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• links for 2010-06-09

  - by Bob Rhubart

  Enterprise Architecture: From Incite comes Insight...: Why aren't we seeing more adoption of open source in large enterprises? (tags: ping.fm entarch opensource linux) Forms Modernization, Part 1: Motivation for change iAdvise blog (tags: ping.fm oracleace apex middleware oracle) OmniGraffle for iPad Now Supports VGA Output (Enterprise Architecture at Oracle) (tags: ping.fm entarch ipad oracle) SysAdmin access in Oracle VDI - Jaap's VDI Blog Space (tags: ping.fm virtualization sunray vdi) Securing Enterprise Data in AWS Oracle PeopleSoft Enterprise Consulting, Support and Training (tags: ping.fm cloud peoplesoft entarch) Enterprise Software Development with Java: ODTUG Kaleidoscope 2010 - preparations and sessions (tags: ping.fm oracle java oracleace) @toddbiske: Enterprise Architecture Must Assist Delivery "In most IT organizations, things get delivered through projects, and enterprise architects don’t typically play the role of project architect. At best, there is an indirect association with delivery." -- Todd Biske (tags: entarch enterprisearchitecture) @pevansgreenwood: The Rules of Enterprise IT "The rules of this game need to change if enterprise IT — as we know it — is to remain relevant in the future." -- Peter Evans Greenwood (tags: entarch enterprisearchitecture) @bex: Oracle UCM 11g Now Released! "Good news!" says Oracle ACE Director Bex Huff. "The 11g version of Oracle UCM is finally available! This version is a bit of a re-write to run on top of the WebLogic application server. Oracle has been talking about this release for some time, so I'm glad to see it finally available." (tags: oracle enteprise2.0 e20 oracleace) Marc Kelderman: SOA 11g Cloning Cloning an Oracle SOA Suite 11g environment is rather simple. Marc Kelderman shows you how. (tags: soa oracle)

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• 301 redirect from "/index.html" to root if index.html not exist

  - by Andrij Muzychka

  Can I create 301 redirect from "index.html" to root directory if file "index.html" not exist? For example: link "http://example.com/index.html" show "404 Error" page. I need 301 redirect to root directory: "http://example.com/" in .htaccess I add rule: Options +FollowSymLinks RewriteCond %{THE_REQUEST} ^.*/index.html RewriteRule ^(.*)index.html$ http://example.com/$1 [R=301,L] but it doesn't work. Can you help me solve this problem?

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• XNA extending an existing Content type

  - by Maarten

  We are doing a game in XNA that reacts to music. We need to do some offline processing of the music data and therefore we need a custom type containing the Song and some additional data: // Project AudioGameLibrary namespace AudioGameLibrary { public class GameTrack { public Song Song; public string Extra; } } We've added a Content Pipeline extension: // Project GameTrackProcessor namespace GameTrackProcessor { [ContentSerializerRuntimeType("AudioGameLibrary.GameTrack, AudioGameLibrary")] public class GameTrackContent { public SongContent SongContent; public string Extra; } [ContentProcessor(DisplayName = "GameTrack Processor")] public class GameTrackProcessor : ContentProcessor<AudioContent, GameTrackContent> { public GameTrackProcessor(){} public override GameTrackContent Process(AudioContent input, ContentProcessorContext context) { return new GameTrackContent() { SongContent = new SongProcessor().Process(input, context), Extra = "Some extra data" // Here we can do our processing on 'input' }; } } } Both the Library and the Pipeline extension are added to the Game Solution and references are also added. When trying to use this extension to load "gametrack.mp3" we run into problems however: // Project AudioGame protected override void LoadContent() { AudioGameLibrary.GameTrack gameTrack = Content.Load<AudioGameLibrary.GameTrack>("gametrack"); MediaPlayer.Play(gameTrack.Song); } The error message: Error loading "gametrack". File contains Microsoft.Xna.Framework.Media.Song but trying to load as AudioGameLibrary.GameTrack. AudioGame contains references to both AudioGameLibrary and GameTrackProcessor. Are we maybe missing other references? EDIT Selecting the correct content processor helped, it loads the audio file correctly. However, when I try to process some data, e.g: public override GameTrackContent Process(AudioContent input, ContentProcessorContext context) { int count = input.Data.Count; // With this commented out it works fine return new GameTrackContent() { SongContent = new SongProcessor().Process(input, context) }; } It crashes with the following error: Managed Debugging Assistant 'PInvokeStackImbalance' has detected a problem in 'C:\Users\Maarten\Documents\Visual Studio 2010\Projects\AudioGame\DebugPipeline\bin\Debug\DebugPipeline.exe'. Additional Information: A call to PInvoke function 'Microsoft.Xna.Framework.Content.Pipeline!Microsoft.Xna.Framework.Content.Pipeline.UnsafeNativeMethods+AudioHelper::OpenAudioFile' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature. Information from logger right before crash: Using "BuildContent" task from assembly "Microsoft.Xna.Framework.Content.Pipel ine, Version=4.0.0.0, Culture=neutral, PublicKeyToken=842cf8be1de50553". Task "BuildContent" Building gametrack.mp3 -> bin\x86\Debug\Content\gametrack.xnb Rebuilding because asset is new Importing gametrack.mp3 with Microsoft.Xna.Framework.Content.Pipeline.Mp3Imp orter Im experiencing exactly this: http://forums.create.msdn.com/forums/t/75996.aspx

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• 99 Life Hacks to Make Your Life Easier!

  - by Asian Angel

  We have featured some awesome life hacks, tips, and tricks here before on HTG ETC, but today we are back with a super compilation full of geeky ingenuity! Get ready to increase your problem solving repertoire with this terrific collection of 99 life hacks. 99 Life Hacks to make your life easier! [via BoingBoing] How Hackers Can Disguise Malicious Programs With Fake File Extensions Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer

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• Google+ Platform Office Hours: I/O Recap

  Google+ Platform Office Hours: I/O Recap This week we talked about Google I/O and reviewed some of the new Google+ platform features that were announced. Join the discussion about this session on Google+: goo.gl 0:10 - Introductions 2:55 - Stories about Google I/O 2012 #io12 8:58 - The Sun is introduced 9:40 - A brief introduction to the History API 15:56 - Sign up for the History API developer preview 17:13 - How to request a new moment type 17:54 - Abraham and the History API at #iohack 19:33 - Is the History API a Google+ write API? 21:03 - The Sun joins our office hours (Thanks Chris Ridgeway!) 24:00 - Does the history API work in a hangout yet? 24:55 - Can Google+ Pages use the history API? 26:40 - Should I use the official ruby Google API client library? 28:48 - Should I index Google+ users by their profile ID or their email address? 29:50 - Hangouts at I/O 34:58 - Will Google+ history work with Gmail? 36:05 - Does comments tracker work with events? 36:25 - When will Hangouts On Air work in Germany? 36:23 - Can we have screen capture of hangout video for use in the History API? 39:50 - Can I run more than one Hangout App simultaneously? From: GoogleDevelopers Views: 242 12 ratings Time: 41:16 More in Science & Technology

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• #altnetseattle &ndash; CQRS

  - by GeekAgilistMercenary

  This is a topic I know nothing about, and thus, may be supremely disparate notes.  Have fun translating.  : )   . . .and coolness that the session is well past capacity. Separates things form the UI and everything that needs populated is done through commands.  The domain and reports have separate storage. Events populate these stores of data, such as "sold event". What it looks like, is that the domain controls the requests by event, which would be a product order or something similar. Event sourcing is a key element of the logic. DDD (Domain Driven Design) is part of the core basis for this methodology/structure. The architecture/methodology/structure is perfect for blade style plugin hardware as needed. Good blog entry DDDD: Why I love CQRS and another Command and Query Responsibility Segregation (CQRS), more, CQRS à la Greg Young, a bit by Udi Dahan and there are more.  Google, Bing, etc are there for a reason. It appears the core underpinning architectural element of this is the break out of unique identifiable actions, or I suppose better described as events.  Those events then act upon specific pipelines such as read requests, write requests, etc.  I will be doing more research on this topic and will have something written up shortly.  At this time it seems like nothing new, just a large architectural break out of identifiable needs of the entire enterprise system.  The reporting is in one segment of the architecture, the domain is in another, hydration broken out to interfaces, and events are executed to incur events on the Reports, or what appears by the description to be events on the domain. Anyway, more to come on this later.

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• Cooking with Wessty: HTML 5 and Visual Studio

  - by David Wesst

  The hardest part about using a new technology, such as HTML 5, is getting to what features are available and the syntax. One way to learn how to use new technologies is to adapt your current development to help you use the technology in comfort of your own development environment. For .NET Web Developers, that environment is usually Visual Studio 2010. This technique intends on showing you how to get HTML 5 Intellisense working in your current version of Visual Studio 2008 or 2010, making it easier for you to start using HTML 5 features in your current .NET web development projects. Quick Note According to the Visual Web Developer team at Microsoft, the Visual Studio 2010 SP1 beta has support for both HTML 5 and CSS 3. If you are willing to try out the bleeding edge update from Microsoft, then you won’t need this technique. --- Ingredients Visual Studio 2008 or 2010 Your favourite HTML 5 compliant browser (e.g. Internet Explorer 9) Administrator privileges, or the ability to install Visual Studio Extensions in your development environment. Directions Download the HTML 5 Intellisense for Visual Studio 2008 and 2010 extension from the Visual Studio Extension Gallery. Install it. Open Visual Studio. Open up a web file, such as an HTML or ASPX file. he HTML Source Editing toolbar should have appeared. (Optional) If it did not appear, you can activate it through the main menu by selecting View, then Toolbars, and then select HTML Source Editing if it does not have a checkbox beside it. (NOTE: If there is a checkbox, then the toolbar is enabled) In the HTML Source Editing toolbar, open up the validation schema drop box, and select HTML 5. Et voila! You now have HTML 5 intellisense enabled to help you get started in adding HTML 5 awesomeness to your web sites and web applications. Optional – Setting HTML 5 Validation Options At this point, you may want to select how Visual Studio shows validation errors. You can do that in the Options Menu. To get to the Options Menu… In the main menu select Tools, then Options. In the Options window, select and expand Text Editor, then HTML, followed by selecting Validation. Resources HTML 5 Intellisense for Visual Studio 2008 and 2010 extenstion Visual Studio Extension Gallery Visual Studio 2010 SP1 Beta This post also appears at http://david.wes.st

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• Caching API Proxy Server

  - by edc1591

  I need to have a server that caches API responses and then forwards them along to a desktop app. I don't really have much experience with this, so I have a few questions. First of all, what kind of server should I get? I already use Linode for my websites, so ideally I'd like to go with them. I expect to get anywhere from 30 million to 40 million requests to my proxy server each month. Will a 512 Linode be able to support that? Also, is there any software out there that does this already, or will I have to write my own? The API responses are roughly 10 KB each on average, so doing the math, that's a lot of data each month. Should I just add more transfer to whatever server I buy, or can I somehow compress the API responses before sending them off to the user? Thanks for any help.

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• openldap search acl

  - by Patrick

  I'm trying to write an access control for OpenLDAP to allow a user to search with a certain base dn, but only get results back from certain sub dn's. I've played with lots of different rules but cant get it to work. I'm not sure its even possible. For example: I have the user with the dn uid=testuser,ou=people,dc=example,dc=com. I want this user to be able to search with a base of dc=example,dc=com and get back entries in ou=people,dc=example,dc=com. There are lots of other sub OUs under dc=example,dc=com, but only entries in ou=people should be returned (for bonus, I'd only like certain attributes to be returned as well). Can this be done?

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• Can't make SELinux context types permanent with semanage

  - by Safado

  I created a new folder at /modevasive to hold my mod_evasive scripts and for the Log Directory. I'm trying to change the context type to httpd_sys_content_t so Apache can write to the folder. I did semanage fcontext -a -t "httpd_sys_content_t" /modevasive to change the context and then restorecon -v /modevasive to enable the change, but restorecon didn't do anything. So I used chcon to change it manually, did the restorecon to see what would happen and it changed it back to default_t. semanage fcontext -l gives: /modevasive/ all files system_u:object_r:httpd_sys_content_t:s0` And looking at /etc/selinux/targeted/contexts/files/file_contexts.local gives /modevasive/ system_u:object_r:httpd_sys_content_t:s0 So why does restorecon keep setting it back to default_t?

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• Recommended workflows for Apache virtual hosts?

  - by craig zheng

  I do a lot of local web development work on my Ubuntu machine, and I'm constantly setting up virtual hosts in Apache. I don't need to do hard core server management, but I am getting tired of the repetitive process of manually adding config directives to files in /etc/apache2/sites-available/ and then updating the /etc/hosts file. Is there a more efficient or more automated way to do all this that I'm missing? Maybe something like rapache but that's actually working?

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• Working With Extended Events

  - by Fatherjack

  SQL Server 2012 has made working with Extended Events (XE) pretty simple when it comes to what sessions you have on your servers and what options you have selected and so forth but if you are like me then you still have some SQL Server instances that are 2008 or 2008 R2. For those servers there is no built-in way to view the Extended Event sessions in SSMS. I keep coming up against the same situations – Where are the xel log files? What events, actions or predicates are set for the events on the server? What sessions are there on the server already? I got tired of this being a perpetual question and wrote some TSQL to save as a snippet in SQL Prompt so that these details are permanently only a couple of clicks away. First, some history. If you just came here for the code skip down a few paragraphs and it’s all there. If you want a little time to reminisce about SQL Server then stick with me through the next paragraph or two. We are in a bit of a cross-over period currently, there are many versions of SQL Server but I would guess that SQL Server 2008, 2008 R2 and 2012 comprise the majority of installations. With each of these comes a set of management tools, of which SQL Server Management Studio (SSMS) is one. In 2008 and 2008 R2 Extended Events made their first appearance and there was no way to work with them in the SSMS interface. At some point the Extended Events guru Jonathan Kehayias (http://www.sqlskills.com/blogs/jonathan/) created the SQL Server 2008 Extended Events SSMS Addin which is really an excellent tool to ease XE session administration. This addin will install in SSMS 2008 or 2008R2 but not SSMS 2012. If you use a compatible version of SSMS then I wholly recommend downloading and using it to make your work with XE much easier. If you have SSMS 2012 installed, and there is no reason not to as it will let you work with all versions of SQL Server, then you cannot install this addin. If you are working with SQL Server 2012 then SSMS 2012 has built in functionality to manage XE sessions – this functionality does not apply for 2008 or 2008 R2 instances though. This means you are somewhat restricted and have to use TSQL to manage XE sessions on older versions of SQL Server. OK, those of you that skipped ahead for the code, you need to start from here: So, you are working with SSMS 2012 but have a SQL Server that is an earlier version that needs an XE session created or you think there is a session created but you aren’t sure, or you know it’s there but can’t remember if it is running and where the output is going. How do you find out? Well, none of the information is hidden as such but it is a bit of a wrangle to locate it and it isn’t a lot of code that is unlikely to remain in your memory. I have created two pieces of code. The first examines the SYS.Server_Event_… management views in combination with the SYS.DM_XE_… management views to give the name of all sessions that exist on the server, regardless of whether they are running or not and two pieces of TSQL code. One piece will alter the state of the session: if the session is running then the code will stop the session if executed and vice versa. The other piece of code will drop the selected session. If the session is running then the code will stop it first. Do not execute the DROP code unless you are sure you have the Create code to hand. It will be dropped from the server without a second chance to change your mind. /**************************************************************/ /***   To locate and describe event sessions on a server    ***/ /***                                                        ***/ /***   Generates TSQL to start/stop/drop sessions           ***/ /***                                                        ***/ /***        Jonathan Allen - @fatherjack                    ***/ /***                 June 2013                                ***/ /***                                                        ***/ /**************************************************************/ SELECT  [EES].[name] AS [Session Name - all sessions] ,         CASE WHEN [MXS].[name] IS NULL THEN ISNULL([MXS].[name], 'Stopped')              ELSE 'Running'         END AS SessionState ,         CASE WHEN [MXS].[name] IS NULL              THEN ISNULL([MXS].[name],                          'ALTER EVENT SESSION [' + [EES].[name]                          + '] ON SERVER STATE = START;')              ELSE 'ALTER EVENT SESSION [' + [EES].[name]                   + '] ON SERVER STATE = STOP;'         END AS ALTER_SessionState ,         CASE WHEN [MXS].[name] IS NULL              THEN ISNULL([MXS].[name],                          'DROP EVENT SESSION [' + [EES].[name]                          + '] ON SERVER; -- This WILL drop the session. It will no longer exist. Don't do it unless you are certain you can recreate it if you need it.')              ELSE 'ALTER EVENT SESSION [' + [EES].[name]                   + '] ON SERVER STATE = STOP; ' + CHAR(10)                   + '-- DROP EVENT SESSION [' + [EES].[name]                   + '] ON SERVER; -- This WILL stop and drop the session. It will no longer exist. Don't do it unless you are certain you can recreate it if you need it.'         END AS DROP_Session FROM    [sys].[server_event_sessions] AS EES         LEFT JOIN [sys].[dm_xe_sessions] AS MXS ON [EES].[name] = [MXS].[name] WHERE   [EES].[name] NOT IN ( 'system_health', 'AlwaysOn_health' ) ORDER BY SessionState GO I have excluded the system_health and AlwaysOn sessions as I don’t want to accidentally execute the drop script for these sessions that are created as part of the SQL Server installation. It is possible to recreate the sessions but that is a whole lot of aggravation I’d rather avoid. The second piece of code gathers details of running XE sessions only and provides information on the Events being collected, any predicates that are set on those events, the actions that are set to be collected, where the collected information is being logged and if that logging is to a file target, where that file is located. /**********************************************/ /***    Running Session summary                ***/ /***                                        ***/ /***    Details key values of XE sessions     ***/ /***    that are in a running state            ***/ /***                                        ***/ /***        Jonathan Allen - @fatherjack    ***/ /***        June 2013                        ***/ /***                                        ***/ /**********************************************/ SELECT  [EES].[name] AS [Session Name - running sessions] ,         [EESE].[name] AS [Event Name] ,         COALESCE([EESE].[predicate], 'unfiltered') AS [Event Predicate Filter(s)] ,         [EESA].[Action] AS [Event Action(s)] ,         [EEST].[Target] AS [Session Target(s)] ,         ISNULL([EESF].[value], 'No file target in use') AS [File_Target_UNC] -- select * FROM    [sys].[server_event_sessions] AS EES         INNER JOIN [sys].[dm_xe_sessions] AS MXS ON [EES].[name] = [MXS].[name]         INNER JOIN [sys].[server_event_session_events] AS [EESE] ON [EES].[event_session_id] = [EESE].[event_session_id]         LEFT JOIN [sys].[server_event_session_fields] AS EESF ON ( [EES].[event_session_id] = [EESF].[event_session_id]                                                               AND [EESF].[name] = 'filename'                                                               )         CROSS APPLY ( SELECT    STUFF(( SELECT  ', ' + sest.name                                         FROM    [sys].[server_event_session_targets]                                                 AS SEST                                         WHERE   [EES].[event_session_id] = [SEST].[event_session_id]                                       FOR                                         XML PATH('')                                       ), 1, 2, '') AS [Target]                     ) AS EEST         CROSS APPLY ( SELECT    STUFF(( SELECT  ', ' + [sesa].NAME                                         FROM    [sys].[server_event_session_actions]                                                 AS sesa                                         WHERE   [sesa].[event_session_id] = [EES].[event_session_id]                                       FOR                                         XML PATH('')                                       ), 1, 2, '') AS [Action]                     ) AS EESA WHERE   [EES].[name] NOT IN ( 'system_health', 'AlwaysOn_health' ) /*Optional to exclude 'out-of-the-box' traces*/ I hope that these scripts are useful to you and I would be obliged if you would keep my name in the script comments. I have no problem with you using it in production or personal circumstances, however it has no warranty or guarantee. Don’t use it unless you understand it and are happy with what it is going to do. I am not ever responsible for the consequences of executing this script on your servers.

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• How much system and business analysis should a programmer be reasonably expected to do?

  - by Rahul

  In most places I have worked for, there were no formal System or Business Analysts and the programmers were expected to perform both the roles. One had to understand all the subsystems and their interdependencies inside out. Further, one was also supposed to have a thorough knowledge of the business logic of the applications and interact directly with the users to gather requirements, answer their queries etc. In my current job, for ex, I spend about 70% time doing system analysis and only 30% time programming. I consider myself a good programmer but struggle with developing a good understanding of the business rules of a complex application. Often, this creates a handicap because while I can write efficient algorithms and thread-safe code, I lose out to guys who may be average programmers but have a much better understanding of the business processes. So I want to know - How much business and systems knowledge should a programmer have ? - How does one go about getting this knowledge in an immensely complex software system (e.g. trading applications) with several interdependent business processes but poorly documented business rules.

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• Converting encoding of multiple files with iconv (Mac OS)?

  - by Ilya Birman

  I need to convert a whole bunch of files from Windows-1251 to UTF-8. After doing 10 of them by hand in BBEdit, I got bored ;-) I found out that there is an iconv CL tool. I tried this: iconv -f WINDOWS-1251 -t UTF-8 inputfile However it seems that iconv just outputs the converted text instead of writing it to file. Also, there is no outputfile parameter for it. How do I write the changes back to original files? Thanks. Edit: Please note, that inputfile value is actually *.txt, so the solution has to work with that.

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• Migrating data from SQL Server 2000 to SQL Server 2005

  - by Muhammad Kashif Nadeem

  I have to migrate existing data which is in SQL Server 2000 to SQL Server 2005. The schema of two databases is different. For Example Locations table in SS2000 is split into two tables and has different columns. This is one time activity. After successful migration I don't need old db anymore. What is the best way to transfer data from one SQL Server to another having different schemas? I can write stored procedures to fetch data from SQL Server 2000 and insert/update tables in SQL Server 2005. What about SSIS? I don't have any experience with this and is this better to create package of SSIS because I don't need this again and need to learn it first. Thanks.

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• Evil DRY

  - by StefanSteinegger

  DRY (Don't Repeat Yourself) is a basic software design and coding principle. But there is just no silver bullet. While DRY should increase maintainability by avoiding common design mistakes, it could lead to huge maintenance problems when misunderstood. The root of the problem is most probably that many developers believe that DRY means that any piece of code that is written more then once should be made reusable. But the principle is stated as "Every piece of knowledge must have a single, unambiguous, authoritative representation within a system." So the important thing here is "knowledge". Nobody ever said "every piece of code". I try to give some examples of misusing the DRY principle. Code Repetitions by Coincidence There is code that is repeated by pure coincidence. It is not the same code because it is based on the same piece of knowledge, it is just the same by coincidence. It's hard to give an example of such a case. Just think about some lines of code the developer thinks "I already wrote something similar". Then he takes the original code, puts it into a public method, even worse into a base class where none had been there before, puts some weird arguments and some if or switch statements into it to support all special cases and calls this "increasing maintainability based on the DRY principle". The resulting "reusable method" is usually something the developer not even can give a meaningful name, because its contents isn't anything specific, it is just a bunch of code. For the same reason, nobody will really understand this piece of code. Typically this method only makes sense to call after some other method had been called. All the symptoms of really bad design is evident. Fact is, writing this kind of "reusable methods" is worse then copy pasting! Believe me. What will happen when you change this weird piece of code? You can't say what'll happen, because you can't understand what the code is actually doing. So better don't touch it anymore. Maintainability just died. Of course this problem is with any badly designed code. But because the developer tried to make this method as reusable as possible, large parts of the system get dependent on it. Completely independent parts get tightly coupled by this common piece of code. Changing on the single common place will have effects anywhere in the system, a typical symptom of too tight coupling. Without trying to dogmatically (and wrongly) apply the DRY principle, you just had a system with a weak design. Now you get a system which just can't be maintained anymore. So what can you do against it? When making code reusable, always identify the generally reusable parts of it. Find the reason why the code is repeated, find the common "piece of knowledge". If you have to search too far, it's probably not really there. Explain it to a colleague, if you can't explain or the explanation is to complicated, it's probably not worth to reuse. If you identify the piece of knowledge, don't forget to carefully find the place where it should be implemented. Reusing code is never worth giving up a clean design. Methods always need to do something specific. If you can't give it a simple and explanatory name, you did probably something weird. If you can't find the common piece of knowledge, try to make the code simpler. For instance, if you have some complicated string or collection operations within this code, write some general-purpose operations into a helper class. If your code gets simple enough, its not so bad if it can't be reused. If you are not able to find anything simple and reasonable, copy paste it. Put a comment into the code to reference the other copies. You may find a solution later. Requirements Repetitions by Coincidence Let's assume that you need to implement complex tax calculations for many countries. It's possible that some countries have very similar tax rules. These rules are still completely independent from each other, since every country can change it of its own. (Assumed that this similarity is actually by coincidence and not by political membership. There might be basic rules applying to all European countries. etc.) Let's assume that there are similarities between an Asian country and an African country. Moving the common part to a central place will cause problems. What happens if one of the countries changes its rules? Or - more likely - what happens if users of one country complain about an error in the calculation? If there is shared code, it is very risky to change it, even for a bugfix. It is hard to find requirements to be repeated by coincidence. Then there is not much you can do against the repetition of the code. What you really should consider is to make coding of the rules as simple as possible. So this independent knowledge "Tax Rules in Timbuktu" or wherever should be as pure as possible, without much overhead and stuff that does not belong to it. So you can write every independent requirement short and clean. DRYing try-catch and using Blocks This is a technical issue. Blocks like try-catch or using (e.g. in C#) are very hard to DRY. Imagine a complex exception handling, including several catch blocks. When the contents of the try block as well as the contents of the individual catch block are trivial, but the whole structure is repeated on many places in the code, there is almost no reasonable way to DRY it. try { // trivial code here using (Thingy thing = new thingy) { //trivial, but always different line of code } } catch(FooException foo) { // trivial foo handling } catch (BarException bar) { // trivial bar handling } catch { // trivial common handling } finally { // trivial finally block } The key here is that every block is trivial, so there is nothing to just move into a separate method. The only part that differs from case to case is the line of code in the body of the using block (or any other block). The situation is especially interesting if the many occurrences of this structure are completely independent: they appear in classes with no common base class, they don't aggregate each other and so on. Let's assume that this is a common pattern in service methods within the whole system. Examples of Evil DRYing in this situation: Put a if or switch statement into the method to choose the line of code to execute. There are several reasons why this is not a good idea: The close coupling of the formerly independent implementation is the strongest. Also the readability of the code and the use of a parameter to control the logic. Put everything into a method which takes a delegate as argument to call. The caller just passes his "specific line of code" to this method. The code will be very unreadable. The same maintainability problems apply as for any "Code Repetition by Coincidence" situations. Enforce a base class to all the classes where this pattern appears and use the template method pattern. It's the same readability and maintainability problem as above, but additionally complex and tightly coupled because of the base class. I would call this "Inheritance by Coincidence" which will not lead to great software design. What can you do against it: Ideally, the individual line of code is a call to a class or interface, which could be made individual by inheritance. If this would be the case, it wouldn't be a problem at all. I assume that it is no such a trivial case. Consider to refactor the error concept to make error handling easier. The last but not worst option is to keep the replications. Some pattern of code must be maintained in consistency, there is nothing we can do against it. And no reason to make it unreadable. Conclusion The DRY-principle is an important and basic principle every software developer should master. The key is to identify the "pieces of knowledge". There is code which can't be reused easily because of technical reasons. This requires quite a bit flexibility and creativity to make code simple and maintainable. It's not the problem of the principle, it is the problem of blindly applying a principle without understanding the problem it should solve. The result is mostly much worse then ignoring the principle.

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• Database Insider Newsletter Helps Oracle Achieve Maggie Award Bid

  - by jenny.gelhausen

  The Database Insider team is honored to have our monthly newsletter help Oracle be nominated as a 2010 Maggie Award finalist. The Maggie Awards, known as the "Oscars" of the periodicals, are recognition of excellence to deserving individuals and companies whose work is deemed "The Best in the West" in a wide variety of publishing categories. The list of 2010 Maggie Award finalists is impressive and includes some past champions - so win or lose, the Database Insider team is thrilled to have helped Oracle achieve this finalist nomination in the category of Best Web E-Newsletter/Trade & Consumer. Thanks to all our faithful readers and subscribers. Haven't seen our newsletter yet? Read the latest Database Insider Newsletter edition. We invite you to subscribe and joins others receiving the Oracle Database Insider Newsletter in their Inbox, click here to register to start receiving your monthly Database Insider newsletter. Under Oracle Communications check the box next to: Oracle Database Insider - All about Oracle Database features and options including news and analysis, reviews, customer stories, events, offers, and more. Monthly. See sample. var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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• Practical Approaches to increasing Virtualization Density-Part 1

  - by Girish Venkat

  Happy New year everyone!. Let me kick start the year off by talking about Virtualization density.  What is it?The number of virtual servers that a physical server can support and it's increase from the prior physical infrastructure as a percentage. Why is it important?This is important because the density should be indicative of how well the server is getting consumed?So what is wrong ?Virtualization density fails to convey the "Real usage" of a server.  Most of the hypervisor based O/S Virtualization  evangelists take pride in the fact that they are now running a Virtual Server farm of X machines compared to a Physical server farm of Y (with Y less than X obviously). The real question is - has your utilization of the server really increased or not.  In an internal study that was conducted by one of the top financial institution - the utilization of servers only went up by 15% from 30 to 45. So, this really means that just by increasing virtualization density one will not be achieving the goal of using up the servers in their server farm better.  I will write about what the possible approaches are to increase virtualization density in the next entry. 

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• Partner Infoline & Service Portal

  - by uwes

  As an EMEA-wide team we're supporting the daily work of our partners. Our team consists of 24 sales consultants, one third is specialized on the Partner Infoline. Partner Infoline's main focus is to deliver actively and reactively technical pre sales knowledge about the Oracle hardware portfolio to our partners.With infoline we assist our partners in their daily work, furthermore we help to educate our partners to be self sufficient in all aspects and questions about hardware configurations and hardware quotes. For our Infoline Service we use a ticketing system called Service Portal which is widely used within Oracle and delivers a good and stable functionality and availability. Our Infoline-Service provides answers to questions concerning technical pre-sales matters that are related to hardware and the corresponding hardware related software.* You can address these types of questions by sending them to our mailing list: [email protected] The serviceportal will send you an auto-reply including a unique reference number, which will be the identification for your request until it is closed. Depending on the complexity of the request, it might be necessary to forward it to our specialists (servers, storage, tape, Solaris etc.) located whole over Europe. In order to make the whole process smooth here are some recommendations: write your request in English; saves translation-time, when it has to be forwarded to the specialists stating clearly in the title your interest area, like for example "memory in M4000 server". one request/one subject; makes it easier to maintain and keep the correspondence clear and simple. The rule of the service is to provide an answer quick, which means the vast majority of the requests are answered within a couple of hours. However please keep in mind that some requests may need extra work by involving the appropriate person within Europe or even in US. Therefore there is no official SLA for this service. * This excludes Oracle "classic" products and post-sales support. The latter should still be addressed through MOS (http://support.oracle.com)

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• Eliminate delay between looping XNA songs?

  - by Stephane Beniak

  I'm making a game with XNA and trying to get some background music to loop correctly. Because the file is an MP3 of about 30 seconds in length, I instantiated it as a Song. I want it to loop perfectly, but even when I set the MediaPlayer.IsRepeating property to true, there is always a delay of about one second before the song starts up again. Is there any way to eliminate this delay such that the song loops instantly, so it can play more fluently?

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• Samsung 830 very slow benchmark numbers

  - by alekop

  I just bought a new SSD, and installed a fresh copy of Windows on it. I didn't see any noticeable difference in boot times, app start-up times, so I decided to benchmark it. Asus P7P55D-E Intel i5-760 Samsung 830 256GB SATA III Windows 7 Ultimate 64-bit The Windows experience index gave the drive a 7.3 rating, but real-world performance is not particularly impressive. Any ideas why the numbers are so low? UPDATE: It turns out that SATA III support is turned off by default on the P7P55D motherboard. After enabling it in BIOS (Tools - Level Up), the scores went up: Read Write Seq 325 183 4K 16 49 IOPS 32K 28K It's an improvement, but still far below what they should be for this drive.

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• Operation MVC

  - by Ken Lovely, MCSE, MCDBA, MCTS

  It was time to create a new site. I figured VS 2010 is out so I should write it using MVC and Entity Framework. I have been very happy with MVC. My boss has had me making an administration web site in MVC2 but using 2008. I think one of the greatest features of MVC is you get to work with root of the app. It is kind of like being an iron worker; you get to work with the metal, mold it from scratch. Getting my articles out of my database and onto web pages was by far easier with MVC than it was with regular ASP.NET. This code is what I use to post the article to that page. It's pretty straightforward. The link in the menu is passes the id which is simply the url to the page. It looks for that url in the database and returns the rest of the article.   DataResults dr = new DataResults(); string title = string.Empty; string article = string.Empty; foreach (var D in dr.ReturnArticle(ViewData["PageName"].ToString())) { title = D.Title; article = D.Article; } public   List<CurrentArticle> ReturnArticle(string id) { var resultlist = new List<CurrentArticle>(); DBDataContext context = new DBDataContext(); var results = from D in context.MyContents where D.MVCURL.Contains(id) select D;foreach (var result in results) { CurrentArticle ca = new CurrentArticle(); ca.Title = result.Title; ca.Article = result.Article; ca.Summary = result.Summary; resultlist.Add(ca); } return resultlist;}

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• Converting a JD Edwards Date to a System.DateTime

  - by Christopher House

  I'm working on moving some data from JD Edwards to a SQL Server database using SSIS and needed to deal with the way in which JDE stores dates.  The format is CYYDDD, where: C = century, 1 for >= 2000 and 0 for < 2000 YY = the last two digits of the year DDD = the number of the day.  Jan 1 = 1, Dec. 31 = 365 (or 366 in a leap year) The .Net base class library has lots of good support for handling dates, but nothing as specific as the JD Edwards format, so I needed to write a bit of code to translate the JDE format to System.DateTime.  The function is below: public static DateTime FromJdeDate(double jdeDate) {   DateTime convertedDate = DateTime.MinValue;   if (jdeDate >= 30001 && jdeDate <= 200000)   {     short yearValue = (short)(jdeDate / 1000d + 1900d);     short dayValue = (short)((jdeDate % 1000) - 1);     convertedDate = DateTime.Parse("01/01/" + yearValue.ToString()).AddDays(dayValue);   }   else   {     throw new ArgumentException("The value provided does not represent a valid JDE date", "jdeDate");   }   return convertedDate; }  I'd love to take credit for this myself, but this is an adaptation of a TSQL UDF that I got from another consultant at the client site.

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• Performance Alert Writing to event Log but not running program

  - by TooFat

  I followed the instructions here How to create and configure performance alerts in Windows Server 2003 to set up an alert if the available logical disk space on one of my drives goes below a certain number. I selected the option to write to the application event log and select the "run this program" option and put in the path to a script that sends me an email. If I copy the path to the script and run it everything works and I get the email. When I start the alert I can see that the limit I set is being exceeded and the logs are being written to the application log, but the email is never being sent. I have the runas user and pword set to a Domain Admin. If I make the "run this program path" to C:\Windows\System32\calc.exe" it also doesn't start up the calculator. The Performance Logs and alerts services is running as Local Admin with allow to interact with desktop. What am I doing wrong?

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• debian mysql server always down

  - by lokheart

  I am hosting a mysql server in a debian 6.0.4 server hosted in linode, the new data is frequently written into the mysql server using R, about 30-40 "write" per minute, about 7 hours a day, 5 days a week. Recently I found that the mysql server seem to down frequently, always give me error that mysql server cannot be connected through socket. I wonder if this is caused by my high demand to my mysql server, and if this can be solved. I am definitely a newbie in manage server. Please let me know if I need to provide additional information for this question in order to get it solved. Thanks.

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