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  • SQLAuthority News – Statistics Used by the Query Optimizer in Microsoft SQL Server 2008 – Microsoft Whitepaper

    - by pinaldave
    I recently presented session on Statistics and Best Practices in Virtual Tech Days on Nov 22, 2010. The sessions was very popular and I got many questions right after the sessions. The number question I had received was where everybody can get the further information. I am very much happy that my sessions created some curiosity for one of the most important feature of the SQL Server. Statistics are the heart of the SQL Server. Microsoft has published a white paper on the subject how statistics are useful to Query Optimizer. Here is the abstract of the same white paper from Microsoft. Statistics Used by the Query Optimizer in Microsoft SQL Server 2008 Writer: Eric N. Hanson and Yavor Angelov Microsoft SQL Server 2008 collects statistical information about indexes and column data stored in the database. These statistics are used by the SQL Server query optimizer to choose the most efficient plan for retrieving or updating data. This paper describes what data is collected, where it is stored, and which commands create, update, and delete statistics. By default, SQL Server 2008 also creates and updates statistics automatically, when such an operation is considered to be useful. This paper also outlines how these defaults can be changed on different levels (column, table, and database). In addition, it presents how certain query language features, such as Transact-SQL variables, interact with use of statistics by the optimizer, and it provides guidance for using these features when writing queries so you can obtain good query performance. Link to white paper Statistics Used by the Query Optimizer in Microsoft SQL Server 2008 ?Reference: Pinal Dave (http://blog.SQLAuthority.com)   Filed under: Pinal Dave, SQL, SQL Authority, SQL Documentation, SQL Download, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, SQL White Papers, SQLAuthority News, T SQL, Technology

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  • LED Monitor brightness

    - by Yuval
    I am in the market for a new monitor. I've been looking around and it seems that the general brightness for monitors is between 250-320 cd/m2. After hours of searching, I narrowed it down to the LG W2453V-PF vs. the LG E2350V-SN The W2453V-PF is not LED backlit yet it has a brightness level of 310 cd/m2 and a response time of 2ms. The E2350V-SN, on the other hand, has a brightness level of 250 cd/m2 and a response time of 5ms but it is LED backlit. My questions are, looking at these overall specs: Which monitor is better? What makes LED backlight better? Is the LED backlight worth the decreased brightness level? Thanks! p.s. if you have any other comparable monitor suggestions (that are not samsung - I read their customer service is absolutely terrible), feel free to share. thanks!

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  • APT: Hold packages back from updates without APT Pin

    - by David
    I know about pinning packages with APT; that's not what I want to do. Other questions have been answered with either using pinning or by using pins temporarily. I don't want to do this... What I want to do is keep packages back the same way the kernel has been: # apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: linux-generic-pae linux-headers-generic-pae linux-image-generic-pae The following packages will be upgraded: I want to add tomcat-* and mysql-* and sun-* to this list. In the past, there was a configuration parameter to do this - I've always thought it was something like Apt::Get::HoldPkgs or Apt::HoldPkgs but I can't find it. I want to have these packages held from updates until I specifically request them with an "apt-get install". I found the apt-get configuration Apt::NeverAutoRemove; will this do what I want? Added Question: I notice that Apt::NeverAutoRemove and Apt::Never-MarkAuto-Sections (among others) are not documented so far as I can see; they're not in the manpages. Neither is aptitude::Keep-Unused-Pattern and aptitude::Get-Root-Command. Is there any comprehensive and complete documentation for apt.conf?

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  • Networking with Windows 7

    - by Alix Axel
    I got several computers connected to my home wireless network and I want to make use of some of the features of Windows 7 for home networks but I can't seem to get them working: How do I keep files and folders in sync between specific computers? I'm not talking about Live Sync. How can I stream to Windows Media Player from another computer? I would appreciate if someone could provide me some links / solutions that address my needs. Thanks! To anyone who thinks this question is a duplicate and wants to close it please bare in mind the following: I'm not looking for additional software, I know I can use Live Sync, Dropbox and so on but I'm asking this: how do I configure Windows 7 to sync files between my home network - no Internet required! This has something to do with shared folders and offline files in Windows 7, but I can't get it to work. PS: Please merge with this question: http://superuser.com/questions/139763/networking-with-windows-7

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  • Update packages on very old ubuntu

    - by meewoK
    I want to add Mysqli support to a machine running: Server Version: Apache/2.2.4 (Ubuntu) PHP/5.2.3-1ubuntu6.3 I would rather not update more things then I need to. I run the following: sudo apt-get install php5-mysql However, as the ubuntu version is old I get the following. WARNING: The following packages cannot be authenticated! php5-cli php5-mysql php5-mhash php5-xsl php5-pspell php5-snmp php5-curl php5-xmlrpc php5-sqlite php5-gd libapache2-mod-php5 php5-common Install these packages without verification [y/N]? Y Err http://gr.archive.ubuntu.com gutsy-updates/main php5-cli 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-cli 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-mysql 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-mhash 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-xsl 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-pspell 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-snmp 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-curl 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-xmlrpc 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-sqlite 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-gd 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main libapache2-mod-php5 5.2.3-1ubuntu6.4 404 Not Found Err http://security.ubuntu.com gutsy-security/main php5-common 5.2.3-1ubuntu6.4 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-cli_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-mysql_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-mhash_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-xsl_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-pspell_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-snmp_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-curl_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-xmlrpc_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-sqlite_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-gd_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/libapache2-mod-php5_5.2.3-1ubuntu6.4_i386.deb 404 Not Found Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/p/php5/php5-common_5.2.3-1ubuntu6.4_i386.deb 404 Not Found E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? Questions Can I add mysqli feature using another method instead of sudo-apt get? Even if successful can this break something on the system? Update: I have tried to add additional sources using the instructions from: http://superuser.com/questions/339537/where-can-i-get-therepositories-for-old-ubuntu-versions I have the following in the /etc/apt/sources.list file: # deb cdrom:[Ubuntu-Server 7.10 _Gutsy Gibbon_ - Release i386 (20071016)]/ gutsy main restricted #deb cdrom:[Ubuntu-Server 7.10 _Gutsy Gibbon_ - Release i386 (20071016)]/ gutsy main restricted # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://gr.archive.ubuntu.com/ubuntu/ gutsy main restricted universe multiverse deb http://gr.archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse deb-src http://gr.archive.ubuntu.com/ubuntu/ gutsy main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://gr.archive.ubuntu.com/ubuntu/ gutsy-updates main restricted deb-src http://gr.archive.ubuntu.com/ubuntu/ gutsy-updates main restricted ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## universe WILL NOT receive any review or updates from the Ubuntu security ## team. deb http://gr.archive.ubuntu.com/ubuntu/ gutsy-updates universe deb-src http://gr.archive.ubuntu.com/ubuntu/ gutsy-updates universe ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. #deb http://gr.archive.ubuntu.com/ubuntu/ gutsy multiverse deb-src http://gr.archive.ubuntu.com/ubuntu/ gutsy multiverse deb http://gr.archive.ubuntu.com/ubuntu/ gutsy-updates multiverse deb-src http://gr.archive.ubuntu.com/ubuntu/ gutsy-updates multiverse ## Uncomment the following two lines to add software from the 'backports' ## repository. ## N.B. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. # deb http://gr.archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse # deb-src http://gr.archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse ## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. This software is not part of Ubuntu, but is ## offered by Canonical and the respective vendors as a service to Ubuntu ## users. # deb http://archive.canonical.com/ubuntu gutsy partner # deb-src http://archive.canonical.com/ubuntu gutsy partner deb http://security.ubuntu.com/ubuntu gutsy-security main restricted deb-src http://security.ubuntu.com/ubuntu gutsy-security main restricted deb http://security.ubuntu.com/ubuntu gutsy-security universe deb-src http://security.ubuntu.com/ubuntu gutsy-security universe deb http://security.ubuntu.com/ubuntu gutsy-security multiverse deb-src http://security.ubuntu.com/ubuntu gutsy-security multiverse # Required deb http://old-releases.ubuntu.com/ubuntu/gutsy main restricted universe multiverse deb http://old-releases.ubuntu.com/ubuntu/gutsy-updates main restricted universe multiverse deb http://old-releases.ubuntu.com/ubuntu/gutsy-security main restricted universe multiverse

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  • Two Virtualization Webinars This Week

    - by chris.kawalek(at)oracle.com
    If you're interested in virtualization, be sure to catch our two free webinars this week. You'll hear directly from Oracle technologists and can ask questions in a live Q&A. Deploying Oracle VM Templates for Oracle E-Business Suite and Oracle PeopleSoft Enterprise Applications Tuesday, Feb 15, 2011 9AM Pacific Time Register Now Is your company trying to manage costs; meet or beat service level agreements and get employees up and running quickly on business-critical applications like Oracle E-Business Suite and Oracle PeopleSoft Enterprise Applications? The fastest way to get the benefits of these applications deployed in your organization is with Oracle VM Templates. Cut application deployment time from weeks to just hours or days. Attend this session for the technical details of how your IT department can deliver rapid software deployment and eliminate installation and configuration costs by providing pre-installed and pre-configured software images. Increasing Desktop Security for the Public Sector with Oracle Desktop Virtualization Thursday, Feb 17, 2011 9AM Pacific Time Register Now Security of data as it moves across desktop devices is a concern for all industries. But organizations such as law enforcement, local, state, and federal government and others have higher security ne! eds than most. A virtual desktop model, where no data is ever stored on the local device, is an ideal architecture for these organizations to deploy. Oracle's comprehensive portfolio of desktop virtualization solutions, from thin client devices, to sever side management and desktop hosting software, provide a complete solution for this ever-increasing problem.

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  • Issue 15: Oracle PartnerNetwork Exchange @ Oracle OpenWorld

    - by rituchhibber
         ORACLE FOCUS Oracle PartnerNetwork Exchange@ ORACLE OpenWorld Sylvie MichouSenior DirectorPartner Marketing & Communications and Strategic Programs RESOURCES -- Oracle OpenWorld 2012 Oracle PartnerNetwork Exchange @ OpenWorld Oracle PartnerNetwork Exchange @ OpenWorld Registration Oracle PartnerNetwork Exchange SpecializationTest Fest Oracle OpenWorld Schedule Builder Oracle OpenWorld Promotional Toolkit for Partners Oracle Partner Events Oracle Partner Webcasts Oracle EMEA Partner News SUBSCRIBE FEEDBACK PREVIOUS ISSUES If you are attending our forthcoming Oracle OpenWorld 2012 conference in San Francisco from 30 September to 4 October, you will discover a new dedicated programme of keynotes and sessions tailored especially for you, our valued partners. Oracle PartnerNetwork Exchange @ OpenWorld has been created to enhance the opportunities for you to learn from and network with Oracle executives and experts. The programme also provides more informal opportunities than ever throughout the week to meet up with the people who are most important to your business: customers, prospects, colleagues and the Oracle EMEA Alliances & Channels management team. Oracle remains fully focused on building the industry's most admired partner ecosystem—which today spans over 25,000 partners. This new OPN Exchange programme offers an exciting change of pace for partners throughout the conference. Now it will be possible to enjoy a fully-integrated, partner-dedicated session schedule throughout the week, as well as key social events such as the Sunday night Welcome Reception, networking lunches from Monday to Thursday at the Howard Street Tent, and a fantastic closing event on the last Thursday afternoon. In addition to the regular Oracle OpenWorld conference schedule, if you have registered for the Oracle PartnerNetwork Exchange @ OpenWorld programme, you will be invited to attend a much anticipated global partner keynote presentation, plus more than 40 conference sessions aimed squarely at what's most important to you, as partners. Prominent topics for discussion will include: Oracle technologies and roadmaps and how they fit with partners' business plans; business development; regional distinctions in business practices; and much more. Each session will provide plenty of food for thought ahead of the numerous networking opportunities throughout the week, encouraging the knowledge exchange with Oracle executives, customers, prospects, and colleagues that will make this conference of even greater value for you. At Oracle we always work closely with our partners to deliver solution offerings that improve business value, simplify the IT experience and drive innovation and efficiencies for joint customers. The most important element of our new OPN Exchange is content that helps you get more from technology investments, more from your peer-to-peer connections, and more from your interactions with customers. To this end we've created some partner-specific tools which can be used by OPN members ahead of the conference itself. Crucially, a comprehensive Content Catalog already lists and organises details of every OPN Exchange session, speaker, exhibitor, demonstration and related materials. This Content Catalog can be used by all our partners to identify interesting content that you can add to your own personalised Oracle OpenWorld Schedule Builder, allowing more effective planning and pre-enrolment for vital sessions. There are numerous highlights that you will definitely want to include in those personal schedules. On Sunday morning, 30 September we will start the week with partner dedicated OPN Exchange sessions, following our Global Partner Keynote at 13:00 with Judson Althoff, SVP, Worldwide Alliances & Channels and Embedded Sales and senior executives, giving insight into Oracle's partner vision, strategy, and resources—all designed to help build and strengthen market opportunities for you. This will be followed by a number of OPN Exchange general sessions, the Oracle OpenWorld Opening Keynote with Larry Ellison, CEO, Oracle and concluded with the OPN Exchange AfterDark Welcome Reception, starting at 19:30 at the Metreon. From Monday 1 to Thursday 4 October, you can attend the OPN Exchange sessions that are most relevant to your business today and over the coming year. Oracle's top product and sales leaders will be on hand to discuss Oracle's strategic direction in 40+ targeted and in-depth sessions focussing on critical success factors to develop your business. Oracle's dedication to innovation, specialization, enablement and engineering provides Oracle partners with a huge opportunity to create new services and solutions, differentiate themselves and deliver extreme value to joint customers across the globe. Oracle will even be helping over 1000 partners to earn OPN Specialization certification during the Oracle OpenWorld OPN Exchange Test Fest, which will be providing all the study materials and exams required to drive Specialization for free at the conference. You simply need to check the list of current certification tracks available, and make sure you pre-register to reserve a seat in one of the ten sessions being offered free to OPN Exchange registered attendees. And finally, let's not forget those all-important networking opportunities, which can so often provide partners with valuable long-term alliances as well as exciting new business leads. The Oracle PartnerNetwork Lounge, located at Moscone South, exhibition hall, room 100 is the place where partners can meet formally or informally with colleagues, customers, prospects, and other industry professionals. OPN Specialized partners with OPN Exchange passes can also visit the OPN Video Blogging room to record and share ideas, and at the OPN Information Station you will find consultants available to answer your questions. "For the first time ever we will have a full partner conference within OpenWorld. OPN Exchange @ OpenWorld will kick-off on the first Sunday and run the entire week. We'll have over 40 sessions throughout that time and partners will hear from our top development executives, with special sessions dedicated to partnering throughout. It's going to be a phenomenal event, and we look forward to seeing our partners there." Judson Althoff, SVP, Oracle Worldwide Alliances & Channels and Embedded Sales So if you haven't done so already, please register for Oracle PartnerNetwork Exchange @ OpenWorld today or add OPN Exchange to your existing registration for just $100 through My Account. And if you have any further questions regarding partner activities at Oracle OpenWorld, please don't hesitate to contact the Oracle PartnerNetwork team at [email protected] will be on hand to share the very latest information about: Oracle's SPARC Superclusters: the latest Engineered Systems from Oracle, delivering radically improved performance, faster deployment and greatly reduced operational costs for mixed database and enterprise application consolidation Oracle's SPARC T4 servers: with the newly developed T4 processor and Oracle Solaris providing up to five times the single threaded performance and better overall system throughput for expanded application versatility Oracle Database Appliance: a new way to take advantage of the world's most popular database, Oracle Database 11g, in a single, easy-to-deploy and manage system. It's a complete package engineered to deliver simple, reliable and affordable database services to small and medium size businesses and departmental systems. All hardware and software components are supported together and offer customers unique pay-as-you-grow software licensing to quickly scale from two to 24 processor cores without incurring the costs and downtime usually associated with hardware upgrades Oracle Exalogic: the world's only integrated cloud machine, featuring server hardware and middleware software engineered together for maximum performance with minimum set-up and operational cost Oracle Exadata Database Machine: the only database machine that provides extreme performance for both data warehousing and online transaction processing (OLTP) applications, making it the ideal platform for consolidating onto grids or private clouds. It is a complete package of servers, storage, networking and software that is massively scalable, secure and redundant Oracle Sun ZFS Storage Appliances: providing enterprise-class NAS performance, price-performance, manageability and TCO by combining third-generation software with high-performance controllers, flash-based caches and disks Oracle Pillar Axiom Quality-of-Service: confidently consolidate storage for multiple applications into a single datacentre storage solution Oracle Solaris 11: delivering secure enterprise cloud deployments with the ability to run hundreds of virtual application with no overhead and co-engineered with other Oracle software products to provide the highest levels of security, manageability and performance Oracle Enterprise Manager 12c: Oracle's integrated enterprise IT management product, providing the industry's only complete, integrated and business-driven enterprise cloud management solution Oracle VM 3.0: the latest release of Oracle's server virtualisation and management solution, helping to move datacentres beyond server consolidation to improve application deployment and management. Register today and ensure your place at the Extreme Performance Tour! Extreme Performance Tour events are free to attend, but places are limited. To make sure that you don't miss out, please visit Oracle's Extreme Performance Tour website, select the city that you'd be interest in attending an event in, and then click on the 'Register Now' button for that city to secure your interest. Each individual city page also contains more in-depth information about your local event, including logistics, agenda and maybe even a preview of VIP guest speakers. -- Oracle OpenWorld 2010 Whether you attended Oracle OpenWorld 2009 or not, don't forget to save the date now for Oracle OpenWorld 2010. The event will be held a little earlier next year, from 19th-23rd September, so please don't miss out. With thousands of sessions and hundreds of exhibits and demos already lined up, there's no better place to learn how to optimise your existing systems, get an inside line on upcoming technology breakthroughs, and meet with your partner peers, Oracle strategists and even the developers responsible for the products and services that help you get better results for your end customers. Register Now for Oracle OpenWorld 2010! Perhaps you are interested in learning more about Oracle OpenWorld 2010, but don't wish to register at this time? Great! Please just enter your contact information here and we will contact you at a later date. How to Exhibit at Oracle OpenWorld 2010 Sponsorship Opportunities at Oracle OpenWorld 2010 Advertising Opportunities at Oracle OpenWorld 2010 -- Back to the welcome page

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  • Convert OpenGL code to DirectX

    - by Fredrik Boston Westman
    First of all, this is kind of a follow up question on @byte56 excellent anwser on this question concerning picking algorithms. I'm trying to convert one of his code examples to directX 11 however I have run into some problems ( I can pick but the picking is way off), and I wanted to make sure I had done it right before moving on and checking the rest of my code. I am not that familiar with openGl but I can imagine openGl has different coordinations systems, and functions that alters how you must implement to code a bit. The getPickRay function on the answer linked is what I'm trying to convert. This is the part of my code that I think is giving me trouble when converting from openGl to directX Because I'm unsure on how their different coordination systems differs from one another. PRVecX = ((( 2.0f * mouseX) / ClientWidth ) - 1 ) * tan((viewAngle)/2); PRVecY = (1-(( 2.0f * mouseY) / ClientHeight)) * tan((viewAngle)/2); Another thing that I am unsure about is this part: XMVECTOR worldSpaceNear = XMVector3TransformCoord(cameraSpaceNear, invMat); XMVECTOR worldSpaceFar = XMVector3TransformCoord(cameraSpaceFar, invMat); A couple of notes: The mouse coordinates are already converted so that the top left corner of the client window would be (0,0) and the bottom right (800,600) ( or whatever resolution you would have) The viewAngle is the same angle that I used when setting the camera view with XMMatrixPerspectiveFovLH. I removed the variables aspectRatio and zoomFactor because I assumed that they were related to some specific function of his game. To summarize it up to questions : Does the openGL coordination system differ in such a way that this equation in the first of my code examples wouldn't be valid when used in DirectX 11 ( with its respective screen coordination system)? Is the openGL method Matrix4f.transform(a, b, c) equal to the directX method c = XMVector3TransformCoord(b,a)? (where a is a matrix and b,c are vectors). Because I know when it comes to matrices order is important.

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  • Best Practices for Renaming, Refactoring, and Breaking Changes with Teams

    - by David in Dakota
    What are some Best Practices for refactoring and renaming in team environments? I bring this up with a few scenarios in mind: If a library that is commonly referenced is refactored to introduce a breaking change to any library or project that references it. E.g. arbitrarily changing the name of a method. If projects are renamed and solutions must be rebuilt with updated references to them. If project structure is changed to be "more organized" by introducing folders and moving existing projects or solutions to new locations. Some additional thoughts/questions: Should changes like this matter or is resulting pain an indication of structure gone awry? Who should take responsibility for fixing errors related to a breaking change? If a developer makes a breaking change should they be responsible for going into affected projects and updating them or should they alert other developers and prompt them to change things? Is this something that can be done on a scheduled basis or is it something that should be done as frequently as possible? If a refactoring is put off for too long it is increasingly difficult to reconcile but at the same time in a day spending 1 hour increments fixing a build because of changes happening elsewhere. Is this a matter of a formal communication process or can it be organic?

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  • Sneak peek at next generation Three MiFi unit – Huawei E585

    - by Liam Westley
    Last Wednesday I was fortunate to be invited to a sneak preview of the next generation Three MiFi unit, the Huawei E585. Many thanks to all those who posted questions both via this blog or via @westleyl on Twitter. I think I made sure I asked every question posed to the MiFi product manager from Three UK, and so here's the answers you were after. What is a MiFi? For those who are wondering, a MiFi unit is a 3G broadband modem combined with a WiFi access point, providing 3G broadband data access to up to five devices simultaneously via standard WiFi connections. What is different? It appears the prime task of enhancing the MiFi was to improve the user experience and user interface, both in terms of the device hardware and within the management software to configure the device.  I think this was a very sensible decision as these areas had substantial room for improvement. Single button operation to switch on, enable WiFi and connect to 3G Improved OELD display (see below), replacing the multi coloured LEDs; including signal strength, SMS notifications, the number of connected clients and data usage Management is via a web based dashboard accessible from any web browser. This is a big win for those running Linux, Mac OS/X, iPad users and, for me, as I can now configure the device from Windows 7 64-bit Charging is via micro USB, the new standard for small USB devices; you cannot use your old charger for the new MiFi unit Automatic reconnection when regaining a signal Improved charging time, which should allow recharging of the device when in use Although subjective, the black and silver design does look more classy than the silver and white plastic of the original MiFi What is the same? Virtually the same size and weight The battery is the same unit as the original MiFi so you’ll have a handy spare if you upgrade Data plans remain the same as the current MiFi, so cheapest price for upgraders will be £49 pay as you go Still only works on 3G networks, with no fallback to GPRS or EDGE There is no specific upgrade path for existing three customers, either from dongle or from the original MiFi My opinion I think three have concentrated on the correct areas of usability and user experience rather than trying to add new whizz bang technology features which aren’t of interest to mainstream users. The one button operation and the improved device display will make it much easier to use when out and about. If the automatic reconnection proves reliable that will remove a major bugbear that I experienced the previous evening when travelling on the First Great Western line from Paddington to Didcot Parkway.  The signal was repeatedly lost as we sped through tunnels and cuttings, and without automatic reconnection is was a real pain to keep pressing the data button on the MiFi to re-establish my data connection. And finally, the web based dashboard will mean I no longer need to resort to my XP based netbook to configure the SSID and password. My everyday laptop runs Windows 7 64-bit which appears to confuse the older 3 WiFi manager which cannot locate the MiFi when connected. Links to other sites, and other images of the device Good first impressions from Ben Smith, http://thereallymobileproject.com/2010/06/3uk-announce-a-new-mifi-with-a-screen/ Also, a round up of other sneak preview posts, http://www.3mobilebuzz.com/2010/06/11/mifi-round-two-your-view/ Pictures Here is a comparison of the old MiFi device next to the new device, complete with OLED display and the Huawei logo now being a prominent feature on the front of the device. One of my fellow bloggers had a Linux based netbook, showing off the web based dashboard complete with Text messages panel to manage SMS. And finally, I never thought that my blog sub title would ever end up printed onto a cup cake, ... and here's some of the other cup cakes ...

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  • SQLAuthority News – Statistics and Best Practices – Virtual Tech Days – Nov 22, 2010

    - by pinaldave
    I am honored that I have been invited to speak at Virtual TechDays on Nov 22, 2010 by Microsoft. I will be speaking on my favorite subject of Statistics and Best Practices. This exclusive online event will have 80 deep technical sessions across 3 days – and, attendance is completely FREE. There are dedicated tracks for Architects, Software Developers/Project Managers, Infrastructure Managers/Professionals and Enterprise Developers. So, REGISTER for this exclusive online event TODAY. Statistics and Best Practices Timing: 11:45am-12:45pm Statistics are a key part of getting solid performance. In this session we will go over the basics of the statistics and various best practices related to Statistics. We will go over various frequently asked questions like a) when to update statistics, b) different between sync and async update of statistics c) best method to update statistics d) optimal interval of updating statistics. We will also discuss the pros and cons of the statistics update. This session is for all of you – whether you’re a DBA or developer! You can register for this event over here. If you have never attended my session on this subject I strongly suggest that you attend the event as this is going to be very interesting conversation between us. If you have attended this session earlier, this will contain few new information which will for sure interesting to share with all. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: MVP, Pinal Dave, SQL, SQL Authority, SQL Joins, SQL Optimization, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, T SQL, Technology Tagged: SQL Statistics, Statistics

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  • SQL SERVER – A Puzzle – Illusion – Confusion – April Fools’ Day

    - by pinaldave
    Today is April 1st and just like every other year, I like to bring something interesting and light for the day. Atleast there should be days in every one’s life when they should feel easy. Here is a quick puzzle for you and I believe it will make you feel extremely smart if you can figure out the result behind the same. Run following in SQL Server Management Studio and observe the output: SELECT 30.0/(-2.0)/5.0; SELECT 30.0/-2.0/5.0; Here are few questions for you: 1) What will be the result of above two queries? 2) Why? If you think you can figure out the result without executing them – I encourage you to execute BOTH of them in SSMS and see if they give you same result or different result. Well, now I am waiting for your answer here – why? I often post similar things on my facebook page http://facebook.com/SQLAuth – you are welcome to play with me there. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Puzzle, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Getting VMWare ESXi 5.0.0 with RAID using the Intel X79 chipset to work

    - by Deleted
    I have bought a new server where I use the motherboard ASUS P9X79 WS X79 S-2011 ATX. It will be used for virtualization, preferably using VMware vSphere Hypervisor™ (ESXi) if I can get the RAID on my motherboard working with VMWare (it does not detect it). The motherboard has the Intel® X79 chipset, which for RAID controller means vendor ID 8086 (Intel) and model ID 2826. When I boot the ESXi 5.0.0 installation media from my flash drive I can not see drives in the RAID5 set I created. Questions: Is there a VIB file for the RAID controller I can use? I have found one article at http://www.intel.com/support/motherboards/server/sb/CS-033313.htm on getting RAID to work with some Intel controllers, it lists 9 integrated RAID modules it is comptabile with. However, there is no mention of the X79 chipset.

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  • Uninstall mysql completely windows 7

    - by cestmoimarin
    Greetings, I understand that this questions has been asked twice. However the answer is not there. I've removed all mysql in registry via regedit that I could find. I made programdata folder visible, deleted mysql folder that's there. Windows 7 doesn't have a very good 'grep' equivalent that I could use. I tried using powershell to find any hidden files but it requires digital signatures which I do not know how to create. Besides windows restore, is there any other way I can force my old 'invisible' mysql 5.1.40 to disappear? I want to try and install mysql via other ways, I'm not sure how to use cmake though to compile the code.

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  • Please guide this self-taught Web Developer.

    - by ChickenPuke
    One of the major regrets in life is that I didn't do something with my introversion. I didn't manage to get past the first year of college because of that. I have chosen the path where there are no video games and other time sinks, all I have is the internet to quench my thirst of learning the ins and outs of the field of Web Developing/Designing. Though currently, I'm taking a Web Design Associate course at one of the best Computer Arts and this is the last month of the class. Even though I'm still a sapling, I love this field so much. So basically, At school I'm learning web design while at home I'm teaching myself web-developing. First thing first, returning to college seems impossible at the moment because of some financial problems. I'm pretty comfortable with CSS and HTML and I'm into PHP/MySQL at the moment. Could you please provide me a web-development Curriculum to follow. And do I need to learn about the theories behind? And I think I'm still young(I'm 18 at the time of writing). Is it a good thing or bad thing for choosing this path? I'm glad with my decision but in all honesty, I'm worrying about my future and employment because I'm an undergrad, coming from a country where companies are degree b!tches, it saddens me so. Thank you. (My questions are the bold parts. )

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  • What popular "best practices" are not always best, and why?

    - by SnOrfus
    "Best practices" are everywhere in our industry. A Google search on "coding best practices" turns up nearly 1.5 million results. The idea seems to bring comfort to many; just follow the instructions, and everything will turn out fine. When I read about a best practice - for example, I just read through several in Clean Code recently - I get nervous. Does this mean that I should always use this practice? Are there conditions attached? Are there situations where it might not be a good practice? How can I know for sure until I've learned more about the problem? Several of the practices mentioned in Clean Code did not sit right with me, but I'm honestly not sure if that's because they're potentially bad, or if that's just my personal bias talking. I do know that many prominent people in the tech industry seem to think that there are no best practices, so at least my nagging doubts place me in good company. The number of best practices I've read about are simply too numerous to list here or ask individual questions about, so I would like to phrase this as a general question: Which coding practices that are popularly labeled as "best practices" can be sub-optimal or even harmful under certain circumstances? What are those circumstances and why do they make the practice a poor one? I would prefer to hear about specific examples and experiences.

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  • Performance and Optimization Isn’t Evil

    - by Reed
    Donald Knuth is a fairly amazing guy.  I consider him one of the most influential contributors to computer science of all time.  Unfortunately, most of the time I hear his name, I cringe.  This is because it’s typically somebody quoting a small portion of one of his famous statements on optimization: “premature optimization is the root of all evil.” I mention that this is only a portion of the entire quote, and, as such, I feel that Knuth is being quoted out of context.  Optimization is important.  It is a critical part of every software development effort, and should never be ignored.  A developer who ignores optimization is not a professional.  Every developer should understand optimization – know what to optimize, when to optimize it, and how to think about code in a way that is intelligent and productive from day one. I want to start by discussing my own, personal motivation here.  I recently wrote about a performance issue I ran across, and was slammed by multiple comments and emails that effectively boiled down to: “You’re an idiot.  Premature optimization is the root of all evil.  This doesn’t matter.”  It didn’t matter that I discovered this while measuring in a profiler, and that it was a portion of my code base that can take “many hours to complete.”  Even so, multiple people instantly jump to “it’s premature – it doesn’t matter.” This is a common thread I see.  For example, StackOverflow has many pages of posts with answers that boil down to (mis)quoting Knuth.  In fact, just about any question relating to a performance related issue gets this quote thrown at it immediately – whether it deserves it or not.  That being said, I did receive some positive comments and emails as well.  Many people want to understand how to optimize their code, approaches to take, tools and techniques they can use, and any other advice they can discover. First, lets get back to Knuth – I mentioned before that Knuth is being quoted out of context.  Lets start by looking at the entire quote from his 1974 paper Structured Programming with go to Statements: “We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Yet we should not pass up our opportunities in that critical 3%. A good programmer will not be lulled into complacency by such reasoning, he will be wise to look carefully at the critical code; but only after that code has been identified.” Ironically, if you read Knuth’s original paper, this statement was made in the middle of a discussion of how Knuth himself had changed how he approaches optimization.  It was never a statement saying “don’t optimize”, but rather, “optimizing intelligently provides huge advantages.”  His approach had three benefits: “a) it doesn’t take long” … “b) the payoff is real”, c) you can “be less efficient in the other parts of my programs, which therefore are more readable and more easily written and debugged.” Looking at Knuth’s premise here, and reading that section of his paper, really leads to a few observations: Optimization is important  “he will be wise to look carefully at the critical code” Normally, 3% of your code – three lines out of every 100 you write, are “critical code” and will require some optimization: “we should not pass up our opportunities in that critical 3%” Optimization, if done well, should not be time consuming: “it doesn’t take long” Optimization, if done correctly, provides real benefits: “the payoff is real” None of this is new information.  People who care about optimization have been discussing this for years – for example, Rico Mariani’s Designing For Performance (a fantastic article) discusses many of the same issues very intelligently. That being said, many developers seem unable or unwilling to consider optimization.  Many others don’t seem to know where to start.  As such, I’m going to spend some time writing about optimization – what is it, how should we think about it, and what can we do to improve our own code.

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  • DirectX Unproject troubles

    - by pivotnig
    I have an orthographic projection and I try to unproject a point from screen space. Following are the view and projection matrices: var w2 = ScreenWidthInPixels/2; var h2 = ScreenHeightInPixels/2; view = Matrix.LookAtLH(new Vector3(0, 0, -1), new Vector3(0, 0, 0), Vector3.UnitY); proj = Matrix.OrthoOffCenterLH(-w2, w2, -h2, h2, 0.1f, 10f); Here is how I unproject a Point p, the point is given in screen pixels: var m = Vector3.Unproject(p, 0, 0, ScreenWidthInPixels, ScreenHeightInPixels, 0.1f, 10f, // znear and zfar view *proj); My code doesn't work, the matrix m contains only Nan. When I try to invert view * proj I get back a Matrix with only zeros. So I suspect my problem has something to do with the orthographic projection matrix. Here are my questions: Could the problem be caused by an underflow due to the large values in the OrthoOffCenterLH projection? What parameters do I have to pass for x,y,width,height in Unproject(...)? What significance has the minZ and maxZ parameter in Unproject(...)? Does it matter what I pass for p.Z in Unproject(...)?

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  • How HP D2700 disk enclosure is monitored for alarms via SNMP

    - by VSAC
    We have HP D2700 disk enclosure and we would like to monitor D2700 (connected to HP Proliant DL360G8) for alarms.I have following questions regarding this. What are the options available for reporting D2700 hardware alarms (disk failure, power failure) via SNMP? We understand the D2700 to have an Ethernet interface for controller A and B and alarms are available via SNMP via this interface. Can anyone provide the actual alarms via this interface? (MIB and alarm list) As we have a number of D2700’s and would like to minimize the number of physical connections to the switch and associated IP addresses; Is there a mechanism to monitor the D2700 from the SCSI connected HPDL360 and raise SNMP alarms from the DL360 for hardware failures on the D2700? If so can anyone provide details and the actual alarms and MIB via this mechanism? Thanks!

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  • Amazon EC2 EBS volume scheduled backup/snapshots using puppet

    - by Ehrann Mehdan
    I am not a Linux admin, although I wish I was, and I have seen these questions Amazon EC2 Backup Strategy Amazon EC2 + EBS:: Regular backup plan? Simple Backup Strategy for Amazon EC2 instances / volumes? And this suggestion http://alestic.com/2009/09/ec2-consistent-snapshot I tried using command line + crontab (the command line works, but crontab for some reason, doesn't) But I'm still pretty lost, all I want is an automated, rolling backup of my amazon EC2 (EBS) data (by rolling I mean keep 3-4 weeks back, but delete old snapshots as new ones come for cost control) And as things usually go, if there is something that is hard and painful, someone creates a solution for it. My question is simple, is there a way using a tool like Puppet to do it without a painful learning curve? (or via other tools like http://ylastic.com) If yes, how?

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  • Outlook Calendar Error "The attachment size exceeds the allowable limit", even when there is no attachment

    - by Laura Kane-Punyon
    I have an outlook meeting series that occurs weekly. Every week, I open the current occurrence, attach the current week’s meeting materials and send an update to the invites. I have done this for the same meeting series for several years. Recently, I started to run into a problem where every time I try to update or cancel a meeting occurrence I received the error “the attachment size exceeds the allowable limit” regardless of whether or not I have an attachment. I am not even able to cancel the series in order to start fresh. I have 2 questions regarding this issue: Is there any way to send attachments on the occurrence of a meeting invite without running into this issue? Is there any way to remove this meeting series?

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  • SQL SERVER – Difference Between DATETIME and DATETIME2 – WITH GETDATE

    - by pinaldave
    Earlier I wrote blog post SQL SERVER – Difference Between GETDATE and SYSDATETIME which inspired me to write SQL SERVER – Difference Between DATETIME and DATETIME2. Now earlier two blog post inspired me to write this blog post (and 4 emails and 3 reads from readers). I previously populated DATETIME and DATETIME2 field with SYSDATETIME, which gave me very different behavior as SYSDATETIME was rounded up/down for the DATETIME datatype. I just ran the same experiment but instead of populating SYSDATETIME in this script I will be using GETDATE function. DECLARE @Intveral INT SET @Intveral = 10000 CREATE TABLE #TimeTable (FirstDate DATETIME, LastDate DATETIME2) WHILE (@Intveral > 0) BEGIN INSERT #TimeTable (FirstDate, LastDate) VALUES (GETDATE(), GETDATE()) SET @Intveral = @Intveral - 1 END GO SELECT COUNT(DISTINCT FirstDate) D_FirstDate, COUNT(DISTINCT LastDate) D_LastDate FROM #TimeTable GO SELECT DISTINCT a.FirstDate, b.LastDate FROM #TimeTable a INNER JOIN #TimeTable b ON a.FirstDate = b.LastDate GO SELECT * FROM #TimeTable GO DROP TABLE #TimeTable GO Let us run above script and observe the results. You will find that the values of GETDATE which is populated in both the columns FirstDate and LastDate are very much same. This is because GETDATE is of datatype DATETIME and the precision of the GETDATE is smaller than DATETIME2 there is no rounding happening. In other word, this experiment is pointless. I have included this as I got 4 emails and 3 twitter questions on this subject. If your datatype of variable is smaller than column datatype there is no manipulation of data, if data type of variable is larger than column datatype the data is rounded. Reference: Pinal Dave (http://www.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL DateTime, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Introducing Ben Barreth, Community Builder &amp; Software Developer at GWB

    - by Staff of Geeks
    Please extend a warm welcome to Ben Barreth as the new community builder and full-time software developer at Geeks With Blogs. We've been wanting to add some cool features to the site but haven't had the opportunity until now. Adding Ben to the team should give us a big kick in the right direction. Ben has several years of .Net development experience and is heavily involved in the startup community in Kansas City, including the KC Startup Village as well as his own startup initiatives: Homes for Hackers and FreeIdeas.co. He loves working with people even more than coding and is excited to serve the GWB community in any way possible. Ben originally met Matt Watson as a beta tester for Stackify, the software company that gives developers the safe & secure access to troubleshoot in production. Jeff Julian and Matt are old friends and recently decided the site needed new ownership to carry it forward and build the enhancements it deserves. The site management transferred in October and Matt quickly began looking for a full-time community builder to lead the charge. Ben bumped into Matt once again at a Tech Cocktail event at the Boulevard Brewery where Stackify was presenting and an alliance was forged. Yes, the beer really IS that good! Which brings us to the biggest question of all: Where do you want Geeks with Blogs to go next? As a contributor to the GWB community, now is your chance to be heard! What are we missing? Features on our radar: New templates Add a code "formatter" to posts Add categories to blog feeds Re-skin the site and redesign the logo Feel free to contact Ben with further questions and ideas below. We need your help! @BenBarreth [email protected] Cell: 816-332-9770 www.linkedin.com/in/benbarreth

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  • Event on SQL Server 2008 Disk IO and the new Complex Event Processing (StreamInsight) feature in R2

    - by tonyrogerson
    Allan Mitchell and myself are doing a double act, Allan is becoming one of the leading guys in the UK on StreamInsight and will give an introduction to this new exciting technology; on top of that I'll being talking about SQL Server Disk IO - well, "Disk" might not be relevant anymore because I'll be talking about SSD and IOFusion - basically I'll be talking about the underpinnings - making sure you understand and get it right, how to monitor etc... If you've any specific problems or questions just ping me an email [email protected]. To register for the event see: http://sqlserverfaq.com/events/217/SQL-Server-and-Disk-IO-File-GroupsFiles-SSDs-FusionIO-InRAM-DBs-Fragmentation-Tony-Rogerson-Complex-Event-Processing-Allan-Mitchell.aspx 18:15 SQL Server and Disk IOTony Rogerson, SQL Server MVPTony's Blog; Tony on TwitterIn this session Tony will talk about RAID levels, how SQL server writes to and reads from disk, the effect SSD has and will talk about other options for throughput enhancement like Fusion IO. He will look at the effect fragmentation has and how to minimise the impact, he will look at the File structure of a database and talk about what benefits multiple files and file groups bring. We will also touch on Database Mirroring and the effect that has on throughput, how to get a feeling for the throughput you should expect.19:15 Break19:45 Complex Event Processing (CEP)Allan Mitchell, SQL Server MVPhttp://sqlis.com/sqlisStreamInsight is Microsoft’s first foray into the world of Complex Event Processing (CEP) and Event Stream Processing (ESP).  In this session I want to show an introduction to this technology.  I will show how and why it is useful.  I will get us used to some new terminology but best of all I will show just how easy it is to start building your first CEP/ESP application.

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  • Automating XNA Performance Testing?

    - by Grofit
    I was wondering what peoples approaches or thoughts were on automating performance testing in XNA. Currently I am looking at only working in 2d, but that poses many areas where performance can be improved with different implementations. An example would be if you had 2 different implementations of spatial partitioning, one may be faster than another but without doing some actual performance testing you wouldn't be able to tell which one for sure (unless you saw the code was blatantly slow in certain parts). You could write a unit test which for a given time frame kept adding/updating/removing entities for both implementations and see how many were made in each timeframe and the higher one would be the faster one (in this given example). Another higher level example would be if you wanted to see how many entities you can have on the screen roughly without going beneath 60fps. The problem with this is to automate it you would need to use the hidden form trick or some other thing to kick off a mock game and purely test which parts you care about and disable everything else. I know that this isnt a simple affair really as even if you can automate the tests, really it is up to a human to interpret if the results are performant enough, but as part of a build step you could have it run these tests and publish the results somewhere for comparison. This way if you go from version 1.1 to 1.2 but have changed a few underlying algorithms you may notice that generally the performance score would have gone up, meaning you have improved your overall performance of the application, and then from 1.2 to 1.3 you may notice that you have then dropped overall performance a bit. So has anyone automated this sort of thing in their projects, and if so how do you measure your performance comparisons at a high level and what frameworks do you use to test? As providing you have written your code so its testable/mockable for most parts you can just use your tests as a mechanism for getting some performance results... === Edit === Just for clarity, I am more interested in the best way to make use of automated tests within XNA to track your performance, not play testing or guessing by manually running your game on a machine. This is completely different to seeing if your game is playable on X hardware, it is more about tracking the change in performance as your game engine/framework changes. As mentioned in one of the comments you could easily test "how many nodes can I insert/remove/update within QuadTreeA within 2 seconds", but you have to physically look at these results every time to see if it has changed, which may be fine and is still better than just relying on playing it to see if you notice any difference between version. However if you were to put an Assert in to notify you of a fail if it goes lower than lets say 5000 in 2 seconds you have a brittle test as it is then contextual to the hardware, not just the implementation. Although that being said these sort of automated tests are only really any use if you are running your tests as some sort of build pipeline i.e: Checkout - Run Unit Tests - Run Integration Tests - Run Performance Tests - Package So then you can easily compare the stats from one build to another on the CI server as a report of some sort, and again this may not mean much to anyone if you are not used to Continuous Integration. The main crux of this question is to see how people manage this between builds and how they find it best to report upon. As I said it can be subjective but as knowledge will be gained from the answers it seems a worthwhile question.

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