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  • Never update systems tables directly - a study in Agent job scheduling

    It is often recommended that system tables should not be updated directly. Presenting a case in point built around nightly job configuration in order to demonstrate the possible issues with updating system tables directly. What can SQL Monitor 3.2 monitor?Whatever you think is most important. Use custom metrics to monitor and alert on data that's most important for your environment. Find out more.

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  • Columnstore Case Study #1: MSIT SONAR Aggregations

    - by aspiringgeek
    Preamble This is the first in a series of posts documenting big wins encountered using columnstore indexes in SQL Server 2012 & 2014.  Many of these can be found in this deck along with details such as internals, best practices, caveats, etc.  The purpose of sharing the case studies in this context is to provide an easy-to-consume quick-reference alternative. Why Columnstore? If we’re looking for a subset of columns from one or a few rows, given the right indexes, SQL Server can do a superlative job of providing an answer. If we’re asking a question which by design needs to hit lots of rows—DW, reporting, aggregations, grouping, scans, etc., SQL Server has never had a good mechanism—until columnstore. Columnstore indexes were introduced in SQL Server 2012. However, they're still largely unknown. Some adoption blockers existed; yet columnstore was nonetheless a game changer for many apps.  In SQL Server 2014, potential blockers have been largely removed & they're going to profoundly change the way we interact with our data.  The purpose of this series is to share the performance benefits of columnstore & documenting columnstore is a compelling reason to upgrade to SQL Server 2014. App: MSIT SONAR Aggregations At MSIT, performance & configuration data is captured by SCOM. We archive much of the data in a partitioned data warehouse table in SQL Server 2012 for reporting via an application called SONAR.  By definition, this is a primary use case for columnstore—report queries requiring aggregation over large numbers of rows.  New data is refreshed each night by an automated table partitioning mechanism—a best practices scenario for columnstore. The Win Compared to performance using classic indexing which resulted in the expected query plan selection including partition elimination vs. SQL Server 2012 nonclustered columnstore, query performance increased significantly.  Logical reads were reduced by over a factor of 50; both CPU & duration improved by factors of 20 or more.  Other than creating the columnstore index, no special modifications or tweaks to the app or databases schema were necessary to achieve the performance improvements.  Existing nonclustered indexes were rendered superfluous & were deleted, thus mitigating maintenance challenges such as defragging as well as conserving disk capacity. Details The table provides the raw data & summarizes the performance deltas. Logical Reads (8K pages) CPU (ms) Durn (ms) Columnstore 160,323 20,360 9,786 Conventional Table & Indexes 9,053,423 549,608 193,903 ? x56 x27 x20 The charts provide additional perspective of this data.  "Conventional vs. Columnstore Metrics" document the raw data.  Note on this linear display the magnitude of the conventional index performance vs. columnstore.  The “Metrics (?)” chart expresses these values as a ratio. Summary For DW, reports, & other BI workloads, columnstore often provides significant performance enhancements relative to conventional indexing.  I have documented here, the first in a series of reports on columnstore implementations, results from an initial implementation at MSIT in which logical reads were reduced by over a factor of 50; both CPU & duration improved by factors of 20 or more.  Subsequent features in this series document performance enhancements that are even more significant. 

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  • Case study: LOREX Technology Increases Website Traffic 90% with Oracle ATG

    - by Richard Lefebvre
    LOREX Technology Increases Website Traffic 90% by Enhancing the Online Customer Experience with a Flexible E-Commerce Platform LOREX Technology Inc. provides businesses and consumers with advanced video surveillance security products under the LOREX and Digimerge brands. LOREX, which caters to midsize business and consumer markets, is available in thousands of retail locations across North America. The Digimerge division sells its products through security system distributors in North America. Both brands concentrate on the sale of wired, wireless, and IP security surveillance and monitoring equipment, including cameras, digital video recorders, and all-in-one systems. LOREX conducted an extensive search for the right e-commerce platform to address its immediate need for a more intuitive shopping cart interface that could grow along with the company. After reviewing other solutions, including open source, LOREX chose Oracle ATG Web Commerce because it addressed every stage of the buying process and crossed all customer touch points, including the Web, contact center, mobile devices, social media, and its B2B partners’ physical stores. LOREX also found that Oracle ATG Web Commerce’s functionality was more robust than competing options, and it offered an attractive total cost of ownership. “Oracle ATG Web Commerce provided an optimal foundation to support rapid, scalable, long-term business growth while allowing full control of the platform,” said Sufi Khan Sulaiman, director, E-Commerce and Digital, LOREX. Read full story here  

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  • The Evolution of Customer Experience in Retail - a study by Oracle and TCS

    - by Richard Lefebvre
    Two New Studies Point to the Direction Retailers are Taking in their CX Initiatives. Is it the Right Direction? The sheer velocity of change in retailing and customer behavior is forcing retailers to reinvigorate, expand and sharpen their vital Customer Experience (CX) strategies. Customers are becoming increasingly dynamic as they race to embrace the newest digital channels; shop in new ways on mobile devices, including smartphones and tablets, on the Web and in the store; share experiences socially; and interact with their preferred brands in new ways. Retailers are stepping up to their customers as they and their competitors create new modes of customer interaction. Underpinning these changes are vast quantities of customer data as customers flood digital channels and the social sphere. The informed retailer must now understand what their priorities are and what they should be for the future. To better understand this, Tata Consultancy Services (TCS) and Oracle independently launched CX-focused surveys to uncover what retailing leadership found important today. By comparing the results of these two studies together, we can further discover new insights about the industry. Click here to download this informative white paper.

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  • Study Targets Windows 'Hooking' in AV Software

    Microsoft has been working with a security firm investigating a fundamental flaw in antivirus software for Windows....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Performance Tuning Re-indexing and Update Statistics – A Case Study

    Recently we started experiencing a very strange issue in our production reporting environment where the Re-indexing and Update Statistics operation suddenly began taking more than 2 days to complete and was thus causing blockage in the database which in turn caused impairment in application performance. NEW! Take the stress out of .NET deploymentEliminate the risk in deploying manually to live systems using Deployment Manager, the new tool from Red Gate. Try it now.

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  • Help deciding on an area of study for a PhD [closed]

    - by ale
    I am going to start a PhD in about 1 year. My undergraduate degree is in computer science and my master's is in artificial intelligence. I want to get ideas about what's going to be hot in say 5 years i.e. what could I spend 3-4 years studying to potentially have expertise that will be applicable to industry and the computing world ? Impossible to answer factually but some ideas and thoughts would be great. I have narrowed my ideas down to AI (yes, even more AI) and information security. AI seems to becoming popular again but security is always a going to be useful. From a career point of view, if I were to stay working in software development then this might actually be the best move but I've always wanted to do a PhD! Many thanks :).

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  • How/when do you study?

    - by Sergei
    Would be interesting to find out how other sysadmins are educating themselves. I find myself in the need of constantly learning new things. I prefer to spend more time on the subject and know it thoroughly knowing that not doing so will kick me back in the future. This can be frustrating sometimes as it feels that I move too slowly. Our company has account on safari.oreilly.com and I am reading a book or two at any given time. I also read sysadmin related blogs for ideas and tips and to keep myself in the tune with the trends. I cannot do any study at home as I would rather spend my out of work hours with my family plus I find it hard/impossible to study at home due to the inability to concentrate at home. So I mostly study while on the train, luckily my commute time takes up to 2 hours a day. I also read a lot at work and don't feel guilty about it. To fix/implement/plan, I need to have a solid knowledge and if it requires time then this is a part of my job being a sysadmin. There is a joke that says "sysadmin is a person that knows a lot about everytihng and as a result knows nothing" - I think ther is a grain of truth here...

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  • Need Help Scoping a Server to use for study (MCITP Ent Admin + SharePoint 2010)

    - by AVFamily76
    i need to study for mcitp, but i also need to study for sharepoint 2010 i have a poweredge 1850 with two single-core CPUs + two 73G drives - it kills me on electricity, so don't want to use it, and it won't do VT, but it could be one of three boxes for a lab that's cheap, but will cost a lot on electricity i was thinking . . . OPTION #1 Opteron 4170 HE (50 watt chip), 6-core, only two-bills ($200), but the board's are $250, so that's an $800 box, then get another box to dual-boot Win7/Hyper-V on the cheap...? OPTION #2 Used Quad - but how many VM's that are really banging away could it run at same time? (Server 2008r2, SQL 2008r2, Search Server) OPTION #3 Study from books and just get one box that can run two VM's at same time, even if slowly. the last time i had and used a home lab was five years ago when i had a DC, SQL, Exchange and business app box, that's where i got my server skills was just banging on it for four years, but didn't read any books, so now i have to get certified and know the material, and just am not sure how much attention i should pay to the box i use versus the studying time and reading. sorry it's a subjective question, and am obviously open to all sorts of abuse here, but hope you can tell me also how many VM's i can run at the same time given what they'll be doing (SQL and SharePoint FAST search server are resource hungry) thanks!

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  • How to learn to program [on hold]

    - by user94914
    I went to a community college and got a degree in computer science, but I found out I only learn very little about programming. As a result I landed byself a office assistant work (for a year now), I want to study on my own and apply for some internship / very entry level development job. I am wondering how should a person learn to program now? I feel that I might not doing it correctly, I understand everyone has a different approach, but I am really clueless on what to do, as it seems I am 5-10 years away. 1) Read the old college programming textbook cover to cover, learn every single concepts, do all the practice problems and master them (1-2 times until error free). Currently reading this java book 2) Work on any project, keep on googling and reading tutorials (including the books on that specific language). I have been doing 1, but the progress is really slow, about 2-5 pages / hour, over a 1000+ page book, I felt really discouraged. I have a few of them to go through (data struction, analyis algorthim, computer theory, operating system.) I wonder is this the right method to do? I know it is going to take time, but I am hoping to get some advice from current programmers.

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  • The Koyal Group Info Mag News¦Charged building material could make the renewable grid a reality

    - by Chyler Tilton
    What if your cell phone didn’t come with a battery? Imagine, instead, if the material from which your phone was built was a battery. The promise of strong load-bearing materials that can also work as batteries represents something of a holy grail for engineers. And in a letter published online in Nano Letters last week, a team of researchers from Vanderbilt University describes what it says is a breakthrough in turning that dream into an electrocharged reality. The researchers etched nanopores into silicon layers, which were infused with a polyethylene oxide-ionic liquid composite and coated with an atomically thin layer of carbon. In doing so, they created small but strong supercapacitor battery systems, which stored electricity in a solid electrolyte, instead of using corrosive chemical liquids found in traditional batteries. These supercapacitors could store and release about 98 percent of the energy that was used to charge them, and they held onto their charges even as they were squashed and stretched at pressures up to 44 pounds per square inch. Small pieces of them were even strong enough to hang a laptop from—a big, fat Dell, no less. Although the supercapacitors resemble small charcoal wafers, they could theoretically be molded into just about any shape, including a cell phone’s casing or the chassis of a sedan. They could also be charged—and evacuated of their charge—in less time than is the case for traditional batteries. “We’ve demonstrated, for the first time, the simple proof-of-concept that this can be done,” says Cary Pint, an assistant professor in the university’s mechanical engineering department and one of the authors of the new paper. “Now we can extend this to all kinds of different materials systems to make practical composites with materials specifically tailored to a host of different types of applications. We see this as being just the tip of a very massive iceberg.” Pint says potential applications for such materials would go well beyond “neat tech gadgets,” eventually becoming a “transformational technology” in everything from rocket ships to sedans to home building materials. “These types of systems could range in size from electric powered aircraft all the way down to little tiny flying robots, where adding an extra on-board battery inhibits the potential capability of the system,” Pint says. And they could help the world shift to the intermittencies of renewable energy power grids, where powerful batteries are needed to help keep the lights on when the sun is down or when the wind is not blowing. “Using the materials that make up a home as the native platform for energy storage to complement intermittent resources could also open the door to improve the prospects for solar energy on the U.S. grid,” Pint says. “I personally believe that these types of multifunctional materials are critical to a sustainable electric grid system that integrates solar energy as a key power source.”

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  • Any learning/studying material for C/C++ that use game programming as learning context out there?

    - by mac
    As most of game programming is done - I read on this very site - in C/C++ I was wondering if there is any learning/studying material for C/C++ that would target specifically game programming. I am not looking for material about "developing games" or "software architecture for games", but rather for material that uses "game programming" as the CONTEXT for introducing and illustrating C/C++ features, idioms, programming techniques, etc... With a simile: think to the GOF book on design patterns. There, they used "developing a text-editor" as a context for introducing design patterns, but the book is most definitively not a book about "developing text-editors". Thanks in advance for your time and advice! PS: My background: I am a programmer with a solid experience in OO scripting languages and only some experience in C and Assembler (on AVR microcontrollers), so I am thinking to mid-to-advanced level material, rather than tutorials for beginners, although it might be interesting to take a look to the latter ones if nothing else is available.

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  • Targeting specific material by name in the imported model

    - by Aleksander Lenart
    I'm trying to select a particular material in the imported model (via Collada loader) in Three.js. I know this can be done with the getChildByName method but it just doesn't work for me. I couldn't find any working example with this method included, either. What am I doing wrong here? loader = new THREE.ColladaLoader(); loader.load('myModel.dae', function ( collada ) { model = collada.scene; var myMaterial = model.getChildByName( 'materialName', true ); myMaterial.material = new THREE.MeshBasicMaterial( { wireframe: true } ); });

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  • A talk about observer pattern

    - by Martin
    As part of a university course I'm taking, I have to hold a 10 minute talk about the observer pattern. So far these are my points: What is it? (defenition) Polling is an alternative Polling VS Observer When Observer is better When Polling is better (taken from here) A statement that Mediator pattern is worth checking out. (I won't have time to cover it in 10 minutes) I would be happy to hear about: Any suggestions to add something? Another alternative (if exists)

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  • MTN WMS Implementation Story

    - by aditya.agarkar
    MTN is Africa's largest cellular phone company serving millions of customers across 21 countries. MTN uses Oracle WMS to manage its distribution activities and its sizzling growth. Just for perspective, since 2004, Africa has been the fastest growing mobile phone market in the world. If you want to know more about MTN and the WMS Project at MTN, a summarized view of MTN WMS project is here. The WMS Project at MTN was presented at Oracle Open World in 2007. The extensive automation at MTN includes interface with Conveyor for item transport, High Speed Sorter for item routing, Put to Light for packing accuracy, ASRS Carousel/Lift for inventory Security and Storage Optimization, Check Weight Scale for shipping accuracy, Automated Carton Erectors for package creation and Automated Carton Labeling. Subsequent to this presentation and their go-live in 2007, the MTN warehouse has scaled new heights. The volume has grown manifolds (as can be expected in a fast growing cellular market). Oracle WMS has been able to scale very well to the increase in volume, just as it was designed to do. Here are a couple of videos that highlight the WMS operations at MTN:  1) Video Interview with Margaretha Theart (Warehouse Manager at MTN) 2) Automation Video at MTN (Hat tip: Syed Imran) Enjoy!

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  • Investigating a big C++ project from its source code [closed]

    - by user827992
    Possible Duplicate: What is the best method to start understanding BIG project source code? I have a project that I would like to dissect to learn something new from it. This project is about 200 megabytes. For me, it is just impossible to open every cpp and hpp file and read each and every one. I also don't know what is the best approach in this case. Many people on the internet are looking for an UML tool to generate some kind of graph. I think that UML works well when you are starting a project and you want to express the business logic of your classes and methods. In my opinion UML is totally useless when studying a project only from its source code. Also UML is an OO language, in a large sized C++ project I find a lot of stuff that is not an object and can express some other kind of paradigm. Can you name a tool or a class of software that can help with this?

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  • Is it a waste of time to free resources before I exit a process?

    - by Martin
    Let's consider a fictional program that builds a linked list in the heap, and at the end of the program there is a loop that frees all the nodes, and then exits. For this case let's say the linked list is just 500K of memory, and no special space managing is required. Is that a wast of time, because the OS will do that anyway? Will there be a different behavior later? Is that different according to the OS version? I'm mainly interested in UNIX based systems, but any information will be appreciated. I had today my first lesson in OS course and I'm wondering about that now.

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  • Do you know any studies on relation of productivity of a programmer and the workstation used?

    - by Tomasz Blachowicz
    I was wondering if there are any studies (formal or not-so-formal) that show correlation between a developer productivity and the workstation used to develop software. It is often heard as argument that the high spec workstations increase the productivity (or the low spec machines impact productivity to the greater extent). To me it sound reasonable, however I'd like to verify the statement with some studies if such exists. Can you help me with that?

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