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  • json problems with making a ruby on rails application

    - by Prince Merdz
    So I'm using Bitnami to learn Ruby on Rails. I have also previously tried the manual installation for ruby and rails and was met by the same problem so I thought I should try first the easy package deal of Bitnami. Anyway my problem with json is that it causes the bundle install to fail. First the auto bundle install that rails new does fails because of an ssl error. Which is easily solved by changing the source in the gemfile which is https to http. However when I try to bundle install it does another error when it tries to install json. C:\RubyStack-3.2.7-0\projects\testing>bundle install Fetching gem metadata from http://rubygems.org/......... Using rake (0.9.2.2) Using i18n (0.6.0) Using multi_json (1.3.6) Installing activesupport (3.2.8) Using builder (3.0.0) Installing activemodel (3.2.8) Using erubis (2.7.0) Using journey (1.0.4) Using rack (1.4.1) Using rack-cache (1.2) Using rack-test (0.6.1) Using hike (1.2.1) Using tilt (1.3.3) Using sprockets (2.1.3) Installing actionpack (3.2.8) Using mime-types (1.19) Using polyglot (0.3.3) Using treetop (1.4.10) Using mail (2.4.4) Installing actionmailer (3.2.8) Using arel (3.0.2) Using tzinfo (0.3.33) Installing activerecord (3.2.8) Installing activeresource (3.2.8) Using bundler (1.1.5) Using coffee-script-source (1.3.3) Using execjs (1.4.0) Using coffee-script (2.2.0) Using rack-ssl (1.3.2) Installing json (1.7.5) with native extensions Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension . C:/RUBYST~1.7-0/ruby/bin/ruby.exe extconf.rb creating Makefile make 0 [main] echo 5244 open_stackdumpfile: Dumping stack trace to echo.exe.sta ckdump make: *** [generator-i386-mingw32.def] Error 5 Gem files will remain installed in C:/RUBYST~1.7-0/ruby/lib/ruby/gems/1.9.1/gems /json-1.7.5 for inspection. Results logged to C:/RUBYST~1.7-0/ruby/lib/ruby/gems/1.9.1/gems/json-1.7.5/ext/j son/ext/generator/gem_make.out An error occured while installing json (1.7.5), and Bundler cannot continue. Make sure that `gem install json -v '1.7.5'` succeeds before bundling. This is the gem_make.out file it produces after trying to install json (btw windows also produces an error that echo.exe has stopped working while running the gem install json) C:/RUBYST~1.7-0/ruby/bin/ruby.exe extconf.rb creating Makefile make 0 [main] echo 5244 open_stackdumpfile: Dumping stack trace to echo.exe.stackdump make: *** [generator-i386-mingw32.def] Error 5 I can't even start learning ror for the setup is already a huge pain. (btw I have no prior experience with web frameworks, just desktop programming). help?

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  • How to start / stop internet sharing using apple script

    - by jon
    i dont have a wifi router, so when at home i need to turn my laptop into a wifi source so that both myself and my partner can access the internet. however during the days i work at a coffee shop and require the use of their wifi. i'm running snow leopard and i find it stupidly cumbersome to constantly be turning off and on, first internet sharing and then my wifi. any ideas for a quick n dirty applescript solution? thanks a bajillion! Jon

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  • java progress bar while applet loads

    - by Dan
    OK so, let's say I have a Java applet that takes a while to load (~5 secs). It's getting the mysql-connector.jar and it's loading. Well.. instead of the gray box with the coffee logo... can I make it have a simple progress bar with the percent? Thanks.

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  • Increasing your efficiency during programming

    - by Tom
    Yeah, yeah, I know, it is a little bit of offtopic, but let's try. So, I want to increase my efficiency during my programming as much as possible to programme as fast and sensibly as possiblle. What do you do before starting coding? Drink a lot of coffee, energy drinks? Do you listen to music during programming or you keep quite? Share your ideas.

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  • Wallet Underflow? [closed]

    - by David T. McKee
    I am a software engineer who would love to "disconnect" from the "company store" so-to-speak. This concept of Stack-Overflow is great...so, because I know that software engineers need coffee and food, how do you monetize this? Just wondering.

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  • why the output of ls is like this

    - by dorelal
    I am using snow leopard and this is what I get in my terminal. By default I am using bash. > ls c* clock: PSD demo.html jquery.tzineClock script.js styles.css clock2: clojure-presentations: Clojure-1up.pdf ClojureInTheField-1up.pdf license.html Clojure-4up.pdf README ClojureForRubyists-1up.pdf keynote coffee-script: Cakefile README bin examples index.html package.json test LICENSE Rakefile documentation extras lib src vendor

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  • what do you do while code is compiling

    - by Jacob
    I'm looking for the best idea for what to do while code is compiling or tests are running. Typically around 5 minutes of thumb twiddling. Only so many cups of coffee can be made and drunk in a day, and I don't want to be seen always in the kitchen or bothering other people.

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  • Progress bar while applet loads

    - by Dan
    OK so, let's say I have a Java applet that takes a while to load (~5 secs). It's getting the mysql-connector.jar and it's loading. Well.. instead of the gray box with the coffee logo... can I make it have a simple progress bar with the percent? Thanks.

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  • Rails in production environment not working,but it's working in development environment

    - by user1834759
    An ActionView::Template::Error occurred in posts#index: couldn't find file 'jquery' (in /opt/ruby_apps/bookdate-website/app/assets/javascripts/cpanel_app.coffee:1) sprockets (2.1.3) lib/sprockets/context.rb:100:in `resolve' An ActionView::Template::Error occurred in topics#show: cannot load such file -- html/tokenizer actionpack (3.2.8) lib/action_controller/vendor/html-scanner/html/sanitizer.rb:18:in `tokenize' sometimes there is an exception thrown like the one mentioned above,but sometime it works why? my ruby environment is ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux] Rails 3.2.8

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  • Movable Type: Specify only one keyword from MTEntryKeywords

    - by kohei
    Hi, I have several keywords (1~3 words) stored in <MTEntryKeywords> field separated by commas. I want to take out the first keyword from MTEntryKeywords. Example 1: In the Keywords field I have entered: gadgets,phone,apple, Want to display: gadgets Example 2: In the Keywords field I have entered: food,coffee,apple, Want to display: food Any ideas?

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  • Can CoffeeScript Be Translated into This Piece of JavaScript?

    - by tangrui
    function abc() { var a = 1; var func = function() { var a = 2; } func(); alert(a); } Pay attention to the var, in the piece of code, the result of a will be 1, but if the var is omitted, the result will be 2, but I found Coffee not able to translate to this. For example the following: abc = -> a = 1 func = -> a = 2 return func() alert(a) return

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  • NPM not installing dependencies?

    - by neezer
    Having trouble getting NPM to install dependencies with npm install -d in my project directory with a defined package.json file. Here's my package.json: https://gist.github.com/3068312 And after wiping my project root's node modules folder (rm -rf node_modules), I run npm install -d in my project root and am greeted with this: (ssh) /vagrant git:master ? npm install -d npm info it worked if it ends with ok npm info using [email protected] npm info using [email protected] npm info preinstall [email protected] npm http GET https://registry.npmjs.org/sinon npm http GET https://registry.npmjs.org/underscore npm http GET https://registry.npmjs.org/mocha npm http GET https://registry.npmjs.org/request npm http 304 https://registry.npmjs.org/sinon npm http 304 https://registry.npmjs.org/underscore npm http 304 https://registry.npmjs.org/mocha npm http 304 https://registry.npmjs.org/request npm info into /vagrant [email protected] npm info into /vagrant [email protected] npm info into /vagrant [email protected] npm info into /vagrant [email protected] npm info installOne [email protected] npm info installOne [email protected] npm info installOne [email protected] npm info installOne [email protected] npm info unbuild /vagrant/node_modules/underscore npm info unbuild /vagrant/node_modules/mocha npm info unbuild /vagrant/node_modules/sinon npm info unbuild /vagrant/node_modules/request npm ERR! error installing [email protected] npm info unbuild /vagrant/node_modules/underscore npm ERR! error rolling back [email protected] Error: UNKNOWN, unknown error '/vagrant/node_modules/underscore' npm ERR! Error: ENOENT, no such file or directory '/vagrant/node_modules/underscore/package.json' npm ERR! You may report this log at: npm ERR! <http://bugs.debian.org/npm> npm ERR! or use npm ERR! reportbug --attach /vagrant/npm-debug.log npm npm ERR! npm ERR! System Linux 3.2.0-23-generic npm ERR! command "node" "/usr/bin/npm" "install" "-d" npm ERR! cwd /vagrant npm ERR! node -v v0.6.12 npm ERR! npm -v 1.1.4 npm ERR! path /vagrant/node_modules/underscore/package.json npm ERR! code ENOENT npm ERR! message ENOENT, no such file or directory '/vagrant/node_modules/underscore/package.json' npm ERR! errno {} npm ERR! error installing [email protected] npm info unbuild /vagrant/node_modules/request npm ERR! error rolling back [email protected] Error: UNKNOWN, unknown error '/vagrant/node_modules/request' npm ERR! npm ERR! Additional logging details can be found in: npm ERR! /vagrant/npm-debug.log npm not ok If I rerun npm install -d, the error changes to whatever the next package is... if I keep running it it over and over again, it eventually doesn't complain anymore and outputs: (ssh) /vagrant git:master ? npm install -d npm info it worked if it ends with ok npm info using [email protected] npm info using [email protected] npm info preinstall [email protected] npm info build /vagrant npm info linkStuff [email protected] npm info install [email protected] npm info postinstall [email protected] npm info ok However, none of the dependencies for any of these packages get installed. For instance, cheerio has a few dependencies, so when I try running my test suite, I'm greeted with: (ssh) /vagrant git:master ? mocha --compilers coffee:coffee-script --watch spec/* node.js:201 throw e; // process.nextTick error, or 'error' event on first tick ^ Error: Cannot find module 'cheerio-select' at Function._resolveFilename (module.js:332:11) at Function._load (module.js:279:25) at Module.require (module.js:354:17) What gives? I'm on Ubuntu Precise64 in a Vagrant virtual box.

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  • Mauritius Software Craftsmanship Community

    There we go! I finally managed to push myself forward and pick up an old, actually too old, idea since I ever arrived here in Mauritius more than six years ago. I'm talking about a community for all kind of ICT connected people. In the past (back in Germany), I used to be involved in various community activities. For example, I was part of the Microsoft Community Leader/Influencer Program (CLIP) in Germany due to an FAQ on Visual FoxPro, actually Active FoxPro Pages (AFP) to be more precise. Then in 2003/2004 I addressed the responsible person of the dFPUG user group in Speyer in order to assist him in organising monthly user group meetings. Well, he handed over management completely, and attended our meetings regularly. Why did it take you so long? Well, I don't want to bother you with the details but short version is that I was too busy on either job (building up new companies) or private life (got married and we have two lovely children, eh 'monsters') or even both. But now is the time where I was starting to look for new fields given the fact that I gained some spare time. My businesses are up and running, the kids are in school, and I am finally in a position where I can commit myself again to community activities. And I love to do that! Why a new user group? Good question... And 'easy' to answer. Since back in 2007 I did my usual research, eh Google searches, to see whether there existing user groups in Mauritius and in which field of interest. And yes, there are! If I recall this correctly, then there are communities for PHP, Drupal, Python (just recently), Oracle, and Linux (which used to be even two). But... either they do not exist anymore, they are dormant, or there is only a low heart-beat, frankly speaking. And yes, I went to meetings of the Linux User Group Meta (Mauritius) back in 2010/2011 and just recently. I really like the setup and the way the LUGM is organised. It's just that I have a slightly different point of view on how a user group or community should organise itself and how to approach future members. Don't get me wrong, I'm not criticizing others doing a very good job, I'm only saying that I'd like to do it differently. The last meeting of the LUGM was awesome; read my feedback about it. Ok, so what's up with 'Mauritius Software Craftsmanship Community' or short: MSCC? As I've already written in my article on 'Communities - The importance of exchange and discussion' I think it is essential in a world of IT to stay 'connected' with a good number of other people in the same field. There is so much dynamic and every day's news that it is almost impossible to keep on track with all of them. The MSCC is going to provide a common platform to exchange experience and share knowledge between each other. You might be a newbie and want to know what to expect working as a software developer, or as a database administrator, or maybe as an IT systems administrator, or you're an experienced geek that loves to share your ideas or solutions that you implemented to solve a specific problem, or you're the business (or HR) guy that is looking for 'fresh' blood to enforce your existing team. Or... you're just interested and you'd like to communicate with like-minded people. Meetup of 26.06.2013 @ L'arabica: Of course there are laptops around. Free WiFi, power outlet, coffee, code and Linux in one go. The MSCC is technology-agnostic and spans an umbrella over any kind of technology. Simply because you can't ignore other technologies anymore in a connected IT world as we have. A front-end developer for iOS applications should have the chance to connect with a Python back-end coder and eventually with a DBA for MySQL or PostgreSQL and exchange their experience. Furthermore, I'm a huge fan of cross-platform development, and it is very pleasant to have pure Web developers - with all that HTML5, CSS3, JavaScript and JS libraries stuff - and passionate C# or Java coders at the same table. This diversity of knowledge can assist and boost your personal situation. And last but not least, there are projects and open positions 'flying' around... People might like to hear others opinion about an employer or get new impulses on how to tackle down an issue at their workspace, etc. This is about community. And that's how I see the MSCC in general - free of any limitations be it by programming language or technology. Having the chance to exchange experience and to discuss certain aspects of technology saves you time and money, and it's a pleasure to enjoy. Compared to dusty books and remote online resources. It's human! Organising meetups (meetings, get-together, gatherings - you name it!) As of writing this article, the MSCC is currently meeting every Wednesday for the weekly 'Code & Coffee' session at various locations (suggestions are welcome!) in Mauritius. This might change in the future eventually but especially at the beginning I think it is very important to create awareness in the Mauritian IT world. Yes, we are here! Come and join us! ;-) The MSCC's main online presence is located at Meetup.com because it allows me to handle the organisation of events and meeting appointments very easily, and any member can have a look who else is involved so that an exchange of contacts is given at any time. In combination with the other entities (G+ Communities, FB Pages or in Groups) I advertise and manage all future activities here: Mauritius Software Craftsmanship Community This is a community for those who care and are proud of what they do. For those developers, regardless how experienced they are, who want to improve and master their craft. This is a community for those who believe that being average is just not good enough. I know, there are not many 'craftsmen' yet but it's a start... Let's see how it looks like by the end of the year. There are free smartphone apps for Android and iOS from Meetup.com that allow you to keep track of meetings and to stay informed on latest updates. And last but not least, there is a Trello workspace to collect and share ideas and provide downloads of slides, etc. Trello is also available as free smartphone app. Sharing is caring! As mentioned, the #MSCC is present in various social media networks in order to cover as many people as possible here in Mauritius. Following is an overview of the current networks: Twitter - Latest updates and quickies Google+ - Community channel Facebook - Community Page LinkedIn - Community Group Trello - Collaboration workspace to share and develop ideas Hopefully, this covers the majority of computer-related people in Mauritius. Please spread the word about the #MSCC between your colleagues, your friends and other interested 'geeks'. Your future looks bright Running and participating in a user group or any kind of community usually provides quite a number of advantages for anyone. On the one side it is very joyful for me to organise appointments and get in touch with people that might be interested to present a little demo of their projects or their recent problems they had to tackle down, and on the other side there are lots of companies that have various support programs or sponsorships especially tailored for user groups. At the moment, I already have a couple of gimmicks that I would like to hand out in small contests or raffles during one of the upcoming meetings, and as said, companies provide all kind of goodies, books free of charge, or sometimes even licenses for communities. Meeting other software developers or IT guys also opens up your point of view on the local market and there might be interesting projects or job offers available, too. A community like the Mauritius Software Craftsmanship Community is great for freelancers, self-employed, students and of course employees. Meetings will be organised on a regular basis, and I'm open to all kind of suggestions from you. Please leave a comment here in blog or join the conversations in the above mentioned social networks. Let's get this community up and running, my fellow Mauritians! Recent updates The MSCC is now officially participating in the O'Reilly UK User Group programm and we are allowed to request review or recension copies of recent titles. Additionally, we have a discount code for any books or ebooks that you might like to order on shop.oreilly.com. More applications for user group sponsorship programms are pending and I'm looking forward to a couple of announcement very soon. And... we need some kind of 'corporate identity' - Over at the MSCC website there is a call for action (or better said a contest with prizes) to create a unique design for the MSCC. This would include a decent colour palette, a logo, graphical banners for Meetup, Google+, Facebook, LinkedIn, etc. and of course badges for our craftsmen to add to their personal blogs and websites. Please spread the word and contribute. Thanks!

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  • The How-To Geek Holiday Gift Guide (Geeky Stuff We Like)

    - by The Geek
    Welcome to the very first How-To Geek Holiday Gift Guide, where we’ve put together a list of our absolute favorites to help you weed through all of the junk out there to pick the perfect gift for anybody. Though really, it’s just a list of the geeky stuff we want. We’ve got a whole range of items on the list, from cheaper gifts that most anybody can afford, to the really expensive stuff that we’re pretty sure nobody is giving us. Stocking Stuffers Here’s a couple of ideas for items that won’t break the bank. LED Keychain Micro-Light   Magcraft 1/8-Inch Rare Earth Cube Magnets Best little LED keychain light around. If they don’t need the penknife of the above item this is the perfect gift. I give them out by the handfuls and nobody ever says anything but good things about them. I’ve got ones that are years old and still running on the same battery.  Price: $8   Geeks cannot resist magnets. Jason bought this pack for his fridge because he was sick of big clunky magnets… these things are amazing. One tiny magnet, smaller than an Altoid mint, can practically hold a clipboard right to the fridge. Amazing. I spend more time playing with them on the counter than I do actually hanging stuff.  Price: $10 Lots of Geeky Mugs   Astronomy Powerful Green Laser Pointer There’s loads of fun, geeky mugs you can find on Amazon or anywhere else—and they are great choices for the geek who loves their coffee. You can get the Caffeine mug pictured here, or go with an Atari one, Canon Lens, or the Aperture mug based on Portal. Your choice. Price: $7   No, it’s not a light saber, but it’s nearly bright enough to be one—you can illuminate low flying clouds at night or just blind some aliens on your day off. All that for an extremely low price. Loads of fun. Price: $15       Geeky TV Shows and Books Sometimes you just want to relax and enjoy a some TV or a good book. Here’s a few choices. The IT Crowd Fourth Season   Doctor Who, Complete Fifth Series Ridiculous, funny show about nerds in the IT department, loved by almost all the geeks here at HTG. Justin even makes this required watching for new hires in his office so they’ll get his jokes. You can pre-order the fourth season, or pick up seasons one, two, or three for even cheaper. Price: $13   It doesn’t get any more nerdy than Eric’s pick, the fifth all-new series of Doctor Who, where the Daleks are hatching a new master plan from the heart of war-torn London. There’s also alien vampires, humanoid reptiles, and a lot more. Price: $52 Battlestar Galactica Complete Series   MAKE: Electronics: Learning Through Discovery Watch the epic fight to save the human race by finding the fabled planet Earth while being hunted by the robotic Cylons. You can grab the entire series on DVD or Blu-ray, or get the seasons individually. This isn’t your average sci-fi TV show. Price: $150 for Blu-ray.   Want to learn the fundamentals of electronics in a fun, hands-on way? The Make:Electronics book helps you build the circuits and learn how it all works—as if you had any more time between all that registry hacking and loading software on your new PC. Price: $21       Geeky Gadgets for the Gadget-Loving Geek Here’s a few of the items on our gadget list, though lets be honest: geeks are going to love almost any gadget, especially shiny new ones. Klipsch Image S4i Premium Noise-Isolating Headset with 3-Button Apple Control   GP2X Caanoo MAME/Console Emulator If you’re a real music geek looking for some serious quality in the headset for your iPhone or iPod, this is the pair that Alex recommends. They aren’t terribly cheap, but you can get the less expensive S3 earphones instead if you prefer. Price: $50-100   Eric says: “As an owner of an older version, I can say the GP2X is one of my favorite gadgets ever. Touted a “Retro Emulation Juggernaut,” GP2X runs Linux and may be the only open source software console available. Sounds too good to be true, but isn’t.” Price: $150 Roku XDS Streaming Player 1080p   Western Digital WD TV Live Plus HD Media Player If you do a lot of streaming over Netflix, Hulu Plus, Amazon’s Video on Demand, Pandora, and others, the Roku box is a great choice to get your content on your TV without paying a lot of money.  It’s also got Wireless-N built in, and it supports full 1080P HD. Price: $99   If you’ve got a home media collection sitting on a hard drive or a network server, the Western Digital box is probably the cheapest way to get that content on your TV, and it even supports Netflix streaming too. It’ll play loads of formats in full HD quality. Price: $99 Fujitsu ScanSnap S300 Color Mobile Scanner   Doxie, the amazing scanner for documents Trevor said: “This wonderful little scanner has become absolutely essential to me. My desk used to just be a gigantic pile of papers that I didn’t need at the moment, but couldn’t throw away ‘just in case.’ Now, every few weeks, I’ll run that paper pile through this and then happily shred the originals!” Price: $300   If you don’t scan quite as often and are looking for a budget scanner you can throw into your bag, or toss into a drawer in your desk, the Doxie scanner is a great alternative that I’ve been using for a while. It’s half the price, and while it’s not as full-featured as the Fujitsu, it might be a better choice for the very casual user. Price: $150       (Expensive) Gadgets Almost Anybody Will Love If you’re not sure that one of the more geeky presents is gonna work, here’s some gadgets that just about anybody is going to love, especially if they don’t have one already. Of course, some of these are a bit on the expensive side—but it’s a wish list, right? Amazon Kindle       The Kindle weighs less than a paperback book, the screen is amazing and easy on the eyes, and get ready for the kicker: the battery lasts at least a month. We aren’t kidding, either—it really lasts that long. If you don’t feel like spending money for books, you can use it to read PDFs, and if you want to get really geeky, you can hack it for custom screensavers. Price: $139 iPod Touch or iPad       You can’t go wrong with either of these presents—the iPod Touch can do almost everything the iPhone can do, including games, apps, and music, and it has the same Retina display as the iPhone, HD video recording, and a front-facing camera so you can use FaceTime. Price: $229+, depending on model. The iPad is a great tablet for playing games, browsing the web, or just using on your coffee table for guests. It’s well worth buying one—but if you’re buying for yourself, keep in mind that the iPad 2 is probably coming out in 3 months. Price: $500+ MacBook Air  The MacBook Air comes in 11” or 13” versions, and it’s an amazing little machine. It’s lightweight, the battery lasts nearly forever, and it resumes from sleep almost instantly. Since it uses an SSD drive instead of a hard drive, you’re barely going to notice any speed problems for general use. So if you’ve got a lot of money to blow, this is a killer gift. Price: $999 and up. Stuck with No Idea for a Present? Gift Cards! Yeah, you’re not going to win any “thoughtful present” awards with these, but you might just give somebody what they really want—the new Angry Birds HD for their iPad, Cut the Rope, or anything else they want. ITunes Gift Card   Amazon.com Gift Card Somebody in your circle getting a new iPod, iPhone, or iPad? You can get them an iTunes gift card, which they can use to buy music, games or apps. Yep, this way you can gift them a copy of Angry Birds if they don’t already have it. Or even Cut the Rope.   No clue what to get somebody on your list? Amazon gift cards let them buy pretty much anything they want, from organic weirdberries to big screen TVs. Yeah, it’s not as thoughtful as getting them a nice present, but look at the bright side: maybe they’ll get you an Amazon gift card and it’ll balance out. That’s the highlights from our lists—got anything else to add? Share your geeky gift ideas in the comments. Latest Features How-To Geek ETC The How-To Geek Holiday Gift Guide (Geeky Stuff We Like) LCD? LED? Plasma? The How-To Geek Guide to HDTV Technology The How-To Geek Guide to Learning Photoshop, Part 8: Filters Improve Digital Photography by Calibrating Your Monitor Our Favorite Tech: What We’re Thankful For at How-To Geek The How-To Geek Guide to Learning Photoshop, Part 7: Design and Typography Happy Snow Bears Theme for Chrome and Iron [Holiday] Download Full Command and Conquer: Tiberian Sun Game for Free Scorched Cometary Planet Wallpaper Quick Fix: Add the RSS Button Back to the Firefox Awesome Bar Dropbox Desktop Client 1.0.0 RC for Windows, Linux, and Mac Released Hang in There Scrat! – Ice Age Wallpaper

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  • SQL SERVER – Guest Posts – Feodor Georgiev – The Context of Our Database Environment – Going Beyond the Internal SQL Server Waits – Wait Type – Day 21 of 28

    - by pinaldave
    This guest post is submitted by Feodor. Feodor Georgiev is a SQL Server database specialist with extensive experience of thinking both within and outside the box. He has wide experience of different systems and solutions in the fields of architecture, scalability, performance, etc. Feodor has experience with SQL Server 2000 and later versions, and is certified in SQL Server 2008. In this article Feodor explains the server-client-server process, and concentrated on the mutual waits between client and SQL Server. This is essential in grasping the concept of waits in a ‘global’ application plan. Recently I was asked to write a blog post about the wait statistics in SQL Server and since I had been thinking about writing it for quite some time now, here it is. It is a wide-spread idea that the wait statistics in SQL Server will tell you everything about your performance. Well, almost. Or should I say – barely. The reason for this is that SQL Server is always a part of a bigger system – there are always other players in the game: whether it is a client application, web service, any other kind of data import/export process and so on. In short, the SQL Server surroundings look like this: This means that SQL Server, aside from its internal waits, also depends on external waits and settings. As we can see in the picture above, SQL Server needs to have an interface in order to communicate with the surrounding clients over the network. For this communication, SQL Server uses protocol interfaces. I will not go into detail about which protocols are best, but you can read this article. Also, review the information about the TDS (Tabular data stream). As we all know, our system is only as fast as its slowest component. This means that when we look at our environment as a whole, the SQL Server might be a victim of external pressure, no matter how well we have tuned our database server performance. Let’s dive into an example: let’s say that we have a web server, hosting a web application which is using data from our SQL Server, hosted on another server. The network card of the web server for some reason is malfunctioning (think of a hardware failure, driver failure, or just improper setup) and does not send/receive data faster than 10Mbs. On the other end, our SQL Server will not be able to send/receive data at a faster rate either. This means that the application users will notify the support team and will say: “My data is coming very slow.” Now, let’s move on to a bit more exciting example: imagine that there is a similar setup as the example above – one web server and one database server, and the application is not using any stored procedure calls, but instead for every user request the application is sending 80kb query over the network to the SQL Server. (I really thought this does not happen in real life until I saw it one day.) So, what happens in this case? To make things worse, let’s say that the 80kb query text is submitted from the application to the SQL Server at least 100 times per minute, and as often as 300 times per minute in peak times. Here is what happens: in order for this query to reach the SQL Server, it will have to be broken into a of number network packets (according to the packet size settings) – and will travel over the network. On the other side, our SQL Server network card will receive the packets, will pass them to our network layer, the packets will get assembled, and eventually SQL Server will start processing the query – parsing, allegorizing, generating the query execution plan and so on. So far, we have already had a serious network overhead by waiting for the packets to reach our Database Engine. There will certainly be some processing overhead – until the database engine deals with the 80kb query and its 20 subqueries. The waits you see in the DMVs are actually collected from the point the query reaches the SQL Server and the packets are assembled. Let’s say that our query is processed and it finally returns 15000 rows. These rows have a certain size as well, depending on the data types returned. This means that the data will have converted to packages (depending on the network size package settings) and will have to reach the application server. There will also be waits, however, this time you will be able to see a wait type in the DMVs called ASYNC_NETWORK_IO. What this wait type indicates is that the client is not consuming the data fast enough and the network buffers are filling up. Recently Pinal Dave posted a blog on Client Statistics. What Client Statistics does is captures the physical flow characteristics of the query between the client(Management Studio, in this case) and the server and back to the client. As you see in the image, there are three categories: Query Profile Statistics, Network Statistics and Time Statistics. Number of server roundtrips–a roundtrip consists of a request sent to the server and a reply from the server to the client. For example, if your query has three select statements, and they are separated by ‘GO’ command, then there will be three different roundtrips. TDS Packets sent from the client – TDS (tabular data stream) is the language which SQL Server speaks, and in order for applications to communicate with SQL Server, they need to pack the requests in TDS packets. TDS Packets sent from the client is the number of packets sent from the client; in case the request is large, then it may need more buffers, and eventually might even need more server roundtrips. TDS packets received from server –is the TDS packets sent by the server to the client during the query execution. Bytes sent from client – is the volume of the data set to our SQL Server, measured in bytes; i.e. how big of a query we have sent to the SQL Server. This is why it is best to use stored procedures, since the reusable code (which already exists as an object in the SQL Server) will only be called as a name of procedure + parameters, and this will minimize the network pressure. Bytes received from server – is the amount of data the SQL Server has sent to the client, measured in bytes. Depending on the number of rows and the datatypes involved, this number will vary. But still, think about the network load when you request data from SQL Server. Client processing time – is the amount of time spent in milliseconds between the first received response packet and the last received response packet by the client. Wait time on server replies – is the time in milliseconds between the last request packet which left the client and the first response packet which came back from the server to the client. Total execution time – is the sum of client processing time and wait time on server replies (the SQL Server internal processing time) Here is an illustration of the Client-server communication model which should help you understand the mutual waits in a client-server environment. Keep in mind that a query with a large ‘wait time on server replies’ means the server took a long time to produce the very first row. This is usual on queries that have operators that need the entire sub-query to evaluate before they proceed (for example, sort and top operators). However, a query with a very short ‘wait time on server replies’ means that the query was able to return the first row fast. However a long ‘client processing time’ does not necessarily imply the client spent a lot of time processing and the server was blocked waiting on the client. It can simply mean that the server continued to return rows from the result and this is how long it took until the very last row was returned. The bottom line is that developers and DBAs should work together and think carefully of the resource utilization in the client-server environment. From experience I can say that so far I have seen only cases when the application developers and the Database developers are on their own and do not ask questions about the other party’s world. I would recommend using the Client Statistics tool during new development to track the performance of the queries, and also to find a synchronous way of utilizing resources between the client – server – client. Here is another example: think about similar setup as above, but add another server to the game. Let’s say that we keep our media on a separate server, and together with the data from our SQL Server we need to display some images on the webpage requested by our user. No matter how simple or complicated the logic to get the images is, if the images are 500kb each our users will get the page slowly and they will still think that there is something wrong with our data. Anyway, I don’t mean to get carried away too far from SQL Server. Instead, what I would like to say is that DBAs should also be aware of ‘the big picture’. I wrote a blog post a while back on this topic, and if you are interested, you can read it here about the big picture. And finally, here are some guidelines for monitoring the network performance and improving it: Run a trace and outline all queries that return more than 1000 rows (in Profiler you can actually filter and sort the captured trace by number of returned rows). This is not a set number; it is more of a guideline. The general thought is that no application user can consume that many rows at once. Ask yourself and your fellow-developers: ‘why?’. Monitor your network counters in Perfmon: Network Interface:Output queue length, Redirector:Network errors/sec, TCPv4: Segments retransmitted/sec and so on. Make sure to establish a good friendship with your network administrator (buy them coffee, for example J ) and get into a conversation about the network settings. Have them explain to you how the network cards are setup – are they standalone, are they ‘teamed’, what are the settings – full duplex and so on. Find some time to read a bit about networking. In this short blog post I hope I have turned your attention to ‘the big picture’ and the fact that there are other factors affecting our SQL Server, aside from its internal workings. As a further reading I would still highly recommend the Wait Stats series on this blog, also I would recommend you have the coffee break conversation with your network admin as soon as possible. This guest post is written by Feodor Georgiev. Read all the post in the Wait Types and Queue series. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, Readers Contribution, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQL Wait Stats, SQL Wait Types, T SQL

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  • Techie Land Silly Questions

    - by GeekAgilistMercenary
    Ok, it is time for an off the cuff, random, oddball, just for fun blog entry.  Two questions for the readers in Internet Land. Question #1:  If you did not have to work, had a few dollars stashed away so that you could live comfortably and do whatever you wanted, what would you do?  Would you still code?  Would you still create?  What would you create?  Would you be able to stay idle? Question #2:  Based on whatever you did with your free time, what would you title yourself?  Chief Potato Masher, Pencil Pushing Writer o’ Stories, or Coffee Endeavorer o’ Tastiness? There are a million possibilities, I would love to know what you would call yourself, so please do leave a comment or three. I will have my answers later in the week.  So stay tuned and help me out with some comments.  You can bet it will include something along the lines of what I already do, but I'll keep it a secret until then.  : )  Feel free to check out the original entry here to leave a comment.

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  • Best of "The Moth" 2011

    - by Daniel Moth
    Once again (like in 2004, 2005, 2006, 2007, 2008, 2009, 2010) the time has come to wish you a Happy New Year and to share my favorite posts from the year we just left behind. 1. My first blog entry in January and last one in December were both about my Windows Phone app: Translator by Moth and Translator by Moth v2. In between, I shared a few code snippets for Windows Phone development including a watermark textbox, a scroll helper, an RTL helper and a network connectivity helper - there will be more coming in 2012. 2. Efficiently using Microsoft Office products is the hallmark of an efficient Program Manager (and not only), and I'll continue sharing tips on this blog in that area. An example from last year is tracking changes in SharePoint-hosted Word document. 3. Half-way through last year I moved from managing the parallel debugger team to managing the C++ AMP team (both of them in Visual Studio 11). That means I had to deprioritize sharing content on VS parallel debugging features (I promise to do that in 2012), and it also meant that I wrote a lot about C++ AMP. You'll need a few cups of coffee to go through all of it, and most of the links were aggregated on this single highly recommended post: Give a session on C++ AMP – here is how You can stay tuned for more by subscribing via one of the options on the left… Comments about this post by Daniel Moth welcome at the original blog.

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  • 'rman' cheat-sheet and rlwrap completion

    - by katsumii
    I started using 'rlwrap' some monthes ago like one of my colleague does.bash-like features in sqlplus, rman and other Oracle command line tools (Oracle Luxembourg Core Tech' Blog by Gilles Haro)One can find specific Oracle extension for databases 9i, 10g and 11g (keyword textfile) over here. This will avoid you the need to create this .oracle_keywords file.There is 'rman' keyword file in the link above. I experimented a little and found some missing keywords which are:MAXCORRUPTION PRIMARY NOCFAU VIRTUAL COMPRESSION FOREIGN With these words added, 'rman' works like this:$ rlwrap -f ~/rman $ORACLE_HOME/bin/rman Recovery Manager: Release 11.2.0.3.0 - Production on Mon Dec 3 02:56:04 2012 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. RMAN> <-- Hit TAB Display all 211 possibilities? (y or n) As you can guess, this completion is not context aware.I found these missing words by creating a kind of 'cheat sheet' for rman with the script like below. This sheet contains list of verbs and 1st operands. I uploaded to here so one can create a coffee cup with a lot of esoteric words printed on :)validWords() { sed -n 's/^RMAN-01009: syntax error: found "identifier": expecting one of: //p' \ | sed -r 's/double-quoted-string, single-quoted-string/Some String/;s/, /" "/g;s/""//' } echo "Bogus" | rman | validWords > /tmp/rman.$$ for i in $(cat /tmp/rman.$$) do i=$(echo $i | tr -d '"') echo "#### $i ####" echo "$i Bogus" | rman | validWords done One can find more keywords in the document here.

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  • Thinking of Adopting the PRINCE2™ Project Management Methodology? Consider Using PeopleSoft Projects to Help

    - by Megan Boundey
    Ever wondered what the PRINCE2™ project management methodology is? Ever wondered if you could use PeopleSoft Projects (ESA) to manage your projects using PRINCE2™?  Published by the Office of Government Commerce in the UK, PRINCE2™ is a scalable, business case and product description-driven Project Management methodology based upon managing by exception. Project activities are organized around fulfilling and meeting the product description. Quality assurance, configuration control and risk management are all based upon ensuring that the product delivered accurately meets the product description. PRINCE2™ is built upon seven principles and seven themes, each underpinning the PRINCE2™project management processes. Important for today’s business environment, the focus throughout PRINCE2™ is on the Business Case, which describes the rationale and business justification for a project. The Business Case drives all the project management processes from initial project setup to successful finish. PRINCE2™, as a method and a certification, is adopted in many countries worldwide, including the UK, Western Europe and Australia. We’ve just released a new white paper, which provides you with an overview of the principles, themes and project management processes associated with PRINCE2™. It also shows how these map to the functionality available within PeopleSoft Projects (ESA). In the time it takes to drink a coffee, you can learn about PRINCE2™ and determine whether it might help you deliver better project results. We encourage you to take a look.

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  • UK Partner Briefing – Business Analytics - 24 Sept 2012

    - by Mike.Hallett(at)Oracle-BI&EPM
    Monday 24th September 2012 - Oracle City Office, London Register Here for this important, free briefing Oracle Partners are invited to attend this Business Analytics Partner Briefing on 24th September 2012 in Oracle’s London Moorgate Offices with Particular focus on Exalytics, Endeca and, BI Mobile. Who should attend? Oracle Business Analytics is one of our fastest growing product lines, hence this briefing will be of value to any executives looking for new business opportunities or extending their existing Analytics line of business Background This half day event will inform you of Oracle's Business Analytics strategy, how your organisation can gain commercial advantage from reselling and deploying Oracle's BI portfolio, and the tools and resources to support your sales engagements. Agenda 13:45 – Registration, Coffee, and iPad set up 14:30 – Briefing Commences: Welcome & Introduction to the Business Analytics FY13 Strategy from Mike Pell, VP UK Business Analytics Sales 15:15 – Exalytics: Speed of Thought Analytics 16:00 – Mobile BI & Endeca 16:45 – Event Wrap-up and Q&A 17:00 – Meet the UK BI Sales Team: Networking Please note – If you have an iPad please bring it with you to the session, as we will be helping to set these up with BI Mobile from 13:45 onwards. Click here to register now for this briefing for Oracle Partners. Best regards, Mike Pell                                  Duncan Fitter                           Mike Thompson VP UK Analytics Sales             BA Business Development       Alliances & Channels

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  • Why do we need URIs for XML namespaces?

    - by Patryk
    I am trying to figure out why we need URIs for XML namespaces and I cannot find a purpose for that. Can anyone brighten me a little showing their use on a concrete example? EDIT: Ok so for instance: I have this from w3schools <root xmlns:h="http://www.w3.org/TR/html4/" xmlns:f="http://www.w3schools.com/furniture"> <h:table> <h:tr> <h:td>Apples</h:td> <h:td>Bananas</h:td> </h:tr> </h:table> <f:table> <f:name>African Coffee Table</f:name> <f:width>80</f:width> <f:length>120</f:length> </f:table> </root> So what should http://www.w3schools.com/furniture hold ?

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  • Formação: Gestão do Conhecimento 2.0 - (18/Mai/10)

    - by Claudia Costa
    Nas organizações o conceito de intranet está a evoluir de um simples repositório de documentos e links para uma plataforma colaborativa, onde os colaboradores podem consultar, navegar, publicar, analisar, comentar e valorizar os seus conhecimentos e de outros.   Durante esta sessão apresentaremos os produtos e proposta de valor da Oracle para a evolução da intranet e gestão do conhecimento 2.0 (também conhecido como Social KM).   Agenda 09:15 - Café de Boas Vindas & Registo 09:30 - Gestão do Conhecimento 2.0 10:30 - Demo de GdC 2.0 com Oracle 11:00 - Coffee Break 11:30 - Oracle WebCenter Framework 12:30 - Oracle WebCenter Spaces 13:30 - Conclusão   Pré-requisitos Cada participante deverá trazer o seu Laptop preparado com as seguintes características: ·         2GB RAM, com acesso a WiFi ·         Disco rígido com 25GB de espaço livre (caso queira gravar a máquina virtal a disponibilizar durante a sessão)   --------------------------------------------------------------------------------------------------   Clique aqui e registe-se.   Horário e Local: 9h30 - 14h30 Instalações Oracle Lagoas Park - Edf. 8 Porto Salvo   Para mais informações, por favor contacte: Melissa Lopes 214235194

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  • CoffeeScript Test Framework

    - by Liam McLennan
    Tonight the Brisbane Alt.NET group is doing a coding dojo. I am hoping to talk someone into pairing with me to solve the kata in CoffeeScript. CoffeeScript is an awesome language, half javascript, half ruby, that compiles to javascript. To assist with tonight’s dojo I wrote the following micro test framework for CoffeeScript: <html> <body> <div> <h2>Test Results:</h2> <p class='results' /> </div> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" type="text/javascript"></script> <script type="text/coffeescript"> # super simple test framework test: { write: (s) -> $('.results').append(s + '<br/>') assert: (b, message...) -> test.write(if b then "pass" else "fail: " + message) tests: [] exec: () -> for t in test.tests test.write("<br/><b>$t.name</b>") t.func() } # add some tests test.tests.push { name: "First Test" func: () -> test.assert(true) } test.tests.push { name: "Another Test" func: () -> test.assert(false, "You loose") } # run them test.exec(test.tests) </script> <script type="text/javascript" src="coffee-script.js"></script> </body> </html> It’s not the prettiest, but as far as I know it is the only CoffeeScript test framework in existence. Of course, I could just use one of the javascript test frameworks but that would be no fun. To get this example to run you need the coffeescript compiler in the same directory as the page.

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