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• different data with same title and keywords

  - by Junaid Saeed

  here is my scenario i have a website where i redirect my users basing upon the device they were using, lets say a user is visiting from an iPad, i take him directly to the page of iPad wallpapers, the user selects iPad version & i take the user to the gallery of wallpapers where the user can select & download any wallpaper. Every wallpaper is the required resolution, i have my reasons for doing this, now the thing is there are diff. resolution. versions of an image appearing one 5 diff. sections of my website, each having their own view page Now there is only one record in db.table for the image, and basing on the my consistent naming convention of the images, i pick the required image. this means when 5 different pages are generated in 5 categorized sections of the website, due to a shared DB record, the keywords, the titles and every single detail of the 5 pages is same besides the resolution of the image, and the section specific details that the page has and yeah the pages also have different paths like wallpapers.com\ipad-1\cars\Ferrari-dino.html wallpapers.com\ipad-2\cars\Ferrari-dino.html wallpapers.com\ipad-3\cars\Ferrari-dino.html wallpapers.com\ipad-4\cars\Ferrari-dino.html wallpapers.com\ipad-5\cars\Ferrari-dino.html now this is my scenario, How do Search Engines see it and how do they rank it? Is it a Good or Normal or Bad SEO practice? If bad how dangerous it is for my sites SEO? i need your comments on my scenario.

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• Applescript cannot find sed during application install

  - by jsmorris

  I am attempting to install an application, but the installer fails with the following error message: sh: sed: command not found and there is an Edit and OK button in the dialog, so I click the Edit button which launches the AppleScript Editor to show me the script that is executing. Running it from within the Editor doesn't work either. The first line of the script with sed is set currdir_modified to do shell script ("echo " & currdir & " | sed 's/ /\\ /g'") I went to the terminal to make sure sed was available, and it is, in /usr/bin. This sounds like a path problem, but I am not sure where to go from here. What can I do to further troubleshoot or solution this issue? I have successfully installed this app on another mac running the same OS X version, so it is specific to my mac and the application's support is not providing any more help because it is my mac's problem, not theirs.

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• I need something substantial to do [on hold]

  - by Christian Delapena

  I'm a 19 year old computer geek who was recently exposed to Linux. I know quite a bit of it now and would like to do something substantial with it. I've visited websites like openhatch where you can get started on opensource projects but I'm more interested in something Linux-specific like hosting a website or tracking some important operation. Maybe running a script that will give me data on something important. I don't know. I'm essentially bored and I want to put my knowledge and love of Linux to good use. Someone please point me in the right direction.

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• Merging multiple top-level domains into a single domain

  - by user23089

  My client had multiple top-level-domains. Each one represented an insurance program within a specific vertical. For all the sites at these alternate domains, there was a 30/70 mix of duplicate vs. original content. Some of the alternate domains ranked very well for their target keyphrase groups, where others were absent in results pages. We advised the client to merge multiple domains into their existing main domain, for usability and SEO reasons. We recently ran the merger. Here was our process: On the main domain, transfer the content such that it matches 1-for-1 content on the various alternate domains Setup Google Webmaster Tools on the main domain Push the new content on the main domain live and submit a corresponding sitemap to Google Establish 301 redirects on the alternate domains, such that each alternate domain URL points to its respective page on the main domain We did this 12 days ago, and pages (previously on the alternate domains) that had ranked well on Google have now plummeted or are entirely non-existent. Did we do the right thing by merging multiple top-level domains into a single domain? Is this initial dip in rankings normal? How soon should we expect to see it return to its normal rankings?

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• What are the best options for a root filesystem hosted on SSD under Linux

  - by stsquad

  I'm working on an embedded system which is going to be booting and hosting it's rootfs on an SSD disk. We are currently looking at using Intel X-18M SSDs. The file system structure will have a fairly static /usr section (modulo software upgrades) and an active /var and /var/log for maintaining state and logging. Given the wear-levelling done by the underlying flash does having separate partitions help or hinder? As modern SSDs appear as straight block devices and hide their mapping magic behind their firmware is there any point trying to optimise the choice of file-system that sits on-top of the SSD? Finally does enable SMART monitoring make any sense in this context or are their SSD specific ways of determining the underlying health of the storage hardware?

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• Business Analyst role in development process

  - by Ryan

  I work as a business analyst and I currently oversee much of the development efforts of an internal project. I'm responsible for the requirements, specs, and overall testing. I work closely with the developers (onshore and offshore). The offshore team produces all of the reports. Version 1.0 had a 9 month development cycle and I had about 4-5 months to test all the reports. There was the usual back and forth to get the implementation right. Version 2.0 had a much shorter development cycle (3 months). I received the first version of the reports about 3 weeks ago and noticed a lot of things wrong with it. Many of the requirements were wrong and the performance of the queries was horrendous at 5x - 6x longer than it should have been. The onshore lead developer was out and did not supervise the offshore development team in generating the reports. Without consulting management, I took a look at the SQL in the reports and was able to improve performance greatly (by a factor of 6x) which is acceptable for this version. I sent the updated queries as guidelines to the offshore team and told them they should look at doing X instead of Y to improve performance and also to fix some specific logic issues. I then spoke to my managers about this because it doesn't feel right that I was developing SQL queries, but given our time crunch I saw no other way. We were able to fix the issue quite fast which I'm happy with. Current situation: the onshore managers aren't too pleased that the offshore team did not code for performance. I know there are some things I could have done better throughout this process and I do not in any way consider myself a programmer. My question is, if an offshore team that works apart from the onshore project resources fails to deliver an acceptable release, is it appropriate to clean up their work to meet a deadline? What kind of problems could this create in the future?

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• The Spotlight is on You

  - by Claudia McDonald

  On the field or off the field, in ballet slippers or singing your heart out on stage, offering a stellar performance every time is key to holding the attention of your audience and having them come back hungry for more. Similarly, showing up to a new business meeting wearing pink tights and a tutu might be one way to holding the attention of your customer, but offering them an unmatched and ground-breaking software solution certainly will get their attention! Simply put, the Oracle Exastack program enables both ISV's and OEM's to rapidly build and deliver faster, more reliable applications. It comes as no surprise that the success of the Oracle Exastack program is centered on establishing Oracle Exadata Database Machine and Oracle Exalogic Elastic Cloud as the highest performance, lowest cost platforms available in the industry today.  But here is where the real standing-ovation-worthy facts come in. The Oracle Exadata Database Machine is the only database machine that provides extreme performance for both data warehousing and online transaction processing (OLTP) workloads, making it the ideal platform for consolidating onto private clouds. Whereas the Oracle Exalogic Elastic Cloud is an engineered hardware and software system tested and tuned by Oracle to provide the best foundation for cloud computing, while allowing Java applications, Oracle Applications and other enterprise applications to run with extreme performance. – And the crowd goes wild, ladies and gentlemen! In just four months alone, our partners have already achieved over 150 Oracle Exastack Ready milestones for Oracle Solaris, Oracle Linux, Oracle Database and Oracle WebLogic Server.  As Judson has said, “With the Oracle Exastack program, Oracle is helping partners test, tune and optimize their applications to deliver optimal performance and reliability, accelerating innovation and delivering superior value to customers." And get this, not only are their applications running faster and more efficiently, they are actually being delivered at a lower cost to customers than ever before – extreme performance well deserving of 3 consecutive arabesques! If you haven’t already, check out what some of our partners are saying about the Oracle Exastack program in this video, and find out all that is available to you today. By participating in the Oracle Exastack program, partners now have the ability to achieve Oracle Exadata Optimized, Oracle Exalogic Optimized, Oracle Exadata Ready and Oracle Exalogic Ready status for their solutions. New Oracle Exastack labs, provide OPN members with access to Oracle technical resources, on-premise facilities and remote lab environments. With Oracle Exastack Optimized, partners experience faster and more reliable applications to run on the Oracle Exadata Database Machine, as well as the long awaited Oracle Exalogic Elastic Cloud. Savvy OPN members are leveraging the Oracle Exastack Optimized program toward their advancement to Platinum or Diamond level in OPN. Partners are achieving Oracle Exadata Ready and Oracle Exalogic Ready giving them a competitive advantage and signaling to customers that their applications readily support Oracle Exadata Database Machine or Oracle Exalogic Elastic Cloud to deliver extreme performance. Get your dancing shoes on, The OPN Communications Team

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• What resources are best for staying current about information security?

  - by dr.pooter

  What types of sites do you visit, on a regular basis, to stay current on information security issues? Some examples from my list include: http://isc.sans.org/ http://www.kaspersky.com/viruswatch3 http://www.schneier.com/blog/ http://blog.fireeye.com/research/ As well as following the security heavyweights on twitter. I'm curious to hear what resources you recommend for daily monitoring. Anything specific to particular operating systems or other software. Are mailing lists still considered valuable. My goal would be to trim the cruft of all the things I'm currently subscribed to and focus on the essentials.

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• OSX Snow Leopard - Multiple httpd/apache instances for PHP 5.2 & 5.3 together

  - by iongion

  I need to run Apache with both php 5.2 and 5.3, without other webservers such as nginx, lighttpd, etc. Just Apache HTTPD. The easiest way to have both PHP 5.2 and PHP 5.3 on Apache, on the same machine, is to have them run in different webservers (or at least different webserver instances). I already do this on windows, it works flawlessly because it is easy to specify the conf file that a specific instance loads. But how can this be achieved on Mac OSX, without ditching the web server that OSX comes with built in ? The basic is to create N-ip addresses that each apache instance will bind to, for example: 192.168.0.52 - This is for apache httpd with PHP 5.2 192.168.0.53 - This is for apache httpd with PHP 5.3 (each apache will bind to its own ip address) On OSX, i don't know how to configure HTTPD to start as multiple service/daemon, with different startup httpd.conf files!

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• Animating Tile with Blitting taking up Memory.

  - by Kid

  I am trying to animate a specific tile in my 2d Array, using blitting. The animation consists of three different 16x16 sprites in a tilesheet. Now that works perfect with the code below. BUT it's causing memory leakage. Every second the FlashPlayer is taking up +140 kb more in memory. What part of the following code could possibly cause the leak: //The variable Rectangle finds where on the 2d array we should clear the pixels //Fillrect follows up by setting alpha 0 at that spot before we copy in nxt Sprite //Tiletype is a variable that holds what kind of tile the next tile in animation is //(from tileSheet) //drawTile() gets Sprite from tilesheet and copyPixels it into right position on canvas public function animateSprite():void{ tileGround.bitmapData.lock(); if(anmArray[0].tileType > 42){ anmArray[0].tileType = 40; frameCount = 0; } var rect:Rectangle = new Rectangle(anmArray[0].xtile * ts, anmArray[0].ytile * ts, ts, ts); tileGround.bitmapData.fillRect(rect, 0); anmArray[0].tileType = 40 + frameCount; drawTile(anmArray[0].tileType, anmArray[0].xtile, anmArray[0].ytile); frameCount++; tileGround.bitmapData.unlock(); } public function drawTile(spriteType:int, xt:int, yt:int):void{ var tileSprite:Bitmap = getImageFromSheet(spriteType, ts); var rec:Rectangle = new Rectangle(0, 0, ts, ts); var pt:Point = new Point(xt * ts, yt * ts); tileGround.bitmapData.copyPixels(tileSprite.bitmapData, rec, pt, null, null, true); } public function getImageFromSheet(spriteType:int, size:int):Bitmap{ var sheetColumns:int = tSheet.width/ts; var col:int = spriteType % sheetColumns; var row:int = Math.floor(spriteType/sheetColumns); var rec:Rectangle = new Rectangle(col * ts, row * ts, size, size); var pt:Point = new Point(0,0); var correctTile:Bitmap = new Bitmap(new BitmapData(size, size, false, 0)); correctTile.bitmapData.copyPixels(tSheet, rec, pt, null, null, true); return correctTile; }

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• I'm learning html and I'm confused as to how href's work. [migrated]

  - by Robolisk

  Okay so i'm learning html right now and soon css. In my html coding I have a section like this for navigation: <div id="header"> <h1>Guild Wars 2 Fanbase</h1> <ol id="navigation"> <li><a href="/">Home</a></li> <li><a href="/facts">Facts</a></li> <li><a href="/gallery">Gallery</a></li> <li><a href="/code">Coding</a> <ul><li><a href="/code/line">Lines</a></li> <li><a href="/code/comment">Comment Lines</a></li> </ul> </li> </ol></div> Now when I open up this .html file this is all layed out the way I want it too look (the mark up that is). My question is this, when I click on a link on this site (this site being this code) I get an a error saying this webpage is not found, but of course. But how do I create it so I can have the web pages working together? I'm not sure how to word it correctly. Like, do I create another .html file in the same directory so somehow when I click the link it reads from the second .html file? If you not sure what I'm asking, just let me know and I'll try to be more specific. Thank you for your help (: excuse my mistakes in grammar, not the worlds best in English, trying my best (:

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• How to protect a peer-to-peer network from inappropriate content?

  - by Mike

  I’m developing a simple peer-to-peer app in .Net which should enable users to share specific content (text and picture files). As I've learned with my last question, inappropriate content can “relatively” easily be identified / controlled in a centralized environment. But what about a peer-to-peer network, what are the best methods to protect a decentralized system from unwanted (illegal) content? At the moment I only see the following two methods: A protocol (a set of rules) defines what kind of data (e.g. only .txt and jpg-files, not bigger than 20KB etc.) can be shared over the p2p-network and all clients (peers) must implement this protocol. If a peer doesn’t, it gets blocked by other peers. Pro: easy to implement. Con: It’s not possible to define the perfect protocol (I think eMail-Spam filters have the same problem) Some kind of rating/reputation system must be implemented (similar to stackoverflow), so “bad guys” and inappropriate content can be identified / blocked by other users. Pro: Would be very accurate. Con: Would be slow and in my view technically very hard to implement. Are there other/better solutions? Any answer or comment is highly appreciated.

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• Can't play blu ray on sony vaio fz

  - by user19455

  Hi. I have a Sony Vaio FZ (VGN-FZ31M) with a blu ray drive. I have just recently purchased the 2001 Space Odissey in blu ray but haven't been able to play on my laptop. When I try to play it with WMP i get this: "Windows Media Player cannot play the DVD. The disc was created in a manner that the Player does not support." and this with VLC: "VLC cannot open MRL. Check log for details." I have once formatted the pc and done a clean install without the sony vaio recovery cd. Is it possible that it is necessary a specific blu ray driver that I have not installed? Thanks.

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• Oracle Utilities Application Framework V4.2.0.0.0 Released

  - by ACShorten

  The Oracle Utilities Application Framework V4.2.0.0.0 has been released with Oracle Utilities Customer Care And Billing V2.4. This release includes new functionality and updates to existing functionality and will be progressively released across the Oracle Utilities applications. The release is quite substantial with lots of new and exciting changes. The release notes shipped with the product includes a summary of the changes implemented in V4.2.0.0.0. They include the following: Configuration Migration Assistant (CMA) - A new data management capability to allow you to export and import Configuration Data from one environment to another with support for Approval/Rejection of individual changes. Database Connection Tagging - Additional tags have been added to the database connection to allow database administrators, Oracle Enterprise Manager and other Oracle technology the ability to monitor and use individual database connection information. Native Support for Oracle WebLogic - In the past the Oracle Utilities Application Framework used Oracle WebLogic in embedded mode, and now, to support advanced configuration and the ExaLogic platform, we are adding Native Support for Oracle WebLogic as configuration option. Native Web Services Support - In the past the Oracle Utilities Application Framework supplied a servlet to handle Web Services calls and now we offer an alternative to use the native Web Services capability of Oracle WebLogic. This allows for enhanced clustering, a greater level of Web Service standards support, enchanced security options and the ability to use the Web Services management capabilities in Oracle WebLogic to implement higher levels of management including defining additional security rules to control access to individual Web Services. XML Data Type Support - Oracle Utilities Application Framework now allows implementors to define XML Data types used in Oracle in the definition of custom objects to take advantage of XQuery and other XML features. Fuzzy Operator Support - Oracle Utilities Application Framework supports the use of the fuzzy operator in conjunction with Oracle Text to take advantage of the fuzzy searching capabilities within the database. Global Batch View - A new JMX based API has been implemented to allow JSR120 compliant consoles the ability to view batch execution across all threadpools in the Coherence based Named Cache Cluster. Portal Personalization - It is now possible to store the runtime customizations of query zones such as preferred sorting, field order and filters to reuse as personal preferences each time that zone is used. These are just the major changes and there are quite a few more that have been delivered (and more to come in the service packs!!). Over the next few weeks we will be publishing new whitepapers and new entries in this blog outlining new facilities that you want to take advantage of.

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• How to handle growing QA reporting requirements?

  - by Phillip Jackson

  Some Background: Our company is growing very quickly - in 3 years we've tripled in size and there are no signs of stopping any time soon. Our marketing department has expanded and our IT requirements have as well. When I first arrived everything was managed in Dreamweaver and Excel spreadsheets and we've worked hard to implement bug tracking, version control, continuous integration, and multi-stage deployment. It's been a long hard road, and now we need to get more organized. The Problem at Hand: Management would like to track, per-developer, who is generating the most issues at the QA stage (post unit testing, regression, and post-production issues specifically). This becomes a fine balance because many issues can't be reported granularly (e.g. per-url or per-"page") but yet that's how Management would like reporting to be broken down. Further, severity has to be taken into account. We have drafted standards for each of these areas specific to our environment. Developers don't want to be nicked for 100+ instances of an issue if it was a problem with an include or inheritance... I had a suggestion to "score" bugs based on severity... but nobody likes that. We can't enter issues for every individual module affected by a global issue. [UPDATED] The Actual Questions: How do medium sized businesses and code shops handle bug tracking, reporting, and providing useful metrics to management? What kinds of KPIs are better metrics for employee performance? What is the most common way to provide per-developer reporting as far as time-to-close, reopens, etc.? Do large enterprises ignore the efforts of the individuals and rather focus on the team? Some other questions: Is this too granular of reporting? Is this considered 'blame culture'? If you were the developer working in this environment, what would you define as a measureable goal for this year to track your progress, with the reward of achieving the goal a bonus?

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• How to reliably take Java Heap Dumps?

  - by karlcyr

  My team is running into difficulties when trying to take good heap dumps triggered by OutOfMemoryErrors. For specific reasons we are currently taking the dumps with jmap called from a bash script instead of using the HeapDumpOnOutOfMemoryError flag. We're using a 64-bit 1.6 JVM with a heap size around 3 GB. Our heap dumps fail 90% of the time (guesstimate). Is there anything we can do to improve our odds of getting a clean heap dump we can use to troubleshoot memory problems? I have read that jmap had major issues in Java 1.4 but that those issues should be mostly addressed now.

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• Friday Fun: Doom Triple Pack

  - by Mysticgeek

  Thankfully it was only a 4 day work week, but that is enough to get sick of the TPS reports. Today we go retro and experience three classic first-person PC shooter games with the Doom Triple Pack. Doom Triple Pack The Doom Triple Pack brings you your favorite classic first-person PC shooter games in Flash format. The games include Doom, Heretic, and Hexen…just select which one you want to play. Click on Controls to learn how to navigate your characters through the games.   Each on has in-game options you can use to control the style of play. The ever famous DOOM…each game runs smoothly for what they are provided you have a decent internet connection. If you’re tired of spreadsheets and meetings and want to live some of you favorite retro PC gaming days, the Doom Triple Pack can be a lot of fun. If you’re looking for other fun ways to waste time at the office check out the games in the How-To Geek Arcade. Play the Doom Triple Pack Similar Articles Productive Geek Tips Transform your XP Computer to a Modern LookSupport for Some Versions of Windows is EndingSet Automatic Defrag Options for All Drives in Vista Service Pack 1Friday Fun: Portal, the Flash VersionHow to Play .OGM Video Files in Windows Vista TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips Xobni Plus for Outlook All My Movies 5.9 CloudBerry Online Backup 1.5 for Windows Home Server Snagit 10 Use ILovePDF To Split and Merge PDF Files TimeToMeet is a Simple Online Meeting Planning Tool Easily Create More Bookmark Toolbars in Firefox Filevo is a Cool File Hosting & Sharing Site Get a free copy of WinUtilities Pro 2010 World Cup Schedule

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• C# - How to store and reuse queries

  - by Jason Holland

  I'm learning C# by programming a real monstrosity of an application for personal use. Part of my application uses several SPARQL queries like so: const string ArtistByRdfsLabel = @" PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT DISTINCT ?artist WHERE {{ {{ ?artist rdf:type <http://dbpedia.org/ontology/MusicalArtist> . ?artist rdfs:label ?rdfsLabel . }} UNION {{ ?artist rdf:type <http://dbpedia.org/ontology/Band> . ?artist rdfs:label ?rdfsLabel . }} FILTER ( str(?rdfsLabel) = '{0}' ) }}"; string Query = String.Format(ArtistByRdfsLabel, Artist); I don't like the idea of keeping all these queries in the same class that I'm using them in so I thought I would just move them into their own dedicated class to remove clutter in my RestClient class. I'm used to working with SQL Server and just wrapping every query in a stored procedure but since this is not SQL Server I'm scratching my head on what would be the best for these SPARQL queries. Are there any better approaches to storing these queries using any special C# language features (or general, non C# specific, approaches) that I may not already know about?

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• Flushing disk cache for performance benchmarks?

  - by Ido Hadanny

  I'm doing some performance benchmark on some heavy SQL script running on postgres 8.4 on a ubuntu box (natty). I'm experiencing some pretty un-stable performance, even though I'm supposed to be the only one running on the machine (the same script on the exact same data might run in 20m and then 40m for no specific reason). So, remembering my distant DBA training, I decided I should flush the postgres cache, using sudo /etc/init.d/postgresql restart, but it's still shaky! My question: maybe I'm missing some caches in my disk/os? I'm using a netapp appliance as my storage. Am I on the right track? Do I even want to make sure I get repeatable performance before I start tuning?

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• Using XML as data storage

  - by Kian Mayne

  I was thinking about the XML format and the following quote: “XML is not a database. It was never meant to be a database. It is never going to be a database. Relational databases are proven technology with more than 20 years of implementation experience. They are solid, stable, useful products. They are not going away. XML is a very useful technology for moving data between different databases or between databases and other programs. However, it is not itself a database. Don't use it like one.“ -Effective XML: 50 Specific Ways to Improve Your XML by Elliotte Rusty Harold (page 230, Part 4, Item 41, 2nd paragraph) This seems to really stress that XML should not be used for data storage and should only be used for program to program interoperability. Personally, I disagree and .NET's app.config file that's used to store a program's settings is an example of data storage in an XML file. However for databases rather than configurations etc XML should not be used. To develop my point, I will use two examples: A) Data about customers with fields that are all on one level i.e. there are a number of fields all relating to one customer with no children B) Data about configuration of an application where nested fields and properties make a lot of sense So my question is, Is this still a valid statement and is it now acceptable to store data using XML? EDIT: I've sent an email to the author of that quote to ask for his input/extra context.

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• Create manual IPSec policy on Window (like spdadd and add on Linux)

  - by hapalibashi

  Hello On Linux it is possible to create an a manual IPSec (no IKE etc) tunnel thus: spdadd 192.168.0.10/32[5066] 192.168.0.11/32[5064] udp -P in ipsec esp/transport//require; add 192.168.0.10 192.168.0.11 esp 2222 -m transport -E des-ede3-cbc "123456789012123456789012" -A hmac-md5 "1234567890123456"; I need to do the same on Windows. I am aware of netsh but I don't think its equivalent, I need to specific the SPI (thats the 2222 above) and this seems impossible. Any ideas or alternatives?! Thanks, Stuart.

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• No sound from Java web applet

  - by Tom Savage

  Using Google Chrome and Mozilla Firefox browsers on Ubuntu 9.10, I am unable to get any sound out from Java (version 6 update 15) on Runescape or WebSDR. I'm only interested in getting WebSDR working and Runescape was the only other web applet I knew would have sound. Sound does work in a test applet I downloaded when run from the command line so it seems to be a web specific issue. Anyone else encountered or solved this or a similar issue? Are there any better applets out there that I can use to test my sound?

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• CloudFormation - How to start a Windows Service with cfn-init

  - by Edwin

  I'm creating a CloudFormation Stack that will install and start a service on a Windows Instance. I've figured out how to install the service, but how do I start the service using cfn-init? The examples seem to all use linux, as there is a reference to "sysvinit" How do I structure AWS::CloudFormation::Init so that cfn-init will start windows services after installing them? Do I leave in the sysvinit, replace it with something else, take it out? ps: I'm referring to how to start services by providing information to AWS::CloudFormation::Init.services. Also, It would be nice to know how "packages" work for windows. AWS's announcemnet says that packages are supported on Windows but there is no Windows specific documentation

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• How do the routers communicate with each other ?

  - by Berkay

  Let's say that i want make a request a to a web page which is hosted in Europe (i live in USA).My packets only consist the IP address of the web page, first the domain name to ip address transformation is done, then my packets start their journey through to europe. i assume that MAC addresses never used in this situation? are they? First, my packets deal with many routers on way how these routers communicate with each other?, are router addresses added to my packet headers ? Second, is there a specific path router to router comminication or which conditions affect this route? Third to cross the Atlantic Ocean, are cables used or... ?

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• What is the best practice for when to check if something needs to be done?

  - by changokun

  Let's say I have a function that does x. I pass it a variable, and if the variable is not null, it does some action. And I have an array of variables and I'm going to run this function on each one. Inside the function, it seems like a good practice is to check if the argument is null before proceeding. A null argument is not an error, it just causes an early return. I could loop through the array and pass each value to the function, and the function will work great. Is there any value to checking if the var is null and only calling the function if it is not null during the loop? This doubles up on the checking for null, but: Is there any gained value? Is there any gain on not calling a function? Any readability gain on the loop in the parent code? For the sake of my question, let's assume that checking for null will always be the case. I can see how checking for some object property might change over time, which makes the first check a bad idea. Pseudo code example: for(thing in array) { x(thing) } Versus: for(thing in array) { if(thing not null) x(thing) } If there are language-specific concerns, I'm a web developer working in PHP and JavaScript.

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