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• Essbase Data precision unraveled

  - by THE

  (guest reference added by Nancy) Anyone who has been working with Data import and exoport as well as the Essbase Excel Add In has probably come across a phenomenon that is called data precision: Lots of zeroes are added to any given number that has been calculated by Essbase, and this gets displayed as "10.0000000000001" or "9.99999999999999" instead of a simple "10" . This question is one of the recurring ones that Support get asked over and over again, and we therefore feel the need to give an explanation to it: I would like to point you to the note The Limits of Data Precision in Essbase (Doc ID 1311188.1) which explains in detail why these numbers are showing up and what to do about it.

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• Google BigQuery - Best Practices for Loading your Data and open Office Hours

  Google BigQuery - Best Practices for Loading your Data and open Office Hours Michael Manoochehri and Ryan Boyd from the DevRel team for cloud data services will be streaming to you live! They'll be discussing how to load your data into BigQuery and the various options available -- from commercial ETL tools to App Engine's Pipeline API and MapReduce frameworks, to simple UNIX command-line tools. They'll then open it up for a general office hours on ingestion and other topics. Please use the moderator link to ask your questions. From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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• ODAC 11.2 Release 3(11.2.0.2.1)?????:64bit?ODP.NET?TimesTen????

  - by Yusuke.Yamamoto

  ODAC 11.2 Release 3(11.2.0.2.1) ??????????? Oracle Data Provider for .NET(ODP.NET) ?? Oracle Providers for ASP.NET ?64bit??????????????? ????????·????????? Oracle TimesTen In-Memory Database ??????????????? Oracle Data Access Components(ODAC) ?????? Oracle Data Access Components(ODAC) ?????? ??? .NET ????????? .NET ?????????????????? Oracle Database ????????? ???????/???1????!.NET + Oracle Database 11g ???????????? ?????????? .NET|???????????

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• Web-based data generator

  - by John Paul Cook

  One of my coworkers told me about Mockaroo , a web-based data generator. I needed some test data for upcoming blog posts, so I decided to give it a try. It’s pretty good. I had to use Firefox because of problems running Mockaroo on Internet Explorer 11. Using the defaults except for changing the format to SQL, it generated output that looked something like the following. Mockaroo is so good that it generates fake data that could accidentally be real, such as email addresses. Consequently, I edited...(read more)

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• Google I/O 2012 - Crunching Big Data with BigQuery

  Google I/O 2012 - Crunching Big Data with BigQuery Jordan Tigani, Ryan Boyd Google BigQuery is a data analysis tool born from Google internal technologies. It enables developers to analyze terabyte data sets in seconds using a RESTful API. This session will dive into best practices for getting fast answers to business questions. We'll provide insight into how we process queries under the hood and how to construct SQL queries for complex analysis. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 1 0 ratings Time: 01:03:04 More in Science & Technology

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• Best way of accessing data on different pages

  - by Gaz83

  I'm looking for a way to load data into properties/variables etc and have this information accessible to all the pages of my app. I want the information to be loaded via a background thread to keep UI thread free. Some of the pages will have various properties of their controls binding to these global properties. Here is what I tried. Created a static class. All pages could access the data but can't bind. Changed the static class to a Singleton and used DependencyProperty's. All pages could access data and binding worked fine but cross-threading issues when accessing via background threads. I have read in various places on this subject but haven't really come up with the best method yet for my situation.

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• BigQuery: Simple example of a data collection and analysis pipeline + Your questions

  BigQuery: Simple example of a data collection and analysis pipeline + Your questions Join Michael Manoochehri and Ryan Boyd live to talk about Google BigQuery. We'll give an overview of how we're using our cars, phones, App Engine and BigQuery to collect and analyze data. We'll be discussing our trusted tester feature which allows analyzing data from the App Engine datastore. We'll also review some of the more interesting questions from Stack Overflow and take questions via Google Moderator. From: GoogleDevelopers Views: 250 16 ratings Time: 26:53 More in Science & Technology

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• Master Data Management - The Trend Towards Multi-Domain and Other Realities

  - by Mala Narasimharajan

  In my quest to keep my fingers on the pulse of MDM, I recently found a pretty interesting article.  The article was published in Information Week and provides some interesting statistics from a recent survey conducted by the analyst firm, The Information Difference.  Let's take a look: Of the 130 organizations surveyed, 53% have live operational MDM implementations 81% of those with live operational MDM implementations report broad success - a huge improvement over 2011's 54% 64% developed a business case prior to their MDM deployment, while a daring 32% went ahead without a business case.    The article goes on to talk about the shift in vendors from focusing on customer data and product information management to one that is oriented around multi-domain master data management as well as other realities around MDM.  Take a look at the article. For more information on Oracle's master data management suite, click here. 

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• Failure to download extra data files

  - by armanke13

  After fresh install 12.04 I && updating apt and system restart, I always get this annoying message after reboot : Failure to download extra data files The following packages requested additional data downloads after package installation, but the data could not be downloaded or could not be processed. ttf-mscorefonts-installer The download will be attempted again later, or you can try the download again now. Running this command requires an active Internet connection. But if I run attempt now, it shows flashing terminal window and like nothing happen. It'll happen again when I restart system. I found someone have this problem too, but he haven't replied yet. I'm a newbie here, please help, thanks ^^

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• Silverlight 4 + RIA Services - Ready for Business: Exposing Data from Entity Framework

  To continue our series I wanted to look next at how to expose your data from the server side of your application.  The interesting data in your business applications come from a wide variety of data sources.  From a SQL Database, from Oracle DB, from Sql Azure, from Sharepoint, from a mainframe and you have likely already chosen a datamodel such as NHibernate, Linq2Sql, Entity Framework, Stored Proc, a service.   The goal of RIA Service in this release is to make it easy to...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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• New eBook: In-Memory Data Grids for Dummies

  - by jeckels

  We've just released a new eBook In-Memory Data Grids for Dummies. This is a fantastic resource if you're looking to explain in-memory data grids to colleagues, convince your boss of their value, or even discover some new use cases for your existing investment. In true "Dummies" style, this eBook will walk you through the basics tenets of in-memory data grids, their common use cases, where IMDGs sit in your architecture, and some key considerations when looking to implement them. While the title may say "Dummies," we know you'll find some useful overview and technical information in the resource. It's published by us on the Coherence team in partnership with Wiley (the "Dummies" company), but it's not only about Coherence or Oracle. In fact, we took pains to make this book fairly neutral to give you the best information, not a product pitch. Happy reading! Download the eBook now 

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• Importing Data From Excel Using SSIS - Part 1

  Recently while working on a project to import data from an Excel worksheet using SSIS, I realized that sometimes the SSIS Package failed even though when there were no changes in the structure/schema of the Excel worksheet. I investigated it and I noticed that the SSIS Package succeeded for some set of files, but for others it failed. I found that the structure/schema of the worksheet from both these sets of Excel files were the same, the data was the only difference. How come just changing the data can make an SSIS Package fail? What actually causes this failure? What can we do to fix it?

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• I need to get past my permissions to recover data

  - by adsmz

  Due to some mishaps, I am unable to boot into Kubuntu at all. However, my data is still on the hard drive. I managed to get one of the other two computers to which I have access to read the disk by booting into a liveCD session of kubuntu. The only storage medium to which I have access is a 30 GB data stick. Here's where the trouble starts: In music alone, I have to back up about 60 GB. Obviously this is going to have to be split into chunks and moved over to the second spare PC until I can reinstall Kubuntu on my laptop. All of the data that needs backed up is behind a permissions wall, so while I can view it, I can't interact with it directly. I know copying and moving through the terminal can get around this with sudo cp or sudo mv, but is there a way to first compress multiple folders in a single archive, then move it? (While we're on the subject, what compression method would be best for large volumes of music in MP3, WAV, and OGG format?)

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• AJAX Return Problem from data sent via jQuery.ajax

  - by Anthony Garand

  I am trying to receive a json object back from php after sending data to the php file from the js file. All I get is undefined. Here are the contents of the php and js file. data.php <?php $action = $_GET['user']; $data = array( "first_name" = "Anthony", "last_name" = "Garand", "email" = "[email protected]", "password" = "changeme"); switch ($action) { case '[email protected]': echo $_GET['callback'] . '('. json_encode($data) . ');'; break; } ? core.js $(document).ready(function(){ $.ajax({ url: "data.php", data: {"user":"[email protected]"}, context: document.body, data: "jsonp", success: function(data){renderData(data);} }); }); function renderData(data) { document.write(data.first_name); }

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• Entity Framework 4 POCO entities in separate assembly, Dynamic Data Website?

  - by steve.macdonald

  Basically I want to use a dynamic data website to maintain data in an EF4 model where the entities are in their own assembly. Model and context are in another assembly. I tried this http://stackoverflow.com/questions/2282916/entity-framework-4-self-tracking-entities-asp-net-dynamic-data-error but get an "ambiguous match" error from reflection: System.Reflection.AmbiguousMatchException was unhandled by user code Message=Ambiguous match found. Source=mscorlib StackTrace: at System.RuntimeType.GetPropertyImpl(String name, BindingFlags bindingAttr, Binder binder, Type returnType, Type[] types, ParameterModifier[] modifiers) at System.Type.GetProperty(String name) at System.Web.DynamicData.ModelProviders.EFTableProvider..ctor(EFDataModelProvider dataModel, EntitySet entitySet, EntityType entityType, Type entityClrType, Type parentEntityClrType, Type rootEntityClrType, String name) at System.Web.DynamicData.ModelProviders.EFDataModelProvider.CreateTableProvider(EntitySet entitySet, EntityType entityType) at System.Web.DynamicData.ModelProviders.EFDataModelProvider..ctor(Object contextInstance, Func1 contextFactory) at System.Web.DynamicData.ModelProviders.SchemaCreator.CreateDataModel(Object contextInstance, Func1 contextFactory) at System.Web.DynamicData.MetaModel.RegisterContext(Func`1 contextFactory, ContextConfiguration configuration) at WebApplication1.Global.RegisterRoutes(RouteCollection routes) in C:\dev\Puffin\Puffin.Prototype.Web\Global.asax.cs:line 42 at WebApplication1.Global.Application_Start(Object sender, EventArgs e) in C:\dev\Puffin\Puffin.Prototype.Web\Global.asax.cs:line 78 InnerException:

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• Properties in partial class not appearing in Data Sources window!

  - by Tim Murphy

  Entity Framework has created the required partial classes. I can add these partial classes to the Data Sources window and the properties display as expected. However, if I extend any of the classes in a separate source file these properties do not appear in the Data Sources window even after a build and refresh. All properties in partial classes across source files work as expected in the Data Sources window except when the partial class has been created with EF. EDIT: After removing the offending table for edm designer, adding back in it all works are expected. Hardly a long term solution. Anyone else come across a similar problem?

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• Data validation: fail fast, fail early vs. complete validation

  - by Vivin Paliath

  Regarding data validation, I've heard that the options are to "fail fast, fail early" or "complete validation". The first approach fails on the very first validation error, whereas the second one builds up a list of failures and presents it. I'm wondering about this in the context of both server-side and client-side data validation. Which method is appropriate in what context, and why? My personal preference for data-validation on the client-side is the second method which informs the user of all failing constraints. I'm not informed enough to have an opinion about the server-side, although I would imagine it depends on the business logic involved.

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• Is it Possible to Query Multiple Databases with WCF Data Services?

  - by Mas

  I have data being inserted into multiple databases with the same schema. The multiple databases exist for performance reasons. I need to create a WCF service that a client can use to query the databases. However from the client's point of view, there is only 1 database. By this I mean when a client performs a query, it should query all databases and return the combined results. I also need to provide the flexibility for the client to define its own queries. Therefore I am looking into WCF Data Services, which provides the very nice functionality for client specified queries. So far, it seems that a DataService can only make a query to a single database. I found no override that would allow me to dispatch queries to multiple databases. Does anyone know if it is possible for a WCF Data Service to query against multiple databases with the same schema?

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• How to unit test internals (organization) of a data structure?

  - by Herms

  I've started working on a little ruby project that will have sample implementations of a number of different data structures and algorithms. Right now it's just for me to refresh on stuff I haven't done for a while, but I'm hoping to have it set up kind of like Ruby Koans, with a bunch of unit tests written for the data structures but the implementations empty (with full implementations in another branch). It could then be used as a nice learning tool or code kata. However, I'm having trouble coming up with a good way to write the tests. I can't just test the public behavior as that won't necessarily tell me about the implementation, and that's kind of important here. For example, the public interfaces of a normal BST and a Red-Black tree would be the same, but the RB Tree has very specific data organization requirements. How would I test that?

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• R: How can I reorder the rows of a matrix, data.frame or vector according to another one.

  - by John

  test1 <- as.matrix(c(1, 2, 3, 4, 5)) row.names(test1) <- c("a", "b", "c", "d", "e") test2 <- as.matrix(c(6, 7, 8, 9, 10)) row.names(test2) <- c("e", "d", "c", "b", "a") test1 [,1] a 1 d 2 c 3 b 4 e 5 test2 [,1] e 6 d 7 c 8 b 9 a 10 How can I reorder test2 so that the rows are in the same order as test1? e.g: test2 [,1] a 10 d 7 c 8 b 9 e 6 I tried to use the reorder function with: reorder (test1, test2) but I could not figure out the correct syntax. I see that reorder takes a vector, and I'm here using a matrix. My real data has one character vector and another as a data.frame. I figured that the data structure would not matter too much for this example above, I just need help with the syntax and can adapt it to my real problem.

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• Limiting TCP sends with a "to-be-sent" queue and other design issues.

  - by Poni

  Hello all! This question is the result of two other questions I've asked in the last few days. I'm creating a new question because I think it's related to the "next step" in my understanding of how to control the flow of my send/receive, something I didn't get a full answer to yet. The other related questions are: http://stackoverflow.com/questions/3028376/an-iocp-documentation-interpretation-question-buffer-ownership-ambiguity http://stackoverflow.com/questions/3028998/non-blocking-tcp-buffer-issues In summary, I'm using Windows I/O Completion Ports. I have several threads that process notifications from the completion port. I believe the question is platform-independent and would have the same answer as if to do the same thing on a *nix, *BSD, Solaris system. So, I need to have my own flow control system. Fine. So I send send and send, a lot. How do I know when to start queueing the sends, as the receiver side is limited to X amount? Let's take an example (closest thing to my question): FTP protocol. I have two servers; One is on a 100Mb link and the other is on a 10Mb link. I order the 100Mb one to send to the other one (the 10Mb linked one) a 1GB file. It finishes with an average transfer rate of 1.25MB/s. How did the sender (the 100Mb linked one) knew when to hold the sending, so the slower one wouldn't be flooded? Another way to ask this: Can I get a "hold-your-sendings" notification from the remote side? Is it built-in in TCP or the so called "reliable network protocol" needs me to do so? Again, I have a loop with many sends to a remote server, and at some point, within that loop I'll have to determine if I should queue that send or I can pass it on to the transport layer (TCP). How do I do that? What would you do? Of course that when I get a completion notification from IOCP that the send was done I'll issue other pending sends, that's clear. Another design question related to this: Since I am to use a custom buffers with a send queue, and these buffers are being freed to be reused (thus not using the "delete" keyword) when a "send-done" notification has been arrived, I'll have to use a mutual exlusion on that buffer pool. Using a mutex slows things down, so I've been thinking; Why not have each thread have its own buffers pool, thus accessing it , at least when getting the required buffers for a send operation, will require no mutex, because it belongs to that thread only. The buffers pool is located at the thread local storage (TLS) level. No mutual pool implies no lock needed, implies faster operations BUT also implies more memory used by the app, because even if one thread already allocated 1000 buffers, the other one that is sending right now and need 1000 buffers to send something will need to allocated these to its own. This is a long question and I hope none got hurt (: Thank you all!

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• How to save objects using Multi-Threading in Core Data?

  - by Konstantin

  I'm getting some data from the web service and saving it in the core data. This workflow looks like this: get xml feed go over every item in that feed, create a new ManagedObject for every feed item download some big binary data for every item and save it into ManagedObject call [managedObjectContext save:] Now, the problem is of course the performance - everything runs on the main thread. I'd like to re-factor as much as possible to another thread, but I'm not sure where I should start. Is it OK to put everything (1-4) to the separate thread?

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• multiple move operations and data processes in work thread

  - by younevertell

  main thread-- start workthread--StartStage(get list of positions for data process) -- move to one position -- data sampling*strong text*-- data collection--data analysis------data sampling*strong text* basically, work thread does the data sampling*strong text*-- data collection--data analysis------data sampling*strong text* loop for one positioin until press stop or target is obtained. my questions: After work thread finishs the loop for one positioin, it would end itself. now how to make the work thread moves to the next position to do the data process loop after work thread finish one position work, would not end itself until data process for all the positions are done? Thanks in advance!

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• R: What are the best functions to deal with concatenating and averaging values in a data.frame?

  - by John

  I have a data.frame from this code: my_df = data.frame("read_time" = c("2010-02-15", "2010-02-15", "2010-02-16", "2010-02-16", "2010-02-16", "2010-02-17"), "OD" = c(0.1, 0.2, 0.1, 0.2, 0.4, 0.5) ) which produces this: > my_df read_time OD 1 2010-02-15 0.1 2 2010-02-15 0.2 3 2010-02-16 0.1 4 2010-02-16 0.2 5 2010-02-16 0.4 6 2010-02-17 0.5 I want to average the OD column over each distinct read_time (notice some are replicated others are not) and I also would like to calculate the standard deviation, producing a table like this: > my_df read_time OD stdev 1 2010-02-15 0.15 0.05 5 2010-02-16 0.3 0.1 6 2010-02-17 0.5 0 Which are the best functions to deal with concatenating such values in a data.frame?

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• What's the reason why core data takes care of the life-cycle of modeled properties?

  - by mystify

  The docs say that I should not release any modeled property in -dealloc. For me, that feels like violating the big memory management rules. I see a big retain in the header and no -release, because Core Data seems to do it at any other time. Is it because Core Data may drop the value of a property dynamically, at any time when needed? And what's Core Data doing when dropping an managed object? If there's no -dealloc, then how and when are the properties getting freed up?

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