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• Embedded linux Development learning

  - by user1797375

  I come from a windows background and i am proficient with the .net platform. For work, i need to bring up a custom embedded system platform. We have bought the pandaboard ES as the test platform. The application is to stream images over the wifi. If you think about it, we are building something similar to a netgear router - the only difference being when you log into the device it serves images. Because my background is in windows i am not quite sure how to start off with embedded linux development. in reading through various sites i have come to the conclusion that going to linux as development host is the best option. Can some one point to me in the right direction regarding the set up. I have a windows machine that will be used for development purposes. I can either do a virtual box or setup a partition for linux. But the finer details are what throwing me off..what i need to know is 1) once i install linux what other software do I need - Code blocks, 2) what about toolchain 3) How to debug - through serial port ? 4) Is there a way to send the image built directly to the CF card? Thanks

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• Apache + mod_php Ignores SUID?

  - by profitphp

  Does apache or mod_php cause a SUID flag to be ignored when using the shell_exec command from a web accessed PHP script? I'm trying to allow a web accessible PHP script to rename some files which the apache user does not have write access to. I don't want to give it access to write these, as I only want one controlled script to be able to do this. I'm trying to avoid SUDO and the config needed or the headache/insecurity of using a que called from a privileged users cron, and it seemed like I should be able to use SUID to accomplish this. If you need more info, I've got a similar question open over here, but I think its too detailed and people are not seeing what I'm asking. http://stackoverflow.com/questions/6432931/suid-issues-with-php-apache

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• Postgresql 9.2 where is the initdb located on Ubuntu

  - by thanikkal

  I am trying to install postgres on EC2 / EBS. I am following this article and stuck at the following step. sudo su - su postgres - /usr/pgsql-9.0/bin/initdb -D /pgdata I cant find the initdb command located at the stated location, matter of fact i cant find the pgsql* directory at all under /usr folder. Was this changed for Postgres 9.2 or is there an alternate command that would help me initdb? edit 1: I know the folder pgsql-9.0 is version specific, so i was expecting to see more like pgsql-9.2 or similar.

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• Apache Solr: What is a good strategy for creating a tag/attribute based search for an image.

  - by Development 4.0

  I recently read an article about YayMicro that descries how they used solr to search their photos. I would like doing something similar (but on a smaller scale). I have figured out how to have solr to search text files, but I would like to learn what the best way to associate images with semi structured/unstructured text. Do I create an xml file with an image link in it? I basically want to input a search string and have it return a grid of images. Yay Micro Article Link

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• Is it possible to rent an IP address to mask the server real IP address?

  - by net-girl

  A customer would like to lease an IP address and point it to a dedicated web server with the intention of "masking" the server's IP address so it would be difficult to tell where the site is hosted. I found a company that leases IP addresses here: http://www.webhostingtalk.com/showthread.php?t=1191688 Is this even possible? Can they rent an IP address from a 3rd party in order to hide the server's IP address? Update: My client will be hosting a government leaks site and is trying to become Raid-Proof similar to what the pirate bay did: http://torrentfreak.com/pirate-bay-moves-to-the-cloud-becomes-raid-proof-121017/ Only that I'm worried about using a reverse proxy because of the latency it could cause having the app servers hosted in one data center and the load balancer/reverse proxy in other and also having to pay twice for bandwidth.

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• Postfix: how to use simple file for SASL authentication?

  - by Jonathan

  I'd like to run Postfix on a Debian VPS to send e-mails from my application. The application (running on other VPSes) would connect to Postfix via SMTP. Postfix does not have to handle incoming email; it's just about sending the outgoing messages. To prevent being an open relay, SASL authentication should be used. However, I don't want to run Dovecot or MySQL for SASL authentication. How can I setup SASL authentication using a simple file (containing usernames and passwords)? I already found a similar question; however, no satisfying answers where given there.

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• How can I edit local security policy from a batch file?

  - by Stephen Jennings

  I am trying to write a utility as a batch file that, among other things, adds a user to the "Deny logon locally" local security policy. This batch file will be used on hundreds of independent computers (not on a domain and aren't even on the same network). I assumed one of the following were my options, but perhaps there's one I haven't thought of. A command line utility similar to net.exe which can modify local security policy. A VBScript sample to do the same. Write my own using some WMI or Win32 calls. I'd rather not do this one if I don't have to.

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• Linux laptop encryption

  - by kaerast

  What are my options for encrypting the /home directories of my Ubuntu laptops? They are currently setup without any encryption and some have /home as a separate partition whilst others don't. Most of these laptops are single-user standalone laptops which are out on the road a lot. Is ecryptfs and the encrypted Private directory good enough or are there better, more secure, options? If somebody got hold of the laptop, how easy would it be for them to gain access to the encrypted files? Similar questions for encrypted lvm, truecrypt and any other solution I may not be aware of.

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• Webserver: chrooted PHP gives mysql.sock error when attempting to reach mysql

  - by Jon L.

  Hey guys, I've configured an Ubuntu webserver with Nginx + PHP5-FPM. I've created a chrooted environment (using jailkit) that I'm tossing my developers into, from where they can develop their test applications. Chroot jail: /home/jail Nginx and PHP5-FPM run outside the chroot, but are configured to function with websites within the chrooted environment. So far, Nginx and PHP5-FPM are serving up files without issue, except for the following: When attempting to connect to MySQL, we receive this error: SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' Now, I believe the issue is due to the non-chrooted php.ini referencing mysqld.sock outside of the chroot environment (it's actually using the MySQL default setting currently). My question is, how can I configure PHP to access MySQL via loopback or similar? (Found that as a suggestion in a google result, but without any instructions) Or if I'm missing some other obvious setting, let me know. If there's an option of creating a hardlink (that would remain available even if mysql is restarted), that would be handy as well.

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• Diagnosing xmodmap errors

  - by intuited

  I'm getting this error when trying to use xmodmap to get rid of caps lock: $ xmodmap -e 'clear Lock' X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 118 (X_SetModifierMapping) Value in failed request: 0x17 Serial number of failed request: 8 Current serial number in output stream: 8 I'm running xfce on Maverick "10.10" Meercat. This problem did not occur before I added the Keyboard Layouts applet to a panel; before doing that, I was able to run my xmodmap script to swap Esc and CapsLock: !Remap Caps_Lock as Escape remove Lock = Caps_Lock keysym Caps_Lock = Escape It may be relevant that I chose alt-capslock as the keyboard switch combo in the Keyboard Layouts preferences. I've had a similar problem before, on a different machine, running openbox. On that machine, this problem started when I upgraded to Lucid, and has persisted in Maverick (release 10.10). I reported a bug in xorg. However, it remains unclear whether it's really a problem with xorg, or if I'm just doing something wrong with my configuration. Have other people experienced this problem? Can someone shed some light on what's going on here? It seems there are quite a few layers involved, and I don't understand any of them particularly well, so any information would be helpful. update I've discovered that the problem is specifically triggered by adding the Canada layout variant "Multilingual" (ca-multix). If I instead add the variant "Multilingual (first part)", the problem does not occur. I think this will probably end up being a usable workaround, but I don't yet know what the difference between these variants is. I've filed a freedesktop issue, and am commenting on a related ubuntu issue.

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• pip install fails on guest Linux Mint 15

  - by synergetic

  On my Windows 7 PC, I installed VMware VM for Linux Mint 15. Windows PC is behind corporate firewall /proxy server. Now inside Linux I issued: sudo apt-get install python-virtualenv Then created ~/projects folder and python virtual environment: mkdir projects cd projects virtualenv venv Then activated my virtual env: . venv/bin/activate So far no problem. Then tried to install python libraries, for example markupsafe: pip install markupsafe It throws an error: Cannot fetch index base URL https://pypi.python.org/simple/ Could not find any downloads that satisfy the requirement markupsafe No distributions at all found for markupsafe Storing complete log in /home/me/.pip/pip.log Inside pip.log I found: <urlopen error [Errno 104] Connection reset by peer> Installing any other library throws similar error. What's wrong here?

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• Schedule Task run Without Being Logged in

  - by Webs

  I have seen similar threads here and on the net, but I think my question is slightly different than what I can find... I have a script that runs perfectly when logged in with a service account I created specifically to run this script. But when I schedule it to run it hangs when trying to launch IE (the first part of my script). Without being logged in with that account I can watch the processes with task manager and see the processes running, but the script never finishes. I want to be able to run this script without needing to be logged in at all or even have the account be locked all the times. Is this possible? Or do I have to have the user account logged in? Any help would be greatly appreciated!

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• xcopy file, suppress &ldquo;Does xxx specify a file name&hellip;&rdquo; message

  - by MarkPearl

  Today we had an interesting problem with file copying. We wanted to use xcopy to copy a file from one location to another and rename the copied file but do this impersonating another user. Getting the impersonation to work was fairly simple, however we then had the challenge of getting xcopy to work. The problem was that xcopy kept prompting us with a prompt similar to the following… Does file.xxx specify a file name or directory name on the target (F = file, D = directory)? At which point we needed to press ‘Y’. This seems to be a fairly common challenge with xcopy, as illustrated by the following stack overflow link… One of the solutions was to do the following… echo f | xcopy /f /y srcfile destfile This is fine if you are running from the command prompt, but if you are triggering this from c# how could we daisy chain a bunch of commands…. The solution was fairly simple, we eventually ended up with the following method… public void Copy(string initialFile, string targetFile) { string xcopyExe = @"C:\windows\system32\xcopy.exe"; string cmdExe = @"C:\windows\system32\cmd.exe"; ProcessStartInfo p = new ProcessStartInfo(); p.FileName = cmdExe; p.Arguments = string.Format(@"/c echo f | {2} {0} {1} /Y", initialFile, targetFile, xcopyExe); Process.Start(p); } Where we wrapped the commands we wanted to chain as arguments and instead of calling xcopy directly, we called cmd.exe passing xcopy as an argument.

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• SEO Implications of creating Niche Product Blogs vs Main Company Blog with Categories.

  - by Frank

  Our company has a dilemma that I am hoping the users of Pro WebMasters can help us with. Right now as it stands we create a seperate website for each product that we sell. We also have our corporate site which lists each of these brands. For Example: www.Apple.com < --- main company site www.Ipad.com <--- Product www.Iphone.com <--- Product www.Imac.com <-- Product We are looking to build a wordpress blog mainly for the purpose of increasing our SEO rank. Here are our two options: SINGLE BLOG - On Our Corporate Domain http://apple.com/blog Each post is categoried http://apple.com/category/ipad/ipad-5-realeasd.htm Easier to manage than multiple blogs More content since its listing about all our products. ONE BLOG PER PRODUCT - on each site http://ipad.com/blog Each product has its own blog with only its own articles Harder to manage, but does it benefit SEO? Can the team here tell me the SEO benefits of either approach? Similar to Apple all the products our company sells are loosely related. Although its not likely that a customer of product A would be interested in product B.

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• Pygame Tile Based Character movement speed

  - by Ryan

  Thanks for taking the time to read this. Right now I'm making a really basic tile based game. The map is a large amount of 16x16 tiles, and the character image is 16x16 as well. My character has its own class that is an extension of the sprite class, and the x and y position is saved in terms of the tile position. To note I am fairly new to pygame. My question is, I am planning to have character movement restricted to one tile at a time, and I'm not sure how to make it so that, even if the player hits the directional key dozens of time quickly, (WASD or arrow keys) it will only move from tile to tile at a certain speed. How could I implement this generally with pygame? (Similar to game movement of like Pokemon or NexusTk). Edit: I should probably note that I want it so that the player can only end a movement in a tile. He couldn't stop moving halfway inbetween a tile for example. Thanks for your time! Ryan

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• Squid 3 reloading makes it stop serving requests

  - by coredump

  So, we use Squid 3 here (3.0.STABLE8-3+lenny4), pretty standard configuration (no dansguardian or similar) + NTLM authentication with LDAP background, circa 1000 users on a busy day, and our acls reference some external files (allowed/blocked sites/ip addresses). On Squid 2.X we used to be capable of reloading it's configuration (to add or sites or addresses to rules, etc) and squid would not stop serving during the reload. Since we changed to 3.0, that seems to be impossible: everytime we use reload (or -k reconfigure) it stop serving requests for as long as 2 minutes, and clients receive a Configured proxy is not accepting connections message. I checked the documentation and got nothing about it, does anyone else suffer from this problem or is it a isolated case on my setup? Also, if you have Squid 3.0 and doesn't suffer from this problem, how is your squid configured?

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• Cross-Platform Mobile Development With Mono for Android and MonoTouch

  - by Wallym

  Many years ago, in fact pre-Java, I remember a hallway discussion about the desire to write a single application that could easily run across various platforms. At the time, we were only worried about writing applications on Windows 3.1 and Mac OS 7.x. There were many discussions about windows, user interface concepts, and specifically a rather long discussion as to whether Mac users would accept a Mac application that didn't have balloon help. Thankfully, the marketplace answered this question for us with the Windows API winning the battle.A similar set of questions is currently going on in the mobile world. Unfortunately, at this point in time, there is currently no winning API and none currently in sight. What's a developer to do? Here are some questions that developers have (and there are many more):How can mobile developers target Android and the iPhone with the same code?How can .NET developers share their code across Android, iPhone and other platforms?How can developers give applications the look and feel of the specific platform and still allow as much code as possible to be shared?Mobile devices share many common features, such as cameras, accelerometers, and address books. How can we take advantage of them in a platform independent way and still give the users the look of every other application running on their platform?In this article, we'll look at some solutions to these cross-platform and code-sharing questions between Mono for Android, MonoTouch and the .NET Framework available to developers. 

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• [MINI HOW-TO] Remove a Network Computer from Windows Home Server

  - by Mysticgeek

  One of the cool features of Windows Home Server is the ability to backup and monitor the computers on your network. If you no longer need a machine on to be monitored or backed up, here we show you how to remove it. Remove Computer from WHS The process if straight-forward and basic –Open Windows Home Server Console and click on Computers & Backup. Right-click on the computer that you no longer need and click Remove. You’ll be prompted to verify that you want to remove the machine and delete all of its backup data. Check the box I am sure I want to remove this computer then click the Remove button. That’s all there is to it! The computer and all of its backup data is removed. Remember that if you remove a computer, all of its backup data will be deleted as well. If you no longer have the computer, you probably don’t need the backed up data anyway, but you’ll want to be sure you no longer need it before removing it. Similar Articles Productive Geek Tips GMedia Blog: Setting Up a Windows Home ServerRestore Files from Backups on Windows Home ServerCreate A Windows Home Server Home Computer Restore DiscInstalling Windows Home ServerChange Ubuntu Server from DHCP to a Static IP Address TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 PCmover Professional Beware Hover Kitties Test Drive Mobile Phones Online With TryPhone Ben & Jerry’s Free Cone Day, 3/23/10 New Stinger from McAfee Helps Remove ‘FakeAlert’ Threats Google Apps Marketplace: Tools & Services For Google Apps Users Get News Quick and Precise With Newser

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• DNS: forward part of a managed domain to one host, but sub domain services to another (Google Apps)

  - by Paul Zee

  I was going to post this as a comment against DNS: Forward domain to another host, but I don't seem able to do that. I'm in a similar situation. I have a DNS registered/managed by enom, except with the slight twist that the domain was originally registered with enom through a Google Apps account creation. The domain currently supports a Google Apps site/account. I now want to direct the bare primary domain and www entries to a hosting provider for the website component, but leave the Google Apps setup intact for its services such as calendar, mail etc. For now, I'm leaving the domain managed by enom. Also note that when I registered my account with the hosting provider, I gave the same domain name as the existing domain (e.g. example.com), so at their end I'm working with the same domain name in cpanel, etc. In my case, the existing enom DNS entries don't have an A record for the www.example.com, or the bare example.com domain. Instead, there are 4 x @ records with the Google Apps IP Address, 2 x TXT records with what I assume are Google Apps site verification strings/tokens, and a bunch of CNAME records for the various features of Google Apps (mail, calendar, docs, sites, etc). So, my questions: How do I point the www.example.com and example.com DNS entries at enom to my web site hosting provider, while leaving the domain managed by enom, and the Google Apps services working as they are now (with the obvious exception of Google Sites)? How do I setup the example.com mail-related DNS records (MX, etc) at the web site hosting provider, so that outbound email to [email protected] gets correctly sent to the google apps mail account, and doesn't get trapped inside the pseudo domain within the hosting providers servers?

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• Why does XFBML work everywhere but in Chrome?

  - by Andrei

  I try to add simple Like button to my Facebook Canvas app (iframe). The button (and all other XFBML elements) works in Safari, Firefox, Opera, but in Google Chrome. How can I find the problem? EDIT1: This is ERB-layout in my Rails app <html xmlns:fb='http://www.facebook.com/2008/fbml' xmlns='http://www.w3.org/1999/xhtml'> ... <body> ... <div id="fb-root"></div> <script> window.fbAsyncInit = function() { FB.init({ appId: '<%= @app_id %>', status: true, cookie: true, xfbml: true }); FB.XFBML.parse(); }; (function() { var e = document.createElement('script'); e.async = true; e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js#appId=<%=@app_id%>&amp;amp;xfbml=1'; document.getElementById('fb-root').appendChild(e); }()); FB.XFBML.parse(); </script> <fb:like></fb:like> ... JS error message in Chrome inspector: Uncaught ReferenceError: FB is not defined (anonymous function) Uncaught TypeError: Cannot call method 'appendChild' of null window (anonymous function) Probably similar to http://forum.developers.facebook.net/viewtopic.php?id=84684

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• WebCenter Spaces 11g PS2 Task Flow Customization

  - by Javier Ductor

  Previously, I wrote about Spaces Template Customization. In order to adapt Spaces to customers prototype, it was necessary to change template and skin, as well as the members task flow. In this entry, I describe how to customize this task flow.Default members portlet:Prototype Members Portlet:First thing to do, I downloaded SpacesTaskflowCustomizationApplication with its guide.This application allows developers to modify task flows in Spaces, such as Announcements, Discussions, Events, Members, etc. Before starting, some configuration is needed in jDeveloper, like changing role to 'Customization Developer' mode, although it is explained in the application guide. It is important to know that the way task flows are modified is through libraries, and they cannot be updated directly in the source code like templates, you must use the Structure panel for this. Steps to customize Members portlet:1. There are two members views: showIconicView and showListView. By default it is set to Iconic view, but in my case I preferred the View list, so I updated in table-of-members-taskflow.xml this default value.2. Change the TableOfMembers-ListView.jspx file. By editing this file, you can control the way this task flow is displayed. So I customized this list view using the structure panel to get the desired look&feel.3. After changes are made, click save all, because every time a library changes an xml file is generated with all modifications listed, and they must be saved.4. Rebuild project and deploy application.5. Open WLST command window and import this customization to MDS repository with the 'import' command.Eventually, this was the result:Other task flows can be customized in a similar way.

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• SQL SERVER – Weekly Series – Memory Lane – #039

  - by Pinal Dave

  Here is the list of selected articles of SQLAuthority.com across all these years. Instead of just listing all the articles I have selected a few of my most favorite articles and have listed them here with additional notes below it. Let me know which one of the following is your favorite article from memory lane. 2007 FQL – Facebook Query Language Facebook list following advantages of FQL: Condensed XML reduces bandwidth and parsing costs. More complex requests can reduce the number of requests necessary. Provides a single consistent, unified interface for all of your data. It’s fun! UDF – Get the Day of the Week Function The day of the week can be retrieved in SQL Server by using the DatePart function. The value returned by the function is between 1 (Sunday) and 7 (Saturday). To convert this to a string representing the day of the week, use a CASE statement. UDF – Function to Get Previous And Next Work Day – Exclude Saturday and Sunday While reading ColdFusion blog of Ben Nadel Getting the Previous Day In ColdFusion, Excluding Saturday And Sunday, I realize that I use similar function on my SQL Server Database. This function excludes the Weekends (Saturday and Sunday), and it gets previous as well as next work day. Complete Series of SQL Server Interview Questions and Answers Data Warehousing Interview Questions and Answers – Introduction Data Warehousing Interview Questions and Answers – Part 1 Data Warehousing Interview Questions and Answers – Part 2 Data Warehousing Interview Questions and Answers – Part 3 Data Warehousing Interview Questions and Answers Complete List Download 2008 Introduction to Log Viewer In SQL Server all the windows event logs can be seen along with SQL Server logs. Interface for all the logs is same and can be launched from the same place. This log can be exported and filtered as well. DBCC SHRINKFILE Takes Long Time to Run If you are DBA who are involved with Database Maintenance and file group maintenance, you must have experience that many times DBCC SHRINKFILE operations takes a long time but any other operations with Database are relatively quicker. mssqlsystemresource – Resource Database The purpose of resource database is to facilitates upgrading to the new version of SQL Server without any hassle. In previous versions whenever version of SQL Server was upgraded all the previous version system objects needs to be dropped and new version system objects to be created. 2009 Puzzle – Write Script to Generate Primary Key and Foreign Key In SQL Server Management Studio (SSMS), there is no option to script all the keys. If one is required to script keys they will have to manually script each key one at a time. If database has many tables, generating one key at a time can be a very intricate task. I want to throw a question to all of you if any of you have scripts for the same purpose. Maximizing View of SQL Server Management Studio – Full Screen – New Screen I had explained the following two different methods: 1) Open Results in Separate Tab - This is a very interesting method as result pan shows up in a different tab instead of the splitting screen horizontally. 2) Open SSMS in Full Screen - This works always and to its best. Not many people are aware of this method; hence, very few people use it to enhance performance. 2010 Find Queries using Parallelism from Cached Plan T-SQL script gets all the queries and their execution plan where parallelism operations are kicked up. Pay attention there is TOP 10 is used, if you have lots of transactional operations, I suggest that you change TOP 10 to TOP 50 This is the list of the all the articles in the series of computed columns. SQL SERVER – Computed Column – PERSISTED and Storage This article talks about how computed columns are created and why they take more storage space than before. SQL SERVER – Computed Column – PERSISTED and Performance This article talks about how PERSISTED columns give better performance than non-persisted columns. SQL SERVER – Computed Column – PERSISTED and Performance – Part 2 This article talks about how non-persisted columns give better performance than PERSISTED columns. SQL SERVER – Computed Column and Performance – Part 3 This article talks about how Index improves the performance of Computed Columns. SQL SERVER – Computed Column – PERSISTED and Storage – Part 2 This article talks about how creating index on computed column does not grow the row length of table. SQL SERVER – Computed Columns – Index and Performance This article summarized all the articles related to computed columns. 2011 SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Data Warehousing Concepts – Day 21 of 31 What is Data Warehousing? What is Business Intelligence (BI)? What is a Dimension Table? What is Dimensional Modeling? What is a Fact Table? What are the Fundamental Stages of Data Warehousing? What are the Different Methods of Loading Dimension tables? Describes the Foreign Key Columns in Fact Table and Dimension Table? What is Data Mining? What is the Difference between a View and a Materialized View? SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Data Warehousing Concepts – Day 22 of 31 What is OLTP? What is OLAP? What is the Difference between OLTP and OLAP? What is ODS? What is ER Diagram? SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Data Warehousing Concepts – Day 23 of 31 What is ETL? What is VLDB? Is OLTP Database is Design Optimal for Data Warehouse? If denormalizing improves Data Warehouse Processes, then why is the Fact Table is in the Normal Form? What are Lookup Tables? What are Aggregate Tables? What is Real-Time Data-Warehousing? What are Conformed Dimensions? What is a Conformed Fact? How do you Load the Time Dimension? What is a Level of Granularity of a Fact Table? What are Non-Additive Facts? What is a Factless Facts Table? What are Slowly Changing Dimensions (SCD)? SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Data Warehousing Concepts – Day 24 of 31 What is Hybrid Slowly Changing Dimension? What is BUS Schema? What is a Star Schema? What Snow Flake Schema? Differences between the Star and Snowflake Schema? What is Difference between ER Modeling and Dimensional Modeling? What is Degenerate Dimension Table? Why is Data Modeling Important? What is a Surrogate Key? What is Junk Dimension? What is a Data Mart? What is the Difference between OLAP and Data Warehouse? What is a Cube and Linked Cube with Reference to Data Warehouse? What is Snapshot with Reference to Data Warehouse? What is Active Data Warehousing? What is the Difference between Data Warehousing and Business Intelligence? What is MDS? Explain the Paradigm of Bill Inmon and Ralph Kimball. SQL SERVER – Azure Interview Questions and Answers – Guest Post by Paras Doshi – Day 25 of 31 Paras Doshi has submitted 21 interesting question and answers for SQL Azure. 1.What is SQL Azure? 2.What is cloud computing? 3.How is SQL Azure different than SQL server? 4.How many replicas are maintained for each SQL Azure database? 5.How can we migrate from SQL server to SQL Azure? 6.Which tools are available to manage SQL Azure databases and servers? 7.Tell me something about security and SQL Azure. 8.What is SQL Azure Firewall? 9.What is the difference between web edition and business edition? 10.How do we synchronize On Premise SQL server with SQL Azure? 11.How do we Backup SQL Azure Data? 12.What is the current pricing model of SQL Azure? 13.What is the current limitation of the size of SQL Azure DB? 14.How do you handle datasets larger than 50 GB? 15.What happens when the SQL Azure database reaches Max Size? 16.How many databases can we create in a single server? 17.How many servers can we create in a single subscription? 18.How do you improve the performance of a SQL Azure Database? 19.What is code near application topology? 20.What were the latest updates to SQL Azure service? 21.When does a workload on SQL Azure get throttled? SQL SERVER – Interview Questions and Answers – Guest Post by Malathi Mahadevan – Day 26 of 31 Malachi had asked a simple question which has several answers. Each answer makes you think and ponder about the reality of the IT world. Look at the simple question – ‘What is the toughest challenge you have faced in your present job and how did you handle it’? and its various answers. Each answer has its own story. SQL SERVER – Interview Questions and Answers – Guest Post by Rick Morelan – Day 27 of 31 Rick Morelan of Joes2Pros has written an excellent blog post on the subject how to find top N values. Most people are fully aware of how the TOP keyword works with a SELECT statement. After years preparing so many students to pass the SQL Certification I noticed they were pretty well prepared for job interviews too. Yes, they would do well in the interview but not great. There seemed to be a few questions that would come up repeatedly for almost everyone. Rick addresses similar questions in his lucid writing skills. 2012 Observation of Top with Index and Order of Resultset SQL Server has lots of things to learn and share. It is amazing to see how people evaluate and understand different techniques and styles differently when implementing. The real reason may be absolutely different but we may blame something totally different for the incorrect results. Read the blog post to learn more. How do I Record Video and Webcast How to Convert Hex to Decimal or INT Earlier I asked regarding a question about how to convert Hex to Decimal. I promised that I will post an answer with Due Credit to the author but never got around to post a blog post around it. Read the original post over here SQL SERVER – Question – How to Convert Hex to Decimal. Query to Get Unique Distinct Data Based on Condition – Eliminate Duplicate Data from Resultset The natural reaction will be to suggest DISTINCT or GROUP BY. However, not all the questions can be solved by DISTINCT or GROUP BY. Let us see the following example, where a user wanted only latest records to be displayed. Let us see the example to understand further. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Memory Lane, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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• Evil DRY

  - by StefanSteinegger

  DRY (Don't Repeat Yourself) is a basic software design and coding principle. But there is just no silver bullet. While DRY should increase maintainability by avoiding common design mistakes, it could lead to huge maintenance problems when misunderstood. The root of the problem is most probably that many developers believe that DRY means that any piece of code that is written more then once should be made reusable. But the principle is stated as "Every piece of knowledge must have a single, unambiguous, authoritative representation within a system." So the important thing here is "knowledge". Nobody ever said "every piece of code". I try to give some examples of misusing the DRY principle. Code Repetitions by Coincidence There is code that is repeated by pure coincidence. It is not the same code because it is based on the same piece of knowledge, it is just the same by coincidence. It's hard to give an example of such a case. Just think about some lines of code the developer thinks "I already wrote something similar". Then he takes the original code, puts it into a public method, even worse into a base class where none had been there before, puts some weird arguments and some if or switch statements into it to support all special cases and calls this "increasing maintainability based on the DRY principle". The resulting "reusable method" is usually something the developer not even can give a meaningful name, because its contents isn't anything specific, it is just a bunch of code. For the same reason, nobody will really understand this piece of code. Typically this method only makes sense to call after some other method had been called. All the symptoms of really bad design is evident. Fact is, writing this kind of "reusable methods" is worse then copy pasting! Believe me. What will happen when you change this weird piece of code? You can't say what'll happen, because you can't understand what the code is actually doing. So better don't touch it anymore. Maintainability just died. Of course this problem is with any badly designed code. But because the developer tried to make this method as reusable as possible, large parts of the system get dependent on it. Completely independent parts get tightly coupled by this common piece of code. Changing on the single common place will have effects anywhere in the system, a typical symptom of too tight coupling. Without trying to dogmatically (and wrongly) apply the DRY principle, you just had a system with a weak design. Now you get a system which just can't be maintained anymore. So what can you do against it? When making code reusable, always identify the generally reusable parts of it. Find the reason why the code is repeated, find the common "piece of knowledge". If you have to search too far, it's probably not really there. Explain it to a colleague, if you can't explain or the explanation is to complicated, it's probably not worth to reuse. If you identify the piece of knowledge, don't forget to carefully find the place where it should be implemented. Reusing code is never worth giving up a clean design. Methods always need to do something specific. If you can't give it a simple and explanatory name, you did probably something weird. If you can't find the common piece of knowledge, try to make the code simpler. For instance, if you have some complicated string or collection operations within this code, write some general-purpose operations into a helper class. If your code gets simple enough, its not so bad if it can't be reused. If you are not able to find anything simple and reasonable, copy paste it. Put a comment into the code to reference the other copies. You may find a solution later. Requirements Repetitions by Coincidence Let's assume that you need to implement complex tax calculations for many countries. It's possible that some countries have very similar tax rules. These rules are still completely independent from each other, since every country can change it of its own. (Assumed that this similarity is actually by coincidence and not by political membership. There might be basic rules applying to all European countries. etc.) Let's assume that there are similarities between an Asian country and an African country. Moving the common part to a central place will cause problems. What happens if one of the countries changes its rules? Or - more likely - what happens if users of one country complain about an error in the calculation? If there is shared code, it is very risky to change it, even for a bugfix. It is hard to find requirements to be repeated by coincidence. Then there is not much you can do against the repetition of the code. What you really should consider is to make coding of the rules as simple as possible. So this independent knowledge "Tax Rules in Timbuktu" or wherever should be as pure as possible, without much overhead and stuff that does not belong to it. So you can write every independent requirement short and clean. DRYing try-catch and using Blocks This is a technical issue. Blocks like try-catch or using (e.g. in C#) are very hard to DRY. Imagine a complex exception handling, including several catch blocks. When the contents of the try block as well as the contents of the individual catch block are trivial, but the whole structure is repeated on many places in the code, there is almost no reasonable way to DRY it. try { // trivial code here using (Thingy thing = new thingy) { //trivial, but always different line of code } } catch(FooException foo) { // trivial foo handling } catch (BarException bar) { // trivial bar handling } catch { // trivial common handling } finally { // trivial finally block } The key here is that every block is trivial, so there is nothing to just move into a separate method. The only part that differs from case to case is the line of code in the body of the using block (or any other block). The situation is especially interesting if the many occurrences of this structure are completely independent: they appear in classes with no common base class, they don't aggregate each other and so on. Let's assume that this is a common pattern in service methods within the whole system. Examples of Evil DRYing in this situation: Put a if or switch statement into the method to choose the line of code to execute. There are several reasons why this is not a good idea: The close coupling of the formerly independent implementation is the strongest. Also the readability of the code and the use of a parameter to control the logic. Put everything into a method which takes a delegate as argument to call. The caller just passes his "specific line of code" to this method. The code will be very unreadable. The same maintainability problems apply as for any "Code Repetition by Coincidence" situations. Enforce a base class to all the classes where this pattern appears and use the template method pattern. It's the same readability and maintainability problem as above, but additionally complex and tightly coupled because of the base class. I would call this "Inheritance by Coincidence" which will not lead to great software design. What can you do against it: Ideally, the individual line of code is a call to a class or interface, which could be made individual by inheritance. If this would be the case, it wouldn't be a problem at all. I assume that it is no such a trivial case. Consider to refactor the error concept to make error handling easier. The last but not worst option is to keep the replications. Some pattern of code must be maintained in consistency, there is nothing we can do against it. And no reason to make it unreadable. Conclusion The DRY-principle is an important and basic principle every software developer should master. The key is to identify the "pieces of knowledge". There is code which can't be reused easily because of technical reasons. This requires quite a bit flexibility and creativity to make code simple and maintainable. It's not the problem of the principle, it is the problem of blindly applying a principle without understanding the problem it should solve. The result is mostly much worse then ignoring the principle.

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• Set mouse or keyboard button to simulate left click and hold or rapid left click repeating in Windows?

  - by miahelf

  Does anyone know a way to configure Windows 7 or use third party software to do this? I would like to click my middle mouse button and have it tell Windows to left click and hold until I click the middle mouse button again. A keyboard key would be fine as well. Some games and apps have me holding down the left mouse button for a long time and I would like to reduce the stress on my mouse hand. Also, I would like to do a similar thing but have it repeatedly click the left mouse button automatically if possible. If none of that is possible, how about temporalily setting a keyboard key to achieve a left mouse button emulation?

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• What is the best strategy for transforming unicode strings into filenames?

  - by David Cowden

  I have a bunch (thousands) of resources in an RDF/XML file. I am writing a certain subset of the resources to files -- one file for each, and I'm using the resource's title property as the file name. However, the titles are every day article, website, and blog post titles, so they contain characters unsafe for a URI (the necessary step for constructing a valid file path). I know of the Jersey UriBuilder but I can't quite get it to work for my needs as I detailed in a different question on SO. Some possibilities I have considered are: Since each resource should also have an associated URL, I could try to use the name of the file on the server. The down side of this is sometimes people don't name their content logically and I think the title of an article better reflects the content that will be in each text file. Construct a white list of valid characters and parse the string myself defining substitutions for unsafe characters. The downside of this is the result could be just as unreadable as the former solution because presumably the content creators went through a similar process when placing the files on their server. Choose a more generic naming scheme, place the title in the text file along with the other attributes, and tell my boss to live with it. So my question here is, what methods work well for dealing with a scenario where you need to construct file names out of strings with potentially unsafe characters? Is there a solution that better fills out my constraints?

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