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• How do I setup a systemd service to be started by a non root user as a user daemon?

  - by Hans

  I just finished the install and setup process of systemd on my arch-linux system (2012.09.07). I uninstalled initscripts (and removed the configuration files). What I want to do is create a service that can be started and stopped by a non-root user. The service is to start a detached screen session running rtorrent. However I want every user on the system who has set this service to start (enabled) to have a particular instance started for them specifically. How would one go about doing this? I remember reading that systemd supports user instances of services, however I have been unable to find any information on how to set this up, or whether it relates to what I am looking for. Service file that I have used for system: [Unit] Description=rTorrent [Service] Type=forking ExecStart=/usr/bin/screen -d -m -S rtorrent /usr/bin/rtorrent ExecStop=/usr/bin/killall -w -s 2 /usr/bin/rtorrent

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• Pointer position way off in Java Application menu's when using gnome-shell

  - by Hailwood

  When using any java application in gnome-shell if the window is maximised the pointer position is way off; but only on the menu's, in the editor, or the side panel, the pointer is fine. This only presents itself when the window is maximized, and it seems that the further away from 0x0 the window is when you maximise it, the bigger the pointer offset. From what I have gathered it has to do with the window not updating it's size when it gets maximised. The other issue is that when a gnome-shell notification appears, when clicking on it, I lose the ability to type in the editor, I can select text etc, but can't give it focus to type. I must bring up some other text input (e.g. right click on a file on the left, select rename, which brings up a rename dialog) after that I can type in the editor again. So, how can I fix this? Below is as much information as I can think to provide $ gnome-shell --version GNOME Shell 3.6.1 $ java -version java version "1.7.0_09" Java(TM) SE Runtime Environment (build 1.7.0_09-b05) Java HotSpot(TM) 64-Bit Server VM (build 23.5-b02, mixed mode) $ file /etc/alternatives/java /etc/alternatives/javac /etc/alternatives/java: symbolic link to '/usr/lib/jvm/java-7-oracle/jre/bin/java' /etc/alternatives/javac: symbolic link to '/usr/lib/jvm/java-7-oracle/bin/javac'

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• controlling an object through another object ?

  - by Stefano Borini

  Today I've seen the following pattern: you have an object A and an object B. Object B accepts a pointer to A at its constructor. Once B is created, there's a method B.doCalc() that performs a calculation (internally using A's information). The result is obtained with method B.getResult(). In order to perform another calculation, A is modified, and B.doCalc() is called again. What is your opinion on this choice ? I would have designed it differently, but I want to hear your voice. Edit : note that my main objection is to modify A to have a different result from B, without touching B. Although similar, I think that just this discipline expresses a much better feeling of what's going on. Instead of a = new A a.whatever = 5 b = new B(a) b.doCalc() res = b.getResult() a.whatever = 6 b.doCalc() res = b.getResult() You get the a pointer object from b itself. a = new A a.whatever = 5 b = new B(a) b.doCalc() res = b.getResult() a = b.getAPointer() a.whatever = 6 b.doCalc() res = b.getResult() because it makes more explicit the fact that a is taken from b and then modified. I still don't like it, though...

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• SharePoint Web Part Constructor Fires Twice When Adding it to the Page (and has a different security

  - by Damon

  We had some exciting times debugging an interesting issue with SharePoint 2007 Web Parts.  We had some code in staging that had been running just fine for weeks and had not been touched or changed in about the same amount of time.  However, when we tried to move the web part into a different staging environment, the part started throwing a security exception when we tried to add it to a page.  After a bit of debugging, we determined that the web part was throwing the exception while trying to access the SPGroups property on the SharePoint site.  This was pretty strange because we were logged in as an admin and the code was working perfectly fine before.  During the debugging process, however, we found out that the web part constructor was being fired twice.  On one request, the security context did not seem to have everything it needed in order to run.  On the other request, the security context was populated with the user context with the user making the request (like it normally is).  Moving the security code outside of the constructor seems to have fixed the issue. Why the discrepancy between the two staging environments?  Turns out we deployed the part originally, then deployed an update with the security code.  Since the part was never "added" to the page after the code updates were made (we just deployed a new assembly to make the updates), we never saw the problem.  It seems as though the constructor fires twice when you are adding the web part to the page, and when you run the web part from the web part gallery.  My only thought on why this would occur is that SharePoint is instantiating an instance to get some information from it - which is odd because you would think that would happen with reflection without requiring a new object.  Anyway, the work around is to just not put anything security related inside the constructor, or to do a good job accounting for the possibility of the security context not being present if you are adding the item to the page. Technorati Tags: SharePoint,.NET,Microsoft,ASP.NET

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• Trouble getting FTP login to work in IIS6

  - by Frank Rosario

  Hello all, I'm trying to setup an FTP site for one of my clients to pickup files from us using IIS6. I've created the FTP site, have set to not isolate users (not necessary as FTP will be read only with authentication). Here's the problem. The FTP is to be password protected, so I turned of anonymous access on the FTP site. I then created a ftpuser account on the machine, and gave it read and browse directory permissions on the ftp's root directory. However, when I go to test the ftpuser login, I get a 530 "ftpuser cannot login" error. However, if I browse to same directory over HTTP (anonymous access turned off as well) and enter the ftpuser login info, I can download files and browse directories successfully. Why is the ftpuser working over HTTP but not FTP? Shouldn't I be able to login over FTP with the ftpuser login information I just created? Thanks in advance, - Frank

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• XNA C# Platformer - physics engine or tile based?

  - by Hugh

  I would like to get some opinions on whether i should develop my game using a physics engine (farseer physics seems to be the best option) or follow the traditional tile-based method. Quick background: - its a college project, my first game, but have 4 years academic programming experience - Just want a basic platformer with a few levels, nothing fancy - want a shooting mechanic, run and gun, just like contra or metal slug for example - possibly some simple puzzles I have made a basic prototype with farseer, the level is hardcoded with collisions and not really tiled, more like big full-screen sized tiles, with collision bodies drawn manually along the ground and walls etc. My main problem is i want a simple retro feel to the jumping and physics but because its a physics simulation engine its going to be realistic, whereas typical in air controllable physics for platformers arent realistic. I have to make a box with wheel body fixture under it to have this effect and its glitchy and doesnt feel right. I chose to use a physics engine because i tried the tile method initially and found it very hard to understand, the engine took care of alot things to save me time, mainly being able to do slopes easily was nice and the freedom to draw collision bounds wherever i liked, rather then restricted to a grid, which gave me more freedom for art design also. In conclusion i don't know which method to pick, i want to use a method which will be the most straight forward way to implement and wont give me a headache later on, preferably a method which has an abundance of tutorials and resources so i dont get "stuck" doing something which has been done a million times before! Let me know i haven't provided enough information for you to help me! Thanks in advance, Hugh.

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• XOLO X900–First mobile phone with Intel Power

  - by Rekha

  XOLO X900, XOLO’s offering the world’s first smart phone with the power of Intel inside® shaking hands with LAVA International Ltd., India’s fastest growing handset brands. The R&D Centre is in Shenzhan (China) and Bangalore (India). The smart phone has a fast web browsing with the 1.6 GHz Intel processor and smooth multi-tasking process using Intel patented Hyper Threading technology.It has an optimum battery usage, 4.03” hi-resolution of 1024X600 pixels LCD screen to ensure crisp text and vibrant images, HDMI Output port for TV, full HD 1080p playback and dual speakers. It has a camera of 8MP HD camera with certain DSLR like features allowing to click upto 10 photos in less than a second. 3D and HD gaming is immensely realistic with 400 MHz Graphics Processing Unit. The Operating System used here is Android 2.3 (Gingerbread) and upgradable to Android 4.0. It has the GPS facility and rear and front cameras with 8MP and 1.3MP respectively.  They have enabled Accelerometer, Gyroscope, Magnetometer, Ambient light sensor and Proximity sensor in this smart phone. Intel’s smartphone venture is beginning in India first. It is said to be available for sale in Indian from April 23, 2011 onwards. The price is at a best-buy price of INR 22,000 approximately. The smartphone will be available at the Indian retail chain Croma. The phone will available in other retail stores and online stores from early May. The company is launching the smartphone in India first and a more powerful handset in China later this year. According to their success in India and China, Intel is planning to come into Europe and US market. Till then, Intel smartphones are only for Indian buyers. You can more technical information from the XOLO’s site.

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• SQL SERVER – Technical Reference Guides for Designing Mission-Critical Solutions – A Must Read

  - by pinaldave

  Yesterday I was reading architecture reference material helping my friend who was looking for material in this respect. While working together we were searching twitter, facebook and search engines to find relevant material.While searching online we end up on very interactive reference point. Once I send the same to him, he replied he may not need anything more after referencing this material. The best part of this article was it gives access to various aspect of the technology of the image map. Here is the abstract of the original article from the site: The Technical Reference Guides for Designing Mission-Critical Solutions provide planning and architecture guidance for various mission-critical workloads deployed by users. These guides reflect the knowledge gained by Microsoft while working with customers on mission-critical deployments. Each guide provides not only the key technical concepts and information helpful for design, but also “lessons learned,” best practices, and references to customer case studies. Once you click on any of the desired topic, you will see further detailed image map of the selected topic. Personally once I ended up on this site, I was there for more than 2 hours clicking through various links. Click on image to see larger image Read more here: Technical Reference Guides for Designing Mission-Critical Solutions Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQL White Papers, T SQL, Technology

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• Case Management In-Depth: Stakeholders & Permissions by Mark Foster

  - by JuergenKress

  We’ve seen in the previous 3 posts in this series what Case Management is, how it can be configured in BPM Studio and its lifecycle. I now want to go into some more depth with specific areas such as:. Stakeholders & Permissions Case Activities Case Rules etc. In the process of designing a Case Management solution it is important to know what approach to take, what questions to ask and based on the answers to these questions, how to implement. I’ll start with Stakeholders & Permissions. Stakeholders The users that perform actions on case objects, defined at a business level, e.g. “Help Desk Agent”, “Help Desk Supervisor” etc. Read the full article here. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Mix Forum Technorati Tags: ACM,BPM,Mark Foster,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• ASP.NET MVC Resource not found

  - by TheLorax

  I am working on an MVC project in Visual Studio 2010 with .NET Framework 4.0 + MVC2 and everything works if I set the target framework to .NET 4.0. However, my host does not offer .NET 4.0 in order to deploy the site I need to get it working on .NET 3.5. I tried converting it to ASP.NET 3.5 and everything builds just fine except now when I try to load the homepage, I get a 404 Error saying: The resource cannot be found. Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly. Requested URL: /home Version Information: Microsoft .NET Framework Version:2.0.50727.4927; ASP.NET Version:2.0.50727.4927 Anyone know why this is? Thank You for Your help. TheLorax

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• fsck: FILE SYSTEM WAS MODIFIED after each check with -c, why?

  - by Chris

  Hi I use a script to partition and format CF cards (connected with a USB card writer) in an automated way. After the main process I check the card again with fsck. To check bad blocks I also tried the '-c' switch, but I always get a return value != 0 and the message "FILE SYSTEM WAS MODIFIED" (see below). I get the same result when checking the very same drive several times... Does anyone know why a) the file system is modified at all and b) why this seems to happen every time I check and not only in case of an error (like bad blocks)? Here's the output: linux-box# fsck.ext3 -c /dev/sdx1 e2fsck 1.40.2 (12-Jul-2007) Checking for bad blocks (read-only test): done Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information Volume (/dev/sdx1): ***** FILE SYSTEM WAS MODIFIED ***** Volume (/dev/sdx1): 5132/245760 files (1.2% non-contiguous), 178910/1959896 blocks Thanks, Chris

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• Register Now! Oracle 'In Touch' PartnerCast: Be prepared for a year of growth

  - by Julien Haye

  Dear Oracle partners, We would like to invite you to join David Callaghan, Senior Vice President Oracle EMEA Alliances and Channels, and his studio guests for the next broadcast of the ‘In Touch’ PartnerCast on Tuesday 1st July 2014 from 10:30am UK/ 11:30 CET. In this cast, David’s studio guests and his regional reporters will be looking at your priorities as EMEA partners and how best to grow with Oracle. We also look forward to the the broadcast covering the following hot topics: Highlights of FY14 Strategic themes for FY15 SaaS - HCM, CRM, ERP Oracle on Oracle Exclusive for ‘In Touch’ David Callaghan questions Rich Geraffo, Senior Vice President, Global Alliances & Channels, on how the FY15 Global partner kick off relates to EMEA. Plus David provides your chance to hear from some of the newly appointed Oracle Worldwide A&C Leadership team as he discusses with Bruce Chumley VP Oracle Channel Distribution Sales & Troy Richardson VP Oracle Strategic Alliances; their core focus and strategy of growth and what they intend on bringing to the table in their new role. You can now register for the cast here: With lots of studio guests joining David, why not get in touch on Twitter using the hashtag #OracleInTouch or by emailing [email protected] to get your questions featured in the cast! To find out more information and to watch previous episodes on-demand, please visit our webpage here. Best regards, Oracle EMEA Alliances & Channels

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• Google Glasses–A new world in front of your eyes

  - by Gopinath

  Google is getting into a whole new business that would help us to see the world in a new dimension and free us from all gadgets we carry we today. Google Glasses is a wearable tiny computer that brings information in front of your eyes and lets you interact with it using voice commands. It’s a kind of glasses(spectacles) that you can wear to see and interact with the world in a new way.  With Google Glasses, for example you can look at a beautiful location and through voice you can instruct it to capture a photograph and share it to your friends. You don’t need a camera to capture the beautiful scene, you don’t need an App to upload and share it.  All you need is just Google Glasses By the way these glasses are not heavy head mountable stuff, they are very tiny one and look beautiful too. Check out the embedded video demo released by Google to see them in action and for sure you are going to be amazed.   Last year December 9 to 5 Google posted details about this secret project and NY Times says that these glasses would be available to everyone at affordable cost, anywhere between $250 and $600. It is powered by Android OS and the contains a GPS, motion sensor, camera, voice input & output devices. Check out Project Glass for more details.

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• 3.5mm headphone jack -> Component video?

  - by Isaac Waller

  Hello, I have a strange cord that has a male 3.5mm headphone jack on one side, and some component video and audio ouputs on the other. When I plug the headphone side into my computer, and the other side into my TV, I get audio across the cable, but no video. How can I send some video over the headphone jack in OS X? I know you can, because this cable is actually for a Beyblade toy and it somehow transferred video over this cable. Thanks, Isaac I think I found some more information (from Wikipedia:) "A four conductor version (of a 3.5mm headphone jack) is becoming a de facto standard output connector for compact camcorders, providing stereo sound plus a video signal." So how can I do this on Mac?

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• ADF & ADF Mobile Bootcamps in UK, Austria, Spain, Switzerland

  - by JuergenKress

  You want to learn more about innovative features ADF and ADF mobile? You want to get answers how to build modern & mobile applications? Join our 2 days ADF & ADF mobile hands-on Bootcamp. UK Spain Switzerland Austria (one day class) Details Training Audience: Developers, Project Managers, Architects & ADF beginners Trainer: Mireille Duroussaud Language: English Cost: Free of charge, cancelation fee 50€ or no-show fee 2.000€ Note: Bootcamp is limited to 20 persons on first come first serve basis. Preparation:  Attend the free online training ADF 11g Presales Specialist. Follow-up  Pass the free online assessment ADF 11g Presales Specialist. Highlights of the Workshop Oracle Fusion Middleware Development Platform Developing Reusable Business Service Developing Rich Web User Interface and Portals Developing Mobile Apps for iOS and Android with Oracle ADF Mobile For details and registration please visit our registration page. WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. BlogTwitterLinkedInMixForumWiki Technorati Tags: adf,adf training,education,training,WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress

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• Today's Links (6/21/2011)

  - by Bob Rhubart

  Keeping your process clean: Hiding technology complexity behind a service | Izaak de Hullu Izaak de Hullu offers a solution to "technology pollution like exception handling, technology adapters and correlation." WebLogic Weekly for June 20th, 2011 | James Bayer James Bayer presents "a round-up what has been going on in WebLogic over the past week." Publish to EDN from Java & OSB with JMS | Edwin Biemond Busy blogger and Oracle ACE Edwin Biemond shows "how you can publish events from Java and OSB." How is HTML 5 changing web development? | Audrey Watters - O'Reilly Radar In this interview, OSCON speaker Remy Sharp discusses HTML5's current usage and how it could influence the future of web apps and browsers. SOA Governance Book | SOA Partner Community Blog Information on how those in EMEA can win a free copy of SOA Governance: Governing Shared Services On-Premise and in the Cloud by Thomas Erl, et al. Keeping The Faith on 11i | Floyd Teter "The iceberg is melting, the curtain is coming down, the lights are dimming, the fat lady is singing," says Oracle ACE Director Floyd Teter. Configure and test JMS based EDN in SOA Suite 11g | Edwin Biemond Oracle ACE Edwin Biemond shows you "how to configure EDN-JMS and how to publish an Event to this JMS Queue." Choosing the best way for SOA Suite and Oracle Service Bus to interact with the Oracle Database | Lucas Jellema Oracle ACE Director Lucas Jellema illustrates "over 20 different interaction channels" covering "a fairly wild variation of attributes, required skills, productivity and performance characteristics." Oracle Data Integrator 11.1.1.5 Complex Files as Sources and Targets | Alex Kotopoulis ODI 11.1.1.5 adds the new Complex File technology for use with file sources and targets. The goal is to read or write file structures that are too complex to be parsed using the existing ODI File technology. Java Spotlight Podcast Episode 35: JVM Performance and Quality Featuring an interview with Vladimir Ivanov, Ivan Krylov, and Sergey Kuksenko on the JDK 7 Java Virtual Machine performance and quality. Also includes the Java All Star Developer Panel featuring Dalibor Topic, Java Free and Open Source Software Ambassador, and Alexis Moussine-Pouchkine, Java EE Developer Advocate.

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• Virtual Box ie7 won't connect to the internet

  - by j-man86

  I use IE7 & IE8 disk images from microsoft and Virtual Box to test my websites in IE. One day I stopped being able to connect to the internet with virtual box, seemingly after trying to alter proxy related settings to view Hulu.com outside of the U.S... I don't know whether it's coincidence or not. Anyway, I am using the 'PCnet-FAST III (NAT)' adapter with virtual box. Can you guys help me troubleshoot this issue? What information do you need on my current settings? Thanks so much!

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• Moving Windows 7 profile to new user

  - by Kevin Grossnicklaus

  I have a laptop which I've been using as part of a corporate network with an AD login (and associated local profile). The laptop is loaded with Windows 7 Ultimate. I need to remove the laptop from this domain and, to start this process, I have already configured a local user on the box for me to use moving forward (granting this user the same local admin rights as the AD user). I'd like to migrate all the files, settings, etc from the local AD profile to the new non-AD profile. Is there a simple way to do this? Anything built into Win 7? As far as basic files I can probably just manually copy all the documents, pictures, music, desktop, favorites, etc... But is there a more streamlined way to move profile information? -Kevin

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• HTML Maps for DataViz

  - by jamiet

  I don’t talk about data visualisation (#dataviz) much on this blog because, well, because its not something I can claim to be particularly knowledgeable about – that doesn’t stop me from having an opinion about it though. I just stumbled upon an article that compares the media ecosystems of four various technology companies entitled Mapping The Entertainment Ecosystems of Apple, Microsoft, Google & Amazon and apart from being a well-researched and well-written article (not something that the tech press excels in, in my opinion) I was struck by how well the author uses maps to tell a story to the reader. Take the map in this screenshot: Clicking on one of the four icons at the bottom of the map dynamically changes the shaded areas of the map to indicate which countries that company offers their services. Its aesthetically pleasing but moreover it instantly coveys useful information to me. What I love about it most of all though is that its all pure HTML – I don’t need any poxy Silverlight or Flash plugin to view the maps and interact with them – all I need is an up to date web browser (I use Chrome v22 although I tested using IE9 and it worked fine there too). This is how I believe data visualisation should be - conveying useful info in a friction-free way. Maps are a great way of achieving that – I just wish more people agreed with me about calendars as a mechanism for doing the same! @Jamiet

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• Oracle eAM Webcast Series Announced (May-Dec 2010)

  - by [email protected]

  A series of free webinars with ReliabilityWeb will present key product capabilitiesof Oracle eAM and how they support maintenance and reliability best practices. Through this web-seminar series,companies can understand how to achieve better ROI. ReliabilityWeb will be using this as a key component of their initiative tobuild a stronger Oracle community.  For Oracle this program demonstrates leadership and commitment to the Maintenance SystemsMarketplace. Topics: (note all times are EAST)1. How can Oracle eAM enhance and support your reliability program? (May 13,2010) (1-2PM - all times East)) 2. Upgrading to Oracle eAM R12  - What's the value, when's the right time,what's involved and how do you get there? (June 17, 2010) (1-2PM) 3. Improving maintenance and reliability by aligning people, processes andsystems. (July 15, 2010) (1-2PM) 4. Using Oracle eAM to drive your Condition Based Maintenance program. (July29, 2010) (1-2PM) 5. Why and how do you get the power of Oracle eAM out to the people that arereally doing maintenance the technicians. (August 12, 2010) (1-2PM) 6. Standardizing and streamlining your maintenance work with Oracle eAM.(September 16, 2010 (1-2PM) 7. Standardizing maintenance and reliability data - How do you get there?(October 21, 2010 (1-2PM) 8. Using Oracle eAM to establish a Failure Reporting and Corrective ActionSystems (FRACAS). (November 18, 2010) (1-2PM)9. Maintenance Work Scheduling in Oracle eAM - Capabilities and Limitations(December 16, 2010) (1-2PM)to Register:   <http://img.gotomeeting.com/g2mimages/1x1.gif> <http://www1.gotomeeting.com/g2w/images/298420256/73664767535782300/embed.jpg>For additional information contact Jay West, EAM Master,+1.205.515.4326            

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• Reading a large SQL Errorlog

  - by steveh99999

  I came across an interesting situation recently where a SQL instance had been configured with the Audit of successful and failed logins being written to the errorlog. ie This meant… every time a user or the application connected to the SQL instance – an entry was written to the errorlog. This meant…  huge SQL Server errorlogs. Opening an errorlog in the usual way, using SQL management studio, was extremely slow… Luckily, I was able to use xp_readerrorlog to work around this – here’s some example queries..   To show errorlog entries from the currently active log, just for today :- DECLARE @now DATETIME DECLARE @midnight DATETIME SET @now = GETDATE() SET @midnight =  DATEADD(d, DATEDIFF(d, 0, getdate()), 0) EXEC xp_readerrorlog 0,1,NULL,NULL,@midnight,@now   To find out how big the current errorlog actually is, and what the earliest and most recent entries are in the errorlog :- CREATE TABLE #temp_errorlog (Logdate DATETIME, ProcessInfo VARCHAR(20),Text VARCHAR(4000)) INSERT INTO #temp_errorlog EXEC xp_readerrorlog 0 -- for current errorlog SELECT COUNT(*) AS 'Number of entries in errorlog', MIN(logdate) AS 'ErrorLog Starts', MAX(logdate) AS 'ErrorLog Ends' FROM #temp_errorlog DROP TABLE #temp_errorlog To show just DBCC history  information in the current errorlog :- EXEC xp_readerrorlog 0,1,'dbcc'   To show backup errorlog entries in the current errorlog :- CREATE TABLE #temp_errorlog (Logdate DATETIME, ProcessInfo VARCHAR(20),Text VARCHAR(4000)) INSERT INTO #temp_errorlog EXEC xp_readerrorlog 0 -- for current errorlog SELECT * from #temp_errorlog WHERE ProcessInfo = 'Backup' ORDER BY Logdate DROP TABLE #temp_errorlog XP_Errorlog is an undocumented system stored procedure – so no official Microsoft link describing the parameters it takes – however,  there’s a good blog on this here And, if you do have a problem with huge errorlogs – please consider running system stored procedure  sp_cycle_errorlog on a nightly or regular basis.  But if you do this,  remember to change the amount of errorlogs you do retain – the default of 6 might not be sufficient for you….

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• What is the best approach for inline code comments?

  - by d1egoaz

  We are doing some refactoring to a 20 years old legacy codebase, and I'm having a discussion with my colleague about the comments format in the code (plsql, java). There is no a default format for comments, but in most cases people do something like this in the comment: // date (year, year-month, yyyy-mm-dd, dd/mm/yyyy), (author id, author name, author nickname) and comment the proposed format for future and past comments that I want is: // {yyyy-mm-dd}, unique_author_company_id, comment My colleague says that we only need the comment, and must reformat all past and future comments to this format: // comment My arguments: I say for maintenance reasons, it's important to know when and who did a change (even this information is in the SCM). The code is living, and for that reason has a history. Because without the change dates it's impossible to know when a change was introduced without open the SCM tool and search in the long object history. because the author is very important, a change of authors is more credible than a change of authory Agility reasons, no need to open and navigate through the SCM tool people would be more afraid to change something that someone did 15 years ago, than something that was recently created or changed. etc. My colleague's arguments: The history is in the SCM Developers must not be aware of the history of the code directly in the code Packages gets 15k lines long and unstructured comments make these packages harder to understand What do you think is the best approach? Or do you have a better approach to solve this problem?

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• Why does my system use so much cache?

  - by Dave M G

  Previously, on my desktop computer running Ubuntu 14.04, I had 4GB RAM, which I thought should be plenty. However, after being on for a while, my computer would seem to get slow. I have a system resource monitor app in my Gnome panel, which I assume represents the available RAM (?). It shows a dark green area as being "Memory", and a light green area as "Cache". The "Cache" would slowly grow until it filled the whole graph, and then programs would get slow to load, or it would take a while to switch programs. I could alleviate the problem somewhat with this command, but eventually the computer cache fills up again, so it's only a bandaid: sudo sh -c "sync; echo 3 > /proc/sys/vm/drop_caches" So, I figured I'd get more RAM, so I replaced one 2GB stick with an 8GB stick, and now I have 10 GB ram. And my "cache" still slowly maxes out and my computer slows as a result. Also, sometimes the computer starts out with "cache" maxed when I first boot and log in. Not always though, I don't know if there's a pattern that determines why it happens. Why is Ubuntu using up so much cache? Is 10GB not enough for Ubuntu? Here's what my system monitor looks like in my Gnome panel. The middle square shows RAM usage. The light green area is the "cache": This is my memory and swap history, which doesn't seem to include any information about "cache". I realize at this point I'm not totally clear on the difference between "cache" and "swap":

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• 8021x wireless clients auto connect prior to user login

  - by JohnyV

  I am using a 2008 r2 dc that also performs Radius (NPS), I also have a 2008 r2 certificate authority which is giving out certificates. The computers are getting the certificate and when a user logs into the device (that has previously logged in) gets put on the correct VLAN (according to there user access). However I cant get the computers to join the wireless network prior to logging in, so that they can log in with their domain accounts and authenticate through the wireless. The basic setup is Computer gets group policy which tells it to get a certificate the computer then has a seperate vlan to join just as a computer account however the wireless computer wont connect through that vlan. (this vlan allows login information only then once the users credentials are verified it puts them onto another VLAN). So I am trying to work out why the notebook wont auto connect to the wireless network as a computer. Thanks

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• Timeout Considerations for Solicit Response

  - by Michael Stephenson

  Background One of the clients I work with had been experiencing some issues for a while surrounding web service timeouts.  It's been a little challenging to work through the problems due to limitations in the diagnostic information available from one of the applications, but I learned some interesting things while troubleshooting the problem which don't seem to have been discussed much in the community so I thought I'd share my findings. In the scenario we have BizTalk trying to make calls to a .net web service which was exposed as a WSE 2 endpoint.  In the process BizTalk will try to make a large number of concurrent web service calls to the application, and the backend application has more than enough infrastructure and capability to handle the load. We have configured the <ConnectionManagement> section of the BizTalk configuration file to support up to 100 concurrent connections from each of our 2 BizTalk send servers to the web servers of the application. The problem we were facing was that the BizTalk side was reporting a significant number of timeouts when calling the web service.   One of the biggest issues was the challenge of being able to correlate a message from BizTalk to the IIS log in the .net application and the custom logs in the application especially when there was a fairly large number of servers hosting the web services.  However the key moment came when we were able to identify a specific call which had taken 40 seconds to execute on the server (yes a long time I know but that's a different story!).  Anyway we were able to identify that this had timed out on the BizTalk side.  Based on the normal 2 minute timeout we knew something unexpected was going on. From here I decided to do some experimentation and I wanted to start outside of BizTalk because my hunch was this was not a BizTalk behaviour but something which was being highlighted by BizTalk because of our large load.     Server-side - Sample Web Service To begin with I created a sample web service.  Nothing special just a vanilla asmx web service hosted in IIS6 on Windows 2003 Standard Edition.  The web service is just a hello world style web service as shown in the below picture.  The only key feature is that the server side web method has a 30 second sleep in it and will trace out some information before and after the thread is set to sleep.      In the configuration for this web service there again is nothing special it's pretty much the most plain simple web service you could build. Client-Side To begin looking at what was happening with our example I created a number of different ways to consume the web service. SoapHttpClientProtocol Example I created a small application which would use a normal proxy generated to call the web service.  It would iterate around a loop and make calls using the begin/end methods so I can do this asynchronously.  I would do a loop of 20 calls with the ConnectionManager configuration section supporting only 5 concurrent connections to the server.     <connectionManagement> <remove address="*"/> <add address = "*" maxconnection = "12" /> <add address = "http://<ServerName>" maxconnection = "5" />                         </connectionManagement> </system.net>     The below picture shows an example of the service calling code, key points are: I have configured the timeout of 40 seconds for the proxy I am using the asynchronous methods on the proxy to call the web service         The Test I would run the client and execute 21 calls to the web service.   The Results  Below is the client side trace showing what's happening on the client. In the below diagram is the web service side trace showing what's happening on the server Some observations on the results are: All of the calls were successful from the clients perspective You could see the next call starting on the server as soon as the previous one had completed Calls took significantly longer than 40 seconds from the start of our call to the return. In fact call 20 took 2 minutes and 30 seconds from the perspective of my code to execute even though I had set the timeout to 40 seconds     WSE 2 Sample In the second example I used the exact same code to call the web service again with a single exception that I modified the web service proxy to derive from WebServiceClient protocol which is part of WSE 2 (using SP3).  The below picture shows the basic code and the key points are: I have configured the timeout of 40 seconds for the proxy I am using the asynchronous methods on the proxy to call the web service        The Test This test would execute 21 calls from the client to the web service.   The Results  The below trace is from the client side: The below trace is from the server side:   Some observations on the trace results for this scenario are: With call 4 if you look at the server side trace it did not start executing on the server for a number of seconds after the other 4 initial calls which were accepted by the server. I re-ran the test and this happened a couple of times and not on most others so at this point I'm just putting this down to something unexpected happening on the development machine and we will leave this observation out of scope of this article. You can see that the client side trace statement executed almost immediately in all cases All calls after the initial few calls would timeout On the client side the calls that did timeout; timed out in a longer duration than the 40 seconds we set as the timeout You can see that as calls were completing on the server the next calls were starting to come through The calls that timed out on the client did actually connect to the server and their server side execution completed successfully     Elaboration on the findings Based on the above observations I have drawn the below sequence diagram to illustrate conceptually what is happening.  Everything except the final web service object is on the client side of the call. In the diagram below I've put two notes on the Web Service Proxy to show the two different places where the different base classes seem to start their timeout counters. From the earlier samples we can work out that the timeout counter for the WSE web service proxy starts before the one for the SoapHttpClientProtocol proxy and the WSE one includes the time to get a connection from the pool; whereas the Soap proxy timeout just covers the method execution. One interesting observation is if we rerun the above sample and increase the number of calls from 21 to 100,000 then for the WSE sample we will see a similar pattern where everything after the first few calls will timeout on the client as soon as it makes a connection to the server whereas the soap proxy will happily plug away and process all of the calls without a single timeout. I have actually set the sample running overnight and this did happen. At this point you are probably thinking the same thoughts I was at the time about the differences in behaviour and which is right and why are they different? I'm not sure there is a definitive answer to this in the documentation, or at least not that I could find! I think you just have to consider that they are different and they could have different effects depending on your messaging solution. In lots of situations this is just not an issue as your concurrent requests doesn't get to the situation where you end up throttling the web service calls on the client side, however this is definitely more common with an integration broker such as BizTalk where you often have high throughput requirements.  Some of the considerations you should make Based on this behaviour you should be aware of the following: In a .net application if you are making lots of concurrent web service calls from an application in an asynchronous manner your user may thing they are experiencing poor performance but you think your web service is working well. The problem could be that the client will have a default of 2 connections to remote servers so you should bear this in mind When you are developing a BizTalk solution or a .net solution with the WSE 2 stack you may experience timeouts under load and throttling the number of connections using the max connections element in the configuration file will not help you For an application using WSE2 or SoapHttpClientProtocol an expired timeout will not throw an error until after a connection to the server has been made so you should consider this in your transaction and durability patterns     Our Work Around In the short term for our specific scenario we know that we can handle this by just increasing our timeout value.  There is only a specific small window when we get lots of concurrent traffic that causes this scenario so we should be able to increase the timeout to take into consideration the additional client side wait, and on the odd occasion where we do get a timeout the BizTalk send port retry will handle this. What was causing our original problem was that for that short window we were getting a lot of retries which significantly increased the load on our send servers and highlighted the issue.  Longer Term Solution As a longer term solution this really gives us more ammunition to argue a migration to WCF. The application we are calling has some factors which limit the protocols we can use but with WCF we would have more control on the various timeout options because in WCF you can configure specific parts of the timeout. Summary I've had this blog post on my to do list for ages but hopefully it will be useful to some people to just understand this behaviour and to possibly help you with some performance issues you may have. I do not believe there is too much in the way of documentation particularly around WSE2 and ASMX in this area so again another bit of ammunition for migrating to WCF. I'll try to do a follow up post with the sample for WCF to show how this changes things.

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