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• Why doesn't VisualSVN enforce credentials correctly?

  - by mrt181

  I have a svn repository that is managed by VisualSVN. I have created a new group and added two new users to that group. When i attach this group to an existing repository and set the rights to Read/Write, these rights do not work on subdirectories. i have to set the rights on every subdirectory. but even then, the users of this group can only read the repository, they can't write anything to it. It works for the new users when i create a new repository. The users use tortoisesvn and get a message like this when they try to write to this repository for example https://myserver:8443/svn/subdir/Application/trunk access to /svn/subdir/!svn/act/76a4c6fd-fa15-594a-a419-18493dacaf51' forbidden

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• Toggle "ask for password after screensaver/sleep" or the delay in 10.7 using terminal

  - by desbo

  There's an option in the preference panel to change the time the mac is able to be in sleep/screensaver before requiring a password to be unlocked again. I'm using OS X Lion 10.7. Is there any way to change this setting using the terminal or an applescript? I tried to change the plist file using: defaults write com.apple.screensaver askForPasswordDelay -int 60 also tried defaults write com.apple.screensaver askForPasswordDelay -float 60 also completely disabling the password didnt work either defaults write com.apple.screensaver askForPassword -int 0 The plist file was changed, but it had no effects at all. It's the same plist file that gets changed when manually switching the setting in the preferences. Would be awesome if anyone got an idea how to fix my problem. EDIT: also tried to: 1) add -currentHost flag 2) drop the -int / -float

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• At what point is asynchronous reading of disk I/O more efficient than synchronous?

  - by blesh

  Assuming there is some bit of code that reads files for multiple consumers, and the files are of any arbitrary size: At what size does it become more efficient to read the file asynchronously? Or to put it another way, how small must a file be for it to be faster just to read it synchronously? I've noticed (and perhaps I'm incorrect) that when reading very small files, it takes longer to read them asynchronously than synchronously (in particular with .NET). I'm assuming this has to do with set up time for things like I/O Completion Ports, threads, etc. Is there any rule of thumb to help out here? Or is it dependent on the system and the environment?

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• Ubuntu 13.10 not playing DVD videos

  - by John Hill

  I installed Ubuntu Gnome 13.10 on my computer yesterday, and everything seems to be working fine so far, except that it isn't reading video or audio CD's and DVD's. At first, I inserted a DVD video, and it played normally for maybe 30-45 seconds before coming up with a "internal read error" or something like that. I was using the Totem player when the problem occurred, so I tried installing the VLC media player. It wouldn't read the disc at all, so I uninstalled the player. Now, the Totem player won't even begin playing the DVD. The player sometimes doesn't even open up when I insert the DVD, and other times it will but says it can't read it. I've tried several different DVD's and CD's with similar results. The computer is recognizing the optical drive, because when I open "Files", it shows the drive and the disc, but can't play it. Previously, I ran Ubuntu 13.04 with the Gnome desktop installed from the software center, and I had no issues. Any help is appreciated!

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• How ad retargeting works?

  - by Bojan Babic

  Recently, I read that Facebook ads are moving towards retargeting and got interested deeper into subject. Essentially, retargeting is technique advertisers use that tracks purchase intent by putting cookies into your browser and when you visit another website within ad network you will see ad for item you "wanted to buy". In order this to for, both publisher and advertiser need to work together. Publisher needs add couple of lines of javascript and publisher need to be able to read this info across sites. In most cases, javascript inserts iframe from adnetwork domain. Iframe script sets cookies for both host domain and remote adnetwork domain. However, Same Origin policy do not let iframes read/set content from parent domain. Is there something I'm missing here? Can someone explain how this technique actually works?

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• Pros and Cons of Facebook's React vs. Web Components (Polymer)

  - by CletusW

  What are the main benefits of Facebook's React over the upcoming Web Components spec and vice versa (or perhaps a more apples-to-apples comparison would be to Google's Polymer library)? According to this JSConf EU talk and the React homepage, the main benefits of React are: Decoupling and increased cohesion using a component model Abstraction, Composition and Expressivity Virtual DOM & Synthetic events (which basically means they completely re-implemented the DOM and its event system) Enables modern HTML5 event stuff on IE 8 Server-side rendering Testability Bindings to SVG, VML, and <canvas> Almost everything mentioned is being integrated into browsers natively through Web Components except this virtual DOM concept (obviously). I can see how the virtual DOM and synthetic events can be beneficial today to support old browsers, but isn't throwing away a huge chunk of native browser code kind of like shooting yourself in the foot in the long term? As far as modern browsers are concerned, isn't that a lot of unnecessary overhead/reinventing of the wheel? Here are some things I think React is missing that Web Components will care of. Correct me if I'm wrong. Native browser support (read "guaranteed to be faster") Write script in a scripting language, write styles in a styling language, write markup in a markup language. Style encapsulation using Shadow DOM React instead has this, which requires writing CSS in JavaScript. Not pretty. Two-way binding

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• Single NFS folder shared across multiple clients

  - by parthi_for_tech

  I'm trying to mount a single NFS folder from server say "/share/folder" to multiple clients up to 32 clients, and the clients tries to access the folder and create files. The problem I'm facing is that when I execute the write command I see only one client is able to access the folder the remaining clients are blocked and not able to proceed to write. So, is whatever I'm trying to do above is correct? Can we write/read files from the same folder on multiple clients? if yes how can I do it prallel? Kindly advice! Thanks

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• Mechanics of reasoning during programming interviews

  - by user129506

  This is not the usual "I don't want to write code during an interview", in this question the assumption is that I need to write code during an interview (think about the level of rewriting the quicksort or mergesort from scratch) I know how the algorithm work or I have a basic idea of how I should start working from there, i.e. I don't remember the algorithm by heart I noticed that even on a whiteboard, I always end up writing bugged code or code that doesn't compile. If there's a typo, whatever I usually live with that.. but when there's a crash due to some uncaught particular case I end up losing confidence in my skills. I realize that perhaps interviewers might want to look at how I write code and/or how I solve problems rather than proof-compiling my whiteboard code, but I'd like to ask how should I approach the above problem in mental terms, i.e. what mental steps should I follow when writing code for an interview with the two bullet points above. There must be a unique and agreed series of steps I should follow to avoid getting stuck/caught into particular exception cases (limit cases) that might end up wasting my time and my energies rather than focusing on the overall algorithm for the general case. I hope I made my point clear

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• How to set umask for a folder and it's subfolder?

  - by Cyril N.

  I'm working on the same directory with some friends and they access it via SSH. I added us in the same group and defined a sticky bit to keep the user:group values the same. But when a user create a file/folder, the Write attribute is not defined for the group, disabling other to write it/on it. How can I define the Umask to add the Write value for groups in the specific directory and it's subfolders ? I tried to find some help before, but I only saw helps for Fedora/CentOs, and I'm using Debian Squeeze. Thanks for your help

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• Why is math taught "backwards"? [closed]

  - by Yorirou

  A friend of mine showed me a pretty practical Java example. It was a riddle. I got excited and quickly solved the problem. After it, he showed me the mathematical explanation of my solution (he proved why is it good), and it was completely clear for me. This seems like natural approach for me: solve problems, and generalize. This is very familiar to me, I do it all the time when I am programming: I write a function. When I have to write a similar function, I generalize the problem, grab the generic parts, and refactor them to a function, and solve the original problems as a specialization of the general function. At the university (or at least where I study), things work backwards. The professors shows just the highest possible level of the solutions ("cryptic" mathematical formulas). My problem is that this is too abstract for me. There is no connection of my previous knowledge (== reality in my sense), so even if I can understand it, I can't really learn it properly. Others are learning these formulas word-by-word, and get good grades, since they can write exactly the same to the test, but this is not an option for me. I am a curious person, I can learn interesting things, but I can't learn just text. My brain is for storing toughts, not strings. There are proofs for the theories, but they are also really hard to understand because of this, and in most of the cases they are omitted. What is the reason for this? I don't understand why is it a good idea to show the really high level of abstraction and then leave the practical connections (or some important ideas / practical motivations) out?

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• How can I really master a programming language?

  - by cprogcr

  I know that learning a language, you can simply buy a book, follow the examples, and whenever possible try the exercises. But what I'm really looking is how to master the language once you've learned it. Now I know that experience is one major factor, but what about learning the internals of the language, what is the underlying structure, etc. There are articles out there saying read this book, read that book, make this game and that game. But to me this doesn't mean to master a language. I want to be able to read other people's code and understand it, no matter how hard that is. To understand when to use a function and when another, etc etc. The list could go on and on but I believe I've made the point. :) And finally, take whatever language as an example if needed, though best would be if C was taken as an example.

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• USB flash module giving errors

  - by vshenoy

  Hi, I have a SATA USB flash module which was earlier running a 2.4 linux kernel (2.4.36.6) and on which now I am trying to install ubuntu server 10.04.1 LTS. I have two such USB flash modules and on one of them the installation process itself giving these errors: sd 4:0:0:0 [sda] Device not ready sd 4:0:0:0 [sda] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE sd 4:0:0:0 [sda] Sense Key : Not Ready [current] sd 4:0:0:0 [sda] Add. Sense: Medium not present sd 4:0:0:0 [sda] CDB: Write(10): 2a 00 00 05 48 02 00 00 04 00 end_request: I/O error, dev sda, sector 46114 usb 1-1: reset high speed USB device using ehci_hcd and address 2 Buffer I/O error on device sda1, logical block 172033 lost page write due to I/O error on sda1 Buffer I/O error on device sda1, logical block 172034 lost page write due to I/O error on sda1 on the other the installation is successful, but after a day or two of running the machine hangs because of kernel spewing these messages: Remounting filesystem read-only EXT2-fs error (device sda1): read_block_bitmap: Cannot read block [bitmap - block_group = 105, block_bitmap = 860161] EXT2-fs error (device sda1): ext2_get_inode: unable to read inode block - inode=13083, block=24683 ext2_free_inode: bit already cleared for inode 83966 and the machine needs to be hard rebooted. On both the systems SCSI emulation with usb_storage driver is being used to detect the module. Here is the output of /proc/scsi/scsi on 2.4: # cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: TS Model: UFM Rev: 1100 Type: Direct-Access ANSI SCSI revision: 02 and on 2.6: # cat /proc/scsi/scsi Attached devices: Host: scsi6 Channel: 00 Id: 00 Lun: 00 Vendor: TS Model: UFM Rev: 1100 Type: Direct-Access ANSI SCSI revision: 00 i.e. only 'ANSI SCSI revision:' is shown as different, although I am not sure if this can cause any problem. Really appreciate if someone can point as to how to debug this issue or any mailing list where I can further ask questions about this.

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• New customer references for Exadata-based projects

  - by Javier Puerta

  Milletech Systems, Inc. shows a large state university how to improve query response times 15-fold using its grant management solution built on Oracle’s Extreme Performance Infrastructure. Read More. Ação Informática helped Valdecard realize a 15-Fold Improvement in Fleet-Management and Benefit Card Data Processing using Oracle Exadata Machine. Read More. Neusoft deployed Benxi Municipal Human Resources and Social Security Bureau’s cloud-based database platform to process social insurance payments 50-times faster using Oracle Exadata Database Machine. Read More.

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• Mounting ddrescue image after recovery (in over my head)

  - by BorgDomination

  I'm having problems mounting the recovery image. I've tried to mount the image multiple ways. quark@DS9 ~ $ sudo mount -t ext4 /media/jump1/1recover/sdb1.img /mnt mount: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so quark@DS9 ~ $ sudo mount -r -o loop /media/jump1/1recover/sdb1.img recover mount: you must specify the filesystem type quark@DS9 ~ $ sudo mount /media/jump1/1recover/sdb1.img mnt mount: you must specify the filesystem type It doesn't even give me detailed information on the file I just made, nautilus says it's 160gb. quark@DS9 ~ $ file /media/jump1/1recover/sdb1.img /media/jump1/1recover/sdb1.img: data quark@DS9 ~ $ mmls /media/jump1/1recover/sdb1.img Cannot determine partition type I'm not sure what I'm doing wrong or if I started this process incorrectly from the beginning. I've outlined what I've done so far below. I'm clueless, I'd appreciate if someone had some input for me. What I have done from the beginning My laptop has two hard drives. One has the dual boot Win7 / Linux Mint system files. Secondary one contained my /home folder. The laptop was jarred and the /home disk was broken. I tried a LiveCD recovery, it failed. Wouldn't even load a Live session with the disk installed. So I turned to ddrescue. quark@DS9 ~ $ sudo fdisk -l Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders, total 312581808 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0009fc18 Device Boot Start End Blocks Id System /dev/sda1 * 2048 112642047 56320000 7 HPFS/NTFS/exFAT /dev/sda2 138033152 312580095 87273472 83 Linux /dev/sda3 112644094 138033151 12694529 5 Extended /dev/sda5 112644096 132173823 9764864 83 Linux /dev/sda6 132175872 138033151 2928640 82 Linux swap / Solaris Partition table entries are not in disk order Disk /dev/sdb: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders, total 312581808 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0002a8ea Device Boot Start End Blocks Id System /dev/sdb1 * 63 312576704 156288321 83 Linux Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xed6d054b Device Boot Start End Blocks Id System /dev/sdc1 63 1953520064 976760001 7 HPFS/NTFS/exFAT sda - 160g internal, holds all system files and all computer functions. sdb - 160g internal, BROKEN, contains about 140g of data I'd like to recover. sdc - 1T external, contains recovery image. Only place that has space to do all this. From this site, https://apps.education.ucsb.edu/wiki/Ddrescue I used this script to create an image of the broken hard drive. I changed the destination to the external USB drive. #!/bin/sh prt=sdb1 src=/dev/$prt dst=/media/jump1/1recover/$prt.img log=$dst.log sudo time ddrescue --no-split $src $dst $log sudo time ddrescue --direct --max-retries=3 $src $dst $log sudo time ddrescue --direct --retrim --max-retries=3 $src $dst $log Everything looked like it came off without a hitch: quark@DS9 ~ $ sudo bash recover1 Press Ctrl-C to interrupt Initial status (read from logfile) rescued: 0 B, errsize: 0 B, errors: 0 Current status rescued: 160039 MB, errsize: 4096 B, current rate: 35588 B/s ipos: 3584 B, errors: 1, average rate: 22859 kB/s opos: 3584 B, time from last successful read: 0 s Finished 12.78user 1060.42system 1:56:41elapsed 15%CPU (0avgtext+0avgdata 4944maxresident)k 312580958inputs+0outputs (1major+601minor)pagefaults 0swaps Press Ctrl-C to interrupt Initial status (read from logfile) rescued: 160039 MB, errsize: 4096 B, errors: 1 Current status rescued: 160039 MB, errsize: 1024 B, current rate: 0 B/s ipos: 1536 B, errors: 1, average rate: 13 B/s opos: 1536 B, time from last successful read: 1.3 m Finished 0.00user 0.00system 3:43.95elapsed 0%CPU (0avgtext+0avgdata 4944maxresident)k 238inputs+0outputs (3major+374minor)pagefaults 0swaps Press Ctrl-C to interrupt Initial status (read from logfile) rescued: 160039 MB, errsize: 1024 B, errors: 1 Current status rescued: 160039 MB, errsize: 1024 B, current rate: 0 B/s ipos: 1536 B, errors: 1, average rate: 0 B/s opos: 1536 B, time from last successful read: 3.7 m Finished 0.00user 0.00system 3:43.56elapsed 0%CPU (0avgtext+0avgdata 4944maxresident)k 8inputs+0outputs (0major+376minor)pagefaults 0swaps It looks like, from where I'm standing it worked perfectly. Here's the log: # Rescue Logfile. Created by GNU ddrescue version 1.14 # Command line: ddrescue --direct --retrim --max-retries=3 /dev/sdb1 /media/jump1/1recover/sdb1.img /media/jump1/1recover/sdb1.img.log # current_pos current_status 0x00000600 + # pos size status 0x00000000 0x00000400 + 0x00000400 0x00000400 - 0x00000800 0x254314FC00 + I'm not sure how to proceed. Does this mean all of my data is lost???????? Appreciate ANY input!

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• Software Manager who makes developers do Project Management

  - by hdman

  I'm a software developer working in an embedded systems company. We have a Project Manager, who takes care of the overall project schedule (including electrical, quality, software and manufacturing) hence his software schedule is very brief. We also have a Software Manager, who's my boss. He makes me write and maintain the software schedule, design documents (high and low level design), SRS, change management, verification plans and reports, release management, reviews, and ofcourse the software. We only have one Test Engineer for the whole software team (10 members), and at any given time, there are a couple of projects going on. I'm spending 80% of my time making these documents. My boss comes from a Process background, and believes what we need is better documentation to improve software: (1) He considers the design to be paramount, coding is "just writing the design down", it shouldn't take too long, and "all the code should be written before the hardware is ready". (2) Doesn't understand the difference between a Central & Distributed Version control, even after we told him its easier to collaborate with a distributed model. (3) Doesn't understand code, and wants to understand every bug and its proposed solution. (4) Believes verification should be done by developer, and validation by the Tester. Thing is though, our verification only checks if implementation is correct (we don't write unit tests, its never considered in the schedule), and validation is black box testing, so the units tests are missing. I'm really confused. (1) Am I responsible for maintaining all these documents? It makes me feel like I'm doing the Software Project Management, in essence. (2) I don't really like creating documents, I want to solve problems and write code. In my experience, creating design documents only helps to an extent, its never the solution to better or faster code. (3) I feel the boss doesn't really care about making better products, but only about being a good manager in the eyes of the management. What can I do?

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• When can I publish a software tool written at work?

  - by AlexMA

  I'm working on a software problem at work that is fairly generic, but I can't find a library I like to solve it, so I'm considering writing one myself (at least a bare-bones version). I'll be writing some if not all of the 1.0 version at work, since I need it for the project. If turns out well I might want to bring the work home and polish it up just for fun, and maybe release it as an open-source project. However, I'm concerned that if I wrote the 1.0 version at work I may not be allowed to do this from a legal sense. Obviously I could ask my boss (who probably won't care), but I'm curious how other programmers have dealt with this issue and where the law stands here. My one sentence question is, When is it okay (legally/ethically) to open-source a software tool originally written by you for work at work? What if you have expanded the original source significantly during off-hours? Follow-up: Suppose I write the whole thing at home on my time then simply use it at work, does that change things drastically? Follow-up 2: Note that I'm not trying to rip off my employer (I understand that they're paying me to build products that they own)--I'm just wondering if there's a fair way of doing this for all involved... It would be nice if some nonprofit down the road could use my code and save them some time. Also, there's another issue at stake. If I write the library for a very simple, generic thing (like HTML tables in Javascript), does that mean I can never again do so on my own time without putting myself at legal risk (even if it was a whole new fresh rewrite or a segment of a larger project). Am I surrendering my right to write code for this sort of project for the rest of my life (without this company's permission), since the code at work might still be somewhere in my brain influencing me? This seems related to software patents, as a side-note.

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• Places to share my new blog entry? [closed]

  - by TomasAlabes

  I started yesterday a tech blog called devhike and as my first entry I explained a palette behaviour made with RaphaelJS. I wanted to share the entry the tech people around the world, to see if they like it, find it useful, etc. I submitted the link to my post in dzone.com and hackernews which are the places from where I like to read tech articles, but I feel there should be other places where I could post my blog or entry too. If not, I feel my blog will never be read. Do you know any places or ways to be read?

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• Should I make a seperate unit test for a method, if it only modifies the parent state?

  - by Dante

  Should classes, that modify the state of the parent class, but not itself, be unit tested separately? And by separately, I mean putting the test in the corresponding unit test class, that tests that specific class. I'm developing a library based on chained methods, that return a new instance of a new type in most cases, where a chained method is called. The returned instances only modify the root parent state, but not itself. Overly simplified example, to get the point across: public class BoxedRabbits { private readonly Box _box; public BoxedRabbits(Box box) { _box = box; } public void SetCount(int count) { _box.Items += count; } } public class Box { public int Items { get; set; } public BoxedRabbits AddRabbits() { return new BoxedRabbits(this); } } var box = new Box(); box.AddRabbits().SetCount(14); Say, if I write a unit test under the Box class unit tests: box.AddRabbits().SetCount(14) I could effectively say, that I've already tested the BoxedRabbits class as well. Is this the wrong way of approaching this, even though it's far simpler to first write a test for the above call, then to first write a unit test for the BoxedRabbits separately?

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• Why does Android make good coding so difficult?

  - by metacircle

  my daily work is writing tools in C#/WPF. After over more than 1 year on the job now, I came to love MVVM, IoC Containers, XAML (and more). It's pure fun to write code, since simple, maintainable and extendable code just comes naturally when you follow a few basic patterns. In my free time I really want to write some apps, mainly for my own personal use. I want to write apps for fun and not to make money or anything, that being said, paying an annual fee to be allowed to use my own apps on my own device is a total no-go for me. So I am not able to code for Windows Phone and am also not able to use Xamarin on Android (which is sad since Visual Studio + Resharper is programmers heaven). So I am stuck with Android "classic" Java development. Everytime I sit down at home to create an app, or improve some of the code I have already written I get annoyed very quick because getting good, decoupled code is just so hard to accomplish. It feels like everything you have to do in Android to create a good architecture is a workaround instead of being the way things are meant to be. Writing the UI in xml is fine, but everything else is one big code mess. Even all the tutorials do all their coding in the code behind. For 'hello world' this is fine, but for anything bigger this gets messy very very quick. This is where the fun for me ends. It's just no fun anymore because I just spend 90% of my time refactoring and thinking of workarounds how to make my code more maintainable with all the restrictions Android puts on me. Am I missing a crucial part or is this just the way Android is meant to be? Do you have any suggestions how to learn 'the fun way' of Android programming.

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• On-Premises to Office 365: Identity

  - by Sahil Malik

  SharePoint, WCF and Azure Trainings: more information “Run your business, not your mail server.” I am not sure where I read that, but it makes so much sense! Every organization is moving to the cloud, and some just haven’t started their journey yet. One of the fastest and most compelling online cloud based offerings is Office 365. Available in various SKUs, you can get SharePoint, Lync, Exchange, and Office professional as cloud-based offerings. The subscriptions are as low as $2 per user per month to $20 something per user per month. Also, with SharePoint 2013, if you buy Office 365 subscriptions for your users, you don’t need to buy CALs (Client Access Licenses) for on-premises use. Read full article here. Read full article ....

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• Finding the displacment of a robot [closed]

  - by Jordan Brown

  I'm building a quadruped (4 legs 3 DOF) for my major work in electronics at high school. I need to know the displacement of the robot and I can't use an encoding wheel. I've done my research and I found a system where I use an accelerometer, gyroscope and a magnetometer to determine the displacement but I'm not sure how to code it. I'm using Arduino and will use compatible sensors. I would like to be able to implement something similar to this video which demonstrates the principles evaluated in this paper. I don't need to map the data on a screen, just be able to read its displacement from its last recorded position. EG. (Read Position) --- (Do "stuff") --- (Read Position) --- (Calculate displacement caused by "stuff")

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• Database Insider - June 2014 issue now available

  - by Javier Puerta

  The June issue of the Database Insider newsletter is now available. (Full newsletter here) NEWS June 10: Oracle CEO Larry Ellison Live on the Future of Database Performance At a live webcast on June 10 at Oracle’s headquarters, Oracle CEO Larry Ellison is expected to announce the upcoming availability of Oracle Database In-Memory, which dramatically accelerates business decision-making by processing analytical queries in memory without requiring any changes to existing applications.Read More New Study Confirms Capital Expenditure Savings with Oracle Multitenant A new study finds that Oracle Multitenant, an option of Oracle Database 12c, drives significant savings in capital expenditures by enabling the consolidation of a large number of databases on the same number or fewer hardware resources.  Read More Read full newsletter here

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• Xubuntu: how do I automatically mount external NTFS drive with writes allowed?

  - by user74372

  i would have thought mine was such a common question that there would be a simple solution already built in to xubuntu - but there isnt. i have 2 separate external hard disks and connect them to a usb port at different times - i would like them to be automatically mounted as read/write, but apparently the designers of gnome-volume-manager decided that shouldnt be possible and they are mounted as read-only in fact, i can write new files to them, but cannot then delete the new files i just wrote! is there a workaround? i read somewhere that etc/fstab doesn't apply to removable media, which are mounted by gnome-volume-manager and therefore cannot be unmounted by a user

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• What relational database system should I learn? [closed]

  - by acidzombie24

  At the moment i know sqlite (my favorite), mysql (its ok, i get annoyed) and i do not want to learn ms/t sql (it only allows one nullable row if the column is unique). I am thinking about learning a new database system. My requirements for it is Must allow multiple connections at once (read and write) All or data i choose must be ACID compliant Performance should be good. I have a 17gb table in one project. It should perform well on read and transactional writes. With mysql it took hours to restore it and there were no foreign keys on that specific table. It only finished in a workday because i found a suggestion to adjust a setting which i think was key-buffer. And it still took hours Unique columns that allow more then one row to be null. I shouldn't have to say it but dammit MS. Allows one to make ongoing backups. Something like 'binary logs'. Some relatively small amounts of data i can grab and apply it to my local db to have it in sync with the one on the server. Table joins. I rather not write a bunch of queries to simulate a join What I would like but is not required Foreign keys. This may be a requirement later Open sourced Fair tool support. So i can measure queries, easily backup/restore, etc .NET and C (or C++) interface. (I seen one that uses raw tcp with JSON which was okish) Good subquery support. Once i was working with an older version of mysql (i believe <5.1 but it could have been 5.1) and i had to write many queries to do one query because it couldn't do subqueries. Or maybe it couldnt do it efficiently and died bc of memory limitations with a huge dataset. What db system should i learn?

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• ec2 instance won't boot!

  - by TheToolBox

  So I had a server lose connection while updating to 14.04LTS. Foolishly, it ended up getting rebooted, and now I'm here. I disconnected the volume and mounted it on another system, chrooted it, and updated the kernel. Still no dice. Any idea what the problem could be? Thanks in advance! The instance log is below: ******************* BLKFRONT for device/vbd/2049 ********** backend at /local/domain/0/backend/vbd/3005/2049 Failed to read /local/domain/0/backend/vbd/3005/2049/feature-barrier. Failed to read /local/domain/0/backend/vbd/3005/2049/feature-flush-cache. 16777216 sectors of 512 bytes ************************** [H[J Booting 'Ubuntu 14.04 LTS, memtest86+' root (hd0) Filesystem type is ext2fs, using whole disk kernel /boot/memtest86+.bin ============= Init TPM Front ================ Tpmfront:Error Unable to read device/vtpm/0/backend-id during tpmfront initialization! error = ENOENT Tpmfront:Info Shutting down tpmfront xc: error: panic: xc_dom_core.c:621: xc_dom_find_loader: no loader found: Invalid kernel xc_dom_parse_image returned -1 close(3) Error 9: Unknown boot failure Press any key to continue...

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