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• Data base preference for network based C# windows application [on hold]

  - by Sinoop Joy

  I'm planning to develop a C# widows based application for an academy. The academy will have different instances of application running in different machines. The database should have shared access. All the application instances can do update, delete or insert. I've not done any network based application. Anybody can give any useful link to where to start with ? Which database would give max performance with all required features i said for this scenario ?

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• Is it Considered Good SQL practice to use GUID to link multiple tables to same Id field?

  - by Mallow

  I want to link several tables to a many-to-many(m2m) table. One table would be called location and this table would always be on one side of the m2m table. But I will have a list of several tables for example: Cards Photographs Illustrations Vectors Would using GUID's between these tables to link it to a single column in another table be considered 'Good Practice'? Will Mysql let me to have it automatically cascade updates and delete? If so, would multiple cascades lead to an issues? UPDATE I've read that GUID (a hex number) Generally takes up more space in a database and slows queries down. However I could still generate 'unique' ids by just having the table initial's as part of the id so that the table card's id would be c0001, and then Illustrations be I001. Regardless of this change, the questions still stands.

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• Searching for entity awareness in 3D space algorithm and data structure

  - by Khanser

  I'm trying to do some huge AI system just for the fun and I've come to this problem. How can I let the AI entities know about each other without getting the CPU to perform redundant and costly work? Every entity has a spatial awareness zone and it has to know what's inside when it has to decide what to do. First thoughts, for every entity test if the other entities are inside the first's reach. Ok, so it was the first try and yep, that is redundant and costly. We are working with real time AI over 10000+ entities so this is not a solution. Second try, calculate some grid over the awareness zone of every entity and test whether in this zones are entities (we are working with 3D entities with float x,y,z location coordinates) testing every point in the grid with the indexed-by-coordinate entities. Well, I don't like this because is also costly, but not as the first one. Third, create some multi linked lists over the x's and y's indexed positions of the entities so when we search for an interval between x,y and z,w positions (this interval defines the square over the spatial awareness zone) over the multi linked list, we won't have 'voids'. This has the problem of finding the nearest proximity value if there isn't one at the position where we start the search. I'm not convinced with any of the ideas so I'm searching for some enlightening. Do you people have any better ideas?

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• EMC Clusters Data Domain Deduplication Appliances

  EMC has taken its first step toward global deduplication with the dual-controller Global Deduplication Array.

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• Stored Procedure Driven Data Grid

  Dynamically updates datagrid columns and formats without change the code files

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• Places to store basic data

  - by Ella

  I am using PHP. I'm building a fully modular CMS, which is destined for the public. Some people might view this as a framework, but I intend to write a set of extensions for it, extensions that will make it a CMS :P Because it's completely modular I have a problem figuring out how to load extensions. Practically I need to get the list of active extensions, so I can load them inside my base class. I load them by reading some file headers, which contain a "dependency" field. That field decides the order in which I have to instantiate the objects. The problem is that when the CMS starts I have no database interface, because that's an extension too, so I can't store the active extensions list in the database :) You might ask how are extensions activated in the first place. Well - in the administration interface, which is an extension as well (obviously on first install of the CMS there will be some extensions active by default). Could writing that list inside a text file be a solution? The problem is that a lot of hosts are not very nice with scripts when they write files. And since this CMS is public I might have a problem here?

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• Electronically Captured Data and the Competitive Edge It Gives Your Company

  Are you spending too much time physically handling paper documents in your organization? Like most companies, you are flooded daily with the creation of documents, reports, proposals, stats sheets, a... [Author: Michiel Van Kets - Computers and Internet - May 07, 2010]

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• Octrees as data structure

  - by Christian Frantz

  In my cube world, I want to use octrees to represent my chunks of 20x20x20 cubes for frustum and occlusion culling. I understand how octrees work, I just dont know if I'm going about this the right way. My base octree class is taken from here: http://www.xnawiki.com/index.php/Octree What I'm wondering is how to apply occlusion culling using this class. Does it make sense to have one octree for each cube chunk? Or should I make the octree bigger? Since I'm using cubes, each cube should fit into a node without overlap so that won't be an issue

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• Stored Procedure Driven Data Grid

  Dynamically updates datagrid columns and formats without change the code files...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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• Q: MySQL Cluster - Data insertion in NDBCLUSTER table - error out after 5 million rows

  - by Mata

  MysqlCluster version: mysql-5.6.11 ndb-7.3.2 Insertload = 50 M dataset Datanodes = 3 LOAD DATA INFILE '/input_50m/Table_1_sorted.csv' IGNORE INTO TABLE nw_ndb FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' We recently setup a new mySQL cluster and trying to load data from a flat file. But getting error “Got temporary error 4010 'Node failure caused abort of transaction' from NDBCLUSTER" when inserting 5 million rows in a single table in MySQL Cluster. We are using "LOAD DATA INFILE" command to load the data in the table from csv file. Server (musqld, ndb nodes) has good hardware: 126 GB RAM, 32 Gb allocated to mysqld tried below settings with no effect: SET autocommit=0; SET FOREIGN_KEY_CHECKS=0; SET unique_checks=0; SET GLOBAL ndb_batch_size=8*1024*1024; SET GLOBAL ndb_cache_check_time = 1000; SET GLOBAL ndb_index_stat_cache_entries = 10000000; SET SESSION BULK_INSERT_BUFFER_SIZE=256217728; SET GLOBAL KEY_BUFFER_SIZE=256217728; Any clues?

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• Silverlight 4 + RIA Services - Ready for Business: Consuming Data in the Silverlight Client

  To continue our series, lets see where the fun comes in my look at how easy that is to consume from the client.  First just to help you understand what is happening behind the covers, lets look at a code-behind solution.  In View\Home.xaml put a simple DataGrid on the form. <sdk:DataGrid Name="dataGrid1" Height="152" Width="692" /> Then add these lines of code to Home.xaml.cs   1: var context = new DishViewDomainContext(); 2: this.dataGrid1.ItemsSource...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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• audio and video data in RTP

  - by Banana

  Suppose a user wants to transmit both audio and video to another user, whose formats are AMR for audio and H.264 for video. Does the user have to transmit audio and video packets always separately? Meaning that it is not possible to mix audio and video within the same RTP packed, is that correct? If this is true I guess the RTP protocol will need to know the SSRC of both audio and video to be able to check the sync of the two streams.

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• When to use an Array vs When to use a Vector, when dealing with GameObjects?

  - by user32465

  I understand that from other answers, Arrays and Vectors are the best choices. Many on SE claim that Linked Lists and Maps are bad for video game programming. I understand that for the most part, I can use Arrays. However, I don't really understand exactly when to use Vectors over Arrays. Why even use Vectors? Wouldn't it be best if I simply always used an Array, that way I know how much memory my game needs? Specifically my game would only ever load a single "Map" area of tiles, such as Map[100][100], so I could very easily have an array of GameObjectContainer GameObjects[100][100], which would reserve an entire map's worth of possible gameobjects, correct? So why use a Vector instead? Memory is quite large on modern hardware.

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• Traverse tree with results. Maybe type in Java?

  - by Angelo.Hannes

  I need to check a tree's node state. It can either be OK or NOT_OK. But that state is dependent on its children. So for a node to be OK, every of its children needs to be OK. If one or more of its children is NOT_OK the whole node is NOT_OK. To determine the state of a node I need to aggregate some properties of the node. So I thought of two possible implementations. And they are more or less covered in this question: Why is Option/Maybe considered a good idea and checked exceptions are not? Exception I could pass the properties up the recursion path, and throw an exception if something went wrong. Maybe I implement an Maybe type and let it either hold an error or the aggregated properties. Maybe it is more an Either. I tend towards the last option. And I'm thinking of an enum with two objects. Where I can additionally set those aggregated properties. Am I on the right track? I'm not familiar with the new JDK8 functional stuff. But I'm stuck on JDK7 anyway, so please focus on JDK7.

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• backup and file server for 50+ TB of data

  - by a-bomb

  our office wants to build a new server to handle our data, over the last 10 years our data was stored on CDs, DVDs, HDDs but now they want all of it in one place that is attached to the network for everybody in the office to access it. the data is 20TB new data and the rest is old, the important now is to store these 20tb and gradually store the other 30tb over time. so what is the best solution to do ? we thought of getting an hp server and connect it to an external enclosure that either had tape drives or HDDs (we haven;t decided yet) or to get a NAS server and connect it to the hp server. what should we do because this is new for us ...

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• Inserting Data into a Microsoft SQL 2008 Database in ASP.NET 3.5

  In the previous article Creating an ASP.NET Dynamic Web Page using a MS SQL Server 2 8 Database GridView Display you learned how to create a dynamic web page that can let the user edit and delete database records directly using a web browser. It was demonstrated with a home renovation project where team leaders can update and delete project tasks online. However it does not include features that let users add or insert new records directly into the database using a web browser. This feature will be covered in this tutorial.... Cloud Servers in Demand - GoGrid Start Small and Grow with Your Business. $0.10/hour

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• And the fun continues, access to Azure Reporting and Data Sync secured

  - by Enrique Lima

  Got a couple of emails yesterday to enable more fun stuff to try out, test and share. So, how do I go about getting started with Azure Reporting? There is a wealth of information and guidance available . Here is a link to get more information about it http://www.microsoft.com/en-us/SQLAzure/reporting.aspx And more information from a dev standpoint. http://msdn.microsoft.com/en-us/library/gg430129.aspx Again, more to follow …

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• Best way to update UI when dealing with data synchronization

  - by developerdoug

  I'm working on a bug at work. The app is written in Objective-C for iOS based device, for the iPad. I'm the new guy there and I've been given a hard task. Sometimes, the UIButton text property does not show the correct state when syncing. Basically, when the app is syncing, my UI control would say "Syncing" and when its not syncing it'll display "Updated @ [specific date]". Right now there is a property on the app delegate called "SyncInProgress". When querying / syncing, occurring on background thread, it updates a counter. The property will return a bool checking expression 'counter 0'. There are three states I need to deal with. Sync has started. Sync is updating tables. Sync finished. These items need to occur in order. My coworker suggested to take a state based approach instead of just responding to events. I'm not sure about how to go about that. Would it be best to have the UI receive a notification to determine what state its in or to pull every so often if state changed? Here are two posts that I put on stackoverflow, in the last few days, that relate to this. http://stackoverflow.com/questions/11025469/ios-syncing-using-a-state-approach-instead-of-just-reacting-to-events http://stackoverflow.com/questions/11037930/viewcontroller-when-viewwillappear-called-does-not-always-correctly-reflect-stat Any ideas that anyone might have to very much appreciated. Thanks, developerDoug

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• Requirement, architecture data capture tool

  - by Deno

  Are there any tools available for the following use case: I am planning to write a complex application and now I just know about the basic functional requirments. I am refining the functionality with more and more details. I am also writing down how to implement this in software architecture perspective. I am in a situation where there are multiple ways implement a certain functionality and based on the selected approach, other parts of the program will also change. At this moment, I don't want to decide on the approach to use, I just want to list down all the options, present to a wider audience and get it finalized. Are there any standard software tools to do this? I know I can use MS excel or some mind mapper tools, but just thinking of some standard tools (not just for programmers, but for managers and other) availability Thanks, Den

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• Amazon Kindle - Whispersync implementation?

  - by Bala

  For those who are not aware of Kindle's whispersync, here is how it works (from amazon.com): "...Whispersync synchronizes the bookmarks and furthest page read among devices registered to the same account. Whispersync is on by default to ensure a seamless reading experience for a book read across multiple Kindles." Can anyone give some details on how the Whispersync feature is implemented in Kindle and in the Backend of Amazon? I am guessing this implementation involves a very simple hashmap for each user account. Each hashmap maps Books with satellite information about the book. Satellite information contains bookmarks, furthest page read, device on which it was read, etc.. Thanks!

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• Hospital fined $1m for Patient Data Breach

  - by martin.abrahams

  As an illustration of the potential cost of accidental breaches, the US Dept of Health and Human Services recently fined a hospital $1m for losing documents relating to some of its patients. Allegedly, the documents were left on the subway by a hospital employee. For incidents in the UK, several local government bodies have been fined between £60k and £100k. Evidently, the watchdogs are taking an increasingly firm position.

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• EMC Sees SSDs, Ethernet Taking Over Data Storage

  EMC's Global Marketing CTO comments on solid state drives, the cloud and Ethernet and their roles within storage networking.

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• Is a yobibit really a meaningful unit? [closed]

  - by Joe

  Wikipedia helpfully explains: The yobibit is a multiple of the bit, a unit of digital information storage, prefixed by the standards-based multiplier yobi (symbol Yi), a binary prefix meaning 2^80. The unit symbol of the yobibit is Yibit or Yib.1[2] 1 yobibit = 2^80 bits = 1208925819614629174706176 bits = 1024 zebibits[3] The zebi and yobi prefixes were originally not part of the system of binary prefixes, but were added by the International Electrotechnical Commission in August 2005.[4] Now, what in the world actually takes up 1,208,925,819,614,629,174,706,176 bits? The information content of the known universe? I guess this is forward thinking -- maybe astrophyics or nanotech, or even DNA analysis really will require these orders of magnitude. How far off do you think all this is? Are these really meaningful units?

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• Binding data grid at run time

  In this article you will leatn how to use a IDictionary object.

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• Deleting a game object causing an access violation

  - by Balls

  I tried doing this but it cause an access violation. void GameObjectFactory::Update() { for( std::list<GameObject*>::iterator it=gameObjectList.begin() ..... (*it)->Update(); } void Bomb::Update() { if( time == 2.0f ) { gameObjectFactory->Remove( this ); } } void GameObjectFactory::Remove( ... ) { gameObjectList.remove( ... ); } My thoughts would be to mark the object to be dead then let the factory handle it the on next frame for deletion. Is it the best and fastest way? What do you think?

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