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• Guaranteeing ACID properties for InnoDB databases.

  - by plinehan

  What steps must one take to ensure that an otherwise defaultly-configured InnoDB server is truly ACID compliant? The InnoDB configuration page mentions that the hardware itself must be configured to honor fsync calls, i.e. disable any write-back caches. This page mentions some other concerns, but may be conflating the binary log and the InnoDB log, and may be a bit out of date regarding default settings for MySQL 5.x. Upon reading the binary log document page it would seem that the "sync_binlog=1" setting is not required for ACID properties in general, only for ACID properties vis a vis point-in-time recovery and replication. So, is disabling write-back disk caching sufficient, or are there other settings that must be tweaked?

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• Streaming Flash Video - getting my feet wet

  - by Travis

  I'm working on a project that will involve having a couple thousand short videos online. I haven't done anything with online video before and this is all a bit new to me, so I am looking for some general advice... I would like to use Flowplayer, and I would like to encode the videos as H264s. I am enamoured with Flowplayer's slow motion feature, which if I understand correctly, is only available using a Wowza server. I'm wondering: Is it advisable to use a delivery network of some sort? (Flowplayer seems to have a partnership with HDDN, and recommends them. http://www.hddn.com/) Or would I be better off purchasing Wowza and installing it on our own server? (At first glance, it looks as though signing up with a network like HDDN is much simpler, but perhaps there are problems that come along with this...?) Any tips / warnings of imminent peril would be much appreciated. Thanks in advance.

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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) would you recommend that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly. edit To be clear, the question isn't just about "abnormal" latency, but about latency in general. Additionally, it is specifically about TCP/IP-over-Ethernet and not about other protocols (even if they have better latency characteristics.)

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• How do I convert this filetype to pdf?

  - by Gnoupi

  This question is coming back often, and the general answers are very often the same. In an objective to concentrate useful information in one place, here is a community wiki about it. How can I convert this filetype to pdf? This question will have two kind of answers: The generic case, which works for most filetypes. The specific cases, which should be one answer per filetype. Restricting the OS field to Windows, as most of these questions are about this OS. This may change eventually. As it is community wiki, feel free to edit this question to improve it as well.

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• How to make BASH try and autocomplete on Enter

  - by swatso33

  I've noticed that for many of the commands I use in bash I have actually learned how many letters of the command I must type before I can press [TAB] to have bash successfully autocomplete the command. For example when opening chromium I dont usually type the whole command but instead type $ chrom[TAB][ENTER] and bash successfully autocompletes the command to chromium before I hit the [ENTER] key. Is there a way to make autocomplete work without having to hit [TAB]? My general thinking is that if I type $ chrom[ENTER] bash could check and see that chrom isnt a valid command, but it would make sense to autocomplete it to chromium since that is the only command that starts with chrom

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• File apparently doesn't exist when attempting to delete it

  - by Alex Yan

  A month or so back, I untarred the Linux source in a folder in Cygwin (I was curious as to whether or not it would compile with MinGW 'cause my other computer running Linux is a slow single core Sempron). I tried deleting it, but there's 1 file left, and it will not delete... Cygwin resides in C:\cygwin, and I untarred the source in C:\cygwin\src\linux-3.7.1. It didn't compile... So I tried deleting the folder. It was going well, until at the end, when I realized not all files are deleted. I tried deleting linux-3.7.1 folder again, and an error popped up: I opened the folder, and found that there's 1 source file left: aux.c, which is in C:\cygwin\src\linux-3.7.1\drivers\gpu\drm\nouveau\core\subdev\i2c\aux.c. It will not: Delete Open Move General properties: Security properties: How do I remove this file?

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• A keyboard shortcut from a sequence of keystrokes for Linux

  - by Little Bobby Tables

  I am looking for a way to define an Emacs-style keys sequence as a keyboard shortcut in Linux - Specifically, in Gnome, but more general solutions are also acceptable. For example, I would like a sequence like "Alt-w t" (that is, first press Alt-w and then t) to open a terminal, "Alt-w c" to close a window, and so on. The rationale behind this question is twofold: Make more use of desktop-wide keyboard shortcuts Make an old keyboard, that has no Win key, usable with desktop-wide keyboard shortcuts, without causing too many collisions with application - Specifically with Emacs. Thanks!

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• Am I crazy? Demos on jQuery's 'effects' page not working in any browser

  - by Mega Matt

  Hi all, I want to make sure I'm not crazy, because I can't get any of the effects demos to work on jQuery's demo pages. I thought it might be my new Firebug version (1.5.2) or Firefox in general, but they're not working in IE or Chrome either. Here are the links where the demos aren't working. One is for highlight, and the other is for explode. Incidentally, highlight is the one that I'm trying to use. Could it be the new jQuery UI version? Is anyone else having these not work? Effect 1 Effect 2

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• Color Temperature in PowerPoint 2010

  - by Otaku

  I'm teaching PowerPoint 2010 and it's got some great new features. Unfortunately, one that I can't wrap my head around is the the new "Color Temperature" feature for pictures. I do understand color temperature in general (i.e. the lower the number, the "colder"/"oranger" - the higher the number, the "hotter"/"bluer"). The way PowerPoint implements it seems opposite from most other programs - like Photo Filter in Photoshop. So I need to understand what this feature is in more detail so I can explain it to my students. Does anyone know?

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• Cannot seem to disable ability to view temporary internet files via group policy

  - by user162707

  Windows XP Pro SP3, IE8 (8.0.6001.18702), within local gpedit.msc I did the below: User Config/Admin Temp/Windows Comp/IE enabled: disable changing temporary internet file settings User Config/Admin Temp/Windows Comp/IE/Delete Browsing History enabled all (11 items) However there is a loophole that lets me still wipe history & other files via: Tools, Internet Options, Browsing History, Settings, View Objects, delete everything, hit up arrow, go to History (hidden folders has to be on), delete everything Only way around this I can see is to disable General Internet Options Page via group policy, setup NTFS folder restrictions on that temp internet files (worried about adverse affects like not being able to store them), or further grind-down group policy somewhere else to prevent deleting files. Just odd group policy wouldn't have a settings to simply disable the Browser History Settings button (as it further shows the location which a user could just go to). So just curious if someone can confirm maybe this is simply not available in group policy & their suggested action

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• Good Documentation on Avaya IP Office 500 r2 setup

  - by Cliff Racer

  I have set up a couple of Avaya IP Office systems over the course of my current job. I have a pretty good handle on the process, but now I am faced with something I have not done before. Both the IP office systems I have set up used all Digital phones. The new system we are putting in place will actually use IP phones for the first time. After tyring to track down some general documentation on my own, I was not able to find anything that left me feeling comfortable about setting up IP phones on an Avaya IP Office 500. Does anyone know of any good how-To's for setting up IP phones on IP Office? I get the impression its pretty simple but learend enough about Avaya to know that there are some tricky aspects to setting them up

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• What contributes to smooth online video streaming?

  - by Wesley

  I had a general question about streaming videos online; in particular, on YouTube. What really is required to smoothly stream videos at 360p or 480p? Then for that HD goodness, what really allows a computer to smoothly stream 720p and 1080p? I'm not too sure whether it's to do with the CPU (speed, # cores, cache size), GPU (chipset, VRAM, memory type) or even HDD (IDE vs SATA). What contributes to the ability to stream regular videos and, furthermore, high-definition videos online?

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• How to build a small network/server at home, basics

  - by Moe

  I'm one class away from my BA IT, I took several classes in general IT. Out of all the books I found just two to be really beneficial. I'm trying to get the hands on experience so my question is.... I want to build a small network in my home, wireless and also wired; printer, laptop, desktop, server (I have 4 1TB external drives of movies/music I want to be available to all computers) Where would I start from building a server with my hard drives, good modem, router, switch port, firewall internet speed/connection etc. This is my first project I want to try.

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• Problems to connect Java visualVM to a EC2-instance

  - by kasten

  I'm trying to profile a AWS EC2 instance via visualVM. The instance is in a securitygroup which allows all connections and i'm runing jstatd with a grant codebase "file:${java.home}/../lib/tools.jar" { permission java.security.AllPermission; }; policy on it. When i try to connect from my local machine with visulVM nothing happens. When i use jps i get the following response $ jps -l -m -v rmi://ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com Error communicating with remote host: Connection refused to host: xxx.xxx.xxx.xxx; nested exception is: java.net.ConnectException: Connection timed out But i can ssh into the instance and use jps locally. Has anyone a pointer in which direction i can debug further?

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• Visual Studio 2012 Installation fails on Windows 7

  - by Vipul

  I am trying to install Visual Studio 2012 on Windows 7 Home Premium 64-bit machine, but installation fails. I tried to install all version (premium, ultimate etc..) but getting below error. Machine is not domain joined and logged in as administrative user. I was using Security Essentials but turn it off before the installation. Installation source is from MSDN. Error log is too big to upload, important portion from the log: [2B6C:2580][2012-09-16T23:06:40]: MUX: ERROR: The type initializer for 'System.Windows.Media.FontFamily' threw an exception.

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• Can I password protect a Publisher file?

  - by tombull89

  I was asked ealier this week if it was possible to password protect a Microsoft Office 2007 Publisher document. I was under the impression that it would be like protecting a Word document, by going to Office Save As Word Document Tools General Options and creating a password to modify, like shown below. This also works for Excel documents. However, in Publisher 2007 the option is not there. The only option under "Tools" is "Map network drive". We overcame the issue as saving as a PDF and distributing that, but is there a way to do what we want?

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• Sending mail to local address crashes web server (sendmail)

  - by deceze

  When trying to send mail automatically from a script at example.com via PHP's mail() to [email protected], the Apache server throws an Internal Error. I believe internally it is configured to use sendmail. The message gets dropped into ~/dead.letter and the general error log reads: [Wed May 12 11:26:45 2010] [error] [client xxx.xxx.xxx.xxx] malformed header from script. Bad header=/home/example/dead.letter... S: /home/example/www/test.php Trying any other address, not @example.com, works just fine. I have googled and serverfaulted for solutions, but they all require to edit configuration files in /etc/mail and similar system places, which is not an option, since this problem occurs on a shared host in which I only have access to ~/. Does anyone have a suggestion?

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• Bad temperature sensors on Foxconn motherboard?

  - by Gawain

  I have a system with a Foxconn V400 series motherboard and AMD Athlon 3000+ processor. Ever since I got it a few years ago the fans (particularly the CPU fan) have been really loud. So recently I installed SpeedFan to see why they were running so fast. SpeedFan reported the CPU temperature to be 32C, and one motherboard sensor at about 26C. But the other two motherboard sensors were reporting 78C and 64C respectively. Naturally the fans were both maxed out because of this, with the CPU fan at 5800rpm and the case fan at 2400rpm. I opened the case and everything inside was literally cool to the touch, with the exception of the CPU heatsink which was slightly warm, but nowhere near 78C. It seems like the temperature sensors are either defective or being read incorrectly. Is there some way I can decrease my fan noise without risking damage to my processor? Some way to ignore those two temp sensors? Any help would be greatly appreciated.

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• samba shares dissapear everynight

  - by Crash893

  I have ubuntu 8.04lts and recently a weird problem has been cropping up. every night something happens and in the morning my coworkers cant see the shares. If i try to remote into the machine via ssh i don't get a prompt . when i rebooted the machine i would get a "video cannot be displayed in this mode" screen and no other activity on the box. I booted from grub into recovery and tried doing a package repair (keeping my smb.conf) and that didn't seem to do anything after a few other reboots I was able to get it to come up (im not sure what i did) yesterday it did teh same thing i booted to recovery then did a repair xserver and it came right up so i thought that resovled the issue but then today same thing anyone have any idea on what i can look for (im very new to linux in general) worst case sennerio can i just reinstall ubuntu over again with out blowing out the data?

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• ubuntu server 10 - slow and can't remove desktop environment

  - by Alex

  i'm running ubuntu server 10.10 with the desktop environment. simple page requests are taking over 5 seconds even when connecting to the server through our local network. i believe this is partially related to having the desktop environment installed, as the server worked faster (but not as fast as it should considering that it's on the local network), but tasksel fails every time (aptitude failed 100). my knowledge of networking and linux in general is limited. would really appreciate ideas on how i can troubleshoot this problem. oh also, in the system monitor, one of the processors is almost always around 100%. i doubt this is normal too....

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• Simulating an UNC path with a leading dot

  - by Uwe Keim

  Being a C# .NET Windows Forms developer, some customers are running our applications on an Apple OS X Mac inside a Parallels virtual machine. Parallels presents host folders to the guest Windows as UNC paths with a leading dot like \\.psf\Home\Some\More\Folders Now an application of us cannot handle the leading dot correctly when accessing files from these kind of shares ("Invalid URI, cannot analyze host name" exception). I want to debug and fix this issue, unfortunately I do have no Mac and Parallels around here to test it. My question is: Is there a way to "simulate" this kind of share on a normal Windows server or client so that I'll be able to debug my application with Visual Studio? What I tried so far: I already tried to edit my HOSTS file to contain an entry like # ... 127.0.0.1 .psf # ... but Windows just seems to not recognize the share at all.

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• Control truetype font tracking in fontforge

  - by ??O?????

  Hello. I'm designing a font intended to be used mainly as a subtitle font. It's a sans-serif font not unlike Helvetica. The em size is 2000 (I know it "should" be 2048 for a truetype font), the ascent/descent are 1600/400. Most glyphs don't go higher than 1450 though, with the exception of accented Latin characters. There lies the issue: when my font includes accented Latin characters, the tracking (line -of-text intradistance, but correct me if I got the term "tracking" wrong) skyrockets. I can't seem to find a way to control that. As my intended design goes, I don't mind if I have a descender (e.g. "g") above and an accented capital Latin letter below and they almost touch. It's something that does not happen very often, anyway. How can I control tracking? It seems it's auto-calculated.

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• ApplicationPool in IIS 7.5 crashes with identifty set to NetworkService

  - by Ravi

  We have a web application running on IIS 7.5 with the identity of the Custom Application Pool set to NetworkService. This was working fine for some days and now the application pool has gone in to a stopped state. The following error message is displayed in the Event Viewer Faulting application name: w3wp.exe, version: 7.5.7600.16385, time stamp: 0x4a5bcd2b Faulting module name: ntdll.dll, version: 6.1.7600.16559, time stamp: 0x4ba9b29c Exception code: 0xc0000005 Fault offset: 0x00038c19 Faulting process id: 0xa28 Faulting application start time: 0x01cbb2e5707aa2b2 Faulting application path: C:\Windows\SysWOW64\inetsrv\w3wp.exe Faulting module path: C:\Windows\SysWOW64\ntdll.dll Report Id: ae3f0610-1ed8-11e0-abf8-000c297f918f We are able to start the application pool only after changing the identity to LocalSystem. Why does the application pool fails to run with identity set to NetworkService. Can any one help us resolving this issue?

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• dependency hell

  - by Delirium tremens

  I'm trying to install empathy. Current version has to be installed from source, but needs a list of things that have to be installed one by one. Previous version is in repository, but blinks (opens, then right after that, closes). Previous version of the previous version: apt-cache search -showpkg empathy shows general empathy information and a telepathy too, but not the rpm file name taking the rpm file name from a Google search result, apt-get install package=empathy-2.30.1-2pclos2010 says package package (twice, really) not found installing apturl, clicking the rpm file link, opening it with apturl, installation gui starts, but fails opening the rpm file with Synaptic doesn't work opening the rpm file with /usr/bin/apt-get doesn't work What now?

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• How to automaticaly mount luks-partition only when disk is plugged in

  - by Frederick Roth

  I have the following scenario: I want to automatically backup some data from my Laptop(Fedora Core 17) to a external encrypted(luks) hard disk. The disk can be opened by a key file, which lies on the also encrypted root partition of my laptop. The hard disk is attached to my docking station and therefore only "present" when I am at home (which is approximately 1/2 of the time the Laptop runs) I have everything set up the way I want it with one exception. I don't get a decent way to mount the hard disk automatically at boot if and only if it is present. If I add it to crypttab and fstab without noauto it tries to mount it at boot and takes a lot(!) of time and error messages when it is not present. If I add noauto, well it does not mount automatically ;) Is there a way to configure luks/crypttab to do the following: check whether the disk is present if yes: decrypt/mount if no: just don't

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