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• Why is group write permission ignored in Ubuntu?

  - by NorthPole

  I want my user to have full access to the local Apache root folder, and I also want the Apache user to have full access to the same folder. What I did was create a new group called DevGroup and I added my user and www-data there. Also I changed the permissions to 770 to allow full group access. But now it won't allow me or the Apache user any kind of access to the folder. Here is what I get with ls: drwxrwx--- 12 root DevGroup 4096 Sep 27 17:34 testFolder Which seems perfect but when I try as a user to access the file I get this: var/www$ ls testFolder/ ls: cannot open directory testFolder/: Permission denied Also when I try to access a page in the folder from a browser: [Thu Sep 27 17:47:16 2012] [error] [client 127.0.0.1] PHP Fatal error: Unknown: Failed opening required '/var/www/testFolder/foo.php' (include_path='.:/usr/share/php:/usr/share/pear') in Unknown on line 0 What's the problem and how can I fix it?

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• Lambda&rsquo;s for .NET made easy&hellip;

  - by mbcrump

  The purpose of my blog is to explain things for a beginner to intermediate c# programmer. I’ve seen several blog post that use lambda expressions always assuming the audience is familiar with them. The purpose of this post is to make them simple and easily understood. Let’s begin with a definition. A lambda expression is an anonymous function that can contain expressions and statements, and can be used to create delegates or expression tree types. So anonymous function… delegates or expression tree types? I don’t get it??? Confused yet?   Lets break this into a few definitions and jump right into the code. anonymous function – is an "inline" statement or expression that can be used wherever a delegate type is expected. delegate - is a type that references a method. Once a delegate is assigned a method, it behaves exactly like that method. The delegate method can be used like any other method, with parameters and a return value. Expression trees - represent code in a tree-like data structure, where each node is an expression, for example, a method call or a binary operation such as x < y.   Don’t worry if this still sounds confusing, lets jump right into the code with a simple 3 line program. We are going to use a Function Delegate (all you need to remember is that this delegate returns a value.) Lambda expressions are used most commonly with the Func and Action delegates, so you will see an example of both of these. Lambda Expression 3 lines. using System; using System.Collections.Generic; using System.Linq; using System.Text;   namespace ConsoleApplication7 {     class Program     {          static void Main(string[] args)         {             Func<int, int> myfunc = x => x *x;             Console.WriteLine(myfunc(6).ToString());             Console.ReadLine();         }       } } Is equivalent to Old way of doing it. using System; using System.Collections.Generic; using System.Linq; using System.Text;   namespace ConsoleApplication7 {     class Program     {          static void Main(string[] args)         {               Console.WriteLine(myFunc(6).ToString());             Console.ReadLine();         }            static int myFunc(int x)          {              return x * x;            }       } } In the example, there is a single parameter, x, and the expression is x*x. I’m going to stop here to make sure you are still with me. A lambda expression is an unnamed method written in place of a delegate instance. In other words, the compiler converts the lambda expression to either a : A delegate instance An expression tree All lambda have the following form: (parameters) => expression or statement block Now look back to the ones we have created. It should start to sink in. Don’t get stuck on the => form, use it as an identifier of a lambda. A Lamba expression can also be written in the following form: Lambda Expression. using System; using System.Collections.Generic; using System.Linq; using System.Text;   namespace ConsoleApplication7 {     class Program     {          static void Main(string[] args)         {             Func<int, int> myFunc = x =>             {                 return x * x;             };               Console.WriteLine(myFunc(6).ToString());             Console.ReadLine();         }       } } This form may be easier to read but consumes more space. Lets try an Action delegate – this delegate does not return a value. Action Delegate example. using System; using System.Collections.Generic; using System.Linq; using System.Text;   namespace ConsoleApplication7 {     class Program     {          static void Main(string[] args)         {             Action<string> myAction = (string x) => { Console.WriteLine(x); };             myAction("michael has made this so easy");                                   Console.ReadLine();         }       } } Lambdas can also capture outer variables (such as the example below) A lambda expression can reference the local variables and parameters of the method in which it’s defined. Outer variables referenced by a lambda expression are called captured variables. Capturing Outer Variables using System; using System.Collections.Generic; using System.Linq; using System.Text;   namespace ConsoleApplication7 {     class Program     {          static void Main(string[] args)         {             string mike = "Michael";             Action<string> myAction = (string x) => {                 Console.WriteLine("{0}{1}", mike, x);          };             myAction(" has made this so easy");                                   Console.ReadLine();         }       } } Lamba’s can also with a strongly typed list to loop through a collection.   Used w a strongly typed list. using System; using System.Collections.Generic; using System.Linq; using System.Text;   namespace ConsoleApplication7 {     class Program     {          static void Main(string[] args)         {             List<string> list = new List<string>() { "1", "2", "3", "4" };             list.ForEach(s => Console.WriteLine(s));             Console.ReadLine();         }       } } Outputs: 1 2 3 4 I think this will get you started with Lambda’s, as always consult the MSDN documentation for more information. Still confused? Hopefully you are not.

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• Browser-based Operating System

  - by Ross Peoples

  I have a bunch of touchscreen machines that I want to display a webpage on and have users interact with the webpage via the touchscreen. Right now, this is done with a full-blown OS with a browser set to run at startup. I think maybe the ideal solution is to use a Linux-based OS that boots up, starts X, then starts a web browser (Chrome, Firefox, or whatever) in full screen mode. What kind of options do I have? I really want to avoid using a full-blown OS like I do now. It looks unprofessional and takes a while to boot up. I was thinking maybe Chrome OS or something, but I wouldn't know how to set it up for my purposes, since it's still designed to be used as a desktop OS instead of a kiosk-type OS.

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• Fetching Partition Information

  - by Mike Femenella

  For a recent SSIS package at work I needed to determine the distinct values in a partition, the number of rows in each partition and the file group name on which each partition resided in order to come up with a grouping mechanism. Of course sys.partitions comes to mind for some of that but there are a few other tables you need to link to in order to grab the information required. The table I’m working on contains 8.8 billion rows. Finding the distinct partition keys from this table was not a fast operation. My original solution was to create  a temporary table, grab the distinct values for the partitioned column, then update via sys.partitions for the rows and the $partition function for the partitionid and finally look back to the sys.filegroups table for the filegroup names. It wasn’t pretty, it could take up to 15 minutes to return the results. The primary issue is pulling distinct values from the table. Queries for distinct against 8.8 billion rows don’t go quickly. A few beers into a conversation with a friend and we ended up talking about work which led to a conversation about the task described above. The solution was already built in SQL Server, just needed to pull it together. The first table I needed was sys.partition_range_values. This contains one row for each range boundary value for a partition function. In my case I have a partition function which uses dayid values. For example July 4th would be represented as an int, 20130704. This table lists out all of the dayid values which were defined in the function. This eliminated the need to query my source table for distinct dayid values, everything I needed was already built in here for me. The only caveat was that in my SSIS package I needed to create a bucket for any dayid values that were out of bounds for my function. For example if my function handled 20130501 through 20130704 and I had day values of 20130401 or 20130705 in my table, these would not be listed in sys.partition_range_values. I just created an “everything else” bucket in my ssis package just in case I had any dayid values unaccounted for. To get the number of rows for a partition is very easy. The sys.partitions table contains values for each partition. Easy enough to achieve by querying for the object_id and index value of 1 (the clustered index) The final piece of information was the filegroup name. There are 2 options available to get the filegroup name, sys.data_spaces or sys.filegroups. For my query I chose sys.filegroups but really it’s a matter of preference and data needs. In order to bridge between sys.partitions table and either sys.data_spaces or sys.filegroups you need to get the container_id. This can be done by joining sys.allocation_units.container_id to the sys.partitions.hobt_id. sys.allocation_units contains the field data_space_id which then lets you join in either sys.data_spaces or sys.file_groups. The end result is the query below, which typically executes for me in under 1 second. I’ve included the join to sys.filegroups and to sys.dataspaces, and I’ve  just commented out the join sys.filegroups. As I mentioned above, this shaves a good 10-15 minutes off of my original ssis package and is a really easy tweak to get a boost in my ETL time. Enjoy.

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• Visual WebGui launches a new prize-winning challenge for developers

  - by Webgui

  Gizmox is announcing a ListView Challenge where developers can participate by creating and submitting their own implementations of the new extended ListView. "its quite amazing what you can do with it. It opens a lot of new ways to present data in a better and more userfriendly way," says one of the VWG community members who built a three level hierarchal ListView. Watch the hierarchal ListView demo by Visualizer Those ListView implementations will be reviewed and rated and the winner will win a free Professional Studio license $750 worth. The 5 top rated codes will entitle their developers for a cool new T-shirt. The new v6.4 introduces new capabilities with its extended ListView Control. Enter the Challenge The Collapsible Panel enhancement of the ListView Control, along with the Column Type Control, open up the possibilities for potential usage of the ListView control for data display, data entry and as the Collapsible Panel can contain whatever control you like, it can as well contain other ListView controls, thus making it possible to create Hierarchial ListView display of unlimited number of levels. The first enhancement is the introduction of a new column type Control which opens up the possibility for a ListView cell to contain controls like CheckBox, ComboBox, ListBox or even TabControl, Form or another ListView as the contents of that particular cell. This means that the ListView is no longer a display-only control, but has the full potential of being a full blown data entry control as well. The second major enhancement is the introduction of ListViewPanelItem. The ListViewPanelItem behaves exactly the same as it‘s predecessor, the ListViewItem, and in additon it has a Panel Control attached to it, seperate panel for each row in the ListView. This new Panel can be either expanded (visible) or not (hidden) and when expanded, will fill the full width of the ListView, but has adjustable height. Watch a webcast about the extended ListView

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• Cropping images & SEO

  - by user1181950

  So I have a page with a bunch of images with largely varying sizes. Also the layout of the page is such that the images are all in the shape of square tiles, so just resizing will cause distorted images. What I've been doing previously is when users upload images, I resize and crop them appropriately and display the new image as the thumbnail and load full image when user clicks on it. However, I just realized this is an issue with SEO as google will crawl the thumbnails and stick the thumbnails on Google Images instead of the full images. Is there any way to show a cropped/resized image but have Google Image show the full image? I can do something with css using an enclosing div and overflow:hidden, but I'd imagine the performance on that would be pretty bad. Any suggestions? Thanks! PS. I saw this (Make google index the actual image not the thumbnail), but in my case I have users continuously uploading images, and the database of images is always changing and pretty big (thousands), so sitemap will be pretty unwieldy..

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• Microsoft releases Visual Studio 2010 SP1

  - by brian_ritchie

  Microsoft has been beta testing SP1 since December of last year.  Today, it was released to MSDN subscribers and will be available for public download on March 10, 2011.The service pack includes a slew of fixes, and a number of new features: Silverlight 4 supportBasic Unit Testing support for the .NET Framework 3.5Performance Wizard for SilverlightIntelliTrace for 64-bit and SharePointIIS Express supportSQL CE 4 supportRazor supportHTML5 and CSS3 support (IntelliSense and validation)WCF RIA Services V1 SP1 includedVisual Basic Runtime embeddingALM Improvements Of all the improvements, IIS Express probably has the largest impact on web developer productivity.  According to Scott Gu, it provides the following:It’s lightweight and easy to install (less than 10Mb download and a super quick install)It does not require an administrator account to run/debug applications from Visual Studio It enables a full web-server feature set – including SSL, URL Rewrite, Media Support, and all other IIS 7.x modules It supports and enables the same extensibility model and web.config file settings that IIS 7.x support It can be installed side-by-side with the full IIS web server as well as the ASP.NET Development Server (they do not conflict at all) It works on Windows XP and higher operating systems – giving you a full IIS 7.x developer feature-set on all OS platforms IIS Express (like the ASP.NET Development Server) can be quickly launched to run a site from a directory on disk.  It does not require any registration/configuration steps. This makes it really easy to launch and run for development scenarios.Good stuff indeed.  This will make our lives much easier.  Thanks Microsoft...we're feeling the love!  

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• Meet Matthijs, Dutch Inside Sales Representative for Oracle Direct

  - by Maria Sandu

  Today we would like to share some information around the Dutch Core Technology team in Malaga. Matthijs is one of the team members who decided to relocate from the Netherlands to Malaga to join Oracle Direct two years ago. Matthijs: “For the past two years I have been working as an Oracle Direct Core Technology Inside Sales representative for Named Accounts in the Netherlands, based in Malaga, Spain. In my case, working for the Dutch OD Core Technology team means that I am responsible for the Account Management of Larger companies in the Travel & Transportation and the Manufacturing, Retail & Distribution sector. I work together with the Oracle Field Account Managers and our Field Sales Management in the Netherlands where I am often the main point of contact for customers. This means that I deal with their requests and I manage their various issues, provide solutions and suggestions based on the Oracle Core Technology portfolio. I work on interesting projects with end-customers, making financial proposals and building business cases. It is a very interesting sales environment and for the last two years I improved my skills substantially. This month I will finish my Inside Sales career in Malaga to move to a position within Field Sales in the Netherlands. Oracle Direct has proven to be a great stepping stone for my career. Boost your personal development One of the reasons for joining Oracle was to boost my personal & career development. You can choose from various different trainings to follow all over Europe which enable you to reach both your personal and professional goals. Furthermore, you can decide your own career path and plan the steps necessary to achieve your goal. Many people aim to grow into Field Sales in their native countries, Business Development or Sales Management, but there are many possibilities once you decide to join Oracle. Overall, working at Oracle means working for an international company and one of the worldwide leaders in Enterprise Hardware & Software. Here you get all the tools necessary to develop yourself personally & professionally. Another great advantage of working for Oracle Direct is working from our office in Malaga, Southern Spain where we have over 400 employees from many countries across EMEA. It is a truly international environment! Working and living in Spain gives you an excellent opportunity to learn Spanish and of course enjoy the Spanish lifestyle, cuisine, beaches and much, much more!” Interview day Utrecht If you are inspired by the story of Matthijs and would like to explore the opportunity to join the Technology Sales team for the Dutch market in Malaga, let us know! We will organise an Interview day in the Oracle office in Utrecht on the 18th and 19th of September. We currently have multiple openings in the Core Technology team that focus on selling our Database portfolio in the Dutch market. We are looking for native Dutch speakers with a Bachelors degree, 2-5 years sales experience (ideally in IT) who are willing to relocate to Malaga for at least 2 years! For more information please contact [email protected] or [email protected].

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• Software for capturing still image snapshots from video input

  - by cantabilesoftware

  What software is available that will let me watch video from a USB video capture device at full PAL/NTSC resolution and capture a still image at a button press? More info: I'm using a KaiserBaas USB capture device (http://www.kaiserbaas.com/kaiser-baas-product-page/converters/video-to-dvd-maker), and want to capture screen shots from a PS2 connected to it. I'd like to play the game at the full PS2 resolution and capture certain scenes. The device has a one-touch snapshot button on it, but I can't seem to make it work and there's no mention of it anywhere in the documentation. The device works and the video appears in Power Producer (the included software), but I think it previews it smaller than the full resolution. I could print screen it, but having to crop will be a pain.

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• Less reboots on Windows Server Core, is this true or just a myth?

  - by Peter Hahndorf

  Because there are less components installed on a Windows Server core OS, it needs less patches than the full OS. I read in several places that therefor it needs less reboots after patching. I'm running Server 2012 core in production since September 2012 now and I don't remember a single patch-Tuesday when I did not have to reboot the server after installing Windows updates. Are there any hard numbers out there that compare the required reboots for core vs. Full OS? Less reboots may be the main reason why people choose to go with Server core. If it actually requires just as many reboots as the full OS install, they may think again the next time they set up a server.

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• What's the best way to move cars along roads

  - by David Thielen

  I am implementing car movement game (sort-of like Locomotion). So 60 times a second I have to advance the movement of each car. The problem is I have to look ahead to see if there is a slower car, stop sign, or red light ahead. And then slow down appropiately. I also want to have the cars take time to go from stopped to full speed and again to slow down. I'm not implementing full-blown physics, but just a tick by tick speed up/slow down as that provides most of the realism to match what people expect to see. The best I've come up with is to walk out the full distance the car would travel of it was slowing to a stop and see if anywhere along that path it needed to slow down or stop. And then move it forward appropiately. I am moving the cars 60 times a second so I need this to be fast. And walking out that whole path each tick strikes me as processor intensive. What's the best way to do this?

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• Symantec Backup exec 2012 for SBS - moving data to offsite drives

  - by Will Lennard

  Can anyone advise how best to run the following strategy, or even if it is possible/sensible strategy? I am looking to backup an SBS server using BE2012 where the data is backed up on a weekly full backup, with subsequent daily incrementals till the end of the week, a fresh full backup will then be taken the next weekend, and the cycle repeats for 4 weeks, thus 4 full backups with incrementals. This months worth of backups will then be moved off to an offsite store via USB drive for safe keeping. Is this viable, sensible, or am i just a bit crazy? All ideas are welcome.

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• Best way to determine surface normal for a group of pixels?

  - by Paul Renton

  One of my current endeavors is creating a 2D destructible terrain engine for iOS Cocos2D (See https://github.com/crebstar/PWNDestructibleTerrain ). It is in an infant stages no doubt, but I have made significant progress since starting a couple weeks ago. However, I have run into a bit of a performance road block with calculating surface normals. Note: For my destructible terrain engine, an alpha of 0 is considered to not be solid ground. The method posted below works just great given small rectangles, such as n < 30. Anything above 30 causes a dip in the frame rate. If you approach 100x100 then you might as well read a book while the sprite attempts to traverse the terrain. At the moment this is the best I can come up with for altering the angle on a sprite as it roams across terrain (to get the angle for a sprite's orientation just take dot product of 100 * normal * (1,0) vector). -(CGPoint)getAverageSurfaceNormalAt:(CGPoint)pt withRect:(CGRect)area { float avgX = 0; float avgY = 0; ccColor4B color = ccc4(0, 0, 0, 0); CGPoint normal; float len; for (int w = area.size.width; w >= -area.size.width; w--) { for (int h = area.size.height; h >= -area.size.height; h--) { CGPoint pixPt = ccp(w + pt.x, h + pt.y); if ([self pixelAt:pixPt colorCache:&color]) { if (color.a != 0) { avgX -= w; avgY -= h; } // end inner if } // end outer if } // end inner for } // end outer for len = sqrtf(avgX * avgX + avgY * avgY); if (len == 0) { normal = ccp(avgX, avgY); } else { normal = ccp(avgX/len, avgY/len); } // end if return normal; } // end get My problem is I have sprites that require larger rectangles in order for their movement to look realistic. I considered doing a cache of all surface normals, but this lead to issues of knowing when to recalculate the surface normals and these calculations also being quite expensive (also how large should the blocks be?). Another smaller issue is I don't know how to properly treat the case when length is = 0. So I am stuck... Any advice from the community would be greatly appreciated! Is my method the best possible one? Or should I rethink the algorithm? I am new to game development and always looking to learn new tips and tricks.

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• Using Recursive SQL and XML trick to PIVOT(OK, concat) a "Document Folder Structure Relationship" table, works like MySQL GROUP_CONCAT

  - by Kevin Shyr

  I'm in the process of building out a Data Warehouse and encountered this issue along the way.In the environment, there is a table that stores all the folders with the individual level.  For example, if a document is created here:{App Path}\Level 1\Level 2\Level 3\{document}, then the DocumentFolder table would look like this:IDID_ParentFolderName1NULLLevel 121Level 232Level 3To my understanding, the table was built so that:Each proposal can have multiple documents stored at various locationsDifferent users working on the proposal will have different access level to the folder; if one user is assigned access to a folder level, she/he can see all the sub folders and their content.Now we understand from an application point of view why this table was built this way.  But you can quickly see the pain this causes the report writer to show a document link on the report.  I wasn't surprised to find the report query had 5 self outer joins, which is at the mercy of nobody creating a document that is buried 6 levels deep, and not to mention the degradation in performance.With the help of 2 posts (at the end of this post), I was able to come up with this solution:Use recursive SQL to build out the folder pathUse SQL XML trick to concat the strings.Code (a reminder, I built this code in a stored procedure.  If you copy the syntax into a simple query window and execute, you'll get an incorrect syntax error) Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* 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-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} -- Get all folders and group them by the original DocumentFolderID in PTSDocument table;WITH DocFoldersByDocFolderID(PTSDocumentFolderID_Original, PTSDocumentFolderID_Parent, sDocumentFolder, nLevel)AS (-- first member      SELECT 'PTSDocumentFolderID_Original' = d1.PTSDocumentFolderID            , PTSDocumentFolderID_Parent            , 'sDocumentFolder' = sName            , 'nLevel' = CONVERT(INT, 1000000)      FROM (SELECT DISTINCT PTSDocumentFolderID                  FROM dbo.PTSDocument_DY WITH(READPAST)            ) AS d1            INNER JOIN dbo.PTSDocumentFolder_DY AS df1 WITH(READPAST)                  ON d1.PTSDocumentFolderID = df1.PTSDocumentFolderID      UNION ALL      -- recursive      SELECT ddf1.PTSDocumentFolderID_Original            , df1.PTSDocumentFolderID_Parent            , 'sDocumentFolder' = df1.sName            , 'nLevel' = ddf1.nLevel - 1      FROM dbo.PTSDocumentFolder_DY AS df1 WITH(READPAST)            INNER JOIN DocFoldersByDocFolderID AS ddf1                  ON df1.PTSDocumentFolderID = ddf1.PTSDocumentFolderID_Parent)-- Flatten out folder path, DocFolderSingleByDocFolderID(PTSDocumentFolderID_Original, sDocumentFolder)AS (SELECT dfbdf.PTSDocumentFolderID_Original            , 'sDocumentFolder' = STUFF((SELECT '\' + sDocumentFolder                                         FROM DocFoldersByDocFolderID                                         WHERE (PTSDocumentFolderID_Original = dfbdf.PTSDocumentFolderID_Original)                                         ORDER BY PTSDocumentFolderID_Original, nLevel                                         FOR XML PATH ('')),1,1,'')      FROM DocFoldersByDocFolderID AS dfbdf      GROUP BY dfbdf.PTSDocumentFolderID_Original) And voila, I use the second CTE to join back to my original query (which is now a CTE for Source as we can now use MERGE to do INSERT and UPDATE at the same time).Each part of this solution would not solve the problem by itself because:If I don't use recursion, I cannot build out the path properly.  If I use the XML trick only, then I don't have the originating folder ID info that I need to link to the document.If I don't use the XML trick, then I don't have one row per document to show in the report.I could conceivably do this in the report function, but I'd rather not deal with the beginning or ending backslash and how to attach the document name.PIVOT doesn't do strings and UNPIVOT runs into the same problem as the above.I'm excited that each version of SQL server provides us new tools to solve old problems and/or enables us to solve problems in a more elegant wayThe 2 posts that helped me along:Recursive Queries Using Common Table ExpressionHow to use GROUP BY to concatenate strings in SQL server?

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• Remote Access to Owncloud Server

  - by John

  I'm currently trying to setup my own own-cloud server, and I've got it fully installed, configured, and accessible from within my own local network. I cannot figure out how to access it from the outside. So far I've: Successfully setup port-forwarding on my local router. I've done so via 'single port forwarding' and 'port range forwarding' Ports 80, 443, 3306 (Apache-Full and MySQL) Successfully obtained my external IP address. I've also tested this magic number from within the network at #insertIPhere/owncloud and it did work. Successfully setup the server using SQLite Successfully setup the server using MySQL Created the following exceptions in my firewall: Allow In Port 80 (Apache Full) Allow In Port 443 (Apache Full) Allow In Port 3306 (MySQL) Tried connecting from several different remote networks, as to troubleshoot something on their end As far as trying to access it, I'm doing so through Google-Chrome and Mozilla Firefox trying to reach the server through #insertIPhere/owncloud using the above public IP address. So what have I missed, and how do I access my server from outside? Thanks in advance for your help and time, and I apologize in advance for what will probably result in my noobish mistake in networking. I've looked at the official documentation. And also this question here.

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• AND is better or using Internal "IF"

  - by BDotA

  In a situation like this:" if ((metadata != null) && (metadata.TypeEnum != VariantInfoMetadata.CellTypeEnum.Status)) do you recommend to keep the code as it is above or do you think it is better to make an internal "if" statement and brake that AND into two sections where "outer if" makes sure metadata is not null and inner if does the rest of the checking. I think this way will take care of possible null refrence exception if value of metadata gets null?

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• Amazon EC2 hostnames

  - by Firefly

  I'm currently trying to setup a Tigase cluster on Amazon EC2 instances in a VPC and I'm having troubles getting it to work due to the hostnames of the instances not being "full DNS names". According to the Tigase documentation: Please note the proper DNS configuration is critical for the cluster to work correctly. Make sure the 'hostname' command returns a full DNS name on each cluster node. Can anyone explain what a full DNS name is and how I can set my instances to use one? Currently my instances get a default hostname of the form "ip-10-0-0-20".

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• Workspace Issues on ubuntu 12.10

  - by JaySch

  I'm having the following problem with 12.10 Unity running on a Toshiba A505 16" display laptop using an external 24" Samsung LED monitor (resolution 1920 x 1080 (16:9). Also using the default 2 x 2 workspaces: After powering up the laptop, I Click the Workspace Switcher and the 4 images which represent Workspace 1, Workspace 2, Workspace 3, and Workspace 4 are visible but are in a very elongated, stretched out aspect ratio. Also, any desktop icons placed on the left side of the screen don't show up when I go to full view on any of the 4 workspaces. To resolve this issue, I open up the laptop lid until the video display switches from the external Samsung LED monitor to the internal laptop display, which renders the four workspaces perfectly. I then close the laptop lid and now the workspaces display the correct aspect view; both in the workspace switcher thumbnail view an in full view. I can now see the full desktop, including any desktop icons. Is there a way to configure my system so that Workspaces work properly when the laptop is connected to an external monitor without having to open and close my laptop? Thank you.

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• Laptop battery charging capacity reduced to 52%

  - by omjaijagdish

  I have been using Ubuntu 11.04 on DELL Inspiron 14R (N5010) laptop for last three months. Before I switch to ubuntu my laptop battery used to give 2.5 hrs to 3 hrs back-up. But since I have been using ubuntu, it has been reduced to 1hr to 1.5 hrs at max. I tried following commands: $ cat /proc/acpi/battery/BAT0/state which gave result as present: yes capacity state: ok charging state: charged present rate: 1 mA remaining capacity: 4400 mAh present voltage: 12407 mV then I tried $ acpi -b the result was.. Battery 0: Unknown, 100% when I gave command as $ upower -i /org/freedesktop/UPower/devices/battery_BAT0 the result was.. native-path: /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 model: DELL W7H3N08 serial: 7114 power supply: yes updated: Sat Nov 24 11:25:34 2012 (21 seconds ago) has history: yes has statistics: yes battery present: yes rechargeable: yes state: fully-charged energy: 48.4748 Wh energy-empty: 0 Wh energy-full: 48.4748 Wh energy-full-design: 48.9595 Wh energy-rate: 0.011017 W voltage: 12.408 V percentage: 100% **capacity: 52.9253%** technology: lithium-ion Someone please let me know, what is going wrong with my laptop? How can I get charging with full capacity?

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• How to revert to Eclipse's old behavior when double-clicking on frames or windows, in Juno?

  - by mattquiros

  I find Eclipse Juno very counter-intuitive. In my workspace, I used to just have the package view at the left, my code on the right, and whenever I'm printing something in the console, that's only when the console frame shows up from the bottom right. When you double click on a particular window, it either only goes fullscreen within Eclipse, or back to its original size together with the size of the other frames. In Juno, however, it seems that frames are put on layers on top of each other. When I print something to the console, the output frame only shows up as a small, useless square to my right. When I double-click, it goes full screen. When I double-click again, it occupies the full right frame, hiding my code. I double-click again and it goes full screen, then it double-clicks before it shares the right frame with my code on top of it. Then when I minimize it, it goes to the side. Any way to go back to the good old days of Eclipse? Thanks.

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• group write permission ignored in ubuntu

  - by NorthPole

  Its probably my stupidy here but i'm stuck on this and would appreciate the help. I want my user to have full access to the local apache root folder, and i also want the apache to have full access to the same folder. What i did was create a new group called DevGroup and i added my username and www-data there. also i changed the permissions to 770 to allow full group access but now it wont allow me or the apache any kind of access to the folder. here is what i get with ls drwxrwx--- 12 root DevGroup 4096 Sep 27 17:34 testFolder which seems perfect but when i try as a user to access the file i get this var/www$ ls testFolder/ ls: cannot open directory testFolder/: Permission denied also when i try to access the a page in the folder from browser [Thu Sep 27 17:47:16 2012] [error] [client 127.0.0.1] PHP Fatal error: Unknown: Failed opening required '/var/www/testFolder/foo.php' (include_path='.:/usr/share/php:/usr/share/pear') in Unknown on line 0

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• New whitepaper: Evolution from the Traditional Data Center to Exalogic: An Operational Perspective

  - by Javier Puerta

  IT organizations are struggling with the need to balance the day-to-day concerns of data center management against the business level requirements to deliver long-term value. This balancing act has proven difficult and inefficient: systems and application management tools are resource intensive and traditional infrastructure management architectures have developed over time on a project by project basis. These traditional management systems consist of multiple tools that require administrators to waste time performing too many steps to handle routine administrative tasks. Operational efficiency and agility in your enterprise are directly linked to the capabilities provided by the management layer across the entire stack, from the application, middleware, operating system, compute, network and storage. Only when this end to end capability is provided will we experience the full benefit of a scalable, efficient, responsive and secure datacenter. Managing Exalogic is substantially less complex and error prone than managing traditional systems built from individually sourced, multi-vendor components because Exalogic is designed to be administered and maintained as a single, integrated system (Figure 1). It is at the forefront of the industry-wide shift away from costly and inferior one-off platforms toward private clouds and Engineered Systems. Read the full whitepaper "Evolution from the Traditional Data Center to Exalogic: An Operational Perspective". Full document is available for download at the Exadata Partner Community Collaborative Workspace (for community members only - if you get an error message, please register for the Community first).

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• New Whitepaper: Evolution from the Traditional Data Center to Exalogic: An Operational Perspective

  - by Javier Puerta

  IT organizations are struggling with the need to balance the day-to-day concerns of data center management against the business level requirements to deliver long-term value. This balancing act has proven difficult and inefficient: systems and application management tools are resource intensive and traditional infrastructure management architectures have developed over time on a project by project basis. These traditional management systems consist of multiple tools that require administrators to waste time performing too many steps to handle routine administrative tasks. Operational efficiency and agility in your enterprise are directly linked to the capabilities provided by the management layer across the entire stack, from the application, middleware, operating system, compute, network and storage. Only when this end to end capability is provided will we experience the full benefit of a scalable, efficient, responsive and secure datacenter. Managing Exalogic is substantially less complex and error prone than managing traditional systems built from individually sourced, multi-vendor components because Exalogic is designed to be administered and maintained as a single, integrated system (Figure 1). It is at the forefront of the industry-wide shift away from costly and inferior one-off platforms toward private clouds and Engineered Systems. Read the full whitepaper "Evolution from the Traditional Data Center to Exalogic: An Operational Perspective". Full document is available for download at the Exadata Partner Community Collaborative Workspace (for community members only - if you get an error message, please register for the Community first).

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• Can I upgrade my ubuntu version and change to be primary OS after originally installing with Wibu?

  - by Garrick Wann

  I have recently installed Ubuntu 12.04 using Wubi 12.04 and I now wish to upgrade to a full installation of Ubuntu 14.04, Before attempting to upgrade through the update center I did some research on upgrading from a Wubi installation (alongside windows) to a full installation making Ubuntu primary and only OS and found that it is in fact doable through the update center however it is just highly recommended to perform a full backup before doing so. I have now finished backing up all the data I need to worry about and began the upgrade process through the update center and received the following error: Your graphics hardware may not be fully supported in Ubuntu 14.04. Running the 'unity' desktop environment is not fully supported by your graphics hardware. You will maybe end up in a very slow environment after the upgrade. Our advice is to keep the LTS version for now. For more information see https://wiki.ubuntu.com/X/Bugs/UpdateManagerWarningForUnity3D Do you still want to continue with the upgrade? My questions are as follows: A. Isnt 14.04 a LTS version??? B, What are your recomendations in order to ensure my graphics driver is installed correctly and im not stuck with bad configs/install?

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• Should I go with Java or Python for my next project, after using PHP for 5 years? [closed]

  - by vim

  I have a full-time PHP job and I've been working with PHP for 5 years. I'm not willing to stay within this technology stack any more. I also worked with Java for 2 year before, so for me it looks more obvious to switch back to Java. However during last 5 years I was thinking about starting my own project, and now I think I have a very good SAAS idea. I'm completely confused what technology should I use for my project. I don't want to do it in PHP, and after reading many articles about rapid prototype development it seems to me that Django is the best option. I will continue to work full time for my current employer because I need to pay my bills and will work on my project in my free time. The concern I have is should I do my project in Java or Python? To be realistic there is always a risk when you are doing your own project/start-up. If I do it in Java in the worst case scenario I believe I will be able to find a full time Java position because I already have some experience in Java + recent experience in my project. With regards to Python it looks like it is not very popular in my area and salaries are much more lower then for Java. On the other hand I have a feeling that if I chose Java it will take me a way longer to finish my project. Guys I'm completely confused and I need your advice. P.S. I have moved to London 2 years ago from another country, local guys are very welcome to share their thoughts about London's job market.

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