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• Hosting a website on Heroku.... I know how to, but im running into problems!

  - by Thomas Miller

  I'm starting to learn more on the back-end scale of programing. Recently I started up Heroku for the second or third time. This time I actually installed the Git update to my Mac and installed Heroku in the terminal. I wanted to upload a static html site with the sinatra gem. Everything worked out fine inside the terminal, though I added sinatra after I got everything working and the file with the site hooked up to Heroku. In my logs I did see that I was missing the sinatra gem, so I installed it. My site contains both the proper app.rb and config.ru files. I have nothing showing up online. Just a blank screen! Contacting Heroku on this problem has been very difficult. I get a responce every day, and on every day I respond with a question to the answer that didn't help me at all. 2011-05-18T00:25:20+00:00 app[web.1]: 71.198.0.51 - - [17/May/2011 17:25:20] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T00:25:20+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=2ms bytes=313 2011-05-18T00:25:26+00:00 app[web.1]: 71.198.0.51 - - [17/May/2011 17:25:26] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T00:25:26+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=5ms bytes=313 2011-05-17T18:25:51-07:00 heroku[web.1]: Idling 2011-05-17T18:26:01-07:00 heroku[web.1]: State changed from up to down 2011-05-18T01:26:01+00:00 heroku[web.1]: Stopping process with SIGTERM 2011-05-18T01:26:01+00:00 app[web.1]: Stopping ... 2011-05-18T01:26:02+00:00 heroku[web.1]: Process exited 2011-05-17T20:12:46-07:00 heroku[web.1]: Unidling 2011-05-17T20:12:47-07:00 heroku[web.1]: State changed from created to starting 2011-05-18T03:12:48+00:00 heroku[web.1]: Starting process with command: thin -p 40055 -e production -R /home/heroku_rack/heroku.ru start 2011-05-18T03:12:49+00:00 app[web.1]: Thin web server (v1.2.6 codename Crazy Delicious) 2011-05-18T03:12:49+00:00 app[web.1]: Maximum connections set to 1024 2011-05-18T03:12:49+00:00 app[web.1]: Listening on 0.0.0.0:40055, CTRL+C to stop 2011-05-18T03:12:50+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=9954ms service=6ms bytes=565 2011-05-18T03:12:50+00:00 app[web.1]: 70.91.206.114 - - [17/May/2011 20:12:50] "GET /style.css HTTP/1.1" 200 - 0.0012 2011-05-18T03:12:50+00:00 heroku[router]: GET pxlc.heroku.com/style.css dyno=web.1 queue=0 wait=0ms service=2ms bytes=269 2011-05-17T20:12:50-07:00 heroku[web.1]: State changed from starting to up 2011-05-18T03:12:51+00:00 app[web.1]: 70.91.206.114 - - [17/May/2011 20:12:51] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T03:12:51+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=4ms bytes=313 2011-05-18T03:13:05+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=0ms service=5ms bytes=565 2011-05-18T03:13:05+00:00 app[web.1]: 70.91.206.114 - - [17/May/2011 20:13:05] "GET / HTTP/1.1" 200 293 0.0011 2011-05-18T03:13:05+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=2ms bytes=313 2011-05-18T03:13:05+00:00 app[web.1]: 70.91.206.114 - - [17/May/2011 20:13:05] "GET /favicon.ico HTTP/1.1" 404 18 0.0007 2011-05-18T03:57:05+00:00 app[web.1]: 172.18.33.56, 58.96.134.66 - - [17/May/2011 20:57:05] "GET / HTTP/1.1" 200 293 0.0007 2011-05-18T03:57:05+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=0ms service=4ms bytes=565 2011-05-18T03:57:05+00:00 app[web.1]: 172.18.33.56, 58.96.134.66 - - [17/May/2011 20:57:05] "GET /style.css HTTP/1.1" 200 - 0.0007 2011-05-18T03:57:05+00:00 heroku[router]: GET pxlc.heroku.com/style.css dyno=web.1 queue=0 wait=0ms service=2ms bytes=269 2011-05-18T03:57:08+00:00 app[web.1]: 172.18.33.56, 58.96.134.66 - - [17/May/2011 20:57:08] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-17T21:58:27-07:00 heroku[web.1]: Idling 2011-05-18T04:58:30+00:00 heroku[web.1]: Stopping process with SIGTERM 2011-05-18T04:58:30+00:00 app[web.1]: Stopping ... 2011-05-18T04:58:30+00:00 heroku[web.1]: Process exited 2011-05-17T21:58:33-07:00 heroku[web.1]: State changed from up to down 2011-05-17T23:11:58-07:00 heroku[web.1]: Unidling 2011-05-17T23:11:58-07:00 heroku[web.1]: State changed from created to starting 2011-05-18T06:12:00+00:00 heroku[web.1]: Starting process with command: thin -p 40091 -e production -R /home/heroku_rack/heroku.ru start 2011-05-18T06:12:01+00:00 app[web.1]: Thin web server (v1.2.6 codename Crazy Delicious) 2011-05-18T06:12:01+00:00 app[web.1]: Maximum connections set to 1024 2011-05-18T06:12:01+00:00 app[web.1]: Listening on 0.0.0.0:40091, CTRL+C to stop 2011-05-18T06:12:01+00:00 app[web.1]: 183.97.156.226 - - [17/May/2011 23:12:01] "GET / HTTP/1.1" 200 293 0.0017 2011-05-18T06:12:02+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=3209ms service=5ms bytes=565 2011-05-18T06:12:03+00:00 app[web.1]: 183.97.156.226 - - [17/May/2011 23:12:03] "GET /style.css HTTP/1.1" 200 - 0.0019 2011-05-17T23:12:08-07:00 heroku[web.1]: State changed from starting to up 2011-05-18T00:13:13-07:00 heroku[web.1]: Idling 2011-05-18T00:13:16-07:00 heroku[web.1]: State changed from up to down 2011-05-18T07:13:16+00:00 heroku[web.1]: Stopping process with SIGTERM 2011-05-18T07:13:16+00:00 app[web.1]: Stopping ... 2011-05-18T07:13:17+00:00 heroku[web.1]: Process exited 2011-05-18T01:54:21-07:00 heroku[web.1]: Unidling 2011-05-18T01:54:21-07:00 heroku[web.1]: State changed from created to starting 2011-05-18T08:54:23+00:00 heroku[web.1]: Starting process with command: thin -p 59491 -e production -R /home/heroku_rack/heroku.ru start 2011-05-18T08:54:24+00:00 app[web.1]: Thin web server (v1.2.6 codename Crazy Delicious) 2011-05-18T08:54:24+00:00 app[web.1]: Maximum connections set to 1024 2011-05-18T08:54:24+00:00 app[web.1]: Listening on 0.0.0.0:59491, CTRL+C to stop 2011-05-18T01:54:28-07:00 heroku[web.1]: State changed from starting to up 2011-05-18T08:54:28+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=6943ms service=6ms bytes=565 2011-05-18T08:54:28+00:00 app[web.1]: 62.244.82.72 - - [18/May/2011 01:54:28] "GET / HTTP/1.1" 200 293 0.0018 2011-05-18T08:54:28+00:00 heroku[router]: GET pxlc.heroku.com/style.css dyno=web.1 queue=0 wait=0ms service=2ms bytes=269 2011-05-18T08:54:28+00:00 app[web.1]: 62.244.82.72 - - [18/May/2011 01:54:28] "GET /style.css HTTP/1.1" 200 - 0.0014 2011-05-18T08:54:28+00:00 app[web.1]: 62.244.82.72 - - [18/May/2011 01:54:28] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T08:54:28+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=1ms bytes=313 2011-05-18T08:54:28+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=4ms bytes=313 2011-05-18T08:54:28+00:00 app[web.1]: 62.244.82.72 - - [18/May/2011 01:54:28] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T08:54:28+00:00 app[web.1]: 62.244.82.72 - - [18/May/2011 01:54:28] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T08:54:28+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=1ms bytes=313 2011-05-18T02:55:23-07:00 heroku[web.1]: Idling 2011-05-18T02:55:33-07:00 heroku[web.1]: State changed from up to down 2011-05-18T09:55:34+00:00 heroku[web.1]: Stopping process with SIGTERM 2011-05-18T09:55:34+00:00 app[web.1]: Stopping ... 2011-05-18T09:55:34+00:00 heroku[web.1]: Process exited 2011-05-18T07:23:10-07:00 heroku[web.1]: State changed from created to starting 2011-05-18T14:23:12+00:00 heroku[web.1]: Starting process with command: thin -p 20560 -e production -R /home/heroku_rack/heroku.ru start 2011-05-18T14:23:13+00:00 app[web.1]: Thin web server (v1.2.6 codename Crazy Delicious) 2011-05-18T14:23:13+00:00 app[web.1]: Maximum connections set to 1024 2011-05-18T14:23:13+00:00 app[web.1]: Listening on 0.0.0.0:20560, CTRL+C to stop 2011-05-18T07:23:13-07:00 heroku[web.1]: State changed from starting to up 2011-05-18T14:23:14+00:00 app[web.1]: 12.183.19.10 - - [18/May/2011 07:23:14] "GET / HTTP/1.1" 200 293 0.0018 2011-05-18T14:23:14+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=0ms service=7ms bytes=565 2011-05-18T14:23:14+00:00 app[web.1]: 12.183.19.10 - - [18/May/2011 07:23:14] "GET /style.css HTTP/1.1" 200 - 0.0015 2011-05-18T14:23:14+00:00 heroku[router]: GET pxlc.heroku.com/style.css dyno=web.1 queue=0 wait=0ms service=2ms bytes=269 2011-05-18T14:23:14+00:00 app[web.1]: 12.183.19.10 - - [18/May/2011 07:23:14] "GET /favicon.ico HTTP/1.1" 404 18 0.0009 2011-05-18T14:23:14+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=2ms bytes=313 2011-05-18T08:24:03-07:00 heroku[web.1]: Idling 2011-05-18T08:24:07-07:00 heroku[web.1]: State changed from up to down 2011-05-18T15:24:07+00:00 heroku[web.1]: Stopping process with SIGTERM 2011-05-18T15:24:07+00:00 app[web.1]: Stopping ... 2011-05-18T17:34:27-07:00 heroku[web.1]: Unidling 2011-05-18T17:34:28-07:00 heroku[web.1]: State changed from created to starting 2011-05-19T00:34:29+00:00 heroku[web.1]: Starting process with command: thin -p 57621 -e production -R /home/heroku_rack/heroku.ru start 2011-05-18T17:34:31-07:00 heroku[web.1]: State changed from starting to up 2011-05-19T00:34:32+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=0ms service=5ms bytes=565 2011-05-19T00:34:32+00:00 app[web.1]: 97.83.58.74 - - [18/May/2011 17:34:32] "GET / HTTP/1.1" 200 293 0.0016 2011-05-19T00:34:32+00:00 app[web.1]: 97.83.58.74 - - [18/May/2011 17:34:32] "GET /style.css HTTP/1.1" 200 - 0.0011 2011-05-19T00:34:32+00:00 heroku[router]: GET pxlc.heroku.com/style.css dyno=web.1 queue=0 wait=0ms service=2ms bytes=269 2011-05-19T00:34:34+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=4ms bytes=313 2011-05-19T00:34:34+00:00 app[web.1]: 97.83.58.74 - - [18/May/2011 17:34:34] "GET /favicon.ico HTTP/1.1" 404 18 0.0007 2011-05-18T18:35:48-07:00 heroku[web.1]: Idling 2011-05-18T18:35:51-07:00 heroku[web.1]: State changed from up to down

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• Can't run init script on boot after another init script

  - by Colin McQueen

  I have three init scripts and the Broker init script runs fine, but when I try to run the Consumer init script and then the Data Collector init script, the only process that is running is the Broker. I added the symbolic links to the run levels using update-rc.d for each script and I also changed the number prefixes in the symbolic links to try and run the scripts in the proper order but that did not work. I am able to run the scripts from the terminal and they work fine but they need to all be started on boot. Any ideas as to why my other scripts are not running? Also inside my Consumer and Data Collector I am running: su user1 -c 'java -jar foo.jar' to start the services. Also the Consumer Java class sits and waits for a message from the queue, so the Java code does not stop until I specify the stop argument for the init script. The Broker has to start first, then the Consumer, then the Data Collector. Adding the symbolic links for the runlevels: sudo update-rc.d Broker defaults 10 90 sudo update-rc.d Consumer defaults 15 85 sudo update-rc.d DataCollector defaults 20 80

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• Don’t Sleep Keeps Your Windows Machine Awake

  - by ETC

  Don’t Sleep is an ultra lightweight and portable application that fills a niche need perfect: sometimes you need to temporarily keep your Windows machine from shutting down or power saving without making any permanent changes to your power profile. Fire up portable Don’t Sleep and tell it how long you want it to stop your computer from shutting down, going to sleep (standby/hibernation), and/or keeping the monitor on. At the end of the monitoring period you can have it turn itself off, stay on but stop blocking, or shut down your computer. It’s a great application for those times you need to alter how your computer handles hibernation mode, activating the screensaver, or other automated tasks without making any permanent changes to your power profile or other settings. Hit up the link below to read more and grab a copy. Don’t Sleep is freeware, Windows only. Don’t Sleep [via The Portable Freeware Collection] Latest Features How-To Geek ETC Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions How to Enable User-Specific Wireless Networks in Windows 7 Access the Options for Your Favorite Extensions Easier in Firefox Don’t Sleep Keeps Your Windows Machine Awake DropSpace Syncs Android Files to Dropbox Field of Poppies Wallpaper The History Of Operating Systems [Infographic] DriveSafe.ly Reads Your Text Messages Aloud

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• raid md device is not remove from memory, how to overcome this problem

  - by santhosha

  i create raid 10 , i removed two arrays form md11 one by one , after that i going to editing the contents those are mounted ( it will be not responding stage), after i try for remove arrays those are left it is shows device or resource busy ( is not removed from memory). i try to terminate process this is also not work, i absorve from 4 days resync will be 8.0% it can not modifying. cat /proc/mdstat Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [linear] [raid10] md11 : active raid10 sde1[3] sdj14 286743936 blocks 64K chunks 2 near-copies [4/1] [___U] [1:2:3:0] [=...................] resync = 8.0% (23210368/286743936) finish=289392.6min speed=15K/sec mdadm -D /dev/md11 /dev/md11: Version : 00.90.03 Creation Time : Sun Jan 16 16:20:01 2011 Raid Level : raid10 Array Size : 286743936 (273.46 GiB 293.63 GB) Device Size : 143371968 (136.73 GiB 146.81 GB) Raid Devices : 4 Total Devices : 2 Preferred Minor : 11 Persistence : Superblock is persistent Update Time : Sun Jan 16 16:56:07 2011 State : active, degraded, resyncing Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Layout : near=2, far=1 Chunk Size : 64K Rebuild Status : 8% complete UUID : 5e124ea4:79a01181:dc4110d3:a48576ea Events : 0.23 Number Major Minor RaidDevice State 0 0 0 0 removed 1 0 0 1 removed 4 8 145 2 faulty spare rebuilding /dev/sdj1 3 8 65 3 active sync /dev/sde1 umount /dev/md11 umount: /dev/md11: not mounted mdadm -S /dev/md11 mdadm: fail to stop array /dev/md11: Device or resource busy lsof /dev/md11 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME mount 2128 root 3r BLK 9,11 4058 /dev/md11 mount 5018 root 3r BLK 9,11 4058 /dev/md11 mdadm 27605 root 3r BLK 9,11 4058 /dev/md11 mount 30562 root 3r BLK 9,11 4058 /dev/md11 badblocks 30591 root 3r BLK 9,11 4058 /dev/md11 kill -9 2128 kill -9 5018 kill -9 27605 kill -9 30562 kill -3 30591 mdadm -S /dev/md11 mdadm: fail to stop array /dev/md11: Device or resource busy lsof /dev/md11 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME mount 2128 root 3r BLK 9,11 4058 /dev/md11 mount 5018 root 3r BLK 9,11 4058 /dev/md11 mdadm 27605 root 3r BLK 9,11 4058 /dev/md11 mount 30562 root 3r BLK 9,11 4058 /dev/md11 badblocks 30591 root 3r BLK 9,11 4058 /dev/md11 cat /proc/mdstat Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] [linear] [raid10] md11 : active raid10 sde1[3] sdj14 286743936 blocks 64K chunks 2 near-copies [4/1] [___U] [1:2:3:0] [=...................] resync = 8.0% (23210368/286743936) finish=289392.6min speed=15K/sec

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• Screen shots and documentation on the cheap

  - by Kyle Burns

  Occasionally I am surprised to open up my toolbox and find a great tool that I've had for years and never noticed.  The other day I had just such an experience with Windows Server 2008.  A co-worker of mine was squinting to read to screenshots that he had taken using the "Print Screen, paste" method in WordPad and asked me if there was a better tool available at a reasonable cost.  My first instinct was to take a look at CamStudio for him, but I also knew that he had an immediate need to take some more screenshots, so I decided to check and see if the Snipping Tool found in Windows 7 is also available in Windows Server 2008.  I clicked the Start button and typed “snip” into the search bar and while the Snipping Tool did not come up, a Control Panel item labeled “Record steps to reproduce a problem” did. The application behind the Control Panel entry was “Problem Steps Recorder” (PSR.exe) and I have confirmed that it is available in Windows 7 and Windows Server 2008 R2 but have not checked other platforms.  It presents a pretty minimal and intuitive interface in providing a “Start Record”, “Stop Record”, and “Add Comment” button.  The “Start Record” button shockingly starts recording and, sure enough, the “Stop Record” button stops recording.  The “Add Comment” button prompts for a comment and for you to highlight the area of the screen to which your comment is related.  Once you’re done recording, the tool outputs an MHT file packaged in a ZIP archive.  This file contains a series of screen shots depicting the user’s interactions and giving timestamps and descriptive text (such as “User left click on “Test” in “My Page – Windows Internet Explorer”) as well as the comments they made along the way and some diagnostics about the applications captured. The Problem Steps Recorder looks like a simple solution to the most common of my needs for documentation that can turn “I can’t understand how to make it do what you’re reporting” to “Oh, I see what you’re talking about and will fix it right away”.  I you’re like me and haven’t yet discovered this tool give it a whirl and see for yourself.

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• Hosting a website on Heroku.... I know how to, but im running into problems!

  - by Thomas Miller

  I'm starting to learn more on the back-end scale of programing. Recently I started up Heroku for the second or third time. This time I actually installed the Git update to my Mac and installed Heroku in the terminal. I wanted to upload a static html site with the Sinatra gem. Everything worked out fine inside the terminal, though I added Sinatra after I got everything working and the file with the site hooked up to Heroku. In my logs I did see that I was missing the Sinatra gem, so I installed it. My site contains both the proper app.rb and config.ru files. I have nothing showing up online. Just a blank screen! Contacting Heroku on this problem has been very difficult. I get a response every day, and on every day I respond with a question to the answer that didn't help me at all. 2011-05-18T00:25:20+00:00 app[web.1]: 71.198.0.51 - - [17/May/2011 17:25:20] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T00:25:20+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=2ms bytes=313 2011-05-18T00:25:26+00:00 app[web.1]: 71.198.0.51 - - [17/May/2011 17:25:26] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T00:25:26+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=5ms bytes=313 2011-05-17T18:25:51-07:00 heroku[web.1]: Idling 2011-05-17T18:26:01-07:00 heroku[web.1]: State changed from up to down 2011-05-18T01:26:01+00:00 heroku[web.1]: Stopping process with SIGTERM 2011-05-18T01:26:01+00:00 app[web.1]: >> Stopping ... 2011-05-18T01:26:02+00:00 heroku[web.1]: Process exited 2011-05-17T20:12:46-07:00 heroku[web.1]: Unidling 2011-05-17T20:12:47-07:00 heroku[web.1]: State changed from created to starting 2011-05-18T03:12:48+00:00 heroku[web.1]: Starting process with command: `thin -p 40055 -e production -R /home/heroku_rack/heroku.ru start` 2011-05-18T03:12:49+00:00 app[web.1]: >> Thin web server (v1.2.6 codename Crazy Delicious) 2011-05-18T03:12:49+00:00 app[web.1]: >> Maximum connections set to 1024 2011-05-18T03:12:49+00:00 app[web.1]: >> Listening on 0.0.0.0:40055, CTRL+C to stop 2011-05-18T03:12:50+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=9954ms service=6ms bytes=565 2011-05-18T03:12:50+00:00 app[web.1]: 70.91.206.114 - - [17/May/2011 20:12:50] "GET /style.css HTTP/1.1" 200 - 0.0012 2011-05-18T03:12:50+00:00 heroku[router]: GET pxlc.heroku.com/style.css dyno=web.1 queue=0 wait=0ms service=2ms bytes=269 2011-05-17T20:12:50-07:00 heroku[web.1]: State changed from starting to up 2011-05-18T03:12:51+00:00 app[web.1]: 70.91.206.114 - - [17/May/2011 20:12:51] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T03:12:51+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=4ms bytes=313 2011-05-18T03:13:05+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=0ms service=5ms bytes=565 2011-05-18T03:13:05+00:00 app[web.1]: 70.91.206.114 - - [17/May/2011 20:13:05] "GET / HTTP/1.1" 200 293 0.0011 2011-05-18T03:13:05+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=2ms bytes=313 2011-05-18T03:13:05+00:00 app[web.1]: 70.91.206.114 - - [17/May/2011 20:13:05] "GET /favicon.ico HTTP/1.1" 404 18 0.0007 2011-05-18T03:57:05+00:00 app[web.1]: 172.18.33.56, 58.96.134.66 - - [17/May/2011 20:57:05] "GET / HTTP/1.1" 200 293 0.0007 2011-05-18T03:57:05+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=0ms service=4ms bytes=565 2011-05-18T03:57:05+00:00 app[web.1]: 172.18.33.56, 58.96.134.66 - - [17/May/2011 20:57:05] "GET /style.css HTTP/1.1" 200 - 0.0007 2011-05-18T03:57:05+00:00 heroku[router]: GET pxlc.heroku.com/style.css dyno=web.1 queue=0 wait=0ms service=2ms bytes=269 2011-05-18T03:57:08+00:00 app[web.1]: 172.18.33.56, 58.96.134.66 - - [17/May/2011 20:57:08] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-17T21:58:27-07:00 heroku[web.1]: Idling 2011-05-18T04:58:30+00:00 heroku[web.1]: Stopping process with SIGTERM 2011-05-18T04:58:30+00:00 app[web.1]: >> Stopping ... 2011-05-18T04:58:30+00:00 heroku[web.1]: Process exited 2011-05-17T21:58:33-07:00 heroku[web.1]: State changed from up to down 2011-05-17T23:11:58-07:00 heroku[web.1]: Unidling 2011-05-17T23:11:58-07:00 heroku[web.1]: State changed from created to starting 2011-05-18T06:12:00+00:00 heroku[web.1]: Starting process with command: `thin -p 40091 -e production -R /home/heroku_rack/heroku.ru start` 2011-05-18T06:12:01+00:00 app[web.1]: >> Thin web server (v1.2.6 codename Crazy Delicious) 2011-05-18T06:12:01+00:00 app[web.1]: >> Maximum connections set to 1024 2011-05-18T06:12:01+00:00 app[web.1]: >> Listening on 0.0.0.0:40091, CTRL+C to stop 2011-05-18T06:12:01+00:00 app[web.1]: 183.97.156.226 - - [17/May/2011 23:12:01] "GET / HTTP/1.1" 200 293 0.0017 2011-05-18T06:12:02+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=3209ms service=5ms bytes=565 2011-05-18T06:12:03+00:00 app[web.1]: 183.97.156.226 - - [17/May/2011 23:12:03] "GET /style.css HTTP/1.1" 200 - 0.0019 2011-05-17T23:12:08-07:00 heroku[web.1]: State changed from starting to up 2011-05-18T00:13:13-07:00 heroku[web.1]: Idling 2011-05-18T00:13:16-07:00 heroku[web.1]: State changed from up to down 2011-05-18T07:13:16+00:00 heroku[web.1]: Stopping process with SIGTERM 2011-05-18T07:13:16+00:00 app[web.1]: >> Stopping ... 2011-05-18T07:13:17+00:00 heroku[web.1]: Process exited 2011-05-18T01:54:21-07:00 heroku[web.1]: Unidling 2011-05-18T01:54:21-07:00 heroku[web.1]: State changed from created to starting 2011-05-18T08:54:23+00:00 heroku[web.1]: Starting process with command: `thin -p 59491 -e production -R /home/heroku_rack/heroku.ru start` 2011-05-18T08:54:24+00:00 app[web.1]: >> Thin web server (v1.2.6 codename Crazy Delicious) 2011-05-18T08:54:24+00:00 app[web.1]: >> Maximum connections set to 1024 2011-05-18T08:54:24+00:00 app[web.1]: >> Listening on 0.0.0.0:59491, CTRL+C to stop 2011-05-18T01:54:28-07:00 heroku[web.1]: State changed from starting to up 2011-05-18T08:54:28+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=6943ms service=6ms bytes=565 2011-05-18T08:54:28+00:00 app[web.1]: 62.244.82.72 - - [18/May/2011 01:54:28] "GET / HTTP/1.1" 200 293 0.0018 2011-05-18T08:54:28+00:00 heroku[router]: GET pxlc.heroku.com/style.css dyno=web.1 queue=0 wait=0ms service=2ms bytes=269 2011-05-18T08:54:28+00:00 app[web.1]: 62.244.82.72 - - [18/May/2011 01:54:28] "GET /style.css HTTP/1.1" 200 - 0.0014 2011-05-18T08:54:28+00:00 app[web.1]: 62.244.82.72 - - [18/May/2011 01:54:28] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T08:54:28+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=1ms bytes=313 2011-05-18T08:54:28+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=4ms bytes=313 2011-05-18T08:54:28+00:00 app[web.1]: 62.244.82.72 - - [18/May/2011 01:54:28] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T08:54:28+00:00 app[web.1]: 62.244.82.72 - - [18/May/2011 01:54:28] "GET /favicon.ico HTTP/1.1" 404 18 0.0008 2011-05-18T08:54:28+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=1ms bytes=313 2011-05-18T02:55:23-07:00 heroku[web.1]: Idling 2011-05-18T02:55:33-07:00 heroku[web.1]: State changed from up to down 2011-05-18T09:55:34+00:00 heroku[web.1]: Stopping process with SIGTERM 2011-05-18T09:55:34+00:00 app[web.1]: >> Stopping ... 2011-05-18T09:55:34+00:00 heroku[web.1]: Process exited 2011-05-18T07:23:10-07:00 heroku[web.1]: State changed from created to starting 2011-05-18T14:23:12+00:00 heroku[web.1]: Starting process with command: `thin -p 20560 -e production -R /home/heroku_rack/heroku.ru start` 2011-05-18T14:23:13+00:00 app[web.1]: >> Thin web server (v1.2.6 codename Crazy Delicious) 2011-05-18T14:23:13+00:00 app[web.1]: >> Maximum connections set to 1024 2011-05-18T14:23:13+00:00 app[web.1]: >> Listening on 0.0.0.0:20560, CTRL+C to stop 2011-05-18T07:23:13-07:00 heroku[web.1]: State changed from starting to up 2011-05-18T14:23:14+00:00 app[web.1]: 12.183.19.10 - - [18/May/2011 07:23:14] "GET / HTTP/1.1" 200 293 0.0018 2011-05-18T14:23:14+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=0ms service=7ms bytes=565 2011-05-18T14:23:14+00:00 app[web.1]: 12.183.19.10 - - [18/May/2011 07:23:14] "GET /style.css HTTP/1.1" 200 - 0.0015 2011-05-18T14:23:14+00:00 heroku[router]: GET pxlc.heroku.com/style.css dyno=web.1 queue=0 wait=0ms service=2ms bytes=269 2011-05-18T14:23:14+00:00 app[web.1]: 12.183.19.10 - - [18/May/2011 07:23:14] "GET /favicon.ico HTTP/1.1" 404 18 0.0009 2011-05-18T14:23:14+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=2ms bytes=313 2011-05-18T08:24:03-07:00 heroku[web.1]: Idling 2011-05-18T08:24:07-07:00 heroku[web.1]: State changed from up to down 2011-05-18T15:24:07+00:00 heroku[web.1]: Stopping process with SIGTERM 2011-05-18T15:24:07+00:00 app[web.1]: >> Stopping ... 2011-05-18T17:34:27-07:00 heroku[web.1]: Unidling 2011-05-18T17:34:28-07:00 heroku[web.1]: State changed from created to starting 2011-05-19T00:34:29+00:00 heroku[web.1]: Starting process with command: `thin -p 57621 -e production -R /home/heroku_rack/heroku.ru start` 2011-05-18T17:34:31-07:00 heroku[web.1]: State changed from starting to up 2011-05-19T00:34:32+00:00 heroku[router]: GET pxlc.heroku.com/ dyno=web.1 queue=0 wait=0ms service=5ms bytes=565 2011-05-19T00:34:32+00:00 app[web.1]: 97.83.58.74 - - [18/May/2011 17:34:32] "GET / HTTP/1.1" 200 293 0.0016 2011-05-19T00:34:32+00:00 app[web.1]: 97.83.58.74 - - [18/May/2011 17:34:32] "GET /style.css HTTP/1.1" 200 - 0.0011 2011-05-19T00:34:32+00:00 heroku[router]: GET pxlc.heroku.com/style.css dyno=web.1 queue=0 wait=0ms service=2ms bytes=269 2011-05-19T00:34:34+00:00 heroku[router]: GET pxlc.heroku.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=4ms bytes=313 2011-05-19T00:34:34+00:00 app[web.1]: 97.83.58.74 - - [18/May/2011 17:34:34] "GET /favicon.ico HTTP/1.1" 404 18 0.0007 2011-05-18T18:35:48-07:00 heroku[web.1]: Idling 2011-05-18T18:35:51-07:00 heroku[web.1]: State changed from up to down

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• Triangulation A* (TA*) pathfinding algorithm

  - by hyn

  I need help understanding the Triangle A* (TA*) algorithm that is described by Demyen in his paper Efficient Triangulation-Based Pathfinding, on pages 76-81. He describes how to adapt the regular A* algorithm for triangulation, to search for other possibly more optimal paths, even after the final node is reached/expanded. Regular A* stops when the final node is expanded, but this is not always the best path when used in a triangulated graph. This is exactly the problem I'm having. The problem is illustrated on page 78, Figure 5.4: I understand how to calculate the g and h values presented in the paper (page 80). And I think the search stop condition is: if (currentNode.fCost > shortestDistanceFound) { // stop break; } where currentNode is the search node popped from the open list (priority queue), which has the lowest f-score. shortestDistanceFound is the actual distance of the shortest path found so far. But how do I exclude the previously found paths from future searches? Because if I do the search again, it will obviously find the same path. Do I reset the closed list? I need to modify something, but I don't know what it is I need to change. The paper lacks pseudocode, so that would be helpful.

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• SQLAuthority News – Learning, Community and Book Signing at #SQLPASS 2012

  - by pinaldave

  SQLPASS event is going excellent we are having great great fun! We are having book signing events and the response is overwhelmingly positive. I am glad that all of you love our books and I totally appreciate your support. Rick and I both are feeling very motivated to write more books in future. Here is our schedule for book signing. SQL Queries 2012 Joes 2 Pros Volume1 Finally a book for the true SQL Server beginner! Whether you are brand new to databases and are thinking of getting your 70-461 certification or already a semi-pro working in the field and need some fingertip support, this is this is the book for you. Joes 2 Pros does not assume you already know anything about databases or SQL server.  This book builds on the success of the previous series and will help anyone transform themselves from a beginner “Joe” into a SQL 2012 “Pro”. Wednesday, November 7, 2012 12pm-1pm – Book Signing at Exhibit Hall Joes Pros booth#117 (FREE BOOK) Rest all the time – I will be at Exhibition Hall Joes 2 Pros Booth #117. Stop by for the goodies! This book is also available on Amazon. SQL 2012 Functions Joes 2 Pros Functions have been around for many years to make our lives easier. Because of them, thousands of lines of valuable programming can be done with one statement. When we know what functions are offered in SQL Server we can get powerful projects done very quickly. Often times, the functions you wished you had are released in the next version. Wednesday, November 7, 2012 7pm-8pm - Embarcadero Booth Book Signing (FREE BOOK) Thursday, November 8, 2012 12pm-1pm - Embarcadero Booth Book Signing (FREE BOOK) This book is also available on Amazon. If you are at SQLPASS stop by Booth #117 – I will be there and many be you can get one of my signed book! Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL PASS, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority Book Review, SQLAuthority News, SQLServer, T SQL, Technology

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• DON'T MISS THE ORACLE LINUX GENERAL SESSION @ORACLE OPENWORLD

  - by Zeynep Koch

  We have had great sessions today at Openworld but tomorrow will be even better. The session that you should not miss is : Tuesday, Oct 2nd : General Session: Oracle Linux Strategy and Roadmap   10:15am, Moscone South #103   Wim Coekaerts, Sr.VP, Oracle Linux and Virtualization Engineering will talk about what Oracle Linux strategy and what is coming in the next 12 months. This is one session you should not miss and people are already registering. Stop by to hear Wim and ask questions about Linux development Top Technical Tips for Automatic and Secure Oracle Linux Deployments,  11:45am, Moscone South # 270 In this session, you will hear about deployment best practices and tips from Lenz Grimmer from Oracle and two Linux customers, Martin Breslin from SEI and Ed Bailey from Transunion talk about their experiences and insights Why Switch to Oracle Linux?, 3:30pm, Moscone South #270 In this session you will learn why Oracle Linux is best for your enterprise. There will be an Oracle speaker and Mike Radomski from SUNY talk about why they chose Oracle Linux. Please also visit the Oracle Linux Pavilion. If you stop by in one of our Partners booth you can be in the drawing for this beautiful, plush penguin. See you all tomorrow.

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• Clusterware 11gR2 &ndash; Setting up an Active/Passive failover configuration

  - by Gilles Haro

  Oracle is providing a large range of interesting solutions to ensure High Availability of the database. Dataguard, RAC or even both configurations (as recommended by Oracle for a Maximum Available Architecture - MAA) are the most frequently found and used solutions. But, when it comes to protecting a system with an Active/Passive architecture with failover capabilities, people often thinks to other expensive third party cluster systems. Oracle Clusterware technology, which comes along at no extra-cost with Oracle Database or Oracle Unbreakable Linux, is - in the knowing of most people - often linked to Oracle RAC and therefore, is seldom used to implement failover solutions. Oracle Clusterware 11gR2  (a part of Oracle 11gR2 Grid Infrastructure)  provides a comprehensive framework to setup automatic failover configurations. It is actually possible to make "failover-able'", and then to protect, almost any kind of application (from the simple xclock to the most complex Application Server). Quoting Oracle: “Oracle Clusterware is a portable cluster software that allows clustering of single servers so that they cooperate as a single system. Oracle Clusterware also provides the required infrastructure for Oracle Real Application Clusters (RAC). In addition Oracle Clusterware enables the protection of any Oracle application or any other kind of application within a cluster.” In the next couple of lines, I will try to present the different steps to achieve this goal : Have a fully operational 11gR2 database protected by automatic failover capabilities. I assume you are fluent in installing Oracle Database 11gR2, Oracle Grid Infrastructure 11gR2 on a Linux system and that ASM is not a problem for you (as I am using it as a shared storage). If not, please have a look at Oracle Documentation. As often, I made my tests using an Oracle VirtualBox environment. The scripts are tested and functional on my system. Unfortunately, there can always be a typo or a mistake. This blog entry does not replace a course around the Clusterware Framework. I just hope it will let you see how powerful it is and that it will give you the whilst to go further with it...  Note : This entry has been revised (rev.2) following comments from Philip Newlan. Prerequisite 2 Linux boxes (OELCluster01 and OELCluster02) at the same OS level. I used OEL 5 Update 5 with an Enterprise Kernel. Shared Storage (SAN). On my VirtualBox system, I used Openfiler to simulate the SAN Oracle 11gR2 Database (11.2.0.1) Oracle 11gR2 Grid Infrastructure (11.2.0.1)   Step 1 - Install the software Using asmlib, create 3 ASM disks (ASM_CRS, ASM_DTA and ASM_FRA) Install Grid Infrastructure for a cluster (OELCluster01 and OELCluster02 are the 2 nodes of the cluster) Use ASM_CRS to store Voting Disk and OCR. Use SCAN. Install Oracle Database Standalone binaries on both nodes. Use asmca to check/mount the disk groups on 2 nodes Use dbca to create and configure a database on the primary node Let's name it DB11G. Copy the pfile, password file to the second node. Create adump directoty on the second node.   Step 2 - Setup the resource to be protected After its creation with dbca, the database is automatically protected by the Oracle Restart technology available with Grid Infrastructure. Consequently, it restarts automatically (if possible) after a crash (ex: kill -9 smon). A database resource has been created for that in the Cluster Registry. We can observe this with the command : crsctl status resource that shows and ora.dba11g.db entry. Let's save the definition of this resource, for future use : mkdir -p /crs/11.2.0/HA_scripts chown oracle:oinstall /crs/11.2.0/HA_scripts crsctl status resource ora.db11g.db -p > /crs/11.2.0/HA_scripts/myResource.txt Although very interesting, Oracle Restart is not cluster aware and cannot restart the database on any other node of the cluster. So, let's remove it from the OCR definitions, we don't need it ! srvctl stop database -d DB11G srvctl remove database -d DB11G Instead of it, we need to create a new resource of a more general type : cluster_resource. Here are the steps to achieve this : Create an action script :  /crs/11.2.0/HA_scripts/my_ActivePassive_Cluster.sh #!/bin/bash export ORACLE_HOME=/oracle/product/11.2.0/dbhome_1 export ORACLE_SID=DB11G case $1 in 'start')   $ORACLE_HOME/bin/sqlplus /nolog <<EOF   connect / as sysdba   startup EOF   RET=0   ;; 'stop')   $ORACLE_HOME/bin/sqlplus /nolog <<EOF   connect / as sysdba   shutdown immediate EOF   RET=0   ;; 'clean')   $ORACLE_HOME/bin/sqlplus /nolog <<EOF   connect / as sysdba   shutdown abort    ##for i in `ps -ef | grep -i $ORACLE_SID | awk '{print $2}' ` ;do kill -9 $i; done EOF   RET=0   ;; 'check')    ok=`ps -ef | grep smon | grep $ORACLE_SID | wc -l`    if [ $ok = 0 ]; then      RET=1    else      RET=0    fi    ;; '*')      RET=0   ;; esac if [ $RET -eq 0 ]; then    exit 0 else    exit 1 fi   This script must provide, at least, methods to start, stop, clean and check the database. It is self-explaining and contains nothing special. Just be aware that it must be runnable (+x), it runs as Oracle user (because of the ACL property - see later) and needs to know about the environment. Also make sure it exists on every node of the cluster. Moreover, as of 11.2, the clean method is mandatory. It must provide the “last gasp clean up”, for example, a shutdown abort or a kill –9 of all the remaining processes. chmod +x /crs/11.2.0/HA_scripts/my_ActivePassive_Cluster.sh scp  /crs/11.2.0/HA_scripts/my_ActivePassive_Cluster.sh   oracle@OELCluster02:/crs/11.2.0/HA_scripts Create a new resource file, based on the information we got from previous  myResource.txt . Name it myNewResource.txt. myResource.txt  is shown below. As we can see, it defines an ora.database.type resource, named ora.db11g.db. A lot of properties are related to this type of resource and do not need to be used for a cluster_resource. NAME=ora.db11g.db TYPE=ora.database.type ACL=owner:oracle:rwx,pgrp:oinstall:rwx,other::r-- ACTION_FAILURE_TEMPLATE= ACTION_SCRIPT= ACTIVE_PLACEMENT=1 AGENT_FILENAME=%CRS_HOME%/bin/oraagent%CRS_EXE_SUFFIX% AUTO_START=restore CARDINALITY=1 CHECK_INTERVAL=1 CHECK_TIMEOUT=600 CLUSTER_DATABASE=false DB_UNIQUE_NAME=DB11G DEFAULT_TEMPLATE=PROPERTY(RESOURCE_CLASS=database) PROPERTY(DB_UNIQUE_NAME= CONCAT(PARSE(%NAME%, ., 2), %USR_ORA_DOMAIN%, .)) ELEMENT(INSTANCE_NAME= %GEN_USR_ORA_INST_NAME%) DEGREE=1 DESCRIPTION=Oracle Database resource ENABLED=1 FAILOVER_DELAY=0 FAILURE_INTERVAL=60 FAILURE_THRESHOLD=1 GEN_AUDIT_FILE_DEST=/oracle/admin/DB11G/adump GEN_USR_ORA_INST_NAME= GEN_USR_ORA_INST_NAME@SERVERNAME(oelcluster01)=DB11G HOSTING_MEMBERS= INSTANCE_FAILOVER=0 LOAD=1 LOGGING_LEVEL=1 MANAGEMENT_POLICY=AUTOMATIC NLS_LANG= NOT_RESTARTING_TEMPLATE= OFFLINE_CHECK_INTERVAL=0 ORACLE_HOME=/oracle/product/11.2.0/dbhome_1 PLACEMENT=restricted PROFILE_CHANGE_TEMPLATE= RESTART_ATTEMPTS=2 ROLE=PRIMARY SCRIPT_TIMEOUT=60 SERVER_POOLS=ora.DB11G SPFILE=+DTA/DB11G/spfileDB11G.ora START_DEPENDENCIES=hard(ora.DTA.dg,ora.FRA.dg) weak(type:ora.listener.type,uniform:ora.ons,uniform:ora.eons) pullup(ora.DTA.dg,ora.FRA.dg) START_TIMEOUT=600 STATE_CHANGE_TEMPLATE= STOP_DEPENDENCIES=hard(intermediate:ora.asm,shutdown:ora.DTA.dg,shutdown:ora.FRA.dg) STOP_TIMEOUT=600 UPTIME_THRESHOLD=1h USR_ORA_DB_NAME=DB11G USR_ORA_DOMAIN=haroland USR_ORA_ENV= USR_ORA_FLAGS= USR_ORA_INST_NAME=DB11G USR_ORA_OPEN_MODE=open USR_ORA_OPI=false USR_ORA_STOP_MODE=immediate VERSION=11.2.0.1.0 I removed database type related entries from myResource.txt and modified some other to produce the following myNewResource.txt. Notice the NAME property that should not have the ora. prefix Notice the TYPE property that is not ora.database.type but cluster_resource. Notice the definition of ACTION_SCRIPT. Notice the HOSTING_MEMBERS that enumerates the members of the cluster (as returned by the olsnodes command). NAME=DB11G.db TYPE=cluster_resource DESCRIPTION=Oracle Database resource ACL=owner:oracle:rwx,pgrp:oinstall:rwx,other::r-- ACTION_SCRIPT=/crs/11.2.0/HA_scripts/my_ActivePassive_Cluster.sh PLACEMENT=restricted ACTIVE_PLACEMENT=0 AUTO_START=restore CARDINALITY=1 CHECK_INTERVAL=10 DEGREE=1 ENABLED=1 HOSTING_MEMBERS=oelcluster01 oelcluster02 LOGGING_LEVEL=1 RESTART_ATTEMPTS=1 START_DEPENDENCIES=hard(ora.DTA.dg,ora.FRA.dg) weak(type:ora.listener.type,uniform:ora.ons,uniform:ora.eons) pullup(ora.DTA.dg,ora.FRA.dg) START_TIMEOUT=600 STOP_DEPENDENCIES=hard(intermediate:ora.asm,shutdown:ora.DTA.dg,shutdown:ora.FRA.dg) STOP_TIMEOUT=600 UPTIME_THRESHOLD=1h Register the resource. Take care of the resource type. It needs to be a cluster_resource and not a ora.database.type resource (Oracle recommendation) .   crsctl add resource DB11G.db  -type cluster_resource -file /crs/11.2.0/HA_scripts/myNewResource.txt Step 3 - Start the resource crsctl start resource DB11G.db This command launches the ACTION_SCRIPT with a start and a check parameter on the primary node of the cluster. Step 4 - Test this We will test the setup using 2 methods. crsctl relocate resource DB11G.db This command calls the ACTION_SCRIPT  (on the two nodes)  to stop the database on the active node and start it on the other node. Once done, we can revert back to the original node, but, this time we can use a more "MS$ like" method :Turn off the server on which the database is running. After short delay, you should observe that the database is relocated on node 1. Conclusion Once the software installed and the standalone database created (which is a rather common and usual task), the steps to reach the objective are quite easy : Create an executable action script on every node of the cluster. Create a resource file. Create/Register the resource with OCR using the resource file. Start the resource. This solution is a very interesting alternative to licensable third party solutions. References Clusterware 11gR2 documentation Oracle Clusterware Resource Reference Clusterware for Unbreakable Linux Using Oracle Clusterware to Protect A Single Instance Oracle Database 11gR1 (to have an idea of complexity) Oracle Clusterware on OTN   Gilles Haro Technical Expert - Core Technology, Oracle Consulting   

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• MySql #2002 problem

  - by Systeem Faillure

  when i try to login in apache i get #2002 error. when i try to login via terminal it ask my password mysql -u root and i get ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) i tried to remove mysql and install it again and nothing happen ( i cant even remove it) i try to reboot apache but still nothing. i tried to reboot my pc and of course still aint working. in terminal i put sudo start mysql i got this: start: Job failed to start mysql -ubob -hlocalhost -P3306 -p got me this ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) sudo service mysql stop gave me this stop: Unknown instance: my.cnf * Basic Settings # user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp lc-messages-dir = /usr/share/mysql skip-external-locking # i tried to find if there is a file in my /var/run/mysqld/ or in /var/tmp/ and dint find the file mysqld.sock .. i looked in /var/log/mysql/ and dont even have anything in it can help me???i try to find help on google for hours and dint help at all... -------EDIT---------- salem : sudo service mysql start i get start: Job failed to start cat /var/log/syslog | grep mysql here http://paste.ubuntu.com/1335984/ /var/run/mysqld/ this folder exist but it dosent have anything in it /var/run/mysqld/ i get total 0 drwxr-xr-x 2 mysql root 40 Nov 5 22:31 . drwxr-xr-x 25 root root 860 Nov 5 22:32 .. sorry that i post anything my terminal gives but i am noob at this. hope this information will do.

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• Drawing particles with CPU instead of GPU (XNA)

  - by Helix

  I'm trying out modifications to the following particle system. http://create.msdn.com/en-US/education/catalog/sample/particle_3d I have a function such that when I press Space, all the particles have their positions and velocities set to 0. for (int i = 0; i < particles.GetLength(0); i++) { particles[i].Position = Vector3.Zero; particles[i].Velocity = Vector3.Zero; } However, when I press space, the particles are still moving. If I go to FireParticleSystem.cs I can turn settings.Gravity to 0 and the particles stop moving, but the particles are still not being shifted to (0,0,0). As I understand it, the problem lies in the fact that the GPU is processing all the particle positions, and it's calculating where the particles should be based on their initial position, their initial velocity and multiplying by their age. Therefore, all I've been able to do is change the initial position and velocity of particles, but I'm unable to do it on the fly since the GPU is handling everything. I want the CPU to calculate the positions of the particles individually. This is because I will be later implementing some sort of wind to push the particles around. How do I stop the GPU from taking over? I think it's something to do with VertexBuffers and the draw function, but I don't know how to modify it to make it work.

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• How to get a Sun Ray to load a firmware from elsewhere

  - by vdiozguy

  I run a Sun Ray/VDI demo environment internally within the company - and because it's not a public service, I need to tell my Sun Rays to connect to it directly so that I don't get redirected to the corporate servers. To get any new Sun Ray to connect to *my* setup I usually pull out my laptop so that the Sun Ray can load the new version of the F/W along with the permission to pull up the management GUI via STOP-S.But there is a better way if you have another Sun Ray server handy:1) allow your Sun Ray to connect to the default corporate server2) log in to a "regular" session, that is a Solaris or Linux desktop on the Sun Ray server itself3) in a terminal, utswitch to your server (/opt/SUNWut/bin/utswitch -h myserver)4) again, login to a regular session there5) in a terminal,  issue "/opt/SUNWut/lib/utload -S myserver -w"6) Watch your firmware load and wait7) the Sun Ray will reboot and connect to the first server again. Repeat steps 2-48) issue "/opt/SUNWut/lib/utload -S myserver -f SunRay.enableGUI"9) Press STOP-S and be merryNOTE: I'm sure there is even yet a better way - this is totally unsupported, most likely a figment of my imagination. In any case, this post will self-destruct in BOOM.

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• How to fix sudo: setreuid(ROOT_UID, user_uid): Operation not permitted error?

  - by David R.

  I am using LDAP authentication on my Ubuntu 11.10 server. I installed libpam-ldap, and configured things accordingly. It works great, except that I get this error every once in a while when I try to sudo: sudo: setreuid(ROOT_UID, user_uid): Operation not permitted I know I have sudoers set up correctly, since it works most of the time. It's not just my log in either, others have the same problem when I have it. When this error is occurring, I can't ssh in with my regular system user at all. When I sign in directly, I can't get any gnome-terminal to start. Once I restart the server, the problem goes away. 'Course, that's not a solution, if it was a prod server, I'd be in trouble. How do I fix this? Edit 3/1/12: I just figured out that if stop and start the nscd service, the problem goes away. service nscd stop service nscd start Not much of a solution since I have to be logged into the server directly, not via ssh.

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• apache2 is making my amazon ec2 unavailable, any ideas?

  - by Tim

  I have a web server running on a EC2 c1.medium intance. The instance is running on ubuntu, with apache2 and mysql.The ubuntu and apache version are the next; Ubuntu DISTRIB_ID=Ubuntu DISTRIB_RELEASE=11.04 DISTRIB_CODENAME=natty DISTRIB_DESCRIPTION="Ubuntu 11.04" Apache2 Server version: Apache/2.2.17 (Ubuntu) Server built: Feb 22 2011 18:33:02 Sometimes randomly, my server "hangs up", I cannot connect to it using normal web access or ssh access. If I reboot the instance it reboots fine, the amazon system log doesn't show anything weird, but the problem persists The only way to solve it its stopping the instance, and start it again. I think that the problem its has something to do with apache, because the last lines of the error log lists: normal errors [Sun Jun 19 06:25:09 2011] [notice] Apache/2.2.17 (Ubuntu) PHP/5.3.5-1ubuntu7.2 with Suhosin-Patch configured -- resuming normal operations nobody cant connetc... no more erros until i stop and start the instance normal errors [Wed Jun 22 14:21:18 2011] [notice] Apache/2.2.17 (Ubuntu) PHP/5.3.5-1ubuntu7.2 with Suhosin-Patch configured -- resuming normal operations nobody cant connetc... no more erros until i stop and start the instance Can somebody please help me?

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• MOSS Search Error: Authentication failed because the remote party has closed the transport stream

  - by Cherie Riesberg

  http://support.microsoft.com/?id=962928 To resolve this issue, follow these steps: Stop the Office SharePoint Services Search service. To do this, follow these steps: Click Start, click Run, type cmd , and then click OK. At the command prompt, type net stop osearch, and then press ENTER. Type exit to exit the command prompt. Download and install the IIS 6.0 Resource Kit Tools. To obtain the IIS 6.0 Resource Kit Tools, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?familyid=56FC92EE-A71A-4C73-B628-ADE629C89499 (http://www.microsoft.com/downloads/details.aspx?familyid=56FC92EE-A71A-4C73-B628-ADE629C89499) On each server in the farm that has Office SharePoint 2007 installed, follow these steps: Click Start, click Run, type cmd , and then click OK. Navigate to the location of the IIS 6.0 Resource Kit Tools (default location is: C:\Program Files\IIS Resources\SelfSSL) At the command prompt, type selfssl /s:951338967 /v:1000, and then press ENTER. Notes For 64 bit Server, 951338967 is the default ID of the Office Server Web Services certificate. For 32 bit Server, 1720207907 is the default ID of the Office Server Web Services certificate. You can check the ID of Office Server Web Services from IIS. 1000 is the number of days that the certification will be valid. You need to execute the selfssl command on each MOSS Server in the farm which is running a "Office Server Web Services" site. SharePoint partly uses SSL name resolution in the background between farm servers, which users generally do not need to be aware of. Start the Office SharePoint Services Search service. To do this, follow these steps: At the command prompt, type net start osearch, and then press ENTER. Type exit to exit the command prompt. Download and install the following update to the .NET Framework 3.5 SP1. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 959209  (http://support.microsoft.com/kb/959209/ ) An update for the .NET Framework 3.5 Service Pack 1 is available

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• The Raspberry Pi Now Has Its Own App Store

  - by Jason Fitzpatrick

  Raspberry Pi, the credit-card sized computer with an ARM processor, now has its own appstore where Raspberry Pi hobbyists and developers can share their creations in a one-stop location accessible to all Raspberry Pi users. In today’s press release about the store, the Raspberry Pi Foundation writes: We’ve been amazed by the variety of software that people have written for, or ported to, the Raspberry Pi. Today, together with our friends at IndieCity and Velocix, we’re launching the Pi Store to make it easier for developers of all ages to share their games, applications, tools and tutorials with the rest of the community. The Pi Store will, we hope, become a one-stop shop for all your Raspberry Pi needs; it’s also an easier way into the Raspberry Pi experience for total beginners, who will find everything they need to get going in one place, for free. The store runs as an X application under Raspbian, and allows users to download content, and to upload their own content for moderation and release. At launch, we have 23 free titles in the store, ranging from utilities like LibreOffice and Asterisk to classic games like Freeciv and OpenTTD and Raspberry Pi exclusive Iridium Rising. We also have one piece of commercial content: the excellent Storm in a Teacup from Cobra Mobile. For more information about the store, including how to install the app store on your Pi, check out the full press release here. To get started browsing the store, hit up the link below. Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• mediatomb fails with "respawning too fast, stopped"

  - by felix

  When I try to start mediatomb it fails. I see this in dmesg [...] [916349.374331] init: mediatomb main process ended, respawning [916349.394462] init: mediatomb main process (880) terminated with status 1 [916349.394512] init: mediatomb main process ended, respawning [916349.414598] init: mediatomb main process (882) terminated with status 1 [916349.414647] init: mediatomb respawning too fast, stopped My current /etc/init/mediatomb.conf looks like this. description "MediaTomb UPnP media server" author "Daniel van Vugt <vanvugt in launchpad>" start on (local-filesystems and net-device-up IFACE!=lo) stop on runlevel [!2345] respawn env CONFIGXML=/etc/mediatomb/config.xml env LOGFILE=/var/log/mediatomb.log env DEFAULT=/etc/default/mediatomb script [ -r $DEFAULT ] && . $DEFAULT [ ! $USER ] && USER=root [ ! $GROUP ] && GROUP=$USER if [ -n "$INTERFACE" ]; then INTERFACE_ARG="-e $INTERFACE" $ROUTE_ADD $INTERFACE fi exec mediatomb \ -c $CONFIGXML \ -u $USER \ -g $GROUP \ -l $LOGFILE \ $INTERFACE_ARG \ $OPTIONS end script post-stop script [ -r $DEFAULT ] && . $DEFAULT if [ -n "$INTERFACE" ]; then $ROUTE_DEL $INTERFACE fi end script

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• Clusterware 11gR2 &ndash; Setting up an Active/Passive failover configuration

  - by Gilles Haro

  Oracle provides many interesting ways to ensure High Availability. Dataguard configurations, RAC configurations or even both (as recommended for a Maximum Available Architecture - MAA) are the most frequently found. But when it comes to protecting a system with an Active/Passive architecture with failover capabilities, one often thinks to expensive third party cluster systems. Oracle Clusterware technology, which comes free with Oracle Database, is – in the knowing of most people - often linked to Oracle RAC and therefore, is rarely used to implement failover solutions. 11gR2 Clusterware – which is part of Oracle Grid Infrastructure - provides a comprehensive framework to setup automatic failover configurations. It is actually possible to make “failover-able'” and, therefore to protect, almost every kind of application (from xclock to the more complex Application Server) In the next couple of lines, I will try to present the different steps to achieve this goal : Have a fully operational 11gR2 database protected by automatic failover capabilities. I assume you are fluent in installing Oracle Database 11gR2, Oracle Grid Infrastructure 11gR2 on a Linux system and that ASM is not a problem for you (as I am using it as a shared storage). If not, please have a look at Oracle Documentation. As often, I made my tests using an Oracle VirtualBox environment. The scripts are tested and functional. Unfortunately, there can always be a typo or a mistake. This blog entry is not a course around the Clusterware Framework. I just hope it will let you see how powerful it is and that it will give you the whilst to go further with it…   Prerequisite 2 Linux boxes (OELCluster01 and OELCluster02) at the same OS level. I used OEL 5 Update 5 with Enterprise Kernel. Shared Storage (SAN). On my VirtualBox system, I used Openfiler to simulate the SAN Oracle 11gR2 Database (11.2.0.1) Oracle 11gR2 Grid Infrastructure (11.2.0.1)   Step 1 – Install the software Using asmlib, create 3 ASM disks (ASM_CRS, ASM_DTA and ASM_FRA) Install Grid Infrastructure for a cluster (OELCluster01 and OELCluster02 are the 2 nodes of the cluster) Use ASM_CRS to store Voting Disk and OCR. Use SCAN. Install Oracle Database Standalone binaries on both nodes. Use asmca to check/mount the disk groups on 2 nodes Use dbca to create and configure a database on the primary node Let’s name it DB11G. Copy the pfile, password file to the second node. Create adump directoty on the second node.   Step 2 - Setup the resource to be protected After its creation with dbca, the database is automatically protected by the Oracle Restart technology available with Grid Infrastructure. Consequently, it restarts automatically (if possible) after a crash (ex: kill –9 smon). A database resource has been created for that in the Cluster Registry. We can observe this with the command : crsctl status resource that shows and ora.dba11g.db entry. Let’s save the definition of this resource, for future use : mkdir –p /crs/11.2.0/HA_scripts chown oracle:oinstall /crs/11.2.0/HA_scripts crsctl status resource ora.db11g.db -p > /crs/11.2.0/HA_scripts/myResource.txt Although very interesting, Oracle Restart is not cluster aware and cannot restart the database on any other node of the cluster. So, let’s remove it from the OCR definitions, we don’t need it ! srvctl stop database -d DB11G srvctl remove database -d DB11G Instead of it, we need to create a new resource of a more general type : cluster_resource. Here are the steps to achieve this : Create an action script :  /crs/11.2.0/HA_scripts/my_ActivePassive_Cluster.sh #!/bin/bash export ORACLE_HOME=/oracle/product/11.2.0/dbhome_1 export ORACLE_SID=DB11G case $1 in 'start')   $ORACLE_HOME/bin/sqlplus /nolog <<EOF   connect / as sysdba   startup EOF   RET=0   ;; 'stop')   $ORACLE_HOME/bin/sqlplus /nolog <<EOF   connect / as sysdba   shutdown immediate EOF   RET=0   ;; 'check')    ok=`ps -ef | grep smon | grep $ORACLE_SID | wc -l`    if [ $ok = 0 ]; then      RET=1    else      RET=0    fi    ;; '*')      RET=0   ;; esac if [ $RET -eq 0 ]; then    exit 0 else    exit 1 fi   This script must provide, at least, methods to start, stop and check the database. It is self-explaining and contains nothing special. Just be aware that it is run as Oracle user (because of the ACL property – see later) and needs to know about the environment. It also needs to be present on every node of the cluster. chmod +x /crs/11.2.0/HA_scripts/my_ActivePassive_Cluster.sh scp  /crs/11.2.0/HA_scripts/my_ActivePassive_Cluster.sh   oracle@OELCluster02:/crs/11.2.0/HA_scripts Create a new resource file, based on the information we got from previous  myResource.txt . Name it myNewResource.txt. myResource.txt  is shown below. As we can see, it defines an ora.database.type resource, named ora.db11g.db. A lot of properties are related to this type of resource and do not need to be used for a cluster_resource. NAME=ora.db11g.db TYPE=ora.database.type ACL=owner:oracle:rwx,pgrp:oinstall:rwx,other::r-- ACTION_FAILURE_TEMPLATE= ACTION_SCRIPT= ACTIVE_PLACEMENT=1 AGENT_FILENAME=%CRS_HOME%/bin/oraagent%CRS_EXE_SUFFIX% AUTO_START=restore CARDINALITY=1 CHECK_INTERVAL=1 CHECK_TIMEOUT=600 CLUSTER_DATABASE=false DB_UNIQUE_NAME=DB11G DEFAULT_TEMPLATE=PROPERTY(RESOURCE_CLASS=database) PROPERTY(DB_UNIQUE_NAME= CONCAT(PARSE(%NAME%, ., 2), %USR_ORA_DOMAIN%, .)) ELEMENT(INSTANCE_NAME= %GEN_USR_ORA_INST_NAME%) DEGREE=1 DESCRIPTION=Oracle Database resource ENABLED=1 FAILOVER_DELAY=0 FAILURE_INTERVAL=60 FAILURE_THRESHOLD=1 GEN_AUDIT_FILE_DEST=/oracle/admin/DB11G/adump GEN_USR_ORA_INST_NAME= GEN_USR_ORA_INST_NAME@SERVERNAME(oelcluster01)=DB11G HOSTING_MEMBERS= INSTANCE_FAILOVER=0 LOAD=1 LOGGING_LEVEL=1 MANAGEMENT_POLICY=AUTOMATIC NLS_LANG= NOT_RESTARTING_TEMPLATE= OFFLINE_CHECK_INTERVAL=0 ORACLE_HOME=/oracle/product/11.2.0/dbhome_1 PLACEMENT=restricted PROFILE_CHANGE_TEMPLATE= RESTART_ATTEMPTS=2 ROLE=PRIMARY SCRIPT_TIMEOUT=60 SERVER_POOLS=ora.DB11G SPFILE=+DTA/DB11G/spfileDB11G.ora START_DEPENDENCIES=hard(ora.DTA.dg,ora.FRA.dg) weak(type:ora.listener.type,uniform:ora.ons,uniform:ora.eons) pullup(ora.DTA.dg,ora.FRA.dg) START_TIMEOUT=600 STATE_CHANGE_TEMPLATE= STOP_DEPENDENCIES=hard(intermediate:ora.asm,shutdown:ora.DTA.dg,shutdown:ora.FRA.dg) STOP_TIMEOUT=600 UPTIME_THRESHOLD=1h USR_ORA_DB_NAME=DB11G USR_ORA_DOMAIN=haroland USR_ORA_ENV= USR_ORA_FLAGS= USR_ORA_INST_NAME=DB11G USR_ORA_OPEN_MODE=open USR_ORA_OPI=false USR_ORA_STOP_MODE=immediate VERSION=11.2.0.1.0 I removed database type related entries from myResource.txt and modified some other to produce the following myNewResource.txt. Notice the NAME property that should not have the ora. prefix Notice the TYPE property that is not ora.database.type but cluster_resource. Notice the definition of ACTION_SCRIPT. Notice the HOSTING_MEMBERS that enumerates the members of the cluster (as returned by the olsnodes command). NAME=DB11G.db TYPE=cluster_resource DESCRIPTION=Oracle Database resource ACL=owner:oracle:rwx,pgrp:oinstall:rwx,other::r-- ACTION_SCRIPT=/crs/11.2.0/HA_scripts/my_ActivePassive_Cluster.sh PLACEMENT=restricted ACTIVE_PLACEMENT=0 AUTO_START=restore CARDINALITY=1 CHECK_INTERVAL=10 DEGREE=1 ENABLED=1 HOSTING_MEMBERS=oelcluster01 oelcluster02 LOGGING_LEVEL=1 RESTART_ATTEMPTS=1 START_DEPENDENCIES=hard(ora.DTA.dg,ora.FRA.dg) weak(type:ora.listener.type,uniform:ora.ons,uniform:ora.eons) pullup(ora.DTA.dg,ora.FRA.dg) START_TIMEOUT=600 STOP_DEPENDENCIES=hard(intermediate:ora.asm,shutdown:ora.DTA.dg,shutdown:ora.FRA.dg) STOP_TIMEOUT=600 UPTIME_THRESHOLD=1h Register the resource. Take care of the resource type. It needs to be a cluster_resource and not a ora.database.type resource (Oracle recommendation) .   crsctl add resource DB11G.db  -type cluster_resource -file /crs/11.2.0/HA_scripts/myNewResource.txt Step 3 - Start the resource crsctl start resource DB11G.db This command launches the ACTION_SCRIPT with a start and a check parameter on the primary node of the cluster. Step 4 - Test this We will test the setup using 2 methods. crsctl relocate resource DB11G.db This command calls the ACTION_SCRIPT  (on the two nodes)  to stop the database on the active node and start it on the other node. Once done, we can revert back to the original node, but, this time we can use a more “MS$ like” method :Turn off the server on which the database is running. After short delay, you should observe that the database is relocated on node 1. Conclusion Once the software installed and the standalone database created (which is a rather common and usual task), the steps to reach the objective are quite easy : Create an executable action script on every node of the cluster. Create a resource file. Create/Register the resource with OCR using the resource file. Start the resource. This solution is a very interesting alternative to licensable third party solutions.   References Clusterware 11gR2 documentation Oracle Clusterware Resource Reference   Gilles Haro Technical Expert - Core Technology, Oracle Consulting   

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• Fight for your rights as a video gamer.

  - by Chris Williams

  Soon, the U.S. Supreme Court may decide whether to hear a case that could have a lasting impact on computer and video games. The case before the Court involves a law passed by the state of California attempting to criminalize the sale of certain computer and video games. Two previous courts rejected the California law as unconstitutional, but soon the Supreme Court could have the final say. Whatever the Court's ruling, we must be prepared to continue defending our rights now and in the future. To do so, we need a large, powerful movement of gamers to speak with one voice and show that we won't sit back while lawmakers try to score political points by scapegoating video games and treating them differently than books, movies, and music. If the Court decides to hear the case, we're going to need thousands of activists like you who can help defend computer and video games by writing letters to editors, calling into talk radio stations, and educating Americans about our passion for and appreciation of computer and video games. You can help build this movement right now by inviting all your friends and fellow gamers to join the Video Game Voters Network. Use our simple tool to send an email to everyone you know asking them to stand up for gaming rights: http://videogamevoters.org/movement You can also help spread the word through Facebook and Twitter, or you can simply forward this email to everyone you know and ask them to sign up at videogamevoters.org. Time after time, courts continue to reject politicians' efforts to restrict the sale of computer and video games. But that doesn't mean the politicians will stop trying anytime soon -- in fact, it means they're likely to ramp up their efforts even more. To stop them, we must make it clear that gamers will continue to stand up for free speech -- and that the numbers are on our side. Help make sure we're ready and able to keep fighting for our gaming rights. Spread the word about the Video Game Voters Network right now: http://videogamevoters.org/movement Thank you. -- Video Game Voters Network

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• SQLAuthority News – #SQLPASS 2012 Schedule – Where can You Find Me

  - by pinaldave

  Yesterday I wrote about my memory lane with SQLPASS. It has been a fantastic experience and I am very confident that this year the same excellent experience is going to be repeated. Before I start for #SQLPASS every year, I plan where I want to be and what I will be doing. As I travel from India to attend this event (22+ hours flying time and door to door travel time around 36 hours), it is very crucial that I plan things in advance. This year here is my quick note where I will be during the SQLPASS event. If you can stop with me, I would like to meet you, shake your hand and will archive memories as a photograph. Tuesday, November 6, 2012 6:30pm-8:00pm PASS Summit 2012 Welcome Reception Wednesday, November 7, 2012 12pm-1pm – Book Signing at Exhibit Hall Joes Pros booth#117 (FREE BOOK) 5:30pm-6:30pm – Idera Reception at Fox Sports Grill 7pm-8pm - Embarcadero Booth Book Signing (FREE BOOK) 8pm onwards – Exhibitor Reception Thursday, November 8, 2012 12pm-1pm - Embarcadero Booth Book Signing (FREE BOOK) 7pm-10pm - Community Appreciation Party Friday, November 9, 2012 12pm-1pm - Joes 2 Pros Book Signing at Exhibit Hall Joes Pros booth#117 11:30pm-1pm - Birds of a Feather Luncheon Rest of the Time! Exhibition Hall Joes 2 Pros Booth #117. Stop by for the goodies! Lots of people have already sent me email asking if we can meet for a cup of coffee to discuss SQL. Absolutely! I like cafe mocha with skim milk and whip cream and I do not get tired of it. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL PASS, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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• DHCP server not starting

  - by Bruce

  I'm trying to set a DHCP server on 12.04. I installed: sudo apt-get install isc-dhcp-server My configuration files look like this: /etc/default/isc-dhcp-server INTERFACES="eth0" /etc/network/interfaces auto lo iface lo inet loopback /etc/dhcp/dhcpd.conf ddns-update-style none; default-lease-time 600; max-lease-time 7200; authoritative; log-facility local7; subnet 192.168.1.0 netmask 255.255.255.0 { range 192.168.1.235 192.168.1.240; option subnet-mask 255.255.255.0; option broadcast-address 192.168.1.255; option routers 192.168.1.1; default-lease-time 100000; max-lease-time 100000; } When I run sudo service isc-dhcp-server restart I get: stop: Unknown instance: isc-dhcp-server start/running, process 15384 After this if I run sudo service isc-dhcp-server status it shows that its stopped: isc-dhcp-server stop/waiting What am I doing wrong here?

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• Applications: The mathematics of movement, Part 1

  - by TechTwaddle

  Before you continue reading this post, a suggestion; if you haven’t read “Programming Windows Phone 7 Series” by Charles Petzold, go read it. Now. If you find 150+ pages a little too long, at least go through Chapter 5, Principles of Movement, especially the section “A Brief Review of Vectors”. This post is largely inspired from this chapter. At this point I assume you know what vectors are, how they are represented using the pair (x, y), what a unit vector is, and given a vector how you would normalize the vector to get a unit vector. Our task in this post is simple, a marble is drawn at a point on the screen, the user clicks at a random point on the device, say (destX, destY), and our program makes the marble move towards that point and stop when it is reached. The tricky part of this task is the word “towards”, it adds a direction to our problem. Making a marble bounce around the screen is simple, all you have to do is keep incrementing the X and Y co-ordinates by a certain amount and handle the boundary conditions. Here, however, we need to find out exactly how to increment the X and Y values, so that the marble appears to move towards the point where the user clicked. And this is where vectors can be so helpful. The code I’ll show you here is not ideal, we’ll be working with C# on Windows Mobile 6.x, so there is no built-in vector class that I can use, though I could have written one and done all the math inside the class. I think it is trivial to the actual problem that we are trying to solve and can be done pretty easily once you know what’s going on behind the scenes. In other words, this is an excuse for me being lazy. The first approach, uses the function Atan2() to solve the “towards” part of the problem. Atan2() takes a point (x, y) as input, Atan2(y, x), note that y goes first, and then it returns an angle in radians. What angle you ask. Imagine a line from the origin (0, 0), to the point (x, y). The angle which Atan2 returns is the angle the positive X-axis makes with that line, measured clockwise. The figure below makes it clear, wiki has good details about Atan2(), give it a read. The pair (x, y) also denotes a vector. A vector whose magnitude is the length of that line, which is Sqrt(x*x + y*y), and a direction ?, as measured from positive X axis clockwise. If you’ve read that chapter from Charles Petzold’s book, this much should be clear. Now Sine and Cosine of the angle ? are special. Cosine(?) divides x by the vectors length (adjacent by hypotenuse), thus giving us a unit vector along the X direction. And Sine(?) divides y by the vectors length (opposite by hypotenuse), thus giving us a unit vector along the Y direction. Therefore the vector represented by the pair (cos(?), sin(?)), is the unit vector (or normalization) of the vector (x, y). This unit vector has a length of 1 (remember sin2(?) + cos2(?) = 1 ?), and a direction which is the same as vector (x, y). Now if I multiply this unit vector by some amount, then I will always get a point which is a certain distance away from the origin, but, more importantly, the point will always be on that line. For example, if I multiply the unit vector with the length of the line, I get the point (x, y). Thus, all we have to do to move the marble towards our destination point, is to multiply the unit vector by a certain amount each time and draw the marble, and the marble will magically move towards the click point. Now time for some code. The application, uses a timer based frame draw method to draw the marble on the screen. The timer is disabled initially and whenever the user clicks on the screen, the timer is enabled. The callback function for the timer follows the standard Update and Draw cycle. private double totLenToTravelSqrd = 0; private double startPosX = 0, startPosY = 0; private double destX = 0, destY = 0; private void Form1_MouseUp(object sender, MouseEventArgs e) {     destX = e.X;     destY = e.Y;     double x = marble1.x - destX;     double y = marble1.y - destY;     //calculate the total length to be travelled     totLenToTravelSqrd = x * x + y * y;     //store the start position of the marble     startPosX = marble1.x;     startPosY = marble1.y;     timer1.Enabled = true; } private void timer1_Tick(object sender, EventArgs e) {     UpdatePosition();     DrawMarble(); } Form1_MouseUp() method is called when ever the user touches and releases the screen. In this function we save the click point in destX and destY, this is the destination point for the marble and we also enable the timer. We store a few more values which we will use in the UpdatePosition() method to detect when the marble has reached the destination and stop the timer. So we store the start position of the marble and the square of the total length to be travelled. I’ll leave out the term ‘sqrd’ when speaking of lengths from now on. The time out interval of the timer is set to 40ms, thus giving us a frame rate of about ~25fps. In the timer callback, we update the marble position and draw the marble. We know what DrawMarble() does, so here, we’ll only look at how UpdatePosition() is implemented; private void UpdatePosition() {     //the vector (x, y)     double x = destX - marble1.x;     double y = destY - marble1.y;     double incrX=0, incrY=0;     double distanceSqrd=0;     double speed = 6;     //distance between destination and current position, before updating marble position     distanceSqrd = x * x + y * y;     double angle = Math.Atan2(y, x);     //Cos and Sin give us the unit vector, 6 is the value we use to magnify the unit vector along the same direction     incrX = speed * Math.Cos(angle);     incrY = speed * Math.Sin(angle);     marble1.x += incrX;     marble1.y += incrY;     //check for bounds     if ((int)marble1.x < MinX + marbleWidth / 2)     {         marble1.x = MinX + marbleWidth / 2;     }     else if ((int)marble1.x > (MaxX - marbleWidth / 2))     {         marble1.x = MaxX - marbleWidth / 2;     }     if ((int)marble1.y < MinY + marbleHeight / 2)     {         marble1.y = MinY + marbleHeight / 2;     }     else if ((int)marble1.y > (MaxY - marbleHeight / 2))     {         marble1.y = MaxY - marbleHeight / 2;     }     //distance between destination and current point, after updating marble position     x = destX - marble1.x;     y = destY - marble1.y;     double newDistanceSqrd = x * x + y * y;     //length from start point to current marble position     x = startPosX - (marble1.x);     y = startPosY - (marble1.y);     double lenTraveledSqrd = x * x + y * y;     //check for end conditions     if ((int)lenTraveledSqrd >= (int)totLenToTravelSqrd)     {         System.Console.WriteLine("Stopping because destination reached");         timer1.Enabled = false;     }     else if (Math.Abs((int)distanceSqrd - (int)newDistanceSqrd) < 4)     {         System.Console.WriteLine("Stopping because no change in Old and New position");         timer1.Enabled = false;     } } Ok, so in this function, first we subtract the current marble position from the destination point to give us a vector. The first three lines of the function construct this vector (x, y). The vector (x, y) has the same length as the line from (marble1.x, marble1.y) to (destX, destY) and is in the direction pointing from (marble1.x, marble1.y) to (destX, destY). Note that marble1.x and marble1.y denote the center point of the marble. Then we use Atan2() to get the angle which this vector makes with the positive X axis and use Cosine() and Sine() of that angle to get the unit vector along that same direction. We multiply this unit vector with 6, to get the values which the position of the marble should be incremented by. This variable, speed, can be experimented with and determines how fast the marble moves towards the destination. After this, we check for bounds to make sure that the marble stays within the screen limits and finally we check for the end condition and stop the timer. The end condition has two parts to it. The first case is the normal case, where the user clicks well inside the screen. Here, we stop when the total length travelled by the marble is greater than or equal to the total length to be travelled. Simple enough. The second case is when the user clicks on the very corners of the screen. Like I said before, the values marble1.x and marble1.y denote the center point of the marble. When the user clicks on the corner, the marble moves towards the point, and after some time tries to go outside of the screen, this is when the bounds checking comes into play and corrects the marble position so that the marble stays inside the screen. In this case the marble will never travel a distance of totLenToTravelSqrd, because of the correction is its position. So here we detect the end condition when there is not much change in marbles position. I use the value 4 in the second condition above. After experimenting with a few values, 4 seemed to work okay. There is a small thing missing in the code above. In the normal case, case 1, when the update method runs for the last time, marble position over shoots the destination point. This happens because the position is incremented in steps (which are not small enough), so in this case too, we should have corrected the marble position, so that the center point of the marble sits exactly on top of the destination point. I’ll add this later and update the post. This has been a pretty long post already, so I’ll leave you with a video of how this program looks while running. Notice in the video that the marble moves like a bot, without any grace what so ever. And that is because the speed of the marble is fixed at 6. In the next post we will see how to make the marble move a little more elegantly. And also, if Atan2(), Sine() and Cosine() are a little too much to digest, we’ll see how to achieve the same effect without using them, in the next to next post maybe. Ciao!

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• Oracle Endeca Information Discovery 3.1 is Now Available

  - by p.anda

  Oracle Endeca Information Discovery (OEID) 3.1 is a major release that incorporates significant new self-service discovery capabilities for business users. These include agile data mashup, extended support for unstructured analytics, and an even tighter integration with Oracle BI This release is available for download from: Oracle Delivery Cloud Oracle Technology Network Some of the what's new highlights ... Self-service data mashup... enables access to a wider variety of personal and trusted enterprise data sources. Blend multiple data sets in a single app. Agile discovery dashboards... allows users to easily create, configure, and securely share discovery dashboards with intelligent defaults, intuitive wizards and drag-and-drop configuration. Deeper unstructured analysis ... enables users to enrich text using term extraction and whitelist tagging while the data is live. Enhanced integration with OBI... provides easier wizards for data selection and enables OBI Server as a self-service data source. Enterprise-class data discovery... offers faster performance, a trusted data connection library, improved auditing and increased data connectivity for Hadoop, web content and Oracle Data Integrator. Find out more ... visit the OEID Overview page to download the What's New and related Data Sheet PDF documents. Have questions or want to share details for Oracle Endeca Information Discovery?  The MOS Communities is a great first stop to visit and you can stop-by at MOS OEID Community.

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• Sending changes to a terrain heightmap over UDP

  - by Floomi

  This is a more conceptual, thinking-out-loud question than a technical one. I have a 3D heightmapped terrain as part of a multiplayer RTS that I would like to terraform over a network. The terraforming will be done by units within the gameworld; the player will paint a "target heightmap" that they'd like the current terrain to resemble and units will deform towards that on their own (a la Perimeter). Given my terrain is 257x257 vertices, the naive approach of sending heights when they change will flood the bandwidth very quickly - updating a quarter of the terrain every second will hit ~66kB/s. This is clearly way too much. My next thought was to move to a brush-based system, where you send e.g. the centre of a circle, its radius, and some function defining the influence of the brush from the centre going outwards. But even with reliable UDP the "start" and "stop" messages could still be delayed. I guess I could compare timestamps and compensate for this, although it'd likely mean that clients would deform verts too much on their local simulations and then have to smooth them back to the correct heights. I could also send absolute vert heights in the "start" and "stop" messages to guarantee correct data on the clients. Alternatively I could treat brushes in a similar way to units, and do the standard position + velocity + client-side prediction jazz on them, with the added stipulation that they deform terrain within a certain radius around them. The server could then intermittently do a pass and send (a subset of) recently updated verts to clients as and when there's bandwidth to spare. Any other suggestions, or indications that I'm on the right (or wrong!) track with any of these ideas would be greatly appreciated.

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