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How do I completely self study computer science?

- by Optimus

Being a completely self taught programmer I would like it if I could better myself by self-learning computer science course taught to a typical CS grad. Finding different resources on internet has been easy, there is of course MIT open course ware, and there are Coursera courses from Stanford and other universities. There are numerous other open resources scattered around the Internet and some good books that are repeatedly recommended. I have been learning a lot but my study is heavily fragmented, which really bugs me, I would love If somewhere I could find a path I should follow and a stack I should limit myself to so that I can be sure about what essential parts of computer science I have studied and systematically approach those I haven't. The problem with Wikipedia is it doesn't tell you whats essential but insists on being a complete reference. MIT open course ware for Computer science and Electrical Engg. has a huge list of courses also not telling you what courses are essential and what optional as per person's interest/requirement. I found no mention of an order in which one should study different subjects. What I would love is to create a list that I can follow like this dummy one SUBJECTS DONE Introduction to Computer Science * Introduction to Algorithms * Discrete Mathematics Adv. Discrete Mathematics Data structures * Adv. Algorithms ... As you can clearly see I have little idea of what specific subjects computer science consists of. It would be hugely helpful even if some one pointed out essential courses from MIT Course ware ( + essential subjects not present at MIT OCW) in a recommended order of study. I'll list the Posts I already went through (and I didn't get what I was looking for there) Computer science curriculum for non-CS major? - top answer says it isn't worth studying cse How can a self-taught programmer learn more about Computer Science? - points to MIT OCW Studying computer science - what am I getting myself into? Overview of computer science, programming

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IIS7 Custom ASP.NET Errors

- by Nathan Roe

I'm trying to setup a custom error page for the IIS 7 404.13 (Content length too large) error. Here's the relevant sections of my web.config file: <system.webServer> <httpErrors errorMode="Custom" existingResponse="Replace"> <remove statusCode="404" subStatusCode="13" /> <error statusCode="404" subStatusCode="13" prefixLanguageFilePath="" path="/FileUpload/Test.aspx" responseMode="ExecuteURL" /> </httpErrors> <security> <requestFiltering> <requestLimits maxAllowedContentLength="10240" /> </requestFiltering> </security> </system.webServer> The response that is being sent back to the server is blank. The Test.aspx file is not blank. Any idea what's going on here?

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IIS7 Recover Default Website

- by rideon88

So I deleted my default website by accident on a Windows 2008 server in IIS7. This is bad because I now lost my Exchange OWA virtual directories... users are not happy =(. Also lost my https certificate I'm pretty sure. So I'm hoping there is an easy way to recover all that stuff being that it's Windows 2008 and all... Any help appreciated. I have no idea where to start or how to recover any of this stuff besides creating a new site called default website and then hitting the MS Exchange manual on how to install OWA from scratch.

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iTunes 9.2 OS X - iTunes DJ not functioning correctly

- by David Sykes

I have been using iTunes on my Mac for 4 years now without any problems at all. Recently, however, the iTunes DJ function has started misbehaving. Instead of showing the 5 previously played songs, and 15 upcoming songs randomly selected from the playlist I have defined in the settings, it instead shows the 5 previously played songs, plus many more than 15 upcoming songs. In addition, the upcoming songs are not from the playlist, they are from about 7 or so albums, in album order. I have changed settings, change the source playlist, restarted iTunes, rebooted the machine. All with no change. Does anybody have any idea how to get this working again? Thanks, Dave

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help! corrupt file recovery

- by TheBumpper

My supervisor computer crashed last night, and I'm trying to help him out. He made an R script but when he tried to open it, it was empty. But for some reason the file is 7.9kb so it should not be empty i think... anyway when i tried to open it, Gedit gave this error: "The file you opened has some invalid characters. If you continue editing this file you could corrupt this document. You can also choose another character encoding and try again." and the options to encode the characters. It looked like this(with a red background): \00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\ My question is, is there a way to restore the file? i hope someone has a brilliant idea

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MySQL replication Slave_IO_Running: No

- by Christy

Hi all, I have two servers that I am trying to get replication of one database between. I found a setup guide on sourceforge that I followed and I have tried various other settings since then, but no matter what I do, when I start the slave, the 'Slave_IO_Running' setting is always No.... I have no idea why or what to look at, any suggestions are appreciated. The slave setup was: CHANGE MASTER TO MASTER_HOST='myserver.mydomain.net', MASTER_USER='slave_user', 'MASTER_PASSWORD='mypassword', 'MASTER_LOG_FILE='mysql-bin.000011', MASTER_LOG_POS=1368363 (last data from today, trying to do setup again. I deleted and recreated the database on the slave from a new dump and tried to redo the setup.) I have slave_user setup for %, localhost, and the specific IP of the slave computer but nothing seems to be working... Thanks in advance for any advice or suggestions

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Varnish VCL Reload Fails After Adding Second Backend

- by Andy

I have been running Varnish on my production server successfully for several weeks now. Now I'm trying to configure Varnish to use a second backend for certain requests. My original working VCL (/etc/varnish/default.vcl) begins like this: backend default { .host = "127.0.0.1"; .port = "8080"; } ...rest of VCL... And I'm changing it to: backend default { .host = "127.0.0.1"; .port = "8080"; } backend backend2 { .host = "12.34.56.78"; .port = "80"; } ...rest of VCL... When I reload the VCL file, I get the following: Command failed with error code 106 Failed to reload /etc/varnish/default.vcl. Any idea what the error could be, or how I can get more information on the problem?

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Test Driven Development (TDD) in Visual Studio 2010- Microsoft Mondays

- by Hosam Kamel

November 14th , I will be presenting at Microsoft Mondays a session about Test Driven Development (TDD) in Visual Studio 2010 . Microsoft Mondays is program consisting of a series of Webcasts showcasing various Microsoft products and technologies. Each Monday we discuss a particular topic pertaining to development, infrastructure, Office tools, ERP, client/server operating systems etc. The webcast will be broadcast via Lync and can viewed from a web client. The idea behind the “Microsoft Mondays” program is to help you become more proficient in the products and technologies that you use and help you utilize their full potential. Test Driven Development in Visual Studio 2010 Level – 300 ( Intermediate – Advanced ) Test Driven Development (TDD), also frequently referred to as Test Driven Design, is a development methodology where developers create software by first writing a unit test, then writing the actual system code to make the unit test pass. The unit test can be viewed as a small specification around how the system should behave; writing it first helps the developer to focus on only writing enough code to make the test pass, thereby helping ensure a tight, lightweight system which is specifically focused meeting on the documented requirements. TDD follows a cadence of “Red, Green, Refactor.” Red refers to the visual display of a failing test – the test you write first will not pass because you have not yet written any code for it. Green refers to the step of writing just enough code in your system to make your unit test pass – your test runner’s UI will now show that test passing with a green icon. Refactor refers to the step of refactoring your code so it is tighter, cleaner, and more flexible. This cycle is repeated constantly throughout a TDD developer’s workday. Date: November 14, 2011 Time: 10:00 a.m. – 11:00 a.m. (GMT+3) http://www.eventbrite.com/event/2437620990/efbnen?ebtv=F See you there! Hosam Kamel Originally posted at

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Getting error "No address associated with hostname: mod_unique_id: unable to find IPv4 address of "z

- by Eedoh

Hello. I'm trying to set up video surveillance system using ip cameras and zonealarm on Arch Linux. I set up fixed ip address, I've managed to get streams from cameras, etc. However, after restart of the machine, I can not start apache again. I checked configuration of rc.conf, and saw that static ip configuration has been deleted, and also secondary nameserver in resolv.conf. Tried to re-write these with correct parameters, but now with no effect. This is tail of my /var/log/httpd/error_log file, after /etc/rc.d/httpd restart attempt [Fri Jan 29 04:20:45 2010] [alert] (EAI 5)No address associated with hostname: mod_unique_id: unable to find IPv4 address of "zmhost" Configuration failed Anybody has an idea how could I fix this??

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Parsing scripts that use curly braces

- by Keikoku

To get an idea of what I'm doing, I am writing a python parser that will parse directx .x text files. The problem I have deals with how the files are formatted. Although I'm writing it in python, I'm looking for general algorithms for dealing with this sort of parsing. .x files define data using templates. The format of a template is template_name { [some_data] } The goal I have is to parse the file line-by-line and whenever I come across a template, I will deal with it accordingly. My initial approach was to check if a line contains an opening or closing brace. If it's an open brace, then I will check what the template name is. Now the catch here is that the open brace doesn't have to occur on the same line as the template name. It could just as well be template_name { [some_data] } So if I were to use my "open brace exists" criteria, it won't work for any files that use the latter format. A lot of languages also use curly braces (though I'm not sure when people would be parsing the scripts themselves), so I was wondering if anyone knows how to accurately get the template name (or in some other languages, it could just as well be a function name, though there aren't any keywords to look for)

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SQL SERVER – Effect of Collation on Resultset – SQL in Sixty Seconds #026 – Video

- by pinaldave

Collation is a very important concept but often ignored. I have often seen developers either not understanding this or ignored it – this is plain wrong. In simple word we can say Collation is the language or interpreting done by SQL Server. Well, in today’s SQL in Sixty Seconds we are going to observe how collation affects the resultset. Today’s blog post is inspired from my earlier blog post SQL SERVER – Effect of Case Sensitive Collation on Resultset. I strongly encourage you to read this earlier blog post for sample code as well additional explanation related to the concept shared in today’s SQL in Sixty Seconds. Here is the code used in the video. USE TempDB GO -- Sample Data Building CREATE TABLE ColTable (Col1 VARCHAR(15) COLLATE Latin1_General_CI_AS, Col2 VARCHAR(14) COLLATE Latin1_General_CS_AS) ; INSERT ColTable(Col1, Col2) VALUES ('Apple','Apple'), ('apple','apple'), ('pineapple','pineapple'), ('Pineapple','Pineapple'); GO -- Retrieve Data SELECT * FROM ColTable GO -- Retrieve Data SELECT * FROM ColTable ORDER BY Col1 GO -- Retrieve Data SELECT * FROM ColTable ORDER BY Col2 GO -- Clean up DROP TABLE ColTable GO Related Tips in SQL in Sixty Seconds: SQL SERVER – Effect of Case Sensitive Collation on Resultset Example of Width Sensitive and Width Insensitive Collation Collation and Collation Sensitivity – Quiz – Puzzle – 6 of 31 Change Collation of Database Column – T-SQL Script Find Collation of Database and Table Column Using T-SQL Default Collation of SQL Server 2008 Cannot resolve collation conflict for equal to operation If we like your idea we promise to share with you educational material. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Database, Pinal Dave, PostADay, SQL, SQL Authority, SQL in Sixty Seconds, SQL Query, SQL Scripts, SQL Server, SQL Server Management Studio, SQL Tips and Tricks, T SQL, Technology, Video

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BSOD error on Win7 ultimate

- by jim

BUG CHECK STRING = DRIVER_POWER_STATE_FAILURE BUG CHECK CODE = 0x0000009f PARAMETER 1 = 0x00000003 PARAMETER 2 = 0x85f05420 PARAMETER 3 = 0x82962ae0 PARAMETER 4 = 0x85aa2ab8 CAUSED BY DRIVER = ntkrnlpa.exe CAUSED BY ADDRESS = ntkrnlpa.exe+dcd10 FILE DESCRIPTION = NT Kernel & System Microsoft® Windows® Operating System Microsoft Corporation 6.1.7600.16385 (win7_rtm.090713-1255) 32-bit C:\Windows\minidump\111109-22198-01.dmp This is the BSOD mini dump that I have been getting recently. I was wondering if anyone had any ideas what would cause this. I just did a clean install of win7 ultimate 32 bit. I don't do a lot with this pc. Mostly surf the web and that's when it happens. My only guess is that the power supply is failing and I need a new one. I wanted to check here and see if anyone else had some other idea before I bought a new one. Thank you for any help you can give me.

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Is functional intellisense and code browsing more beneficial than the use of dependency injection containers

- by Gavin Howden

This question is really based on PHP, but could be valid for other dynamically typed, interpreted languages and specifically the methods of generating code insight and object browsing in development environments. We use PHPStorm, and find intellisense invaluable, but it is provided by some limited static analysis and parsing of doc comments. Obviously this does not lend well to obtaining dependencies through a container, as the IDE has no idea of the type returned, so the developer loses out on a plethora of (in the case of our framework anyway) rich documentation provided through the doc comments. So we start to see stuff like this: $widget = $dic->YieldInstance('WidgetA', $arg1, $arg2, $arg3, $arg4...)); /** * @var $widget WidgetA */ So that code insight works. In effect the comments are tightly bound, but worse they come out of sync when code is modified but not the comments: $widget = $dic->YieldInstance('WidgetB', $arg1, $arg2, $arg3, $arg4...)); /** * @var $widget WidgetA */ Obviously the comment could be improved by referencing a Widget interface, but then we might as well use a factory and avoid the requirement for the extra typing hints in the comments, and dic complexity / boiler plating. Which is more important to the average developer, code insight / intellisense or 'nirvana' decouplement?

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"TMGR is Missing" after repair-installing Windows XP

- by djzmo

Hello there, I have two OSes installed in my computer. - Windows XP Professional - Windows 7 Ultimate (Release Candidate 1/Build 7100) I used the Windows 7 boot loader by default to choose between OSes. When I was using my WinXP, my computer gets lagged suddenly and continuously, and the only way to fix it is by repair-installing it (because I've experienced this many times before, but without W7 installed). Everything goes OK. But when my XP was successfully reinstalled, I cannot boot my Windows 7 anymore. Every time I tried to boot the harddisk that contains W7, an error appeared. "TMGR is Missing". Now I have no idea how can I get back to my Windows 7. Any kind of help would be appreciated! :)

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SQL Sharding and SQL Azure…

- by Dave Noderer

Herve Roggero has just published a paper that outlines patterns for scaling using SQL Azure and the Blue Syntax (he and Scott Klein’s company) sharding api. You can find the paper at: http://www.bluesyntax.net/files/EnzoFramework.pdf Herve and Scott have also just released an Apress book Pro SQL Azure. The idea of being able to split (shard) database operations automatically and control them from a web based management console is very appealing. These ideas have been talked about for a long time and implemented in thousands of very custom ways that have been costly, complicated and fragile. Now, there is light at the end of the tunnel. Scaling database access will become easier and move into the mainstream of application development. The main cost is using an api whenever accessing the database. The api will direct the query to the correct database(s) which may be located locally or in the cloud. It is inevitable that the api will change in the future, perhaps incorporated into a Microsoft offering. Even if this is the case, your application has now been architected to utilize these patterns and details of the actual api will be less important. Herve does a great job of laying out the concepts which every developer and architect should be familiar with!

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Virtual audio driver for Windows?

- by Ognjen

Is there any (possibly free or open-source) virtual WDM audio driver for Windows, with additional processing plugins, which would add one more layer between windows applications and actual sound card's WDM audio driver, allowing to: Add software DSPs to general audio output. I would like to be able to use custom effects, like compressor, or stereophonic-to-binaural converter for listening online's streaming media on headphones, etc. Connect its output to some custom buffer instead of the sound card. For example, to be able to record audio, or to send audio via wireless connection to some other wireless source? Virtual audio driver was just my idea how to solve these issues - if you know other way, please share your knowledge. I need this for Windows 7 and/or Windows XP.

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DD-WRT Connection Leak

- by Nerdfest

I have DD-WRT installed on a WRT54G v1.1, and a few of the features seem to cause connections to leak. I've configured it for 1024 connections with TCP/UDP timeouts of 180/30. I've tried higher values as well. Anyway, if I use the Bandwidth tab to monitor the bandwidth usage, the number of connections to my workstation reaches about 450. Is this normal? If not, any idea how to get the connections to either not be created, or to drop much faster?

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What are industry standards and professional best practices in network hosts naming? [closed]

- by Ivan

Possible Duplicate: Naming convention for computers It seems an important and difficult dilemma for me how to name network hosts (routers, servers (while a server can be a router and host diverse services at the same time), virtual machines (while they host important services and can migrate), workstations and notebooks (using pc-username is not the best idea as users may change), printers & MFUs, surveillance IP cameras, etc). Are there known and accepted best practices for this task? Excuse me if there already was a similar question here (I think it probably was), I haven't found it.

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Redundancy and Automated failover using Forefront TMG 2010 Standard between Production-DR site ?

- by Albert Widjaja

Hi, I'm using MS TMG 2010 Standard as my single firewall to publish my Exchange Server and IIS website to the internet, however it is just one VM in the DMZ network with just one network card (vNIC), what sort of redundancy method that is suitable for making this firewall VM redundant / automatically failover in my DR site ? Because it is very important in the event of disaster recovery all important email through various mobile device will still need to operate and it is impossible if this TMG 2010 VM is offline. is it by using: 1. Multicast NLB 2. Any other clustering 3. VMware HA / FT (one VM in production, the other VM in DR site with different subnet ?) Any suggestion and idea willl be appreciated. Thanks

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Online scoreboard in Python?

- by CorundumGames

So my friend and I are working on an arcade-style game in Python and Pygame. We're beginning to look at the feasibility of an online leaderboard, given our current programming backgrounds. Such a leaderboard would have the following requirements/features; The ability to search through demographics like region, country, platform, game mode, recentness ("best scores this month") and difficulty. (e.g. to make it possible for someone to say "I'm the best player in Italy!" or "I'm the best Linux player in South America!") Our game will not have online multiplayer, so no need to worry about that. We don't expect the game to be a million-dollar hit. We want the scores to be accessible both from in-game and the website. We would like some semblance of security to make sure no one plugs fake scores into the system. This is our present situation; Neither I nor my friend have any network programming background. All I really know is that sockets are low-level, HTTP is high-level. I happen to know that the Google App Engine might be useful for something like this, and I'm really thinking about going with that. We're not sure how we would store all the high score data. Our game will be free and open source (though we might keep the components that submit the high scores closed-source). Aside from all of this, we don't really have any idea where to begin. Any thoughts?

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Real VNC won't connect to OS X Leopard VNC server

- by Pselus

I have 3 machines. 2 Macs, 1 Dell. 1 of the Macs is running as a VNC server and the other Mac connects great with Chicken of the VNC. Sadly, this app does not exist for Windows so I'm using RealVNC to view from Windows. I connect the exact same way as with the Mac, but on Windows when it connects, I see a program pop up and then immediately close. I have tried all options available on RealVNC and nothing changes things. Anyone have any idea what I can do to fix this?

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Microsoft DNS/DHCP using DDNS - Domain Suffix issue

- by Samuurai

I have an issue with our Microsoft DNS server, we're getting the dreaded "DNS Update Failed" in the DHCP logs. We have two forward lookup zones, blah.com and somethingelse.com - blah.com is the one I want the workstations/DHCP to dynamically update. However, I can only get it to work if I specify blah.com as the domain suffix in the network connection properties. I can think of two possible solutions, but have no idea how to implement them or if they're possible: 1) Designate a blah.com as the "default" zone somehow on the DNS server, so all updates are sent to that zone unless the client's domain suffix is somethingelse.com 2) Use DHCP option 15, which sets the domain suffix. - We're currently doing that, but it doesn't seem to take it into account when updating DNS. Can anyone please shed some light? Thank you.

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Practical mysql schema advice for eCommerce store - Products & Attributes

- by Gravy

I am currently planning my first eCommerce application (mySQL & Laravel Framework). I have various products, which all have different attributes. Describing products very simply, Some will have a manufacturer, some will not, some will have a diameter, others will have a width, height, depth and others will have a volume. Option 1: Create a master products table, and separate tables for specific product types (polymorphic relations). That way, I will not have any unnecessary null fields in the products table. Option 2: Create a products table, with all possible fields despite the fact that there will be a lot of null rows Option 3: Normalise so that each attribute type has it's own table. Option 4: Create an attributes table, as well as an attribute_values table with the value being varchar regardless of the actual data-type. The products table would have a many:many relationship with the attributes table. Option 5: Common attributes to all or most products put in the products table, and specific attributes to a particular category of product attached to the categories table. My thoughts are that I would like to be able to allow easy product filtering by these attributes and sorting. I would also want the frontend to be fast, less concern over the performance of the inserting and updating of product records. Im a bit overwhelmed with the vast implementation options, and cannot find a suitable answer in terms of the best method of approach. Could somebody point me in the right direction? In an ideal world, I would like to offer the following kind of functionality - http://www.glassesdirect.co.uk/products/ to my eCommerce store. As can be seen, in the sidebar, you can select an attribute the glasses to filter them. e.g. male / female or plastic / metal / titanium etc... Alternatively, should I just dump the mySql relational database idea and learn mongodb?

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mysql UDF : fopen = permission denied

- by lindenb

Hi All, this is question I already asked on SO but I wonder if this could be a SysAdmin problem. I'm trying to create a mysql UDF function , this function calls "fopen/fclose" to read a flat file stored in /data. But using errno (yes, I know it is bad in a MT program...) I can see that the function cannot open my file: "Permission denied" I tried to do a chmod -R 755 /data (as well as 777, chown -R mysql:mysql /data etc...) but it didn't change anything. when I copied the flat file to /tmp : OK, my UDF was able to 'fopen' the file. I'm puzzled. currently , I've got: drwxrwxrwx 4 pierre root 4096 2010-05-26 16:51 /data drwxrwxrwx 3 pierre root 4096 2010-05-18 09:41 /data/dir1 drwxrwxrwx 3 pierre root 4096 2010-05-18 09:41 /data/dir1/dir2 drwxrwxrwx 4 pierre root 4096 2010-05-18 10:27 /data/dir1/dir2/dir3 -rw-r--r-- 1 pierre root 50685268 2005-12-10 00:01 /data/dir1/dir2/dir3/myfile.txt Any idea ?

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Linode - Centos 5.5 -

- by Marcus West

Hi, I rather foolishly undertook to install a control panel on a Linode. I opted to use CentOs 5.5 (either ordinary or 64 bit) but I am like a monkey playing a reward game... I have some idea of what I am doing, but not enough.... In certain areas I am hopeless....do I install Webmin/virtualmin, or ISP Config..... ISP Config 2 or 3? I would employ someone to help, but how do i find the right person? Where can i learn the ropes on all this? There seems to be no systematic training, and even when I try to research college courses in the UK, I am none the wiser as to where I could go to learn how to run a Linux server..... Has anyone any pointers? Right now I am looking at th esecurity aspects of the server.....rkhunter , denyhosts etc... Any advice on installing and maintaining these things? Cheers marcus

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