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• qmail throws error "CNAME_­lookup_­failed_­temporarily"

  - by Supratik

  I am using Qmail and when I am sending mails I am sometimes getting the bellow error in my log for a particular domain. Jun 22 05:20:47 221832-web1 qmail: 1308738047.397431 delivery 1040373: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/ Can anyone please tell me what are the factors responsible for such error ? What are the DNS requests sent by Qmail when sending an email ? FYI: The patch for the DNS cache size issue is already included in Qmail.

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• Is it generally better to compress content on the proxy server or the app server?

  - by Dan

  We're using an F5 for load balancing and SSL proxying. Behind it we're serving up java applications with Tomcat instances. These are fairly small applications - hundreds of concurrent users. I'd like to compress some of the content, and I'm looking for advice on choosing to configure compression on the F5, or on the tomcat instances. Any big factors in the decision, or is it 6-of-one half-dozen of the other?

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• Sleep or Hibernate for a laptop

  - by Tim

  I was wondering whether it is better to put a laptop into sleep or hibernation in Windows 7, and suspend or hibernate in Ubuntu: when carrying the laptop in a backpack and walking or slow-running to another place in around 15 minutes, Or just when the lid is closed. My concerns are if the heat generated and accumulated and bumping from transmit will do harm to the laptop, and I can miss other important factors. Is sleep in Windows 7 same as suspend in Ubuntu? Thanks and regards!

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• Connecting via Ethernet on second AirPort Extreme

  - by b-b

  Would It be possible to connec my xbox 360 to a second AirPort Extreme, wherein this AirPort Extreme is wirelessly linked to the first? I assume it is and is straight forward, but I thought I'd ask first. Also, would an Ethernet to a second AirPort Extreme be any faster than, say, a dual band wifi connection from a MacBook? Obviously environmental factors play in, but I'm mostly curious about the relative receiving strength of the airport vs laptop.

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• How did you find your current job?

  - by sanksjaya

  I'm a student looking for a job as a Jr. Sys Admin / Information Security position. The moment I click search from simplyhired.com or dice.com my job gets complicated. It's so hard to spot the ones that you definitely want to apply for. So, just share your story of how you spot your current job online? What factors did you consider before applying? And any tips for young job seekers. Thanks :)

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• Does overheating cause a computer to slow down?

  - by anonymous coward

  It's a pet peeve of mine that people leave the tower of their desktop computers in the small enclosed cabinet part of computer desks. I've heard that heat issues can cause problems with PCs, but is this realistic? Is leaving the desktop in a cabinet area, or above-average-room-temp, a realistic potential cause of slowdowns? (I'm completely aware that there are other contributing factors to computer 'slowness', just wondering if this is a realistic problem, or mostly mental).

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• Internet connectivity

  - by user309281

  Hi All Basically want to know the different factors which will help in having faster Internet experience, ie. faster upload and download. In this, how browsers like IE, mozilla, opera play in enabling faster internet connections ?

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• Can someone access my locally ran website even if I haven't specified any port forwarding?

  - by user701510

  I am using Xampp so I can test my web application directly on my own computer. I am concerned that someone can access my Xampp site since I am still connected to the internet. However, I have NOT explicitly enabled any port forwarding with respect to my Xampp site in my router firewall settings. Furthermore, I am using a dynamic ip address. Given the factors already stated, can someone from outside my local network still access my locally ran website?

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• How should I interpret the specifications of a SSD?

  - by paulgreg

  When considering to buy a SSD, how should I interpret the different specifications of the SSD? Here are some specific things that need to be deciphered: Controller (this can affect performance and endurance more than all other factors combined) Bus Technology Form Factor (Physical Size) Capacity NAND or NOR technology Power Consumption during Read, during Write, when Idle Read/Write Burst and Sustained Throughput All of these things I would like to be explained in more detail and their actual importance in selecting an SSD.

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• How to monitor an Amazon EC2 instance

  - by sektor

  Is there a way to monitor ec2 instances without using cloudwatch? I ask this since ec2 instances are basically VPS's, and using output from commands like top, vmstat, htop in scripts may not give the clear picture as the CPU cycles are shared between other instances as well. What should one keep in mind while monitoring CPU usage on a VPS?, should one have alerts based on top load or % of CPU used by user processes coupled with other factors like processes waiting on disk io, hardware interrupts?

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• GPU Temperature comparisons between similar GPUs of the same line

  - by White Phoenix

  As a general rule of thumb, if there are two similar GPUs from the same line (i.e. an NVIDIA GTX 260 vs a NVIDIA GTX 280), will the less powerful or more powerful GPU run hotter? This is assuming all other factors stay the same - hardware configuration, cooling setup, ingame settings, etc. Or does this depend entirely upon the GPU itself? I do remember reading that the GTX 280 in this example was terribly inefficient with power and cooling.

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• Which type of motherboard i should by and why?

  - by metal gear solid

  If budged is not matter. I just need best performance with less power consumption. I can purchase any cabinet , power supply and Motherboard. Is Power supply has any relation with Form factor? Is the size of motherboard and number of Slots only difference between all form factors? Is there any difference related to performance of motherboard? Is bigger in Size (ATX) motherboard always better?

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• 100 Yen Is an Intriguing Look at Japan’s Video Arcade Culture

  - by Jason Fitzpatrick

  While the video arcade culture of the 1970s and 80s has largely vanished from the American landscape, it’s alive and well in Japan–100 Yen: A Japanese Arcade Experience is a documentary exploring Japan’s still thriving arcade sub-culture. The documentary explores aspects of Japan’s arcade gaming culture ranging from the current experiences of arcade gamers to the factors that bring them together (like limited residential spaces to game in and urban-centered lifestyles). For more information about the film, hit up the link below. For quotes from the guys behind the documentary, hit up this article at Wired magazine. 100 Yen: The Japanese Arcade Experience [via Wired] How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

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• The Interaction between Three-Tier Client/Server Model and Three-Tier Application Architecture Model

  The three-tier client/server model is a network architectural approach currently used in modern networking. This approach divides a network in to three distinct components. Three-Tier Client/Server Model Components Client Component Server Component Database Component The Client Component of the network typically represents any device on the network. A basic example of this would be computer or another network/web enabled devices that are connected to a network. Network clients request resources on the network, and are usually equipped with a user interface for the presentation of the data returned from the Server Component. This process is done through the use of various software clients, and example of this can be seen through the use of a web browser client. The web browser request information from the Server Component located on the network and then renders the results for the user to process. The Server Components of the network return data based on specific client request back to the requesting client.  Server Components also inherit the attributes of a Client Component in that they are a device on the network and that they can also request information from other Server Components. However what differentiates a Client Component from a Server Component is that a Server Component response to requests from devices on the network. An example of a Server Component can be seen in a web server. A web server listens for new requests and then interprets the request, processes the web pages, and then returns the processed data back to the web browser client so that it may render the data for the user to interpret. The Database Component of the network returns unprocessed data from databases or other resources. This component also inherits attributes from the Server Component in that it is a device on a network, it can request information from other server components and database components, and it also listens for new requests so that it can return data when needed. The three-tier client/server model is very similar to the three-tier application architecture model, and in fact the layers can be mapped to one another. Three-Tier Application Architecture Model Presentation Layer/Logic Business Layer/Logic Data Layer/Logic The Presentation Layer including its underlying logic is very similar to the Client Component of the three-tiered model. The Presentation Layer focuses on interpreting the data returned by the Business Layer as well as presents the data back to the user.  Both the Presentation Layer and the Client Component focus primarily on the user and their experience. This allows for segments of the Business Layer to be distributable and interchangeable because the Presentation Layer is not directly integrated in with Business Layer. The Presentation Layer does not care where the data comes from as long as it is in the proper format. This allows for the Presentation Layer and Business Layer to be stored on one or more different servers so that it can provide a higher availability to clients requesting data. A good example of this is a web site that uses load balancing. When a web site decides to take on the task of load balancing they must obtain a network device that sits in front of a one or machines in order to distribute the request across multiple servers. When a user comes in through the load balanced device they are redirected to a specific server based on a few factors. Common Load Balancing Factors Current Server Availability Current Server Response Time Current Server Priority The Business Layer and corresponding logic are business rules applied to data prior to it being sent to the Presentation Layer. These rules are used to manipulate the data coming from the Data Access Layer, in addition to validating any data prior to being stored in the Data Access Layer. A good example of this would be when a user is trying to create multiple accounts under one email address. The Business Layer logic can prevent duplicate accounts by enforcing a unique email for every new account before the data is even stored in the Data Access Layer. The Server Component can be directly tied to this layer in that the server typically stores and process the Business Layer before it is returned to the end-user via the Presentation Layer. In addition the Server Component can also run automated process through the Business Layer on the data in the Data Access Layer so that additional business analysis can be derived from the data that has been already collected. The Data Layer and its logic are responsible for storing information so that it can be easily retrieved. Typical in most modern applications data is stored in a database management system however data can also be in the form of files stored on a file server. In addition a database can take on one of several forms. Common Database Formats XML File Pipe Delimited File Tab Delimited File Comma Delimited File (CSV) Plain Text File Microsoft Access Microsoft SQL Server MySql Oracle Sybase The Database component of the Networking model can be directly tied to the Data Layer because this is where the Data Layer obtains the data to return back the Business Layer. The Database Component basically allows for a place on the network to store data for future use. This enables applications to save data when they can and then quickly recall the saved data as needed so that the application does not have to worry about storing the data in memory. This prevents overhead that could be created when an application must retain all data in memory. As you can see the Three-Tier Client/Server Networking Model and the Three-Tiered Application Architecture Model rely very heavily on one another to function especially if different aspects of an application are distributed across an entire network. The use of various servers and database servers are wonderful when an application has a need to distribute work across the network. Network Components and Application Layers Interaction Database components will store all data needed for the Data Access Layer to manipulate and return to the Business Layer Server Component executes the Business Layer that manipulates data so that it can be returned to the Presentation Layer Client Component hosts the Presentation Layer that  interprets the data and present it to the user

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• Google Webmasters tools search queries position

  - by user1592845

  In my website account on Google Webmasters tools, some search queries show average position 1.0. This make me understand that it should be displayed as the first result. When I search for this query I could not able to find my website's page listed as a result?! In some cases I navigate to the third or the fourth result page and I could not find it! What are factors that make my website loss its average position for a search query? and when Google webmasters tools updates their values?

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• Enabling Service Availability in WCF Services

  It is very important for the enterprise to know which services are operational at any given point. There are many factors that can affect the availability of the services, some of them are external like a database not responding or any dependant service not working. However, in some cases, you only want to know whether a service is up or down, so a simple heart-beat mechanism with Ping messages would do the trick. Unfortunately, WCF does not provide a built-in mechanism to support this functionality,...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How does Google maintain its codes?

  - by John Maxim

  Pagerank algorithm is not revealed to any of their associates programmers, but only accessible by Larry Page or maybe Sergey Brin. I wonder how do they go about managing their coding? There are times when you need to build something up and you may need more hands to help with coding, but you may also want to keep some secrets to yourself, I'm not saying I have secrets, but I wonder how do they manage their coding. I'm sure there are some ways to do it decently and professionally. The reason why friendster failed was because one of the factors they lost control over their coding part. I think this is an interesting question. But not easy to answer, maybe only a marginal knew.

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• The Ins and Outs of Effective Smart Grid Data Management

  - by caroline.yu

  Oracle Utilities and Accenture recently sponsored a one-hour Web cast entitled, "The Ins and Outs of Effective Smart Grid Data Management." Oracle and Accenture created this Web cast to help utilities better understand the types of data collected over smart grid networks and the issues associated with mapping out a coherent information management strategy. The Web cast also addressed important points that utilities must consider with the imminent flood of data that both present and next-generation smart grid components will generate. The three speakers, including Oracle Utilities' Brad Williams, focused on the key factors associated with taking the millions of data points captured in real time and implementing the strategies, frameworks and technologies that enable utilities to process, store, analyze, visualize, integrate, transport and transform data into the information required to deliver targeted business benefits. The Web cast replay is available here. The Web cast slides are available here.

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• Pair programming business logic with a non-IT person

  - by user1598390

  Have you have any experience in which a non-IT person works with a programmer during the coding process? It's like pair programming, but one person is a non-IT person that knows a lot about the business, maybe a process engineer with math background who knows how things are calculated and can understand non-idiomatic, procedural code. I've found that some procedural, domain-specific languages like PL/SQL are quite understandable by non-IT engineers. These person end up being co-authors of the code and guarantee the correctness of formulas, factors etc. I've found this kind of pair programming quite productive, this kind of engineer user feel they are also "owners" and "authors" of the code and help minimize misunderstanding in the communication process. They even help design the test cases. Is this practice common ? Does it have a name ? Have you had similar experiences ?

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• PASS Summit 2013 - A Bunch of Blog Posts Recently

  - by RickHeiges

  Recently, there have been a number of blog posts about having the 2013 PASS Summit in Seattle or elsewhere. I had a post in November about the process and some of the major factors that were on my mind. You can read it here . There is value in moving the Summit to another venue. There is value in having the Summit in the same location/venue year after year as well. Many of the posts that I read recently make excellent arguments for each. As time goes on and you hear another good argument for one...(read more)

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• PASS Summit 2013 - A Bunch of Blog Posts Recently

  - by RickHeiges

  Recently, there have been a number of blog posts about having the 2013 PASS Summit in Seattle or elsewhere. I had a post in November about the process and some of the major factors that were on my mind. You can read it here . There is value in moving the Summit to another venue. There is value in having the Summit in the same location/venue year after year as well. Many of the posts that I read recently make excellent arguments for each. As time goes on and you hear another good argument for one...(read more)

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• Why did Alan Kay say, "The Internet was so well done, but the web was by amateurs"?

  - by kalaracey

  OK, so I paraphrased. The full quote: The Internet was done so well that most people think of it as a natural resource like the Pacific Ocean, rather than something that was man-made. When was the last time a technology with a scale like that was so error-free? The Web, in comparison, is a joke. The Web was done by amateurs. -- Alan Kay. I am trying to understand the history of the Internet and the web, and this statement is hard to understand. I have read elsewhere that the Internet is now used for very different things than it was designed for, and so perhaps that factors in. What makes the Internet so well done, and what makes the web so amateurish? (Of course, Alan Kay is fallible, and no one here is Alan Kay, so we can't know precisely why he said that, but what are some possible explanations?) *See also the original interview*.

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• Why was Objective-C popularity so sudden on TIOBE index?

  - by l46kok

  I'd like to ask a question that is pretty similar to the one being asked here, but for Objective-C. According to TIOBE rankings, the rise of popularity of Objective-C is unprecedented. This is obviously tied to the popularity of Apple products, but I feel like this might be a hasty conclusion to make since it doesn't really explain the stagnant growth of Java (1. There are way more Android O/S devices distributed worldwide, 2. Java is used in virtually every platform one can imagine) Now I haven't programmed in Objective-C at all, but I'd like to ask if there are any unique features or advantages about the language itself compared to other prevalent languages such as C++, Java, C#, Python etc. What are some other factors that contributed into the rise of Objective-C in this short span of time?

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• SharePoint Content Database Sizing

  - by Sahil Malik

  SharePoint, WCF and Azure Trainings: more information SharePoint stores majority of its content in SQL Server databases. Many of these databases are concerned with the overall configuration of the system, or managed services support. However, a majority of these databases are those that accept uploaded content, or collaborative content. These databases need to be sized with various factors in mind, such as, Ability to backup/restore the content quickly, thereby allowing for quicker SLAs and isolation in event of database failure. SharePoint as a system avoids SQL transactions in many instances. It does so to avoid locks, but does so at the cost of resultant orphan data or possible data corruption. Larger databases are known to have more orphan items than smaller ones. Also smaller databases keep the problems isolated. As a result, it is very important for any project to estimate content database base sizing estimation. This is especially important in collaborative document centric projects. Not doing this upfront planning can Read full article ....

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• Mobile Developer Economics: Calling all Developers!

  - by Jacob Lehrbaum

  VisionMobile is currently soliciting feedback for the second edition of their popular Mobile Developer Economics report.  With the 2011 edition, VisionMobile is hoping to: "see how the dynamics of the developer world have changed since early 2010 and to provide more insights into app marketing, monetization and many other factors."If you have a couple of minutes, please check out the survey and provide your input.  In addition please help us spread the word to make sure that Java developers are well represented in this survey.  Thanks!

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