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  • IBM System x3850 X5 TPC-H Benchmark

    - by jchang
    IBM just published a TPC-H SF 1000 result for their x3850 X5 , 4-way Xeon 7560 system featuring a special MAX5 memory expansion board to support 1.5TB memory. In Dec 2010, IBM also published a TPC-H SF1000 for their Power 780 system, 8-way, quad-core, (4 logical processors per physical core). In Feb 2011, Ingres published a TPC-H SF 100 on a 2-way Xeon 5680 for their VectorWise column-store engine (plus enhancements for memory architecture, SIMD and compression). The figure table below shows TPC-H...(read more)

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  • How do I Integrate Production Database Hot Fixes into Shared Database Development model?

    - by TetonSig
    We are using SQL Source Control 3, SQL Compare, SQL Data Compare from RedGate, Mercurial repositories, TeamCity and a set of 4 environments including production. I am working on getting us to a dedicated environment per developer, but for at least the next 6 months we are stuck with a shared model. To summarize our current system, we have a DEV SQL server where developers first make changes/additions. They commit their changes through SQL Source Control to a local hgdev repository. When they execute an hg push to the main repository, TeamCity listens for that and then (among other things) pushes hgdev repository to hgrc. Another TeamCity process listens for that and does a pull from hgrc and deploys the latest to a QA SQL Server where regression and integration tests are run. When those are passed a push from hgrc to hgprod occurs. We do a compare of hgprod to our PREPROD SQL Server and generate deployment/rollback scripts for our production release. Separate from the above we have database Hot Fixes that will need to be applied in between releases. The process there is for our Operations team make changes on the PreProd database, and then after testing, to use SQL Source Control to commit their hot fix changes to hgprod from the PREPROD database, and then do a compare from hgprod to PRODUCTION, create deployment scripts and run them on PRODUCTION. If we were in a dedicated database per developer model, we could simply automatically push hgprod back to hgdev and merge in the hot fix change (through TeamCity monitoring for hgprod checkins) and then developers would pick it up and merge it to their local repository and database periodically. However, given that with a shared model the DEV database itself is the source of all changes, this won't work. Pushing hotfixes back to hgdev will show up in SQL Source Control as being different than DEV SQL Server and therefore we need to overwrite the reposistory with the "change" from the DEV SQL Server. My only workaround so far is to just have OPS assign a developer the hotfix ticket with a script attached and then we run their hotfixes against DEV ourselves to merge them back in. I'm not happy with that solution. Other than working faster to get to dedicated environment, are they other ways to keep this loop going automatically?

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  • C#: LINQ vs foreach - Round 1.

    - by James Michael Hare
    So I was reading Peter Kellner's blog entry on Resharper 5.0 and its LINQ refactoring and thought that was very cool.  But that raised a point I had always been curious about in my head -- which is a better choice: manual foreach loops or LINQ?    The answer is not really clear-cut.  There are two sides to any code cost arguments: performance and maintainability.  The first of these is obvious and quantifiable.  Given any two pieces of code that perform the same function, you can run them side-by-side and see which piece of code performs better.   Unfortunately, this is not always a good measure.  Well written assembly language outperforms well written C++ code, but you lose a lot in maintainability which creates a big techncial debt load that is hard to offset as the application ages.  In contrast, higher level constructs make the code more brief and easier to understand, hence reducing technical cost.   Now, obviously in this case we're not talking two separate languages, we're comparing doing something manually in the language versus using a higher-order set of IEnumerable extensions that are in the System.Linq library.   Well, before we discuss any further, let's look at some sample code and the numbers.  First, let's take a look at the for loop and the LINQ expression.  This is just a simple find comparison:       // find implemented via LINQ     public static bool FindViaLinq(IEnumerable<int> list, int target)     {         return list.Any(item => item == target);     }         // find implemented via standard iteration     public static bool FindViaIteration(IEnumerable<int> list, int target)     {         foreach (var i in list)         {             if (i == target)             {                 return true;             }         }           return false;     }   Okay, looking at this from a maintainability point of view, the Linq expression is definitely more concise (8 lines down to 1) and is very readable in intention.  You don't have to actually analyze the behavior of the loop to determine what it's doing.   So let's take a look at performance metrics from 100,000 iterations of these methods on a List<int> of varying sizes filled with random data.  For this test, we fill a target array with 100,000 random integers and then run the exact same pseudo-random targets through both searches.                       List<T> On 100,000 Iterations     Method      Size     Total (ms)  Per Iteration (ms)  % Slower     Any         10       26          0.00046             30.00%     Iteration   10       20          0.00023             -     Any         100      116         0.00201             18.37%     Iteration   100      98          0.00118             -     Any         1000     1058        0.01853             16.78%     Iteration   1000     906         0.01155             -     Any         10,000   10,383      0.18189             17.41%     Iteration   10,000   8843        0.11362             -     Any         100,000  104,004     1.8297              18.27%     Iteration   100,000  87,941      1.13163             -   The LINQ expression is running about 17% slower for average size collections and worse for smaller collections.  Presumably, this is due to the overhead of the state machine used to track the iterators for the yield returns in the LINQ expressions, which seems about right in a tight loop such as this.   So what about other LINQ expressions?  After all, Any() is one of the more trivial ones.  I decided to try the TakeWhile() algorithm using a Count() to get the position stopped like the sample Pete was using in his blog that Resharper refactored for him into LINQ:       // Linq form     public static int GetTargetPosition1(IEnumerable<int> list, int target)     {         return list.TakeWhile(item => item != target).Count();     }       // traditionally iterative form     public static int GetTargetPosition2(IEnumerable<int> list, int target)     {         int count = 0;           foreach (var i in list)         {             if(i == target)             {                 break;             }               ++count;         }           return count;     }   Once again, the LINQ expression is much shorter, easier to read, and should be easier to maintain over time, reducing the cost of technical debt.  So I ran these through the same test data:                       List<T> On 100,000 Iterations     Method      Size     Total (ms)  Per Iteration (ms)  % Slower     TakeWhile   10       41          0.00041             128%     Iteration   10       18          0.00018             -     TakeWhile   100      171         0.00171             88%     Iteration   100      91          0.00091             -     TakeWhile   1000     1604        0.01604             94%     Iteration   1000     825         0.00825             -     TakeWhile   10,000   15765       0.15765             92%     Iteration   10,000   8204        0.08204             -     TakeWhile   100,000  156950      1.5695              92%     Iteration   100,000  81635       0.81635             -     Wow!  I expected some overhead due to the state machines iterators produce, but 90% slower?  That seems a little heavy to me.  So then I thought, well, what if TakeWhile() is not the right tool for the job?  The problem is TakeWhile returns each item for processing using yield return, whereas our for-loop really doesn't care about the item beyond using it as a stop condition to evaluate. So what if that back and forth with the iterator state machine is the problem?  Well, we can quickly create an (albeit ugly) lambda that uses the Any() along with a count in a closure (if a LINQ guru knows a better way PLEASE let me know!), after all , this is more consistent with what we're trying to do, we're trying to find the first occurence of an item and halt once we find it, we just happen to be counting on the way.  This mostly matches Any().       // a new method that uses linq but evaluates the count in a closure.     public static int TakeWhileViaLinq2(IEnumerable<int> list, int target)     {         int count = 0;         list.Any(item =>             {                 if(item == target)                 {                     return true;                 }                   ++count;                 return false;             });         return count;     }     Now how does this one compare?                         List<T> On 100,000 Iterations     Method         Size     Total (ms)  Per Iteration (ms)  % Slower     TakeWhile      10       41          0.00041             128%     Any w/Closure  10       23          0.00023             28%     Iteration      10       18          0.00018             -     TakeWhile      100      171         0.00171             88%     Any w/Closure  100      116         0.00116             27%     Iteration      100      91          0.00091             -     TakeWhile      1000     1604        0.01604             94%     Any w/Closure  1000     1101        0.01101             33%     Iteration      1000     825         0.00825             -     TakeWhile      10,000   15765       0.15765             92%     Any w/Closure  10,000   10802       0.10802             32%     Iteration      10,000   8204        0.08204             -     TakeWhile      100,000  156950      1.5695              92%     Any w/Closure  100,000  108378      1.08378             33%     Iteration      100,000  81635       0.81635             -     Much better!  It seems that the overhead of TakeAny() returning each item and updating the state in the state machine is drastically reduced by using Any() since Any() iterates forward until it finds the value we're looking for -- for the task we're attempting to do.   So the lesson there is, make sure when you use a LINQ expression you're choosing the best expression for the job, because if you're doing more work than you really need, you'll have a slower algorithm.  But this is true of any choice of algorithm or collection in general.     Even with the Any() with the count in the closure it is still about 30% slower, but let's consider that angle carefully.  For a list of 100,000 items, it was the difference between 1.01 ms and 0.82 ms roughly in a List<T>.  That's really not that bad at all in the grand scheme of things.  Even running at 90% slower with TakeWhile(), for the vast majority of my projects, an extra millisecond to save potential errors in the long term and improve maintainability is a small price to pay.  And if your typical list is 1000 items or less we're talking only microseconds worth of difference.   It's like they say: 90% of your performance bottlenecks are in 2% of your code, so over-optimizing almost never pays off.  So personally, I'll take the LINQ expression wherever I can because they will be easier to read and maintain (thus reducing technical debt) and I can rely on Microsoft's development to have coded and unit tested those algorithm fully for me instead of relying on a developer to code the loop logic correctly.   If something's 90% slower, yes, it's worth keeping in mind, but it's really not until you start get magnitudes-of-order slower (10x, 100x, 1000x) that alarm bells should really go off.  And if I ever do need that last millisecond of performance?  Well then I'll optimize JUST THAT problem spot.  To me it's worth it for the readability, speed-to-market, and maintainability.

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  • Collezioni, taglia/colore, riassortimenti: l'incubo del produttori di moda

    - by antonella.buonagurio(at)oracle.com
    Chiunque lavori  o abbia lavorato nel mondo della moda, sia essa alta o pronta, capi spalla o calzature, conosce bene i problemi che nascono dalle mille combinazioni di taglie, tessuti, modelli e come produrre riducendo al minimo scarti e resi. "Per soddisfare le aspettative dei consumatori sempre più volatile e specifici, i produttori ei distributori devono essere in grado di semplificare la gestione di oggetti complessi multi-attributo," ha detto Lyle Ekdahl, vice presidente del gruppo Oracle, JD Edwards.  

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  • What do you think about starting a reading group?

    - by Imran Omar Bukhsh
    Greetings everyone I know we as software engineers / developers always need to keep learning. I really wanted to start a reading group where people can be reading books and discussing about whatever they read like at the end of every chapter when everyone has finished by a particular time. We could also have like a min. limit of n pages per day for every person that participates in the group. What do you think? Do advise.

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  • Architecture strategies for a complex competition scoring system

    - by mikewassmer
    Competition description: There are about 10 teams competing against each other over a 6-week period. Each team's total score (out of a 1000 total available points) is based on the total of its scores in about 25,000 different scoring elements. Most scoring elements are worth a small fraction of a point and there will about 10 X 25,000 = 250,000 total raw input data points. The points for some scoring elements are awarded at frequent regular time intervals during the competition. The points for other scoring elements are awarded at either irregular time intervals or at just one moment in time. There are about 20 different types of scoring elements. Each of the 20 types of scoring elements has a different set of inputs, a different algorithm for calculating the earned score from the raw inputs, and a different number of total available points. The simplest algorithms require one input and one simple calculation. The most complex algorithms consist of hundreds or thousands of raw inputs and a more complicated calculation. Some types of raw inputs are automatically generated. Other types of raw inputs are manually entered. All raw inputs are subject to possible manual retroactive adjustments by competition officials. Primary requirements: The scoring system UI for competitors and other competition followers will show current and historical total team scores, team standings, team scores by scoring element, raw input data (at several levels of aggregation, e.g. daily, weekly, etc.), and other metrics. There will be charts, tables, and other widgets for displaying historical raw data inputs and scores. There will be a quasi-real-time dashboard that will show current scores and raw data inputs. Aggregate scores should be updated/refreshed whenever new raw data inputs arrive or existing raw data inputs are adjusted. There will be a "scorekeeper UI" for manually entering new inputs, manually adjusting existing inputs, and manually adjusting calculated scores. Decisions: Should the scoring calculations be performed on the database layer (T-SQL/SQL Server, in my case) or on the application layer (C#/ASP.NET MVC, in my case)? What are some recommended approaches for calculating updated total team scores whenever new raw inputs arrives? Calculating each of the teams' total scores from scratch every time a new input arrives will probably slow the system to a crawl. I've considered some kind of "diff" approach, but that approach may pose problems for ad-hoc queries and some aggegates. I'm trying draw some sports analogies, but it's tough because most games consist of no more than 20 or 30 scoring elements per game (I'm thinking of a high-scoring baseball game; football and soccer have fewer scoring events per game). Perhaps a financial balance sheet analogy makes more sense because financial "bottom line" calcs may be calculated from 250,000 or more transactions. Should I be making heavy use of caching for this application? Are there any obvious approaches or similar case studies that I may be overlooking?

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  • What's the best book for coding conventions?

    - by Joschua
    What's the best book about coding conventions (and perhaps design patterns), that you highly recommend (at best code samples in Python, C++ or Java)? It would be good, if the book (or just another) also covers the topics project management and agile software development if appropriate (for example how projects fail through spaghetti code). I will accept the answer with the book(s) (maximum two books per answer, please), that looks the most interesting, because the reading might take a while :)

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  • The First Annual Crappy Code Games

    - by Testas
    SQLBits announced some super-exciting news! A tie-up with our platinum sponsor, Fusion-io. Together we'll be running a series of events called "The Crappy Code Games" where SQL Server developers will compete to write the worst-performing code and win some very cool prizes including:   •        Gold: A hands-on, high performance flying day for two at Ultimate High plus Fusion-io flight jackets•        Silver: One day racing experience at Palmer Sports where you will drive seven different high performance cars•        Bronze: Pure Tech Racing 10 person package at PTR’s F1 racing facility includes FI tees, food and drinks. …plus iPods, Windows Mobile phones, X-box 360s, t-shirts and much more. There will be two qualifying events in Manchester on March 17th and London on March 31st, and the third qualifier as well as the grand finale will be held in the evening of Thursday April 7th at SQLBits. And if that isn’t cool enough, Fusion-io's Chief Scientist Steve Wozniak (yes, that Steve Wozniak, tech industry legend and co-founder of Apple) will be on hand in Brighton to hand out the prizes! If you'd like to take part you'll need to register, and since places are limited we recommend you do so right away. For more details and to register, go to http://www.crappycodegames.com/ The Games: In conjunction with SQL Bits, dbA-thletes (that’s you) will compete  head-to-head in one of three separate qualifying events to be held in Manchester, London and Brighton.  Four separate SQL  rounds make up the evening’s Games, and will challenge you to write code that pushes the boundaries of SQL performance.  The four events are: ?  The High Jump: Generate the highest I/O per second ?  The 100 m dash: Cumulative highest number of I/O’s in 60 seconds ?  The SSIS-athon: Load one billion row fact table in the shortest time ?  The Marathon: Generate the highest MB per second in 60 seconds

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  • Encrypted Hidden Redux : Let's Get Salty

    - by HeartattacK
    In this article, Ashic Mahtab shows an elegant, reusable and unobtrusive way in which to persist sensitive data to the browser in hidden inputs and restoring them on postback without needing to change any code in controllers or actions. The approach is an improvement of his previous article and incorporates a per session salt during encryption. Note: Cross posted from Heartysoft.com. Permalink

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  • SEO & SEM Long Tail Keyword Marketing Strategy

    Long tail marketing strategies for SEO & SEM often return higher conversion rates by up to 200% as compared to short tail generic keyword terms. These long tail keyword terms can be extremely profitable for SEM (search engine marketing) in terms of lower cost or bid for keywords and larger returns on pay per click investment.

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  • Apache on Windows - splitting vHost logs

    - by Cylindric
    I have a Windows Server 2008 running Apache, and it will be hosting several virtual hosts. I'd rather not use the logrotate tool (|bin/logrotate), as it seems create significant extra overhead with all the processes. Is there a simple Windows alternative to get the log entries from a combined log file split into several per-site files? Preferably with custom output directories, but that is optional.

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  • Siegertypen unter sich - beim Oracle Partner Day in Frankfurt

    - by A&C Redaktion
    WIR WARTEN AUF SIE! ORACLE PARTNER DAY - 29. OKTOBER 2012 Erfolg hat immer eine sportliche Komponente – Ehrgeiz, Wissen und Durchhaltevermögen sind mit entscheidend, um in die nächste Runde zu kommen. Sie als Partner können jetzt in einer neuen Liga spielen, denn ab sofort haben Sie die Möglichkeit, das gesamte Oracle Red Stack Produktportfolio – Software, Hardware und Applications – zu verkaufen. An diesem Tag erwarten Sie: David Callaghan, Senior Vice President EMEA Alliances & Channels Jürgen Kunz, Senior Vice President Northern Europe & Country Leader Germany Silvia Kaske, Senior Director Alliances & Channels Europe North Christian Werner, Senior Director Alliances & Channels Germany Sie haben Fragen an die Executives? Im Oracle Leaders Panel (ab 17 Uhr) werden diese live beantwortet. Schicken Sie uns Ihre Fragen einfach zu: per SMS an +49 176 84879149, per Email, via Facebook oder über Twitter.Das neue A&C Coaching Team steht. Sind Sie dabei?Spitzenleistung braucht eine breite Basis: die neue Mannschaftsaufstellung lernen Sie vor Ort live kennen. Holen Sie sich Unterstützung. Und profitieren Sie von einem exzellenten Netzwerk – Ihrer Partnerschaft auf dem Weg nach oben. Steigen Sie mit Alliances & Channels gemeinsam in die neue Liga auf, das mit seinem Produktportfolio am Markt seinesgleichen sucht. Nur noch wenige Tage bis zum Oracle Partner Day 2012!Aber noch nicht zu spät, um sich zu registrieren. Machen Sie sich jetzt auf den Weg an die Spitze! Melden Sie sich hier gleich an.Noch besteht die Möglichkeit für ein 1:1 Meeting mit ausgewählten Oracle Managern vor Ort. Kreuzen Sie Ihren Wunschpartner an, mit dem Sie sich gerne austauschen möchten. Sie machen den Test. Wir zahlen die Testgebühr!Nutzen Sie die Gelegenheit, sich direkt zum OPN Implementation Specialist zu akkreditieren! Melden Sie sich jetzt zum offiziellen Implementierungstest beim Testcenter Pearson Vue vor Ort beim Oracle Partner Day an. Wählen Sie Ihre Fachbereiche aus Fusion Middleware, Applications, Hardware, Datenbank und gehen Sie als Implementierungsspezialist nach Hause. Jetzt kommt der Ball ins Rollen! Sportlicher Abschluss in der Commerzbank ArenaNach den fachlichen Themen des Tages wollen wir den Abend in sportlichem Rahmen mit Ihnen ausklingen lassen. Die „Oracle Red Stack Arena Sport Challenge“ hält für Sie einige Überraschungen bereit. Nur so viel sei verraten: Es wird auch ein mit QR-Codes verknüpfes Gewinnspiel mit attraktiven Preisen geben. Bereiten Sie Ihr Smartphone dafür vor. Wir freuen uns auf Sie!

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  • Siegertypen unter sich - beim Oracle Partner Day in Frankfurt

    - by A&C Redaktion
    WIR WARTEN AUF SIE! ORACLE PARTNER DAY - 29. OKTOBER 2012 Erfolg hat immer eine sportliche Komponente – Ehrgeiz, Wissen und Durchhaltevermögen sind mit entscheidend, um in die nächste Runde zu kommen. Sie als Partner können jetzt in einer neuen Liga spielen, denn ab sofort haben Sie die Möglichkeit, das gesamte Oracle Red Stack Produktportfolio – Software, Hardware und Applications – zu verkaufen. An diesem Tag erwarten Sie: David Callaghan, Senior Vice President EMEA Alliances & Channels Jürgen Kunz, Senior Vice President Northern Europe & Country Leader Germany Silvia Kaske, Senior Director Alliances & Channels Europe North Christian Werner, Senior Director Alliances & Channels Germany Sie haben Fragen an die Executives? Im Oracle Leaders Panel (ab 17 Uhr) werden diese live beantwortet. Schicken Sie uns Ihre Fragen einfach zu: per SMS an +49 176 84879149, per Email, via Facebook oder über Twitter.Das neue A&C Coaching Team steht. Sind Sie dabei?Spitzenleistung braucht eine breite Basis: die neue Mannschaftsaufstellung lernen Sie vor Ort live kennen. Holen Sie sich Unterstützung. Und profitieren Sie von einem exzellenten Netzwerk – Ihrer Partnerschaft auf dem Weg nach oben. Steigen Sie mit Alliances & Channels gemeinsam in die neue Liga auf, das mit seinem Produktportfolio am Markt seinesgleichen sucht. Nur noch wenige Tage bis zum Oracle Partner Day 2012!Aber noch nicht zu spät, um sich zu registrieren. Machen Sie sich jetzt auf den Weg an die Spitze! Melden Sie sich hier gleich an.Noch besteht die Möglichkeit für ein 1:1 Meeting mit ausgewählten Oracle Managern vor Ort. Kreuzen Sie Ihren Wunschpartner an, mit dem Sie sich gerne austauschen möchten. Sie machen den Test. Wir zahlen die Testgebühr!Nutzen Sie die Gelegenheit, sich direkt zum OPN Implementation Specialist zu akkreditieren! Melden Sie sich jetzt zum offiziellen Implementierungstest beim Testcenter Pearson Vue vor Ort beim Oracle Partner Day an. Wählen Sie Ihre Fachbereiche aus Fusion Middleware, Applications, Hardware, Datenbank und gehen Sie als Implementierungsspezialist nach Hause. Jetzt kommt der Ball ins Rollen! Sportlicher Abschluss in der Commerzbank ArenaNach den fachlichen Themen des Tages wollen wir den Abend in sportlichem Rahmen mit Ihnen ausklingen lassen. Die „Oracle Red Stack Arena Sport Challenge“ hält für Sie einige Überraschungen bereit. Nur so viel sei verraten: Es wird auch ein mit QR-Codes verknüpfes Gewinnspiel mit attraktiven Preisen geben. Bereiten Sie Ihr Smartphone dafür vor. Wir freuen uns auf Sie!

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  • 301 redirect blogspot to an existing domain?

    - by JK01
    Is it possible to redirect a blogspot site to an existing URL? Note that I don't want to buy a new domain and tell blogspot to use that, eg as per this question: How to have a blogspot blog in my domain?. Instead I am trying to 301 redirect to an existing website in order to combine the website and the blog in one place. So it needs to be: 301 example.blogspot.com/post to example.com/blog/post

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  • Career path to get into computer science research

    - by srinathhs
    I taught this question will be appropriate to ask here. I am currently a software engineer working mainly on Java stuff , along with some android. My question : I want to be a researcher in "computer science" down the line 6 - 7 yrs, what do you folks suggest should be my path to reach it ? Constraints : I cannot cannot do formal MS or PHD , I simply cant afford it. I can dedicate certain amount of time per day to study and research.

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  • ISE (Germany) and Techdata Azlan: Exadata win over IBM at Immonet

    - by Javier Puerta
    Immonet, a subsidiary of German media company Axel Springer, provides cross-media real estate marketing via the Internet, newspapers, and other channels. The Immonet.de website is the number two German property portal with approximately 1.8 million unique visitors per month and over than 950,000 current online offerings. Read here how ISE solved with Exadata the performance problems that Immonet was experiencing.

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  • Sudden increase in spam report from Yahoo

    - by lulalala
    Recently we experienced a sudden increase in spam reports, and all of them come from Yahoo email addresses. We see lots of registration confirmation email got marked as spam. We also saw people marking mails as spam and then opened it and clicked on the confirmation link. We send around 150 registration emails a day, and currently sees 2 spam reports from these per day. Previously spam reports once come once a month. We use Sendgrid to send emails.

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  • Quick Poll: Certification Information Preferences

    - by Paul Sorensen
    We're starting a new "quick poll" series so that we can better learn about you - our technical professionals who are either already Oracle certified or working on earning an Oracle credential. We aim to keep them short (~1 minute to answer) so that you'll share your opinion.This week we want to know how you prefer to get your information about Oracle Certification:TAKE THE QUICK POLLNOTE: You can only take the survey once per machine. (if you try a second time it may redirect you to an external website)

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  • GDL Presents: Women Techmakers with Pixel Qi

    GDL Presents: Women Techmakers with Pixel Qi Jean Wang sits down with 2011 Anita Borg "Woman of Vision" Award for Innovation winner Mary Lou Jepsen of Pixel Qi to discuss overcoming technical challenges in hardware, drawing on Mary Lou's experience leading the engineering and architectural design of the $100 laptops that inspired the One Laptop Per Child (OLPC) organization. Hosts: Jean Wang - Lead Hardware Engineer for Project Glass | Vivian Cromwell - Manager, Global Chrome Developer Relations Guest: Mary Lou Jepsen - CEO and Founder, Pixel Qi From: GoogleDevelopers Views: 0 0 ratings Time: 01:00:00 More in Science & Technology

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  • Github Organization Repositories, Issues, Multiple Developers, and Forking - Best Workflow Practices

    - by Jim Rubenstein
    A weird title, yes, but I've got a bit of ground to cover I think. We have an organization account on github with private repositories. We want to use github's native issues/pull-requests features (pull requests are basically exactly what we want as far as code reviews and feature discussions). We found the tool hub by defunkt which has a cool little feature of being able to convert an existing issue to a pull request, and automatically associate your current branch with it. I'm wondering if it is best practice to have each developer in the organization fork the organization's repository to do their feature work/bug fixes/etc. This seems like a pretty solid work flow (as, it's basically what every open source project on github does) but we want to be sure that we can track issues and pull requests from ONE source, the organization's repository. So I have a few questions: Is a fork-per-developer approach appropriate in this case? It seems like it could be a little overkill. I'm not sure that we need a fork for every developer, unless we introduce developers who don't have direct push access and need all their code reviewed. In which case, we would want to institute a policy like that, for those developers only. So, which is better? All developers in a single repository, or a fork for everyone? Does anyone have experience with the hub tool, specifically the pull-request feature? If we do a fork-per-developer (or even for less-privileged devs) will the pull-request feature of hub operate on the pull requests from the upstream master repository (the organization's repository?) or does it have different behavior? EDIT I did some testing with issues, forks, and pull requests and found that. If you create an issue on your organization's repository, then fork the repository from your organization to your own github account, do some changes, merge to your fork's master branch. When you try to run hub -i <issue #> you get an error, User is not authorized to modify the issue. So, apparently that work flow won't work.

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  • High Salaried Investment Banking Jobs for Developers — What are the pitfalls?

    - by Jaywalker
    This question might make more sense to somebody having multi-threaded programming experience in Java/ C++ with some job experience in London / Singapore. There is a huge market of Investment Banking development jobs with astonishingly high salaries (sometimes more than 100K pounds per year). Can someone with experience as a front office/trading developer tell what are the requirements to land this type job? What are the downside that i should be ready for?

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  • Guide to MySQL & NoSQL, Webinar Q&A

    - by Mat Keep
    0 0 1 959 5469 Homework 45 12 6416 14.0 Normal 0 false false false EN-US JA X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:Cambria; mso-ascii-font-family:Cambria; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Cambria; mso-hansi-theme-font:minor-latin; mso-ansi-language:EN-US;} Yesterday we ran a webinar discussing the demands of next generation web services and how blending the best of relational and NoSQL technologies enables developers and architects to deliver the agility, performance and availability needed to be successful. Attendees posted a number of great questions to the MySQL developers, serving to provide additional insights into areas like auto-sharding and cross-shard JOINs, replication, performance, client libraries, etc. So I thought it would be useful to post those below, for the benefit of those unable to attend the webinar. Before getting to the Q&A, there are a couple of other resources that maybe useful to those looking at NoSQL capabilities within MySQL: - On-Demand webinar (coming soon!) - Slides used during the webinar - Guide to MySQL and NoSQL whitepaper  - MySQL Cluster demo, including NoSQL interfaces, auto-sharing, high availability, etc.  So here is the Q&A from the event  Q. Where does MySQL Cluster fit in to the CAP theorem? A. MySQL Cluster is flexible. A single Cluster will prefer consistency over availability in the presence of network partitions. A pair of Clusters can be configured to prefer availability over consistency. A full explanation can be found on the MySQL Cluster & CAP Theorem blog post.  Q. Can you configure the number of replicas? (the slide used a replication factor of 1) Yes. A cluster is configured by an .ini file. The option NoOfReplicas sets the number of originals and replicas: 1 = no data redundancy, 2 = one copy etc. Usually there's no benefit in setting it >2. Q. Interestingly most (if not all) of the NoSQL databases recommend having 3 copies of data (the replication factor).    Yes, with configurable quorum based Reads and writes. MySQL Cluster does not need a quorum of replicas online to provide service. Systems that require a quorum need > 2 replicas to be able to tolerate a single failure. Additionally, many NoSQL systems take liberal inspiration from the original GFS paper which described a 3 replica configuration. MySQL Cluster avoids the need for a quorum by using a lightweight arbitrator. You can configure more than 2 replicas, but this is a tradeoff between incrementally improved availability, and linearly increased cost. Q. Can you have cross node group JOINS? Wouldn't that run into the risk of flooding the network? MySQL Cluster 7.2 supports cross nodegroup joins. A full cross-join can require a large amount of data transfer, which may bottleneck on network bandwidth. However, for more selective joins, typically seen with OLTP and light analytic applications, cross node-group joins give a great performance boost and network bandwidth saving over having the MySQL Server perform the join. Q. Are the details of the benchmark available anywhere? According to my calculations it results in approx. 350k ops/sec per processor which is the largest number I've seen lately The details are linked from Mikael Ronstrom's blog The benchmark uses a benchmarking tool we call flexAsynch which runs parallel asynchronous transactions. It involved 100 byte reads, of 25 columns each. Regarding the per-processor ops/s, MySQL Cluster is particularly efficient in terms of throughput/node. It uses lock-free minimal copy message passing internally, and maximizes ID cache reuse. Note also that these are in-memory tables, there is no need to read anything from disk. Q. Is access control (like table) planned to be supported for NoSQL access mode? Currently we have not seen much need for full SQL-like access control (which has always been overkill for web apps and telco apps). So we have no plans, though especially with memcached it is certainly possible to turn-on connection-level access control. But specifically table level controls are not planned. Q. How is the performance of memcached APi with MySQL against memcached+MySQL or any other Object Cache like Ecache with MySQL DB? With the memcache API we generally see a memcached response in less than 1 ms. and a small cluster with one memcached server can handle tens of thousands of operations per second. Q. Can .NET can access MemcachedAPI? Yes, just use a .Net memcache client such as the enyim or BeIT memcache libraries. Q. Is the row level locking applicable when you update a column through memcached API? An update that comes through memcached uses a row lock and then releases it immediately. Memcached operations like "INCREMENT" are actually pushed down to the data nodes. In most cases the locks are not even held long enough for a network round trip. Q. Has anyone published an example using something like PHP? I am assuming that you just use the PHP memcached extension to hook into the memcached API. Is that correct? Not that I'm aware of but absolutely you can use it with php or any of the other drivers Q. For beginner we need more examples. Take a look here for a fully worked example Q. Can I access MySQL using Cobol (Open Cobol) or C and if so where can I find the coding libraries etc? A. There is a cobol implementation that works well with MySQL, but I do not think it is Open Cobol. Also there is a MySQL C client library that is a standard part of every mysql distribution Q. Is there a place to go to find help when testing and/implementing the NoSQL access? If using Cluster then you can use the [email protected] alias or post on the MySQL Cluster forum Q. Are there any white papers on this?  Yes - there is more detail in the MySQL Guide to NoSQL whitepaper If you have further questions, please don’t hesitate to use the comments below!

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  • Scrum and Google Docs burndown chart

    - by Michal Minicki
    There is a tutorial on how to create a burndown chart for Scrum in the Google Docs application: http://www.scrumology.net/2011/05/03/how-to-create-a-burndown-chart-in-google-docs/ The problem I see with it though is, it has only a place to update progress once per sprint but the burndown is supposed to be updated with daily progress, right? How can one modify this chart to be able to put daily progress on it?

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  • % new visitor vs. % returning visitor

    - by Torben Gundtofte-Bruun
    I'm not sure how to interpret the results in Google Analytics. I understand that some metrics should be high, and some should be low. But this one I don't get: % new visitor vs. % returning visitor: It's good that users are returning, but surely it's also good to get new, fresh visitors. How do I evaluate this %-vs-% ratio? The higher the better: visits unique visitors pageviews pages per visit avg. visit duration The lower the better: bounce rate drop-offs

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