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  • On the art of self-promotion

    - by Tony Davis
    I attended Brent Ozar's Building the Fastest SQL Servers session at Tech Ed last week, and found myself engulfed in a 'perfect storm' of excellent technical and presentational skills coupled with an astute awareness of the value of promoting one's work. I spend a lot of time at such events talking to developers and DBAs about the value of blogging and writing articles, and my impression is that some could benefit from a touch less modesty and a little more self-promotion. I sense a reticence in many would-be writers. Is what I have to say important enough? Haven't far more qualified and established commentators, MVPs and so on, already said it? While it's a good idea to pick reasonably fresh and interesting topics, it's more important not to let such fears lead to writer's block. In the eyes of any future employer, your published writing is an extension of your resume. They will not care that a certain MVP knows how to solve problem x, but they will be very interested to see that you have tackled that same problem, and solved it in your own way, and described the process in your own voice. In your current job, your writing is one of the ways you can express to your peers, and to the organization as a whole, the value of what you contribute. Many Developers and DBAs seem to rely on the idea that their work will speak for itself, and that their skill shines out from it. Unfortunately, this isn't always true. Many Development DBAs, for example, will be painfully aware of the massive effort involved in tuning and adding resilience to rapidly developed applications. However, others in the organization who are unaware of what's involved in getting an application that is 'done' ready for production may dismiss such efforts as fussiness or conservatism. At the dark end of the development cycle, chickens come home to roost, but their droppings tend to land on those trying to clear up the mess. My advice is this: next time you fix a bug or improve the resilience or performance of a database or application, make sure that you use team meetings, informal discussions and so on to ensure that people understand what the problem was and what you had to do to fix it. Use your blog to describe, generally, the process you adopted, the resources you used and the insights that came from your work. Encourage your colleagues to do the same. By spreading the art of self-promotion to everyone involved in an IT project, we get a better idea of the extent of the work and the value of the contribution of all the team members. As always, we'd love to hear what you think. This very week, Simple-talk launches its new blogging platform. If any of this has moved you to 'throw your hat into the ring', drop us a mail at [email protected]. Cheers, Tony.

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  • Google I/O 2012 - Computing Map Tiles with Go on App Engine

    Google I/O 2012 - Computing Map Tiles with Go on App Engine Chris Broadfoot, Andrew Gerrand In this talk we use the Maps API and Go on App Engine to build an app to build custom tile sets for Google Maps. The app demonstrates using Go's suitability for computation in the cloud and App Engine's key scalability features, such as Task Queues and Backends. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 1170 21 ratings Time: 47:22 More in Science & Technology

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  • Configuring trace file size and number in WebCenter Content 11g

    - by Kyle Hatlestad
    Lately I've been doing a lot of debugging using the System Output tracing in WebCenter Content 11g.  This is built-in tracing in the content server which provides a great level of detail on what's happening under the hood.  You can access the settings as well as a view of the tracing by going to Administration -> System Audit Information.  From here, you can select the tracing sections to include.  Some of my personal favorites are searchquery,  systemdatabase, userstorage, and indexer.  Usually I'm trying to find out some information regarding a search, database query, or user information.  Besides debugging, it's also very helpful for performance tuning. One of the nice tricks with the tracing is it honors the wildcard (*) character.  So you can put in 'schema*' and gather all of the schema related tracing.  And you can notice if you select 'all' and update, it changes to just a *.   To view the tracing in real-time, you simply go to the 'View Server Output' page and the latest tracing information will be at the bottom. This works well if you're looking at something pretty discrete and the system isn't getting much activity.  But if you've got a lot of tracing going on, it would be better to go after the trace log file itself.  By default, the log files can be found in the <content server instance directory>/data/trace directory. You'll see it named 'idccs_<managed server name>_current.log.  You may also find previous trace logs that have rolled over.  In this case they will identified by a date/time stamp in the name.  By default, the server will rotate the logs after they reach 1MB in size.  And it will keep the most recent 10 logs before they roll off and get deleted.  If your server is in a cluster, then the trace file should be configured to be local to the node per the recommended configuration settings. If you're doing some extensive tracing and need to capture all of the information, there are a couple of configuration flags you can set to control the logs. #Change log size to 10MB and number of logs to 20FileSizeLimit=10485760FileCountLimit=20 This is set by going to Admin Server -> General Configuration and entering them in the Additional Configuration Variables: section.  Restart the server and it should take on the new logging settings. 

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  • Getting the right results with bcp and DTS with multiple versions of SQL Server installed.

    - by fatherjack
    I was using SSIS for the first time on an instance the other day and came across this error when I executed a package Package migration from version 3 to version 2 failed with error 0xC001700A. The version number in the package is not valid. The version number cannot be greater than current version number. This was a pain and wasn't something that I was expecting, however, the error message made sense - the package was being executed by the wrong version of the executable. Not impossible to...(read more)

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  • Cannot Boot Win XP or Ubuntu from hard drive - get Input Not Supported

    - by Jim Hudspeth
    1) Downloaded 11.10 ISO file to Dell XP Workstation 2) Made bootable USB using Pendrivelinux 3) Installed to harddrive using option 1 (Install along side Windows) 4) Rebooted when instructed 5) Booted into Ubuntu just fine (first time) 6) Attempted restart - got first splash screen followed by "input not supported" - tapped ESC and eventually got into Ubuntu 7) Later attempts failed - got "input not supported"; no eventual boot 8) Many retries holding / tapping various keys - same result 9) Booted from USB - all files appear to be in place - can access GRUB on harddrive Suggestions appreciated - must to be able to boot XP. Thanks in advance

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  • Bachelor degree in Software engineering in distance (online) in Europe

    - by Nikita Sumeiko
    Currently I wish to expand my professional skills with Bachelor degree. However, I am not able to study full time abroad, but looking for University where I could study in distance (online from home), coming just several times in a semester to the University to pass exams, complete papers and so on. I am looking for Software Engineering or Computer Science programs. Fully in distance (online) in English in Europe, because I am living in Central Europe. Any suggestions?

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  • Google I/O 2012 - From Weekend Hack to Funded Startup - How to Build Your Team and Raise Money

    Google I/O 2012 - From Weekend Hack to Funded Startup - How to Build Your Team and Raise Money Naval Ravikant, Rich Miner, Kevin Rose Have an idea and want to start a company? Learn how to attract investors, and what they want to see before writing a check. Hear from entrepreneurs who have raised money and VCs who have funded them. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 0 0 ratings Time: 01:00:30 More in Science & Technology

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  • Google I/O 2012 - Go Concurrency Patterns

    Google I/O 2012 - Go Concurrency Patterns Rob Pike Concurrency is the key to designing high performance network services. Go's concurrency primitives (goroutines and channels) provide a simple and efficient means of expressing concurrent execution. In this talk we see how tricky concurrency problems can be solved gracefully with simple Go code. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 169 2 ratings Time: 51:27 More in Science & Technology

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  • What technologies and tools would I need to create an advanced 3D game on Unreal Engine 3?

    - by BleakCabalist
    This is a purely hypothetical question. Let's say I already have the UE3 license and would like to create an advanced single-player FPS. What other tools/technologies would I need? For example for audio, animations, modeling and so on. I mean all of them. I've been looking for some time now and can't find any source, which would say what's needed from beggining to the end of game development cycle.

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  • Master Data Management Update

    Oracle's Master Data Management suite has seen remarkable development progress in the past year and a half. Leveraging out-of-the-box integration to applications provided by Application Integration Architecture, the cost, risk and time it takes to implement an MDM solution has been cut in half. Oracle Applications are now 'MDM Aware', Data Quality tools have reached state-of-the-art status, and new hubs are coming on line. In this AppsCast, Pascal Laik, VP MDM Products discusses this progress, what it means for Oracle customers, and where we are going from here.

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  • What if you could work on anything you wanted?

    - by Nick Harrison
    What if you could work on anything you wanted? Redgate is doing an experiment of sorts this week.  Called Down Tools Week.    The idea is that they stopped working on their regular projects for a week and strike out on something that catches their attention and drives their passion. Evidently in many cases, these projects have turned out to be new features in their existing products that individual were interested in, some were internal iniatives and some where evidently off the wall new ideas.   Today is show and tell where they will share with each other what they have been working on. There may well be some interesting announcements coming out of this.    The prospects are exciting. I understand that Google does something similar allowing their employees a specified amount of time to work on projects of their own choosing.    This has been the breeding ground for some of my favorite services. It is a shame that more companies do not follow such practices.   Now I know that most companies cannot afford to shut down everything for a week and sometimes you can't really explore an interesting idea in 8 hours a week or however much time Google allocates, but still it may be worth while. What would happen if your company gave you as an individual 1 week each quarter to work on a project of your own design and see what happens?   I would be happen if you still had to get approval for before your week long adventure. Personally, I think that this could be a very effective use of training budgets.   Give me a week to research something on my own and you would be amazed at what I can find out.    Maybe this should be the prerequisite before starting a new project.   Stagger the team onboarding but have everyone spend a week long sabbatical studying BizTalk before starting a project that will hinge on BizTalk. The show and tell afterwards is a great way to keep everyone honest or at least reassure management that everyone is honest.    If your goal was to spend a week researching and exploring a new technology and you had to do a show and tell afterwards to show off what you had learned, then everyone can learn a bit of what you just learned.     Sounds like a promising win win for me. Maybe it is a pipe dream, but what if .... What would you work on if given the opportunity to work on anything you wanted?

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  • Microsoft Plays the Open Source Software Game

    OS Roundup: Microsoft appears to have woken up to the fact that free open-source Office clones may be the thin end of a very slippery wedge. Its response is loud and clear, as it tells the world, when it comes to operating systems Microsoft intends to be a formidable competitor for some time to come.

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  • Microsoft Plays the Open Source Software Game

    OS Roundup: Microsoft appears to have woken up to the fact that free open-source Office clones may be the thin end of a very slippery wedge. Its response is loud and clear, as it tells the world, when it comes to operating systems Microsoft intends to be a formidable competitor for some time to come.

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  • What Counts for a DBA: Passion

    - by drsql
    One of my first questions, when interviewing for a DBA/Programmer position, is always: “Why do you want this job?” The answers I receive range from cheesy hyperbole (“I want to enhance your services with my vast knowledge”) to deadpan realism (“I have N kids who all have a hole in the front of their face where food goes"). Both answers are fine in their own way, at least displaying some self-confidence, humour and honesty, but once in a while, I'll hear the answer that is music to me ears... “I LOVE DATABASES!” Whenever I hear it, my nerves tingle in hopeful anticipation; have I found someone for whom working with database isn't just a job, but a passion? Inevitably, I'm often disappointed. What initially seemed like passion turns out to be rather shallow enthusiasm; the person is enthusiastic about working with databases in the same way he or she might be about eating a bag of Cajun spiced kettle chips; enjoyable, but not something to think about too deeply or take too seriously. Enthusiasm comes, and enthusiasm goes. I've seen countless technical forum users burst onto the scene in a blaze of frantic question-answering, only to fade away within days, never to be heard from again. Passion, however, is more of a longstanding commitment. The biographies of the great technologists and authors of the recent past are full of the sort of passion and engrossment that lead a person to write a novel non-stop for a fortnight with no sleep and only dog food to eat (Philip K. Dick), or refuse to leave the works of the first tunnel under the Thames, even though it was flooded (Brunel). In a similar (though more modest) way, my passion for working with databases has led me to acts that might cause someone for whom it was "just a job" to roll their eyes in disbelief. Most evenings you're more likely to find me reading a database book than watching TV. I've spent hundreds of hours of my spare time writing blogs and articles (some of which are only read by tens of people); I've spent hundreds of dollars travelling to conferences, paying my own flight and hotel expenses, so that I can share a little of what I know, and mix with some like-minded people. And I know I'm far from alone in this, in the SQL Server community. Passion isn't everything, of course, and it isn't always accompanied by any great skill, but in almost every case, that skill can be cultivated over time. If you are doing what you are passionate about, work turns into more than just a way to feed your kids; it becomes your hobby, entertainment, and preoccupation. And it is this passion that gives a DBA the obsessive stubbornness, the refusal to be beaten by even the most difficult problem, which is often so crucial. A final word of warning though: passion without limits can turn weird. Never let it get in the way of your wife, kids, bills, or personal hygiene.

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  • Deactivate volume amplification?

    - by Industrial
    Hi everyone, I would like to deactivate the amplification feature on my sound volume slider. Using any amplification makes the sound really bad with clipping sounds taking over. It's really annoying to have to worry about where the amplification starts/stops when adjusting the slider from my keyboard or through the Gnome panel (sound thingy). I have to open the "Sound preferences" after each time adjusting the volume and ensure that the level is set to 100% unamplified. So can I do this someway easy in Ubuntu 10.10?

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  • App Submission for Showdown

    - by Caustic
    If I submit my app to the ARB today, can I make any changes before Monday?. Or will the ARB consider my app based on the version that was submitted on the submission day? ie If I make changes will I have to resubmit. Obviously if they suggest changes I will have to resubmit. But what if there are no suggestions for change. Will they grab the latest versions of apps at the end of the competition time? Thanks

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  • SQL 2014 does data the way developers want

    - by Rob Farley
    A post I’ve been meaning to write for a while, good that it fits with this month’s T-SQL Tuesday, hosted by Joey D’Antoni (@jdanton) Ever since I got into databases, I’ve been a fan. I studied Pure Maths at university (as well as Computer Science), and am very comfortable with Set Theory, which undergirds relational database concepts. But I’ve also spent a long time as a developer, and appreciate that that databases don’t exactly fit within the stuff I learned in my first year of uni, particularly the “Algorithms and Data Structures” subject, in which we studied concepts like linked lists. Writing in languages like C, we used pointers to quickly move around data, without a database in sight. Of course, if we had a power failure all this data was lost, as it was only persisted in RAM. Perhaps it’s why I’m a fan of database internals, of indexes, latches, execution plans, and so on – the developer in me wants to be reassured that we’re getting to the data as efficiently as possible. Back when SQL Server 2005 was approaching, one of the big stories was around CLR. Many were saying that T-SQL stored procedures would be a thing of the past because we now had CLR, and that obviously going to be much faster than using the abstracted T-SQL. Around the same time, we were seeing technologies like Linq-to-SQL produce poor T-SQL equivalents, and developers had had a gutful. They wanted to move away from T-SQL, having lost trust in it. I was never one of those developers, because I’d looked under the covers and knew that despite being abstracted, T-SQL was still a good way of getting to data. It worked for me, appealing to both my Set Theory side and my Developer side. CLR hasn’t exactly become the default option for stored procedures, although there are plenty of situations where it can be useful for getting faster performance. SQL Server 2014 is different though, through Hekaton – its In-Memory OLTP environment. When you create a table using Hekaton (that is, a memory-optimized one), the table you create is the kind of thing you’d’ve made as a developer. It creates code in C leveraging structs and pointers and arrays, which it compiles into fast code. When you insert data into it, it creates a new instance of a struct in memory, and adds it to an array. When the insert is committed, a small write is made to the transaction to make sure it’s durable, but none of the locking and latching behaviour that typifies transactional systems is needed. Indexes are done using hashes and using bw-trees (which avoid locking through the use of pointers) and by handling each updates as a delete-and-insert. This is data the way that developers do it when they’re coding for performance – the way I was taught at university before I learned about databases. Being done in C, it compiles to very quick code, and although these tables don’t support every feature that regular SQL tables do, this is still an excellent direction that has been taken. @rob_farley

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  • Query optimization using composite indexes

    - by xmarch
    Many times, during the process of creating a new Coherence application, developers do not pay attention to the way cache queries are constructed; they only check that these queries comply with functional specs. Later, performance testing shows that these perform poorly and it is then when developers start working on improvements until the non-functional performance requirements are met. This post describes the optimization process of a real-life scenario, where using a composite attribute index has brought a radical improvement in query execution times.  The execution times went down from 4 seconds to 2 milliseconds! E-commerce solution based on Oracle ATG – Endeca In the context of a new e-commerce solution based on Oracle ATG – Endeca, Oracle Coherence has been used to calculate and store SKU prices. In this architecture, a Coherence cache stores the final SKU prices used for Endeca baseline indexing. Each SKU price is calculated from a base SKU price and a series of calculations based on information from corporate global discounts. Corporate global discounts information is stored in an auxiliary Coherence cache with over 800.000 entries. In particular, to obtain each price the process needs to execute six queries over the global discount cache. After the implementation was finished, we discovered that the most expensive steps in the price calculation discount process were the global discounts cache query. This query has 10 parameters and is executed 6 times for each SKU price calculation. The steps taken to optimise this query are described below; Starting point Initial query was: String filter = "levelId = :iLevelId AND  salesCompanyId = :iSalesCompanyId AND salesChannelId = :iSalesChannelId "+ "AND departmentId = :iDepartmentId AND familyId = :iFamilyId AND brand = :iBrand AND manufacturer = :iManufacturer "+ "AND areaId = :iAreaId AND endDate >=  :iEndDate AND startDate <= :iStartDate"; Map<String, Object> params = new HashMap<String, Object>(10); // Fill all parameters. params.put("iLevelId", xxxx); // Executing filter. Filter globalDiscountsFilter = QueryHelper.createFilter(filter, params); NamedCache globalDiscountsCache = CacheFactory.getCache(CacheConstants.GLOBAL_DISCOUNTS_CACHE_NAME); Set applicableDiscounts = globalDiscountsCache.entrySet(globalDiscountsFilter); With the small dataset used for development the cache queries performed very well. However, when carrying out performance testing with a real-world sample size of 800,000 entries, each query execution was taking more than 4 seconds. First round of optimizations The first optimisation step was the creation of separate Coherence index for each of the 10 attributes used by the filter. This avoided object deserialization while executing the query. Each index was created as follows: globalDiscountsCache.addIndex(new ReflectionExtractor("getXXX" ) , false, null); After adding these indexes the query execution time was reduced to between 450 ms and 1s. However, these execution times were still not good enough.  Second round of optimizations In this optimisation phase a Coherence query explain plan was used to identify how many entires each index reduced the results set by, along with the cost in ms of executing that part of the query. Though the explain plan showed that all the indexes for the query were being used, it also showed that the ordering of the query parameters was "sub-optimal".  Parameters associated to object attributes with high-cardinality should appear at the beginning of the filter, or more specifically, the attributes that filters out the highest of number records should be placed at the beginning. But examining corporate global discount data we realized that depending on the values of the parameters used in the query the “good” order for the attributes was different. In particular, if the attributes brand and family had specific values it was more optimal to have a different query changing the order of the attributes. Ultimately, we ended up with three different optimal variants of the query that were used in its relevant cases: String filter = "brand = :iBrand AND familyId = :iFamilyId AND departmentId = :iDepartmentId AND levelId = :iLevelId "+ "AND manufacturer = :iManufacturer AND endDate >= :iEndDate AND salesCompanyId = :iSalesCompanyId "+ "AND areaId = :iAreaId AND salesChannelId = :iSalesChannelId AND startDate <= :iStartDate"; String filter = "familyId = :iFamilyId AND departmentId = :iDepartmentId AND levelId = :iLevelId AND brand = :iBrand "+ "AND manufacturer = :iManufacturer AND endDate >=  :iEndDate AND salesCompanyId = :iSalesCompanyId "+ "AND areaId = :iAreaId  AND salesChannelId = :iSalesChannelId AND startDate <= :iStartDate"; String filter = "brand = :iBrand AND departmentId = :iDepartmentId AND familyId = :iFamilyId AND levelId = :iLevelId "+ "AND manufacturer = :iManufacturer AND endDate >= :iEndDate AND salesCompanyId = :iSalesCompanyId "+ "AND areaId = :iAreaId AND salesChannelId = :iSalesChannelId AND startDate <= :iStartDate"; Using the appropriate query depending on the value of brand and family parameters the query execution time dropped to between 100 ms and 150 ms. But these these execution times were still not good enough and the solution was cumbersome. Third and last round of optimizations The third and final optimization was to introduce a composite index. However, this did mean that it was not possible to use the Coherence Query Language (CohQL), as composite indexes are not currently supporte in CohQL. As the original query had 8 parameters using EqualsFilter, 1 using GreaterEqualsFilter and 1 using LessEqualsFilter, the composite index was built for the 8 attributes using EqualsFilter. The final query had an EqualsFilter for the multiple extractor, a GreaterEqualsFilter and a LessEqualsFilter for the 2 remaining attributes.  All individual indexes were dropped except the ones being used for LessEqualsFilter and GreaterEqualsFilter. We were now running in an scenario with an 8-attributes composite filter and 2 single attribute filters. The composite index created was as follows: ValueExtractor[] ve = { new ReflectionExtractor("getSalesChannelId" ), new ReflectionExtractor("getLevelId" ),    new ReflectionExtractor("getAreaId" ), new ReflectionExtractor("getDepartmentId" ),    new ReflectionExtractor("getFamilyId" ), new ReflectionExtractor("getManufacturer" ),    new ReflectionExtractor("getBrand" ), new ReflectionExtractor("getSalesCompanyId" )}; MultiExtractor me = new MultiExtractor(ve); NamedCache globalDiscountsCache = CacheFactory.getCache(CacheConstants.GLOBAL_DISCOUNTS_CACHE_NAME); globalDiscountsCache.addIndex(me, false, null); And the final query was: ValueExtractor[] ve = { new ReflectionExtractor("getSalesChannelId" ), new ReflectionExtractor("getLevelId" ),    new ReflectionExtractor("getAreaId" ), new ReflectionExtractor("getDepartmentId" ),    new ReflectionExtractor("getFamilyId" ), new ReflectionExtractor("getManufacturer" ),    new ReflectionExtractor("getBrand" ), new ReflectionExtractor("getSalesCompanyId" )}; MultiExtractor me = new MultiExtractor(ve); // Fill composite parameters.String SalesCompanyId = xxxx;...AndFilter composite = new AndFilter(new EqualsFilter(me,                   Arrays.asList(iSalesChannelId, iLevelId, iAreaId, iDepartmentId, iFamilyId, iManufacturer, iBrand, SalesCompanyId)),                                     new GreaterEqualsFilter(new ReflectionExtractor("getEndDate" ), iEndDate)); AndFilter finalFilter = new AndFilter(composite, new LessEqualsFilter(new ReflectionExtractor("getStartDate" ), iStartDate)); NamedCache globalDiscountsCache = CacheFactory.getCache(CacheConstants.GLOBAL_DISCOUNTS_CACHE_NAME); Set applicableDiscounts = globalDiscountsCache.entrySet(finalFilter);      Using this composite index the query improved dramatically and the execution time dropped to between 2 ms and  4 ms.  These execution times completely met the non-functional performance requirements . It should be noticed than when using the composite index the order of the attributes inside the ValueExtractor was not relevant.

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  • Java Hashed Collections

    The Java collections framework contains classes you use to maintain collections of other objects. These collection classes have different performance and ordering properties. See how the HashMap and HashSet Classes allow objects to be added to a collection, removed from a collection, or found in roughly constant time. Discover how to use these classes and what to do to achieve good performance from them.

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  • Google I/O 2010 - Android REST client applications

    Google I/O 2010 - Android REST client applications Google I/O 2010 - Developing Android REST client applications Android 301 Virgil Dobjanschi This session will present architectural considerations for developing RESTful applications on the Android platform. It focuses on design patterns, platform integration and performance issues specific to the Android platform. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 3 0 ratings Time: 59:42 More in Science & Technology

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  • How to keep your eyes on the prize?

    - by Ziv
    I'm about to go in a very intensive programming course (8AM-8PM every day of the week for three months), at the end of which I will be given a developer job-the job's quality and the project I will work on will depend on my performance in the course. Getting a good position in the company could be very beneficial and I would very much want that, does anyone have specific techniques or ways that he keeps himself concentrated on a goal for a long period of time?

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  • Google I/O 2012 - Data Driven Storytelling

    Google I/O 2012 - Data Driven Storytelling Michael Fink, Yinnon Haviv, Dani Bacon From a single chart to elaborate data driven storytelling, Google Chart Tools now provides a crisp and accessible experience based on our new HTML5 gallery. Come and learn how you can use animations, annotations and other visual semantics and to take user-interaction with rich data, to the next level. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 563 10 ratings Time: 53:05 More in Science & Technology

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  • Google I/O 2012 - SPDY: It's Here!

    Google I/O 2012 - SPDY: It's Here! Roberto Peon SPDY makes your web pages faster over SSL than they'd be over HTTP. We'll talk about why you should care, give tips about how to take advantage of its features, talk about working implementations, and tell you about the future. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 290 22 ratings Time: 43:50 More in Science & Technology

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  • Initial direction of intersection between two moving vehicles?

    - by Larolaro
    I'm working with a bit of projectile prediction for my AI and I'm looking for some ideas, any input? If a blue vehicle is moving in a direction at a constant speed of X m/s and a stationary orange vehicle has a rocket that travels Y m/s, which initial direction would the orange vehicle have to fire the rocket for it to hit the blue vehicle at the earliest time in the future? Thanks for reading!

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  • language problem ubuntu 13.10

    - by Dennis Rasmussen
    I just installed Ubuntu 13.10, and really enjoy it. I am from Denmark, and use the supported Danish keyboard-layout (and chose it as default in the install), but whenever i reboot Ubuntu switches back to English keyboard-layout, though the little icon in the panel says it's in Danish. I have to click on the icon every time to change it back to Danish. I tried removing the English keyboard-layout, but it didn't help. Any suggestions?

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