts, e.g. possible contacts to be referenced for some kind of relationship. Most of these view model classes only need a small fraction of all of the available contact info, basically just an ID and some kind of user-friendly description (i.e. a friendly name). It seems to be pretty useful to have a 'partial view model' class for contacts that all of these other view model classes can use. Maybe I'm just misunderstanding 'view model class' – I understand a view model class as always corresponding to a view. But maybe I'm assuming too much.

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  • How do programmer-seeking employers see Bioinformatics degree?

    - by Max
    I love programming, but I also love biology. Basically Bioinformatics sounds fun to me. However, there is a fat chance that I won't get a Bioinformatics job and will be forced to build my career around regular programming. Therefore a question: does it matter (much) for an employer if he is looking for a regular programmer but finds a Bioinformatics diploma? Or is it the same in the long run as a regular Informatics diploma?

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  • What are good reasons to use explicit interface implementation for the sole purpose of hiding members?

    - by Nathanus
    During one of my studies into the intricacies of C#, I came across an interesting passage concerning explicit interface implementation. While this syntax is quite helpful when you need to resolve name clashes, you can use explicit interface implementation simply to hide more "advanced" members from the object level. The difference between allowing the use of object.method() or requiring the casting of ((Interface)object).method() seems like mean-spirited obfuscation to my inexperienced eyes. The text noted that this will hide the method from Intellisense at the object level, but why would you want to do that if it was not necessary to avoid name conflicts?

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  • audio not playing through headphones

    - by JItendra
    I am using DELL alienware m14x. I have installed ubuntu 14.04 on my laptop. The problem that I am facing is that the audio plays only through speakers all the time even I though i plugin my headphone. When I go to sound settings it is showing me headphones in the "play sound through" which means that my system is able to detect the headphones but just the audio doesn't play through the headphones, instead it still plays through speaker. Can anyone one help me to figure it out please ! Thanks and Regards, Jitendra

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  • Strange resizing of partition after reinstalling Ubuntu 14.04 64bit

    - by Mike
    I started with Windows 7 on 120GB SSD and Ubuntu 14.04 32bit installed on 60GB partition on separate 1TB HDD. I just did a fresh reinstall of 14.04 64bit on the 1TB HDD. In the installation set up process, I selected the second choice of "deleting Ubuntu 14.04 and all it's files,documents, photos etc and reinstalling" to what I figured would reinstall the 64bit OS on the already existing 60GB allocated partition. Instead, it reinstalled Ubuntu as 43.5 GB and created a separate 15.8 partition. So now it reads that my disk space for Ubuntu ( in settingsdetails) is 43.5GB (instead of the previous 60GB that my old 32bit had) The upside is I can now access my 1TB HDD from my toolbar(and all the files located on it) Before, I could only access that through Windows (I can also access the SSD too, but that was always the case) Both drives are mounted now. My initial reaction was to go into Windows 7 disk management delete the strange/new 15gb partitionextend the 43.5 to the unallocated space. But I'm not sure if this is necessary or would even work. My question is why did it create a 15gb partition shrinking my ubuntu disk space, and is it useful? I don't want wasted space, so before I go through all my set up of Ubuntu, should I change this. At this time my HDD reads as 43.5 partiton, 15.8 partition, and 874GB exfat32 (939GB total)

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  • Flexible Keyboard starts too late

    - by user289237
    So I just managed to revive an old Windows XP machine that I am getting ready to format into Ubuntu 14.04. However the USB keyboard I have plugged in, powers down with the machine (obviously) but doesn't power up until the Windows loading screen (After my only chance to select boot device, for which I have a USB) It is really frustrating as this renders the f12 key useless and me stuck with a decade + 2 old machine. Thanks for any help :D

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  • Apache - create multiple aliases

    - by mc3mcintyre
    I'm trying to setup two websites on my Apache server. One is www.domain.com and the other is test.domain.com. Currently, my 000-default.conf file reads as follows: <VirtualHost www:80> # The ServerName directive sets the request scheme, hostname and port that # the server uses to identify itself. This is used when creating # redirection URLs. In the context of virtual hosts, the ServerName # specifies what hostname must appear in the request's Host: header to # match this virtual host. For the default virtual host (this file) this # value is not decisive as it is used as a last resort host regardless. # However, you must set it for any further virtual host explicitly. #ServerName www.domain.com #ServerAlias www ServerAdmin [email protected] DocumentRoot /var/www/domain.com/ # Available loglevels: trace8, ..., trace1, debug, info, notice, warn, # error, crit, alert, emerg. # It is also possible to configure the loglevel for particular # modules, e.g. #LogLevel info ssl:warn ErrorLog ${APACHE_LOG_DIR}/domain.error.log CustomLog ${APACHE_LOG_DIR}/domain.access.log combined UseCanonicalName on allow from all Options +Indexes # For most configuration files from conf-available/, which are # enabled or disabled at a global level, it is possible to # include a line for only one particular virtual host. For example the # following line enables the CGI configuration for this host only # after it has been globally disabled with "a2disconf". #Include conf-available/serve-cgi-bin.conf </VirtualHost> <VirtualHost test:80> DocumentRoot "/var/www/domain.com/test/" ServerName test.domain.com ServerAdmin [email protected] ErrorLog ${APACHE_LOG_DIR}/test.domain.error.log CustomLog ${APACHE_LOG_DIR}/test.domain.access.log combined UseCanonicalName on allow from all Options +Indexes </VirtualHost> # vim: syntax=apache ts=4 sw=4 sts=4 sr noet As is, when I use a browser to go to the www location, it show me a directory listing. However, if I remove the www:80 on Line 1 and replace it with *:80, it correctly displays the webpage. I don't understand why. Can anyone help me configure this 000-default.conf file so that www goes to "/var/www/domain.com" and that test goes to "/var/www/domain.com/test"? Thank you.

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  • Booting briefly shows CLI login and then black

    - by lepusfelix
    When I boot to Ubuntu on my dualboot system, it appears to boot normally, up to the point when I would normally expect to see the lightDM graphical login screen. However, I see a CLI login screen, which I assume is tty1. Before I get a chance to actually login to it, though, it drops to a black screen with a flashing cursor. Pressing ctrl+alt+f1 does nothing. When I hit the power button on the laptop, I see the usual scrolling text as Ubuntu shuts down. I know that this is related to me having installed the proprietary ATI drivers for the video card. Purging the drivers gave me back a GUI, but unfortunately no working desktop environment, and switching to the mesa drivers returned me to the black screen issue. The only way I can get a stable working CLI is through booting to advanced options and choosing a root shell prompt, as even the failsafe X session doesn't function for me.

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  • Using an external hard drive as a server and be able to connect via wifi [on hold]

    - by user289228
    OK, so i have an old external HDD(seagate 1tb) and a windows computer just in case but im trying to set it up as a server for my home at the moment but if everything goes right i want to transfer it to being a database hub for the business i work for that way i can have more then one register at a time on the same basic database. The thing is im new to the whole server part along with im not well versed with ubuntu either so what im getting at is if i can get it setup, can i connect it on ubuntu and run a linux based Point of sales program but have multiple linked to the single server? i may be able to do it via the router, i think its a belkin n600 with usb port but at this moment i dont know what it is since im not home. i just need information if this is possible and if so, a guide would be appreciated.

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  • usb hub not working on resume from suspend

    - by user1781498
    All the usb ports on my laptop work but when I resume from suspend some the usb ports don't work. lsusb Before Suspend: Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 04f3:014b Elan Microelectronics Corp. Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 003 Device 002: ID 04f2:b3a6 Chicony Electronics Co., Ltd Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub lsusb After Suspend: Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 04f3:014b Elan Microelectronics Corp. Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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  • I want to be able to load Ubuntu from the Windows Boot Loader using EasyBCD, but Ubuntu won't show up

    - by user1604288
    I am trying to create a dual-boot environment between Windows 8.1 and Ubuntu 14.04. I installed Ubuntu on a separate partition successfully, and I am following these instructions: Is it possible to boot Ubuntu using the Windows bootloader? However, when I restart my computer, Windows Bootloader still won't recognize Ubuntu. Does anyone know what could be wrong? EDIT: I can add an Ubuntu entry successfully using EasyBCD, but as soon as I restart my computer, the entry disappears.

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  • How to set automatic brightness in macbook pro?

    - by Mauricio Andrés
    I have just installes ubuntu 14.04 in my macbook pro, and I already configure all but the keyboard and screen brightness. In OS X, the brightness is controled automatically, I want to know if this is possible to do the same on ubuntu, if can't, then how can I set that do not start with all the brightness, this has been a great bug in ubuntu since the start, a lot of time has passed and this keeps been a real trouble. Thanks for your help.

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  • Keyboard and touchpad do not work

    - by user289219
    I have an Lenovo IdeaPad S210 Touch and I want to install Ubuntu on it. The problem is that when I try booting the system from a USB drive (starting the so-called Live session) to try to see if the system works on my computer, the system will turn on and everything will work properly except for the keyboard and the touchpad. Neither of them are listed when using this command: xinput --list. I cannot get my laptop keyboard/touchpad to work, but USB keyboards and mice will work and my laptop's touchscreen will also work.

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  • What could be causing frequent display freezes?

    - by austen
    I just installed Ubuntu 14.04 two days ago (coming from Win8) and in the two days that I've been using it, my display has frozen four or five times. The mouse won't move but the keyboard does respond so I can use the Ctrl+Alt+Bkspc command to fix it. It seems like it might just be the display freezing because one of the times I was watching a Youtube video and the audio continued playing. I have an Nvidia graphics card with the most recent Nvidia drivers for it enabled. I see that a lot of questions about Ubuntu freezing get marked as a duplicate and pretty much always linked back to a thread about what to do when it freezes. Clearly, I've got that bit figured out already and I did read that thread for further advice. What I'm looking for though is how to fix this permanently. output from lspci -nnk | grep -iA2 VGA: 00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) Subsystem: Lenovo Device [17aa:2200] Kernel driver in use: i915 Update: JohnnyEnglish pointed out that Ubuntu is using the integrated graphics, not my Nvidia card. It turns out my laptop uses Nvidia Optimus and I cannot enable only the graphics card through the BIOS. I found out about Nvidia Prime and got it set up using this article. The settings panel which allows you to select the graphics says that 'performance mode' is enabled but when I check which graphics controller is enabled through the terminal, it still says it's using the integrated graphics. I'm not sure if this could be causing the freezes but I guess it's a starting point. Any ideas on how to resolve this?

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  • chromium-browser --proxy-server debugging

    - by user3678068
    Many places online have pointed out to configure chromium proxy via command can be achieve with the following line chromium-browser --proxy-server=[username]:[password]@[host]:[port] but I got this result on every request. Here's the output in the command line right after executing the previous command. (They do not appear to be relevant. There are no new command line output when I try to visit a page) libGL error: failed to authenticate magic 30 libGL error: failed to load driver: vboxvideo ATTENTION: default value of option force_s3tc_enable overridden by environment. [29551:29551:0606/160459:ERROR:sandbox_linux.cc(268)] InitializeSandbox() called with multiple threads in process gpu-process I have double checked that the proxy credential works with the foxyproxy chrome plugin. What else can I try to figure this out? [Edit] Going to chrome://net-internals/#proxy and reading "Effective proxy settings" if I do chromium-browser with no flags, I get Use DIRECT connections. Source: GSETTINGS if chromium-browser --proxy-server=[host]:[port], I get a message box requesting to login, and under "Effective proxy settings": Proxy server: [host]:[port] if chromium-browser --proxy-server=[user]:[pass]@[host]:[port], "Effective proxy settings" shows: Use DIRECT connections

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  • Windows XP with Ubuntu 14.04 on 2 separate hard drives

    - by maplenet2
    I am new to Ubuntu. I have Windows XP Professional 32-bit on one 300GB IDE hard drive and Ubuntu 14.04 running on another 61GB IDE hard drive, and I cannot get my Windows XP to boot with Grub! When I select Windows XP from the boot menu, Grub just restarts my computer. The computer I have with those two hard drives is a Dell Optiplex GX240, so the hardware is old, and its BIOS won't let me change the boot priority on the two IDE hard drives. What can I do now? Is there a step I missed when installing Ubuntu? Can I edit Grub to boot Windows XP without messing with the BIOS? Do I have to downgrade to an older release of Ubuntu to make it work? I am willing to reinstall Ubuntu, if that's what it takes.

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  • How to set multiple nameservers in /etc/resolv.conf which sticks on reboot?

    - by chrone
    Ubuntu 14.04 Server edition only displays "nameserver 127.0.0.1" in "/etc/resolv.conf" on each reboot if the dns-nameservers in "/etc/network/interfaces" contains 127.0.0.1 and some other DNS such as Google Public DNS. On /etc/network/interfaces I set as follows: dns-nameservers 127.0.0.1 8.8.8.8 But after a reboot, /etc/resolv.conf gives me this: nameserver 127.0.0.1 Shouldn't the "nameserver 8.8.8.8" listed in the /etc/resolv.conf too? Thanks in advanced.

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