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  • Work around for calculating age using the SQL Server DateDiff function

    Have you ever wanted to compute age, but the results from the DATEDIFF function seemed to be wrong some of the time? This tip covers why the DATEDIFF function does not always reliably compute age. New! SQL Monitor 3.0 Red Gate's multi-server performance monitoring and alerting tool gets results from Day One.Simple to install and easy to use – download a free trial today.

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  • Sampling SQL server batch activity

    - by extended_events
    Recently I was troubleshooting a performance issue on an internal tracking workload and needed to collect some very low level events over a period of 3-4 hours.  During analysis of the data I found that a common pattern I was using was to find a batch with a duration that was longer than average and follow all the events it produced.  This pattern got me thinking that I was discarding a substantial amount of event data that had been collected, and that it would be great to be able to reduce the collection overhead on the server if I could still get all activity from some batches. In the past I’ve used a sampling technique based on the counter predicate to build a baseline of overall activity (see Mikes post here).  This isn’t exactly what I want though as there would certainly be events from a particular batch that wouldn’t pass the predicate.  What I need is a way to identify streams of work and select say one in ten of them to watch, and sql server provides just such a mechanism: session_id.  Session_id is a server assigned integer that is bound to a connection at login and lasts until logout.  So by combining the session_id predicate source and the divides_by_uint64 predicate comparator we can limit collection, and still get all the events in batches for investigation. CREATE EVENT SESSION session_10_percent ON SERVER ADD EVENT sqlserver.sql_statement_starting(     WHERE (package0.divides_by_uint64(sqlserver.session_id,10))), ADD EVENT sqlos.wait_info (        WHERE (package0.divides_by_uint64(sqlserver.session_id,10))), ADD EVENT sqlos.wait_info_external (        WHERE (package0.divides_by_uint64(sqlserver.session_id,10))), ADD EVENT sqlserver.sql_statement_completed(     WHERE (package0.divides_by_uint64(sqlserver.session_id,10))) ADD TARGET ring_buffer WITH (MAX_DISPATCH_LATENCY=30 SECONDS,TRACK_CAUSALITY=ON) GO   There we go; event collection is reduced while still providing enough information to find the root of the problem.  By the way the performance issue turned out to be an IO issue, and the session definition above was more than enough to show long waits on PAGEIOLATCH*.        

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  • Are all View Models supposed to be accessed through the Main View Model in MVVM?

    - by chustar
    I am currently working on a WP8 application. My current design is to have each view bind against a specific view model directly. Looking through the samples though, it seems that another way is to have all the view models accessed through the Main View Model and then have all the views to their view models through the MVM. Is this the correct way to do it (So that it doesn't cause flexibility and other issues in the future)?

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  • Sempron 145 core unlocking

    - by Grant
    Call me a cheapskate looking for performance, but I have a Sempron 145 processor that has been unlocked to an Athlon II X2 4450e with a GIGABYTE GA-990FXA-UD3 motherboard, but only one of the two processor cores can be used at a time. If both of the cores are enabled in the BIOS the kernel will hang during boot, If I reboot the system and disable the second core (but not re-lock the processor), it will take me to the grub and then start normally. Is there a way to enable both cores and boot without kernel hangs?

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  • Apps Script Office Hours - October 25, 2012

    Apps Script Office Hours - October 25, 2012 - Arun announces an election sample app - soon! Look for the blog post on googleappsdeveloper.blogspot.com - LAX hackathon googleappsdeveloper.blogspot.com - Bill (Google Hangout) asks about ScriptDb. Ikai makes a long analogy about libraries and datastores and offers possible explanations for why certain issues occur, as well as some of the difficulties in working with distributed datastores. From: GoogleDevelopers Views: 48 6 ratings Time: 29:34 More in Science & Technology

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  • Common database deployment blockers and Continuous Delivery headaches

    Deployability is now a first class concern for databases, so why isn’t it as easy as it should be? Matthew Skelton explores seven of the most common challenges which will bring your database deployments to their knees. Get alerts within 15 seconds of SQL Server issuesSQL Monitor checks performance data every 15 seconds, so you can fix issues before your users even notice them. Start monitoring with a free trial.

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  • Oracle Days 2013 in EMEA Are Coming Soon: Invite Your Customers!

    - by Javier Puerta
    Oracle Days will again be hosted across EMEA this October and November (schedule here). By attending an Oracle Day, your customers can: Hear the new announcements from Oracle OpenWorld See customer case studies showing innovation in practice. Discuss key issues for business and IT executives in cloud, mobile, social, big data, The Internet of Things Network with peers who are facing the same challenges Meet Oracle experts and watch live demos of new products  Promoting Oracle Day to Your Customers Follow the Oracle Day schedule in EMEA Direct your customers to the Oracle Day 2013 video on Oracle.com

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  • Point to Taken Care while Microsoft SQL Patching Testing in Production

    - by AbhishekLohani
    Originally posted on: http://geekswithblogs.net/AbhishekLohani/archive/2013/10/29/point-to-taken-care-while-sql-patching-testing--in.aspx Point to Taken Care while Microsoft SQL Patching Testing in Production It very critical testing like Paching testing  1. Build the Test Environment Parrel to Production Environment i.e Staging Environment2 Check the Version of Application deployed is same as Production Environment if Staging Environment not parrel to production environment then risk of defect in production 3.Check End to End Flow of Appliction 4 Check the Eventlog entries 5 Check the performance of the Application . Thanks & RegardsAbhishek

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  • DNRTV: Developing for SharePoint &ndash; Part 2

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). Carl and I got together a couple of weeks ago and chatted about the various interesting facilities in SharePoint 2010 – especially around some real practical challenges that we faced with SharePoint 2007. We talked about a number of indepth practical stuff, such as scalability and performance in SP2010. The latest episode is now online for your viewing pleasure. Comment on the article ....

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  • How do I prevent ISPs from killing downloads of files in mid-transfer?

    - by Gorchestopher H
    I run a small website with a few users, low traffic, mostly to share personal mp3 files with a small community. Depending on their ISP, my users can't always download or stream larger files. By larger I mean larger than 1MB. Essentially the host either stops sending, or the client stops receiving. One of the links along the connection chain simply ends its connection before the transfer completes Trace-route shows no connection issues. There are no connection issues with short transfers that don't take more than a few seconds. It's these 10 second transfers that just end up ending. Just doing a straight download with a direct link can yield this error if you have the wrong ISP. Strangely enough, this is most common with users with ISPs who are essentially independent providers that buy service via a fiber link. Unfortunately these providers aren't very knowledgeable, are unable to do any testing, and insist it's a problem with the host. I have gotten my host to transfer my site to different servers of their, to the same effect. Nearly identical sites (affiliate sites actually) experience no such issue. What can I be doing to further troubleshoot this matter? How can I prove that someone is dropping the ball, and identify who that party is? Can I do a 5Mb traceroute? EDIT Maybe I can clear up some misconceptions with my question: The files are not very large. They are simply over 2Mb. The users do not have "slow" connections, they are at least 5mbps. This "time out" happens very quickly, in the realm of 5 seconds, so I don't know if it's a timeout or not. The user often gets 1 or 2Mb in this chunk of time. I have tried streaming with a flash player. I have tried saving the target. Forcing the download. I have tried allowing the browser to stream the file. I have tried different browsers (FF, IE, Chrome). Users are able to download identical files when on different hosts.

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  • Developer career feeling like going back in time every new job [closed]

    - by komediant
    Is there a good category for this question? My background is bachelor in ICT and for a hobby I am programming already since I was around twelve I think. Started with QBasic, Pascal, C, Java et cetera. Currently I am working for about eight/nine years. Half academics/medical and half company world. A few years ago I started with frameworks and I began with Grails (underlying Spring/Hibernate), which was a heavenly job, very productive and no hassle. My previous job I developed in pure Spring/Hibernate Java, which was a bit more writing annotations and XML and no conventions like Grails. But still, I did like Spring/Hibernate a lot and the professional setup with a developmentstreet, versioning, Jenkins/Sonar, log4j and a good IDE like IntellIJ. It felt quite 'clear' and organised, although I knew Grails which felt a bit more productive. But...at my current job almost half the code is pure servlet, hard coded JDBC (connections handled by yourself), scriptlets in all JSP pages, no service layer, no versioning, no Maven, HTML in DAO-layer, JAR-hell, no hot swap deployment locally, every change you have to deploy and hope it works fine on the server. All local development needs ugly scriptlet tags to check which environment it is running. Et cetera. Now and then developers work over in the evening - I don't - and still lots of issues are not solved and new projects are waiting. I hear the developers complaining, but somehow they feel like what they have now is "advanced" or they are in a sort of comfore zone. The lead developer seems open for new things, but half of the times he says he can implement MVC-framework features himself instead of using what is already out there. So in short, I currently feel like I miss all the modern framework techniques and that the company is going so slow forward. I just work here for two months now. What I do now is also code some partially ugly stuff, but it goes in completely into my nature and I feel uncomfortable with it. Coding something takes long(er) than estimated and my manager complains about why it takes so long and I feel ashamed for myself needing so much time. Where I was used to just writing a query I now build up whole try catch methods. My manager knows my complaints and the developers do so too. There will come a meeting to line out plans for 2013 on technology and the issues I and the company are facing. I am not looking for another job yet, it's close to wehre I live and the economy is fragile. Does anyone else have had this kind of career, like feeling going backwards witch technology? And how did you cope with it?

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  • How to use Dart Editor

    How to use Dart Editor Dart Editor, part of the open-source Dart project, is a light weight and productive editor for Dart. It can help developers editor, refactor, and debug Dart apps. Watch this video to learn more about Dart Editor and its many features to help developers be more productive building high performance web apps. From: GoogleDevelopers Views: 104 2 ratings Time: 05:34 More in Science & Technology

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  • Learning PHP from beginner to advanced

    - by Liam
    I've dabbled with PHP for a few years now and I'm capable of most of the basic things, building login forms etc but from my time on here I've noticed there's so much more I need to learn, like best practices, security issues etc and so I want to learn everything from the very basics. In the past I've used forums and browsed the web for snippets of code only I think this has led to my bad practices, can anybody recommend books or Valid, recommended learning sources? Thanks in advance!

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  • La gamme Exalogic d'Oracle s'enrichit et offre des performances extrêmes pour les applications Java

    La gamme Exalogic d'Oracle s'enrichit Et offre un choix encore plus étendu de solutions de consolidation et des performances extrêmes pour les applications Java Dans la foulée de la présentation de ses tous nouveaux serveurs SPARC Supercluster T3, http://www.developpez.com/actu/24664...s-de-plus-IBM/ Oracle vient d'annonce Oracle Exalogic Elastic Cloud T3-1B, un nouveau modèle qui permet aux systèmes intégrés Oracle Exalogic Elastic Cloud de bénéficier des caractéristiques des serveurs SPARC Solaris en matière de performance, d'évoluti...

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  • Manipulating XML Data in SQL Server

    When the average database developer is obliged to manipulate XML, either shredding it into relational format, or creating it from SQL, it is often done 'at arms length'. A shame, since effective use of techniques that go beyond the basics can save much code, "It really helped us isolate where we were experiencing a bottleneck"- John Q Martin, SQL Server DBA. Get started with SQL Monitor today to solve tricky performance problems - download a free trial

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  • Patch Tuesday Again!

    - by TATWORTH
    Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2014/06/10/patch-tuesday-again.aspxThe second Tuesday of the month is “Patch Tuesday” when Microsoft issues the security and other important fixes for the month. This month there are two critical and five important patches. So watch out for these patches and apply them to your Windows PCs as soon as you can. For more details see http://www.itpro.co.uk/desktop-software/22421/microsoft-to-roll-out-two-critical-security-bug-fixes.

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  • SQL Monitor Custom Metric: Out of memory errors

    The number of out of memory errors that have occurred within a rolling five minute window. If you just want to keep an eye out for any memory errors, you can watch the ring buffers for the Out of memory errors alert when it gets registered there. Get alerts within 15 seconds of SQL Server issuesSQL Monitor checks performance data every 15 seconds, so you can fix issues before your users even notice them. Start monitoring with a free trial.

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  • Liquid XML 2012 Service Pack 1 available

    - by bconlon
    Liquid XML Editor is one of my favourite tools, but I was slightly concerned with the original 2012 release as the new XML Data Mapper tool was a bit buggy. So I was pleased to see SP1 is now available for download.Sure enough the issues have been fixed and it's once more a great tool!The data mapper can also now be run from the command line (this was a little limiting before as you had to open the IDE to run the mapping) and the Help now contains full documentation.#

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  • Exporting Execution Plans - SQL Spackle

    A short SQL Spackle article to fill in your knowledge of SQL Server. In this one, Jason Brimhall shows how to export execution plans when you ask for query tuning help. Optimize SQL Server performance“With SQL Monitor, we can be proactive in our optimization process, instead of waiting until a customer reports a problem,” John Trumbul, Sr. Software Engineer. Optimize your servers with a free trial.

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  • Configuring Database Mirroring

    This article contains a set of instructions for configuring SQL Server mirroring, including pre-requisites. It also includes notes on how to resolve a few issues that I have encountered. Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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  • T-SQL: Why “It Depends”

    Why does everyone use "it depends" as an answer to many T-SQL questions? Bob Hovious brings us a short example of how performance can change based on data loads for the same code.

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  • How to profile a Perl + FastCGi + StarRunner web program?

    - by Paul Tomblin
    I've written an extension to RequestTracker for a client, but he says the performance isn't good enough. I'd like to do some profiling, but I'm not sure how to connect up a profiler (say NYTProf, for example)? I tried what the man page says and put PerlModule Devel::NYTProf::Apache in my apache config, but all I get in the results are Apache2:XSLoader, Devel::NYTProf::Apache and ModPerl::Util modules in the results, and neither my own nor RT's modules.

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  • Linux WD EARS Advanced Hard Drive Format

    <b>LinuxConfig:</b> "Nowadays hard drive manufactures are switching to a new hard drive technology which uses 4KB sectors size instead of conventional 512B. This new technology requires little tweaks to get a better performance in comparison to out-of-the-box settings."

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  • Exadata Planning and Development Workbook

    - by Javier Puerta
    The Oracle Exadata Workbook series has been created to provide guidance for planning,installing, operating and maintaining Oracle Exadata Database Machines. These workbooks will help you identify specific needs, address potential challenges, and understand the opportunities associated with owning this advanced Engineered System. A well-planned implementation will help you realize the performance,scalability, and administrative improvements of an Oracle Exadata system. Register with your OTN login to download the first workbook in the Oracle Exadata Admin series.

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