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• Unable to access a registry key

  - by gix

  I wondered why some file associations were broken and stumnled upon a nasty problem: I cannot access the key HKEY_CURRENT_USER\Software\Classes. As you can see above, I cannot view its current permissions, nor its owner (which should by SYSTEM). And no matter what I tried I'm unable to fix it. Trying to change the owner gives me a permission denied (also when trying from the Administrator account). RegDacl, which seemed to help another user, also aborts with a permission denied error. Any suggestions how to repair this? If I cannot repair this I guess I have to dump that user account and create a new one. Are there any "diff-like" tools out there to help copy over registry keys?

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• Need a solution to stop students from rotating screen on laptops with intel graphics

  - by testguy

  We have some students who have figured out how to rotate the screen using either the hotkey combination or right click context menu. It's easy to fix but it's time consuming because no matter how many times I tell people how to fix it there's always someone that will come up to me. Now I need two things. First, is there a way to disable screen rotation? Second, I need a script to reset the screen resolution to normal on logon and logoff. The solutions need to be able to be deployed from a Win2003 server to WinXP clients. I have way too many computers to go through by hand to uncheck enable hot keys on the intel control panel.

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• SQL Server Configuration Manager menu won't show up

  - by Aurelien Gasser

  I'm running a Windows 8 VM on a MacBook using Parallels Desktop 9. On this Windows VM, I have a SQL Server instance running perfectly. However, when I launch SQL Server Configuration Manager, and I want to enable an IP configuration, the Enable menu options are invisible : Here is a screenshot : http://i.imgur.com/PY7qGup.png (I don't have enough reputation to display the image inline) When I click the arrow, a contextual menu should appear with 2 choices "Yes" or "No". Instead, a tiny contextual menu appears, but it's empty. I tried using my keyboard tab/space/arrows keys without success. Has anyone faced/solved the same problem ?

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• A good approach to db planing for reporting service

  - by Itay Moav

  The scenario: Big system (~200 tables). 60,000 users. Complex reports that will require me to do multiple queries for each report and even those will be complex queries with inner queries all over the place + some processing in PHP. I have seen an approach, which I am not sure about: Having one centralized, de-normalized, table that registers any activity in the system which is reportable. This table will hold mostly foreign keys, so she should be fairly compact and fast. So, for example (My system is a virtual learning management system), A user enrolls to course, the table stores the user id, date, course id, organization id, activity type (enrollment). Of course I also store this data in a normalized DB, which the actual application uses. Pros I see: easy, maintainable queries and code to process data and fast retrieval. Cons: there is a danger of the de-normalized table to be out of sync with the real DB. Is this approach worth considering, or (preferably from experience) is total $#%#%t?

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• What resources will help me understand the fundamentals of Relational Database Design.

  - by Rachel

  This are few of the fundamental database questions which has always given me trouble. I have tried using google and wiki but I somehow I miss out on understanding the functionality rather than terminology. If possible would really appreciate if someone can share more insights on this questions using some visual representative examples. What is a key? A candidate key? A primary key? An alternate key? A foreign key? What is an index and how does it help your database? What are the data types available and when to use which ones?

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• Easiest way to rename a model using Django/South?

  - by vaughnkoch

  Hi everyone, I've been hunting for an answer to this on South's site, google, and SO, but couldn't find a simple way to do this. I want to rename a Django model using South. Say you have the following: class Foo(models.Model): name = models.CharField() class FooTwo(models.Model): name = models.CharField() foo = models.ForeignKey(Foo) and you want to convert Foo to Bar, namely class Bar(models.Model): name = models.CharField() class FooTwo(models.Model): name = models.CharField() foo = models.ForeignKey(Bar) To keep it simple, I'm just trying to change the name from Foo to Bar, but ignore the 'foo' member in FooTwo for now. What's the easiest way to do this using South? a) I could probably do a data migration, but that seems pretty involved. b) Write a custom migration, e.g. db.rename_table('city_citystate', 'geo_citystate'), but I'm not sure how to fix the foreign key in this case. c) An easier way that you know? Thanks!

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• Are you supposed to type '6' with the left hand or the right hand?

  - by Joey Adams

  A few weeks ago, I did a Google Images search for keyboard finger charts to see which fingers I'm supposed to be using to type which keys. According to the charts, '6' is supposed to be typed with the right hand: (as shown on en.wikipedia.org/wiki/Typing) However, today I spotted a split keyboard in a store with the '6' on the left side of the split. Indeed, an image search for split keyboards indicates that this is the norm: (as shown on en.wikipedia.org/wiki/Microsoft_Natural_keyboard) When doing touch typing "correctly", should I go with the finger charts (type 6 with my right hand), or should I go with the split keyboards (type 6 with my left hand)? <troll> Is this just another example of Microsoft not following the standards? </troll>

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• Safari/Chrome (Webkit) - Cannot hide iframe vertical scrollbar

  - by BrainCore

  Hello, I have an iframe on www.mydomain.com that points to support.mydomain.com (which is a CNAME to a foreign domain). I automatically resize the height of my iframe so that the frame will not need any scrollbars to display the contained webpage. On Firefox and IE this works great, there is no scrollbar since I use <iframe ... scrolling="no"></iframe>. However, on webkit browsers (Safari and Chrome), the vertical scrollbar persists even when there is sufficient room for the page without the scrollbar (the scrollbar is grayed out). How do I hide the scrollbar for webkit browsers? Thanks, Ken

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• What is the method to reset the Planar 1910m monitor?

  - by Richard J Foster

  My monitor (a Planar, apparently model number PL1910M) is not working. (It is flashing a green / orange sequence which I believe to be an error code. The sequence, in case it helps consists of orange and green three times quickly followed by a longer orange, then another green followed by a long period where both colors appear to be present). I vaguely recall a co-worker suffering from a similar problem, and our IT department "resetting" the monitor by holding down a certain set of keys as they apply power. Unfortunately, I do not remember what that key sequence was, our IT department is not responding, and the Planar web site is blocked by the content filtering firewall we have in place! What is the sequence to perform the reset? (For bonus geek-credit, what does the code mean... as if it indicates a blown component clearly a reset will not help me. ;-))

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• How to backup MySQL (mysqldump) when Memcached installed?

  - by cewebugil

  The server OS is CentOS, with Memcached installed Before Memcached installed, I use mysqldump -u root -p --lock-tables --add-locks --disable-keys --skip-extended-insert --quick wcraze > /var/backup/backup.sql But now, Memcached has been installed. According to Wikipedia; When the table is full, subsequent inserts cause older data to be purged in least recently used (LRU) order. This means new data entry is not directly saved in MySQL, but saved in Memcached instead, until limit_maxbytes is full, the least accessed data will be saved in MySQL. This means, some data is not in the MySQL but in Memcached. So, when backup, the new entry is not in the backup data What is the right way to backup?

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• How to access USB stick content from VMWare running Ubuntu 10.10?

  - by JVerstry

  Hi, I am running Ubuntu 10.10 via VMWare under Windows 7. I have followed the procedure to install the USB stick. It is now connected to the host. However, I don't know how to access the content of the stick. My Google research indicates that this may be a mounting issue. I read somewhere that I should check /proc/bus/usb, but the usb directory does not exist in /proc/bus. Unfortunately, I am not a Linux expert at this. The ultimate issue I am trying to solve is the one describe here. I am trying to use vi to create ~/.vmware/config, but it is virtually impossible to use vi, since I don't have access to the arrow keys (chicken & egg problem). I have created the config file on my usb stick and want to copy it where it should be. Thanks!

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• Database Design Question

  - by deniz

  Hi, I am designing a database for a project. I have a table that has 10 columns, most of them are used whenever the table is accessed, and I need to add 3 more rows; View Count Thumbs Up (count) Thumbs Down (Count) which will be used on %90 of the queries when the table is accessed. So, my question is that whether it is better to break the table up and create new table which will have these 3 columns + Foreign ID, or just make it 13 columns and use no joins? Since these columns will be used frequently, I guess adding 3 more columns is better, but if I need to create 10 more columns which will be used %90 of the time, should I add them as well, or create a new table and use joins? I am not sure when to break the table if the columns are used very frequently. Do you have any suggestions? Thanks in advance,

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• Ruby on Rails and database associations

  - by Marco

  Hi to all, I'm new to the Ruby world, and there is something unclear to me in defining associations between models. The question is: where is the association saved? For example, if i create a Customer model by executing: generate model Customer name:string age:integer and then i create an Order model generate model Order description:text quantity:integer and then i set the association in the following way: class Customer < ActiveRecord::Base has_many :orders end class Order < ActiveRecord::Base belongs_to :customer end I think here is missing something, for example the foreign key between the two entities. How does it handle the associations created with the keywords "has_many" and "belongs_to" ? Thanks

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• cygwin rsync over ssh very slow

  - by Waleed Hamra

  I have 2 machines running Windows Xp SP3. I have cygwin installed on both, version 1.7. I have rsync and ssh installed on both, and configured using default settings as per ssh-host-config and ssh-user-config programs provided. I moved the public keys into their respective locations, and basically ssh is working fine. i began an rsync operation, using: rsync -av --delete --hard-links local_dir username@other_machine:/some_dir well... on both machines, the processor is running near idle, no heavy usage. I checked IO using process explorer on both machines, and that too is at normal levels (1~2 MB/s), so I can't see where the bottlenecks are, because network performance is aweful. I'm not going over 1MB/s... when a normal file copy using windows sharing achieves some ~10 MB/s.. What could be wrong?

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• Weird windows quirk when renaming file

  - by Roy Rico

  Hi, I am finding when I try to rename a file in windows 7, i typically select the file i want to rename, hit F2 (rename) and type the new name. I've been getting this weird bug which the while file name gets selected again, sometimes right in the middle of me typing. I can sit there and watch it reselect the entire filename every second or so as if someone is invisibly hitting control+a while type. I have tried making sure that my keys aren't being pressed, and also have even gotten a new keyboard and this problem still consists. I know it'll probably be a long shot, but just hoping someone's seen this issue and has a resolution. UPDATE: This is on a desktop machine, not a laptop, so there's no issue with Trackpad.

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• Is it faster to create indexes before or after data loading in MySQL?

  - by Josh Glover

  I have a data replication process that drops and recreates a few tables in a target database, then loads them up with data from a source database (running on another host, but that is immaterial to the question at hand). The target database does need primary keys and a few other indexes on its tables, but not during the data loading. I'm currently loading all of the data, then creating the indexes. However, index creation takes a pretty long time--30 minutes of my data loader's 5 and a half hour running time. My intuition tells me that creating the indexes at the end should be faster than creating them first, since the index would need to be rewritten with each insert. Can anyone tell me for sure which way is faster? FWIW, I'm running MySQL 5.1 with InnoDB tables.

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• ^+Left Arrow and ^+Right Arrow suddenly stopped working on OS X

  - by user31122

  Hello. I'm not really sure what to make of this. The key combination of ^? and ^? have stopped working for one of the two users on my OS X installation. I use these keys all the time (switching tabs in terminal, IntelliJ primarily), and it's driving me crazy. On one user account, it works fine. On the other, it doesn't. This happened today and nothing significant comes to mind that would have caused some weird keybinding issue. If anyone has heard of or experienced anything like this, I would very much appreciate your advice! Thanks.

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• ^+Left Arrow and ^+Right Arrow suddenly stopped working on OS X

  - by user293261

  Hello. I'm not really sure what to make of this. The key combination of ^← and ^→ have stopped working for one of the two users on my OS X installation. I use these keys all the time (switching tabs in terminal, IntelliJ primarily), and it's driving me crazy. On one user account, it works fine. On the other, it doesn't. This happened today and nothing significant comes to mind that would have caused some weird keybinding issue. If anyone has heard of or experienced anything like this, I would very much appreciate your advice! Thanks.

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• How do you open a folder in OSX using the keyboard?

  - by Daniel T.

  On Windows, pressing enter when you highlight on a folder in Windows Explorer will open that folder. On OSX, pressing enter when you highlight a folder edits the folder's name (like F2 in Windows). Is there a keyboard shortcut to do the same thing on Windows, so that you'll open the folder? It doesn't have to be enter, but I'd like to know if there's another hotkey that does it. The reason why I ask is because I like to navigate through deep folder structures by using the arrow keys for navigation and enter to drill down into them.

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• Mouse works fine but keyboard (not wireless) not responding to anything

  - by Christine Boeke

  I read previous questions like mine and looked to see if keys were depressed and checked to make sure the mouse key was off in the system preferences. The mouse works just fine but the keyboard seems to be dead. I plugged in another keyboard and it responded identically. Is it something in the Desktop itself? Could I need a technician? I have searched for answers on line and had no success. Thanks!

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• How to delete refClass record in Doctrine?

  - by terrani

  Hi all! I have many-to-many relations with the following tables. post tag post_tag I created three classes with Doctrine, so I have the following classes as well. BasePost BaseTag BasePostTag in the setUp() method, I defined relations. I like to delete tag record when I delete post record. So I simply put cascade as descirbed on Doctrine document. $this->hasMany("Tag as Tags",array( 'refClass' => 'PostTag', 'local'=>'object_id', 'foreign'=>'tag_id', 'cascade'=> array('delete') )); it works without a problem. My questions is, how do I delete a record from post_tag table? Do I need to create a query myself?

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• Enabling Compiz Viewport Switcher key bindings

  - by David Moles

  I'm running compiz 0.8.2 with compizconfig on Scientific Linux 6.2 with Gnome 2.28.2. In the compizconfig "General Options" I have "Desktop Size" set as follows: Horizontal Virtual Size: 6 Vertical Virtual Size: 1 Number of Desktops: 1 This gets me the layout I want, i.e. 6 workspaces in a horizontal layout. Ctrl-alt-cursor-keys work fine for switching between them. However, I can't figure out how to get key bindings for specific workspaces. I've tried enabling "Viewport Switcher" in compizconfig, and tried various combinations both in "Number-based viewport switching" and "Go to specific viewport", to no apparent effect. My first thought was that something else was eating the specific key bindings I chose, but I think I've tried every combination of shift, control, alt and super (i.e., the Windows key) by now. I tried setting 6 desktops under "General Options" instead of one desktop with horizontal virtual size 6, but that doesn't seem to make a difference either. What am I missing?

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• Windows XP Activation failed, now what?

  - by user26379

  I have a computer with (presumably unlicensed) Windows XP. The activation (over the internet) failed, and I now I cannot get into Windows. After calling Microsoft, it seems like I will have to reinstall everything and install a freshly bought operating system. What are my options here? Is it worth trying the millions of keys and key generators out there? EDIT: I have no way of contacting the manufacturer (it's a no-name box, definitely not Dell, HP or IBM). Would there actually be a key supplied with my version of XP? If its not genuine, wouldnt I just have any old key? And that key would fail activation any way?

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• Rsync and Windows 7

  - by Nate

  Can someone give me any tips on setting up some sort of Rsync server/client on Windows 7 to run rsync between both my web hosting server, and a backup server that I have running Ubuntu? I've tried setting it up with this tutorial: http://www.youtube.com/watch?v=CvwdkZLNtnA Using copssh, and cwrsync. Ran into all sorts of troubles, including not being able to get cwrsync to run (it installs properly, but never starts up), and copssh not generating the keys at all. The guy was running Windows Server 2003, though, so I'm guessing the problems could just be because I'm running Windows 7. I've been trying to set it up with my Windows machine being the rsync server, and then Ubuntu and my webhosting VPS as the clients, but I realize it may be easier (and make more sense) to just setup the rsync server on Ubuntu, and then an rsync client on Windows 7? Can anyone point me in the right direction? I'm thinking of using this guide: http://www.gaztronics.net/rsync.php It seems a bit outdated, though.

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• Same command on multiple servers

  - by w00t

  Hello everyone. I'm just wondering if there is any fellow sysadmin with the need to execute one command on multiple servers. If so, what technique are you using? I have grown tired to ssh-ing to 3-5 servers and executing the same thing over and over again, so I'm thinking to make my life easier. Also, I think I should create keys so I don't have to enter passwords anymore (though I'm using root). After 2 years of doing this, I kind of developed a laziness. I googled it up, I know about cssh, pssh, tentakel (this one seems cool), and the more pro-genre - Puppet (of which I just heard of, didn't invest the time to read the docs). BTW, I'm using XP+putty, so if there is any putty-cool-thingy available, that's welcome too. If not, I can always ssh to one server and from there start my rest-of-the-servers-conquest :) *evil* Hit me up. Thanks.

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