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  • HP PDX Laptop and blu-ray region, HP MediaSmart problem

    - by Lasse V. Karlsen
    I have a laptop here, a HP HDX 16 EO1000 with a Blu-Ray drive. Installed on the machine is a software package called HP MediaSmart, which presumably can play Blu-Ray movies. However, when inserting a BD disk and starting HP MediaSmart, it comes up with a warning screen and the following message: This disc has been coded for Region B only and will not play in this machine. Please eject this disc and play on a Region B player. The question is, can we change this region? The machine is in europe, which is the B-region, but apparently the drive, or software, or both, is set to some other region. I don't even know where to find the current setting so if anyone knows, please post an answer with some information of where to look.

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  • Oracle UCM Integration with WebCenter

    - by john.brunswick
    Portal deployments always contain some level of content that requires management. Like peanut butter and jelly, the ying and yang, they are inseparable. Unfortunately, unlike peanut butter and jelly content and portals usually require that an extensive amount of work be completed to create a seamless experience for end users who will be serviced by the portal, as well as for users who will be contributing and managing the content. With WebCenter Suite Oracle has understood this need and addressed it by including Universal Content Management (UCM, formerly Stellent) licensing to allow content to be delivered into the portal from a mature, class-leading content management technology. To unlock the most value from this content technology, WebCenter portal technology can leverage a series of integration strategies available through its open standards support, as well as a series of native components to enable content consumption from UCM. This have been done to enable IT teams to reduce solution deployment time and provide quick wins to their business stakeholders. The ongoing cost of ownership for the solution is also greatly reduced through these various integrations. Within this post we will explore various ways in which the content can be Contributed through out of the box interfaces Displayed natively within the portal (configuration) Exposed programmatically (development) The information below showcases how to quickly take advantage of WebCenter's marriage of content and portal technologies, then leverage various programmatic integrations available with UCM.

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  • Change Data Capture Webinar

    I am going to be doing a webinar with our friends at Attunity on Change Data Capture.  Attunity have a good story around this technology and you can use it in your SSIS loads to great effect. Join Attunity and Konesans/SQLIS for a Webinar on 17 September Space is limited. Reserve your Webinar seat now at: https://www1.gotomeeting.com/register/693735512 Want increased efficiency and real-time speed when conducting ETL loads? Need lower implementation costs while minimizing system impact? Learn how change data capture (CDC) technologies can reduce ETL load times. Allan Mitchell, Principal Consultant at Konesans and SQLServer MVP specialising in ETL, will explain CDC concepts and benefits and how CDC can dramatically reduce ETL load times. Ian Archibald, Pre-Sales Director EMEA for Attunity, will present and demonstrate Attunity's award-winning Oracle-CDC for SSIS, a fully-integrated SSIS solution for designing, deploying and managing Oracle CDC processes. Title: Change Data Capture - Reducing ETL Load Times Date: Thursday, September 17, 2009 Time: 10:00 AM - 11:00 AM BST ABOUT THE SPEAKERS: Allan Mitchell is the joint owner of Konesans Ltd, a UK based consultancy specializing in SQL Server, and most importantly SQL Server Integration Services. Having been working with SQL Server from 6.5 onwards, he has extensive experience in many aspects of SQL Server, but now focuses on the BI suite of tools. He is a SQL Server MVP, a frequent poster on the MS SSIS/DTS newsgroups, and runs the sqldts.com and sqlis.com resource sites. Ian Archibald, Attunity Pre-Sales Director EMEA, has worked in Attunity’s UK Office for 17 years. An expert in Attunity solutions, Ian has extensive knowledge of Attunity’s products and data integration & CDC technologies. After registering you will receive a confirmation email containing information about joining the Webinar. System Requirements PC-based attendees Required: Windows® 2000, XP Home, XP Pro, 2003 Server, Vista Macintosh®-based attendees Required: Mac OS® X 10.4 (Tiger®) or newer

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  • WPF Databinding- Not your fathers databinding Part 1-3

    - by Shervin Shakibi
    As Promised here is my advanced databinding presentation from South Florida Code camp and also Orlando Code camp. you can find the demo files here. http://ssccinc.com/wpfdatabinding.zip Here is a quick description of the first demos, there will be 2 other Blogposting in the next few days getting into more advance databinding topics.   Example00 Here we have 3 textboxes, The first textbox mySourceElement Second textbox has a binding to mySourceElement and Path= Text <Binding ElementName="mySourceElement" Path="Text"  />   Third textbox is also bound to the Text property but we use inline Binding <TextBlock Text="{Binding ElementName=mySourceElement,Path=Text }" Grid.Row="2" /> Here is the entire XAML     <Grid  >           <Grid.RowDefinitions >             <RowDefinition Height="*" />             <RowDefinition Height="*" />             <RowDefinition Height="*" />         </Grid.RowDefinitions>         <TextBox Name="mySourceElement" Grid.Row="0"                  TextChanged="mySourceElement_TextChanged">Hello Orlnado</TextBox>         <TextBlock Grid.Row="1">                        <TextBlock.Text>                 <Binding ElementName="mySourceElement" Path="Text"  />             </TextBlock.Text>         </TextBlock>         <TextBlock Text="{Binding ElementName=mySourceElement,Path=Text }" Grid.Row="2" />     </Grid> </Window> Example01 we have a slider control, then we have two textboxes bound to the value property of the slider. one has its text property bound, the second has its fontsize property bound. <Grid>      <Grid.RowDefinitions >          <RowDefinition Height="40px" />          <RowDefinition Height="40px" />          <RowDefinition Height="*" />      </Grid.RowDefinitions>      <Slider Name="fontSizeSlider" Minimum="5" Maximum="100"              Value="10" Grid.Row="0" />      <TextBox Name="SizeTextBox"                    Text="{Binding ElementName=fontSizeSlider, Path=Value}" Grid.Row="1"/>      <TextBlock Text="Example 01"                 FontSize="{Binding ElementName=SizeTextBox,  Path=Text}"  Grid.Row="2"/> </Grid> Example02 very much like the previous example but it also has a font dropdown <Grid>      <Grid.RowDefinitions >          <RowDefinition Height="20px" />          <RowDefinition Height="40px" />          <RowDefinition Height="40px" />          <RowDefinition Height="*" />      </Grid.RowDefinitions>      <ComboBox Name="FontNameList" SelectedIndex="0" Grid.Row="0">          <ComboBoxItem Content="Arial" />          <ComboBoxItem Content="Calibri" />          <ComboBoxItem Content="Times New Roman" />          <ComboBoxItem Content="Verdana" />      </ComboBox>      <Slider Name="fontSizeSlider" Minimum="5" Maximum="100" Value="10" Grid.Row="1" />      <TextBox Name="SizeTextBox"      Text="{Binding ElementName=fontSizeSlider, Path=Value}" Grid.Row="2"/>      <TextBlock Text="Example 01" FontFamily="{Binding ElementName=FontNameList, Path=Text}"                 FontSize="{Binding ElementName=SizeTextBox,  Path=Text}"  Grid.Row="3"/> </Grid> Example03 In this example we bind to an object Employee.cs Notice we added a directive to our xaml which is clr-namespace and the namespace for our employee Class xmlns:local="clr-namespace:Example03" In Our windows Resources we create an instance of our object <Window.Resources>     <local:Employee x:Key="MyEmployee" EmployeeNumber="145"                     FirstName="John"                     LastName="Doe"                     Department="Product Development"                     Title="QA Manager" /> </Window.Resources> then we bind our container to the that instance of the data <Grid DataContext="{StaticResource MyEmployee}">         <Grid.RowDefinitions>             <RowDefinition Height="*" />             <RowDefinition Height="*" />             <RowDefinition Height="*" />             <RowDefinition Height="*" />             <RowDefinition Height="*" />         </Grid.RowDefinitions>         <Grid.ColumnDefinitions >             <ColumnDefinition Width="130px" />             <ColumnDefinition Width="178*" />         </Grid.ColumnDefinitions>     </Grid> and Finally we have textboxes that will bind to that textbox         <Label Grid.Row="0" Grid.Column="0">Employee Number</Label>         <TextBox Grid.Row="0" Grid.Column="1" Text="{Binding Path=EmployeeNumber}"></TextBox>         <Label Grid.Row="1" Grid.Column="0">First Name</Label>         <TextBox Grid.Row="1" Grid.Column="1" Text="{Binding Path=FirstName}"></TextBox>         <Label Grid.Row="2" Grid.Column="0">Last Name</Label>         <TextBox Grid.Row="2" Grid.Column="1" Text="{Binding Path=LastName}" />         <Label Grid.Row="3" Grid.Column="0">Title</Label>         <TextBox Grid.Row="3" Grid.Column="1" Text="{Binding Path=Title}"></TextBox>         <Label Grid.Row="4" Grid.Column="0">Department</Label>         <TextBox Grid.Row="4" Grid.Column="1" Text="{Binding Path=Department}" />

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  • How to fix error with "class" when creating a dhcp split-scope on Windows 2008?

    - by Jonas Stensved
    I'm trying to split a dhcp scope between a existing domain controller TTP01 and the new DC TTP02 to provide failover. I'm using the the wizard in DHCP [my scope] Advanced Split-scope. In the final step I get an error saying: Migration of Scope Options on Added DHCP Server: Failed Error: 0x00004E4C - The class name being used is unknown or incorrect. I can't find anything that seems to be wrong with my Scope Options settings, they are: Option Name Vendor Value Class 003 Router Standard 192.168.137.1 None 006 DNS Server Standard 192.168.137.2 None 015 DNS Domain Name Standard ttp.local None 060 PXEClient Standard PXEClient None I can't find any information about this error except this msdn article when searching. How do make it work?

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  • Smithsonian Showcases Video Game History with The Art of Video Games [Video]

    - by Jason Fitzpatrick
    The Art of Video Games is the Smithsonian’s look at the history of video games; check out this video trailer to see what the exhibition is all about and hear from some notable folks. From the Smithsonian listing for the exhibition: The Art of Video Games is one of the first exhibitions to explore the forty-year evolution of video games as an artistic medium, with a focus on striking visual effects and the creative use of new technologies. It features some of the most influential artists and designers during five eras of game technology, from early pioneers to contemporary designers. The exhibition focuses on the interplay of graphics, technology and storytelling through some of the best games for twenty gaming systems ranging from the Atari VCS to the PlayStation 3. The exhibit will be at the Smithsonian until the end of September and will then begin touring the country. Hit up the link below for more information. The Art of Video Games Tour [via Neatorama] How To Properly Scan a Photograph (And Get An Even Better Image) The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage

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  • Introducing SSIS Reporting Pack for SQL Server code-named Denali

    - by jamiet
    In recent blog posts I have introduced the new SSIS Catalog that is forthcoming in SQL Server Code-named Denali: What's new in SSIS in Denali Introduction to SSIS Projects in Denali Parameters in SSIS In Denali SSIS Server, Catalogs, Environments and Environment Variables in SSIS in Denali The SSIS Catalog is responsible for executing SSIS packages and also for capturing the metadata from those executions. However, at the time of writing there is no mechanism provided to view analyse and drill into that metadata and that is the reason that I am, in this blog post, introducing a suite of SSIS Catalog reports called the SSIS Reporting Pack which you can download from my SkyDrive at http://cid-550f681dad532637.office.live.com/self.aspx/Public/SSIS%20Reporting%20Pack/SSISReportingPack%20v0.1.zip. In this first release the SSIS Reporting Pack includes five reports: Catalog – A high-level summary of all activity in the Catalog Folders – A summary of activity in each Catalog Folder Folder – Project-level activity per single Folder Executions – A visualisation of all executions per Folder/Project/Package/Environment or subset thereof Execution – Information about an individual execution Here is a screenshot of the Executions report: Notice that the SSIS Reporting Pack provides a visual overview of all executions in the Catalog. Each execution is represented as a bar on the bar chart, the success or otherwise of each execution is indicated by the colour of the bar and the execution time is indicated by the bar height. I have recorded a video that gives an overview of the SSIS Reporting which I have embedded below. If you are having any trouble viewing the video go see it at http://vimeo.com/17617974 I must stress that this is a very early version of the SSIS Reporting Pack and I am expecting it to change a lot over the coming year. I am very keen to get some feedback about this, specifically: let me know if anything does not work as you expect give me your feature requests The easiest way to get hold of of me for now is within the comments section of this blog post. That’s all for now. I hope the SSIS Reporting Pack proves useful and I look forward to hearing your feedback. Lastly, that download link again: http://cid-550f681dad532637.office.live.com/self.aspx/Public/SSIS%20Reporting%20Pack/SSISReportingPack%20v0.1.zip. @jamiet

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  • Can't install SQL Express 2008R2- caspol.exe application error - the application failed to initialize

    - by Nir
    I'm trying to install SQL Server Express 2008 R2 on Windows 2003 Server (enterprise edition). I get the following error message: Title: caspol.exe - Application Error Text: The application failed to initialize properly (0x000007b), Click on OK to terminate the application. I get the same error message both when downloading the installer and running it and when using the web platform installer. All the pages on the internet I've found about similar problem say it's a corrupt .net installation issue - This server runs multiple .net apps and I've never had any problems with any of them. I've uninstalled and reinstalled .net (causing a painful outage) and nothing changed. Does anyone here has any idea what might cause this? Update 1: additional information I forgot to include: 32bit version of Windows running in a virtual machine, no anti virus Update 2: when running caspol.exe from the command line I get the same error

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  • Building and Deploying Windows Azure Web Sites using Git and GitHub for Windows

    - by shiju
    Microsoft Windows Azure team has released a new version of Windows Azure which is providing many excellent features. The new Windows Azure provides Web Sites which allows you to deploy up to 10 web sites  for free in a multitenant shared environment and you can easily upgrade this web site to a private, dedicated virtual server when the traffic is grows. The Meet Windows Azure Fact Sheet provides the following information about a Windows Azure Web Site: Windows Azure Web Sites enable developers to easily build and deploy websites with support for multiple frameworks and popular open source applications, including ASP.NET, PHP and Node.js. With just a few clicks, developers can take advantage of Windows Azure’s global scale without having to worry about operations, servers or infrastructure. It is easy to deploy existing sites, if they run on Internet Information Services (IIS) 7, or to build new sites, with a free offer of 10 websites upon signup, with the ability to scale up as needed with reserved instances. Windows Azure Web Sites includes support for the following: Multiple frameworks including ASP.NET, PHP and Node.js Popular open source software apps including WordPress, Joomla!, Drupal, Umbraco and DotNetNuke Windows Azure SQL Database and MySQL databases Multiple types of developer tools and protocols including Visual Studio, Git, FTP, Visual Studio Team Foundation Services and Microsoft WebMatrix Signup to Windows and Enable Azure Web Sites You can signup for a 90 days free trial account in Windows Azure from here. After creating an account in Windows Azure, go to https://account.windowsazure.com/ , and select to preview features to view the available previews. In the Web Sites section of the preview features, click “try it now” which will enables the web sites feature Create Web Site in Windows Azure To create a web sites, login to the Windows Azure portal, and select Web Sites from and click New icon from the left corner  Click WEB SITE, QUICK CREATE and put values for URL and REGION dropdown. You can see the all web sites from the dashboard of the Windows Azure portal Set up Git Publishing Select your web site from the dashboard, and select Set up Git publishing To enable Git publishing , you must give user name and password which will initialize a Git repository Clone Git Repository We can use GitHub for Windows to publish apps to non-GitHub repositories which is well explained by Phil Haack on his blog post. Here we are going to deploy the web site using GitHub for Windows. Let’s clone a Git repository using the Git Url which will be getting from the Windows Azure portal. Let’s copy the Git url and execute the “git clone” with the git url. You can use the Git Shell provided by GitHub for Windows. To get it, right on the GitHub for Windows, and select open shell here as shown in the below picture. When executing the Git Clone command, it will ask for a password where you have to give password which specified in the Windows Azure portal. After cloning the GIT repository, you can drag and drop the local Git repository folder to GitHub for Windows GUI. This will automatically add the Windows Azure Web Site repository onto GitHub for Windows where you can commit your changes and publish your web sites to Windows Azure. Publish the Web Site using GitHub for Windows We can add multiple framework level files including ASP.NET, PHP and Node.js, to the local repository folder can easily publish to Windows Azure from GitHub for Windows GUI. For this demo, let me just add a simple Node.js file named Server.js which handles few request handlers. 1: var http = require('http'); 2: var port=process.env.PORT; 3: var querystring = require('querystring'); 4: var utils = require('util'); 5: var url = require("url"); 6:   7: var server = http.createServer(function(req, res) { 8: switch (req.url) { //checking the request url 9: case '/': 10: homePageHandler (req, res); //handler for home page 11: break; 12: case '/register': 13: registerFormHandler (req, res);//hamdler for register 14: break; 15: default: 16: nofoundHandler (req, res);// handler for 404 not found 17: break; 18: } 19: }); 20: server.listen(port); 21: //function to display the html form 22: function homePageHandler (req, res) { 23: console.log('Request handler home was called.'); 24: res.writeHead(200, {'Content-Type': 'text/html'}); 25: var body = '<html>'+ 26: '<head>'+ 27: '<meta http-equiv="Content-Type" content="text/html; '+ 28: 'charset=UTF-8" />'+ 29: '</head>'+ 30: '<body>'+ 31: '<form action="/register" method="post">'+ 32: 'Name:<input type=text value="" name="name" size=15></br>'+ 33: 'Email:<input type=text value="" name="email" size=15></br>'+ 34: '<input type="submit" value="Submit" />'+ 35: '</form>'+ 36: '</body>'+ 37: '</html>'; 38: //response content 39: res.end(body); 40: } 41: //handler for Post request 42: function registerFormHandler (req, res) { 43: console.log('Request handler register was called.'); 44: var pathname = url.parse(req.url).pathname; 45: console.log("Request for " + pathname + " received."); 46: var postData = ""; 47: req.on('data', function(chunk) { 48: // append the current chunk of data to the postData variable 49: postData += chunk.toString(); 50: }); 51: req.on('end', function() { 52: // doing something with the posted data 53: res.writeHead(200, "OK", {'Content-Type': 'text/html'}); 54: // parse the posted data 55: var decodedBody = querystring.parse(postData); 56: // output the decoded data to the HTTP response 57: res.write('<html><head><title>Post data</title></head><body><pre>'); 58: res.write(utils.inspect(decodedBody)); 59: res.write('</pre></body></html>'); 60: res.end(); 61: }); 62: } 63: //Error handler for 404 no found 64: function nofoundHandler(req, res) { 65: console.log('Request handler nofound was called.'); 66: res.writeHead(404, {'Content-Type': 'text/plain'}); 67: res.end('404 Error - Request handler not found'); 68: } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } If there is any change in the local repository folder, GitHub for Windows will automatically detect the changes. In the above step, we have just added a Server.js file so that GitHub for Windows will detect the changes. Let’s commit the changes to the local repository before publishing the web site to Windows Azure. After committed the all changes, you can click publish button which will publish the all changes to Windows Azure repository. The following screen shot shows deployment history from the Windows Azure portal.   GitHub for Windows is providing a sync button which can use for synchronizing between local repository and Windows Azure repository after making any commit on the local repository after any changes. Our web site is running after the deployment using Git Summary Windows Azure Web Sites lets the developers to easily build and deploy websites with support for multiple framework including ASP.NET, PHP and Node.js and can easily deploy the Web Sites using Visual Studio, Git, FTP, Visual Studio Team Foundation Services and Microsoft WebMatrix. In this demo, we have deployed a Node.js Web Site to Windows Azure using Git. We can use GitHub for Windows to publish apps to non-GitHub repositories and can use to publish Web SItes to Windows Azure.

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  • Session Report: What’s New in JSF: A Complete Tour of JSF 2.2

    - by Janice J. Heiss
    On Wednesday, Ed Burns, Consulting Staff Member at Oracle, presented a session, CON3870 -- “What’s New in JSF: A Complete Tour of JSF 2.2,” in which he provided an update on recent developments in JavaServer Faces 2.2. He began by emphasizing that, “JavaServer Faces 2.2 continues the evolution of the Java EE standard user interface technology. Like previous releases, this iteration is very community-driven and transparent.” He pointed out that since JSF was introduced at the 2001 JavaOne Keynote, it has had a long and successful run and has found a home in applications where the UI logic resides entirely on the server where the model and UI logic is. In such cases, the browser performs fairly simple functions. However, developers can take advantage of the power of browsers, something that Project Avatar is focused on by letting developers author their applications so the UI logic is running on the client and communicating to the back end via RESTful web services. “Most importantly,” remarked Burns, “JSF 2.2 offers a really good migration path because even in the scope of one application you could have an app written with JSF that has its UI logic on the server and, on a gradual basis, you could migrate parts of the app over to use client-side technologies. This can be done at any level of granularity – per page or per collection of pages. It all depends on what you want to do.” His presentation, which focused on the basic new features of JSF 2.2, began by restating the scope of JSF and encouraged attendees to check out Roger Kitain’s session: CON5133 “Techniques for Responsive Real-Time Web UIs.” Burns explained that JSF has endured because, “We still need web apps that are maintainable, localizable, quick to build, accessible, secure, look great and are fun to use.” It is used on every continent – the curious can go here to check out where its unofficial usage is tracked. He emphasized the significance of the UI logic being substantially on the server. This: Separates Component Semantics from Rendering, Allows components to “own” their little patch of the UI -- encode/decode, And offers a well-defined lifecycle: Inversion of Control. Burns reminded attendees that JSR-344, the spec for JSF 2.2, is now on Java Community Process 2.8, a revised version of the JCP that allows for more openness and transparency. He then offered some tools for community access to JSF 2.2:    * Public java.net projects spec http://jsf-spec.java.net/ impl http://jsf.java.net/ Open Source: GPL+Classpath Exception    * Mailing Lists [email protected]                                Public readable archive, JSPA signed member read/write [email protected]                                     Public readable archive, any java.net member read/write                         All mail sent to jsr344-experts is sent to users. * Issue Tracker spec http://jsf-spec.java.net/issues/ impl http://jsf.java.net/issues/ JSF 2.2, which is JSR 344, has a Public Review Draft planned by December 2012 with no need for a Renewal Ballot. The Early Draft Review of JSR 344 was published on December 8, 2011. Interested developers are encouraged to offer their input. Six Big Ticket Features of JSF 2.2 Burns summarized the six big ticket features of JSF 2.2:* HTML5 Friendly Markup Support Pass through attributes and elements * Faces Flows* Cross Site Request Forgery Protection* Loading Facelets via ResourceHandler* File Upload Component* Multi-Templating He explained that he called it “HTML 5 friendly” because there is really nothing HTML 5 specific about it -- it could be 4. But it enables developers to use new elements that are present in HTML5 without having a JSF component library that is written to take advantage of those specifically. It gives the page author the ability to use plain HTML5 to write their page, but to still take advantage of the server-side available in JSF. He presented a demo showing JSF 2.2’s ability to leverage the expressiveness of HTML5. Burns then explained the significance of face flows, which offer function points and quantify how much work has taken place, something of great value to JSF users. He went on to talk about JSF 2.2.’s cross-site request forgery protection (CSRF) and offered details about how it protects applications against attack. Then he talked about JSF 2.2’s File Upload Component and explained that the final specification will have Ajax and non-Ajax support. The current milestone has non-Ajax support implemented. He then went on to explain its capacity to add facelets through ResourceHandler. Previously, JSF 2.0 added Facelets and ResourceHandler as disparate units; now in JSF 2.2 the two concepts are unified. Finally, he explained the concept of multi-templating in JSF 2.2 and went on to discuss more medium-level features of the release. For an easy, low maintenance way of staying in touch with JSF developments go to JSF’s Twitter page where every month or so, important updates are offered.

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  • Apache2 can't close connections with restart

    - by Theta
    I'm running a Debian webserver with Apache2 and the restart command started giving me an error. root@srv:~# service apache2 stop Stopping web server: apache2. root@srv:~# service apache2 start Starting web server: apache2(98)Address already in use: make_sock: could not bind to address [::]:80 (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs Action 'start' failed. The Apache error log may have more information. failed! Occasionally it actually will restart without a problem but usually I have to killall -9 apache2 first. Someone on the Debian IRC had me check my active apache2 connections and it turns out they aren't quitting and dozens of them are staying open. How can I get these to eventually time out?

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  • SQL SERVER – Spatial Database Queries – What About BLOB – T-SQL Tuesday #006

    - by pinaldave
    Michael Coles is one of the most interesting book authors I have ever met. He has a flair of writing complex stuff in a simple language. There are a very few people like that.  I really enjoyed reading his recent book, Expert SQL Server 2008 Encryption. I strongly suggest taking a look at it. This blog is written in response to T-SQL Tuesday #006: “What About BLOB? by Michael Coles. Spatial Database is my favorite subject. Since I did my TechEd India 2010 presentation, I have enjoyed this subject a lot. Before I continue this blog post, there are a few other blog posts, so I suggest you read them.  To help build the environment run the queries, I am going to present them in this single blog post. SQL SERVER – What is Spatial Database? – Developing with SQL Server Spatial and Deep Dive into Spatial Indexing This blog post explains the basics of Spatial Database and also provides a good introduction to Indexing concept. SQL SERVER – World Shapefile Download and Upload to Database – Spatial Database This blog post will enable you with how to load the shape file into database. SQL SERVER – Spatial Database Definition and Research Documents This blog post links to the white paper about Spatial Database written by Microsoft experts. SQL SERVER – Introduction to Spatial Coordinate Systems: Flat Maps for a Round Planet This blog post links to the white paper explaining coordinate system, as written by Microsoft experts. After reading the above listed blog posts, I am very confident that you are ready to run the following script. Once you create a database using the World Shapefile, as mentioned in the second link above,you can display the image of India just like the following. Please note that this is not an accurate political map. The boundary of this map has many errors and it is just a representation. You can run the following query to generate the map of India from the database spatial which you have created after following the instructions here. USE Spatial GO -- India Map SELECT [CountryName] ,[BorderAsGeometry] ,[Border] FROM [Spatial].[dbo].[Countries] WHERE Countryname = 'India' GO Now, let us find the longitude and latitude of the two major IT cities of India, Hyderabad and Bangalore. I find their values as the following: the values of longitude-latitude for Bangalore is 77.5833300000 13.0000000000; for Hyderabad, longitude-latitude is 78.4675900000 17.4531200000. Now, let us try to put these values on the India Map and see their location. -- Bangalore DECLARE @GeoLocation GEOGRAPHY SET @GeoLocation = GEOGRAPHY::STPointFromText('POINT(77.5833300000 13.0000000000)',4326).STBuffer(20000); -- Hyderabad DECLARE @GeoLocation1 GEOGRAPHY SET @GeoLocation1 = GEOGRAPHY::STPointFromText('POINT(78.4675900000 17.4531200000)',4326).STBuffer(20000); -- Bangalore and Hyderabad on Map of India SELECT name, [GeoLocation] FROM [IndiaGeoNames] I WHERE I.[GeoLocation].STDistance(@GeoLocation) <= 0 UNION ALL SELECT name, [GeoLocation] FROM [IndiaGeoNames] I WHERE I.[GeoLocation].STDistance(@GeoLocation1) <= 0 UNION ALL SELECT '',[Border] FROM [Spatial].[dbo].[Countries] WHERE Countryname = 'India' GO Now let us quickly draw a straight line between them. DECLARE @GeoLocation GEOGRAPHY SET @GeoLocation = GEOGRAPHY::STPointFromText('POINT(78.4675900000 17.4531200000)',4326).STBuffer(10000); DECLARE @GeoLocation1 GEOGRAPHY SET @GeoLocation1 = GEOGRAPHY::STPointFromText('POINT(77.5833300000 13.0000000000)',4326).STBuffer(10000); DECLARE @GeoLocation2 GEOGRAPHY SET @GeoLocation2 = GEOGRAPHY::STGeomFromText('LINESTRING(78.4675900000 17.4531200000, 77.5833300000 13.0000000000)',4326) SELECT name, [GeoLocation] FROM [IndiaGeoNames] I WHERE I.[GeoLocation].STDistance(@GeoLocation) <= 0 UNION ALL SELECT name, [GeoLocation] FROM [IndiaGeoNames] I1 WHERE I1.[GeoLocation].STDistance(@GeoLocation1) <= 0 UNION ALL SELECT '' name, @GeoLocation2 UNION ALL SELECT '',[Border] FROM [Spatial].[dbo].[Countries] WHERE Countryname = 'India' GO Let us use the distance function of the spatial database and find the straight line distance between this two cities. -- Distance Between Hyderabad and Bangalore DECLARE @GeoLocation GEOGRAPHY SET @GeoLocation = GEOGRAPHY::STPointFromText('POINT(78.4675900000 17.4531200000)',4326) DECLARE @GeoLocation1 GEOGRAPHY SET @GeoLocation1 = GEOGRAPHY::STPointFromText('POINT(77.5833300000 13.0000000000)',4326) SELECT @GeoLocation.STDistance(@GeoLocation1)/1000 'KM'; GO The result of above query is as displayed in following image. As per SQL Server, the distance between these two cities is 501 KM, but according to what I know, the distance between those two cities is around 562 KM by road. However, please note that roads are not straight and they have lots of turns, whereas this is a straight-line distance. What would be more accurate is the distance between these two cities by air travel. When we look at the air travel distance between Bangalore and Hyderabad, the total distance covered is 495 KM, which is very close to what SQL Server has estimated, which is 501 KM. Bravo! SQL Server has accurately provided the distance between two of the cities. SQL Server Spatial Database can be very useful simply because it is very easy to use, as demonstrated above. I appreciate your comments, so let me know what your thoughts and opinions about this are. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: Spatial Database

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  • Execute a remote command after sudo - su anotheruser in Rundeck

    - by Bera
    I'm new with Rundeck and completely amazed with it and I'm trying to execute a job and my scenario is detailed below: Rundeck is configured with ssh passwordless authentication for user master between node Server (rundeck server) and node Target (remote Solaris host) for user "master" In node Target I want to execute a script /app/acme/stopApp.sh with a user appmanager Normally and manually, when I need to run script above I proceed with ssh master@server sudo su - appmanager or simply ssh -t master@server 'sudo su - appmanager' works without password and finally run (as appmanager) /app/acme/stopApp.sh But I'm not sure how can I reproduce these steps using Rundeck. I read in some previous messages that for each job line rundeck use a new ssh connection, so the workflow below always fails for me with the messages: sudo: no tty present and no askpass program specified Remote command failed with exit status 1 Please someone could help me with some information to solve this issue. Without this functionality I wouldn't be able to introduce a little DevOps in my department. I read the user guide and admin guide but I couldn't find an easy example, neither in this forum, to follow.

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  • Envista: Coordinating Utilities with Oracle Spatial 11g

    - by stephen.garth
    It's annoying when the same streets seem to be perpetually dug up for utility construction or maintenance by your water or sewer department, electric utility, gas company or telephone company. Can't they do a better job of coordinating these activities? In this podcast, Marc Fagan, Executive VP of Product Management from Envista describes a Software-as-a-Service solution that Envista provides for utilities and public works departments to coordinate upcoming construction work, using Oracle Database 11g with Oracle Spatial. Each participating utility enters key data into the Web-based application, including when and where their work is to take place, and who to contact for more information. The data is then available on a common base map, enabling all participants to coordinate their activities, save money, and minimize inconvenience to their customers. Listen to the podcast Find out more about Oracle Spatial 11g 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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  • Sun Oracle Database Machine a román Banca Transilvaniánál

    - by Fekete Zoltán
    Oracle sajtóhír: Banca Transilvania, first institution in Romania to use Sun Oracle Database Machine (English version) Sikersztori, ügyféltörténet pdf-ben. Az Database Machine V2 megjelenését 2009 szeptemberben jelentette az Oracle. A világon az elso bank, ahol már élesben muködik a Database Machine V2, a romániai Banca Transilvania! Olvassa el a sajtóhírt. A Banca Transilvania 1,5 milló ügyféllel rendelkezik. "This system, product of Oracle and Sun, is the fastest server in the world for data storage, online transactions processing and data warehousing applications." Robert C. Rekkers, Banca Transilvania CEO, ezt nyilatkozta:"Business information is accessed 30 times faster using the new system, leading to quicker decisions and a better data base segmentation", azaz a Database Machine segítségével az üzleti kérséseket 30-szor gyorsabban tudják megválaszolni, mint a korábbi rendszerrel. Leontin Toderici, Banca Transilvania COO mondta a következot: "The acquisition price was excellent, as the costs were below those of an ordinary system", azaz a rendszer ára kiváló volt, kisebb volt a kötsége, mint a hagyományos rendszereké. Sorin Mindrutescu, az Oracle Romania vezetoje büszke arra, hogy egy romániai cég is az innovatív rendszer felhasználói között lehet.: "Oracle Exadata V2 is the result of over 30 years of experience in hardware and software development of two leader companies. I am glad that a top Romanian company is amongst the first in the world to use this innovative product." Az Exadata termékcsalád és a Database Machine kiváló eszköz OLTP rendszerek, adattárházak, konszolidációs megoldások adatbázisainak futtatására. Egy csomagban a tartalmazza a szoftvert és az "okos" hardvert, az adatfeldoldozó, a tároló (storage) komponenseket, mindezt az extrém gyors Infiniband kapcsolatokkal összekötve. A Banca Transilvani az Oracle readingi (Nagy-Britannia) központjában tesztelte a Database Machine rendszert, s a korábbi rendszernél tízszer, néhol hetvenkettoször gyorsabb teljesítményt kaptak, 10-72-szeres teljesítménynövekedés!, említette Tudor Iliescu, Trend Import - Export CEO. A központi Oracle sajtóhír: Customers Select Oracle® Exadata for Extreme Performance of Data Warehouse and OLTP Applications

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  • SQL SERVER – Solution – Challenge – Puzzle – Usage of FAST Hint

    - by pinaldave
    Earlier I had posted quick puzzle and I had received wonderful response to the same from Brad Schulz. Today we will go over the solution. The puzzle was posted here: SQL SERVER – Challenge – Puzzle – Usage of FAST Hint The question was in what condition the hint FAST will be useful. In the response to this puzzle blog post here is what SQL Server Expert Brad Schulz has pointed me to his blog post where he explain how FAST hint can be useful. I strongly recommend to read his blog post over here. With the permission of the Brad, I am reproducing following queries here. He has come up with example where FAST hint improves the performance. USE AdventureWorks GO DECLARE @DesiredDateAtMidnight DATETIME = '20010709' DECLARE @NextDateAtMidnight DATETIME = DATEADD(DAY,1,@DesiredDateAtMidnight) -- Query without FAST SELECT OrderID=h.SalesOrderID ,h.OrderDate ,h.TerritoryID ,TerritoryName=t.Name ,c.CardType ,c.CardNumber ,CardExpire=RIGHT(STR(100+ExpMonth),2)+'/'+STR(ExpYear,4) ,h.TotalDue FROM Sales.SalesOrderHeader h LEFT JOIN Sales.SalesTerritory t ON h.TerritoryID=t.TerritoryID LEFT JOIN Sales.CreditCard c ON h.CreditCardID=c.CreditCardID WHERE OrderDate>=@DesiredDateAtMidnight AND OrderDate<@NextDateAtMidnight ORDER BY h.SalesOrderID; -- Query with FAST(10) SELECT OrderID=h.SalesOrderID ,h.OrderDate ,h.TerritoryID ,TerritoryName=t.Name ,c.CardType ,c.CardNumber ,CardExpire=RIGHT(STR(100+ExpMonth),2)+'/'+STR(ExpYear,4) ,h.TotalDue FROM Sales.SalesOrderHeader h LEFT JOIN Sales.SalesTerritory t ON h.TerritoryID=t.TerritoryID LEFT JOIN Sales.CreditCard c ON h.CreditCardID=c.CreditCardID WHERE OrderDate>=@DesiredDateAtMidnight AND OrderDate<@NextDateAtMidnight ORDER BY h.SalesOrderID OPTION(FAST 10) Now when you check the execution plan for the same, you will find following visible difference. You will find query with FAST returns results with much lower cost. Thank you Brad for excellent post and teaching us something. I request all of you to read original blog post written by Brad for much more information. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Pinal Dave, Readers Contribution, Readers Question, SQL, SQL Authority, SQL Puzzle, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • SQL Developer Blitz at ODTUG Kscope12

    - by thatjeffsmith
    Oracle Development Tools User Group (ODTUG) puts on an outstanding event, and I enjoy that the content comes FIRST. Yes, the after-event parties and entertainment are first class, but I look forward most to sitting in on some excellent sessions. For Kscope12 one would expect Oracle to have a large presence, and you would be absolutely correct! The APEX team will be there in full force, and we’ll have sessions on JDeveloper, ADF, and .NET. But what I want to talk about today is our awesome line-up of coverage for Oracle SQL Developer (Surprise!) DB and Developer’s Toolbox Symposium Kris Rice or @krisrice, Product Development Manager for SQL Developer, will speak at 10AM Sunday about SQL Developer Data Modeler. Our free data modeling solution allows one to reverse engineer a data dictionary to a model, modify it, and create a script of the changes. Collaboration is an important part of any development team; with built-in subversion support, the modeler makes collaboration easy, not just possible. After the morning break, I’ll be talking about SQL Developer’s PL/SQL support. From creating your code, to debugging, tuning, testing, and documenting PL/SQL – SQL Developer fits the bill. Since I have a full hour, I should have time to do a little riff on using source control to version and manage your revisions too! At 3:15 Jagan Athreya will talk about the new integration between SQL Developer and Enterprise Manager Cloud Control 12c. Enabling developers to define changes in SQLDeveloper and allowing DBAs to promote these changes to Test and Production via Enterprise Manager will reduce errors, accelerate productivity, and help eliminate unplanned downtime. Get your SQL Developer groove on at ODTUG Kscope12! Presentations SQL Developer Tips and Tricks Monday June 25, Session 5, 4:15 pm – 5:15 pm I’ll take you through my favorite keyboard shortcuts, top 10 preferences every user should tweak, and spotlight features that the average user probably hasn’t discovered yet. My goal for this session is for everyone to take 1-2 tips they can implement immediately to save mucho time. I enjoy interacting with the audience so no two versions of this presentation are the same. Oracle SQL Developer and Data Modeler New Features When: Tuesday June 26, Session 6, 8:30 am – 9:30 am Ashley Chen, my PM-partner-in-crime, will be covering all the new features from our two latest updates. So if you’re new to SQL Developer, or you’ve been using an older version, stop by and see what new toys you have to play with. I also have a bet with Ashley that she will have more attendees than me, so be sure to show up so I can collect. Debugging PL/SQL With SQL Developer When: Wednesday June 27, Session 16, 3:00 pm – 4:00 pm Me again – sorry. This time I have an entire hour to JUST talk about PL/SQL and debugging! Should you use a watch with a break condition, or a breakpoint with a passcount? How does external debugging with a Perl script work? Can I just debug an anonymous PL/SQL block. So if debugging to you is just a DBMS_OUTPUT.PUT_LINE() call, stop by and see how our IDE can help you take things to the next level! Or is that level++? Hands-on-Training SQL Developer Soup to Nuts When: Tuesday, 8:00 AM – 9:30 AM If you learn by doing, this is the session for you. Bring your own laptop or use one of the lab machines. We’ll give you a VirtualBox OEL image running 11gR2 EE Database with all the fixin’s (that’s Southern speak for Partitioning, Advanced Compression, Tuning & Diagnostic Packs, etc), TimesTen, APEX and much more. All you have to do is login and run through our lab exercises. You can start with a model and work your way up to debugging and testing your own appliction, or you can pick and choose your lessons to suit your needs. We’ll have people on hand to help you out and answer your questions. Booth Hours We’ll be in the vendor area and have our very own ‘demo pod’ for SQL Developer. Between Kris, Ashley, and I we should be able to answer your questions or show you how to ‘do that thing’ in the tool. Or just stop by and say hello! We’ll be around the following hours’ish: Sunday, June 24, 2012 6:00 PM – 8:00 PM Monday, June 25, 2012 9:00 AM – 4:30 PM Tuesday, June 26, 2012 9:30 AM – 3:30 PM Wednesday, June 27, 2012 10:15 AM – 2:00 PM No Excuses – If You Have Questions, This is Your Chance to Get Your Answers! We’re doing just about everything outside of a scavenger hunt to bring information and value to our users. Let us know what you like, what you don’t like, and we’ll do our best to do more of the former and less of the latter!

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  • Parsing HTML Documents with the Html Agility Pack

    Screen scraping is the process of programmatically accessing and processing information from an external website. For example, a price comparison website might screen scrape a variety of online retailers to build a database of products and what various retailers are selling them for. Typically, screen scraping is performed by mimicking the behavior of a browser - namely, by making an HTTP request from code and then parsing and analyzing the returned HTML. The .NET Framework offers a variety of classes for accessing data from a remote website, namely the WebClient class and the HttpWebRequest class. These classes are useful for making an HTTP request to a remote website and pulling down the markup from a particular URL, but they offer no assistance in parsing the returned HTML. Instead, developers commonly rely on string parsing methods like String.IndexOf, String.Substring, and the like, or through the use of regular expressions. Another option for parsing HTML documents is to use the Html Agility Pack, a free, open-source library designed to simplify reading from and writing to HTML documents. The Html Agility Pack constructs a Document Object Model (DOM) view of the HTML document being parsed. With a few lines of code, developers can walk through the DOM, moving from a node to its children, or vice versa. Also, the Html Agility Pack can return specific nodes in the DOM through the use of XPath expressions. (The Html Agility Pack also includes a class for downloading an HTML document from a remote website; this means you can both download and parse an external web page using the Html Agility Pack.) This article shows how to get started using the Html Agility Pack and includes a number of real-world examples that illustrate this library's utility. A complete, working demo is available for download at the end of this article. Read on to learn more! Read More >

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  • Debugging JuniperSetupClientInstaller.exe Problems

    - by Damon
    I recently moved from Windows 7 to Windows 2008 server so I can run SharePoint on my physical machine and not through a VPC, so I've been trying to get everything re-installed on my system.  As part of that process, I tried re-establishing a connection back to one of client's corporate networks and their system prompted me to run JuniperSetupClientInstaller.exe.  Normally this runs, finishes, and you can connect to the VPN no problem.  This time, however, it failed.  Unfortunately, there were no error messages to let me know why - it just didn't work. I've had success running application in "compatability mode" so I gave that a shot - same problem.  But during the installation I noticed that JuniperSetupClientInstaller.exe unpacks a number of files into a directory (you can see the exact location in the details of the installer) and then runs a DIFFERENT application - JuniperSetupClient.exe.  If you navigate to that directory, you will see a text file named JuniperSetupClient.log that contains information about the setup process. In my case, I installed a SharePoint site on Port 3333 - which the Juniper software needs to communicate with the VPN.  There was a nice message in the log file saying the VPN software could not bind to port 3333 which quickly alerted me to the issue, and moving the site off that port number fixed the issue.  However, it would have been nice to had an error message of sorts because I spent a chunk of time futilely researching compatibility issues. 

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  • Mobile Java, shiny and new: Nokia Asha and Nokia SDK 2.0

    - by terrencebarr
    Nokia has announced a series of new S40 phones called “Asha” – mass-market devices with smart-phone features: Good-sized touch screens, 1 GHz processors, WiFi connectivity, social networking integration, and more. Prices starting around €60 retail. In case you don’t know, the S40 series is built on Java ME and has a huge deployed base in many parts of the world where price/performance is critical. Along with the new phones, Nokia is also making available the new Nokia SDK 2.0 for Java (beta), which enables developers to build rich Java applications with multi-touch, sensor support, an improved Maps API, and the Lightweight UI Toolkit (LWUIT) (more API & tools details). Furthermore, there is a host of developer information, the remote device access service, and even a porting guide to help you port your Android app to the new Asha platform. Last, but not least: More and better options to monetize your applications. Nokia has enabled in-app advertising and in-app purchasing, and improved the way applications can be discovered by customers. Nokia has seen downloads from the Nokia app store rise by 63%, now totaling billions. From what I’m hearing, the revenue opportunities on S40 for developers are often way better than what is typical for other smart-phone platforms (where competition is huge and consumers are fickle). Cheers, – Terrence Filed under: Mobile & Embedded Tagged: Asha Series, Java ME, Java ME SDK, Mobile Java, monetization, Nokia, S40

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  • IIS mystery: "Deadlock detected" periodically makes site unavailable

    - by jskunkle
    A few times a day, our vb.net (IIS 6.0) website is randomly throwing the following error and becomes completely unavailable for 5-15 minutes at a time while the application is recycled: ISAPI 'c:\windows\microsoft.net\framework\v2.0.50727\aspnet_isapi.dll' reported itself as unhealthy for the following reason: 'Deadlock detected'. The website ran for months on the exact same server in beta without problem - but the problem started over the weekend when we made the site live. The live site is under some load but less than many of our other production websites. How should I attack this problem? I've looked into orphaning the worker process and creating a dump file - but I'm not sure how to analyze that. Any advice or information is appreciated. Thanks, Shane

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  • Mount Return Code for CIFS mount

    - by laikadad101
    When I run the following command (as root or via sudo) from a bash script I get an exit status (or return code in mount man page parlance) of 1: mount -v -t cifs //nasbox/volume /tmpdir/ --verbose -o credentials=/root/cifsid & /tmp/mylog It outputs the following into the myflog file: parsing options: rw,credentials=/root/cifsid mount.cifs kernel mount options unc=//nasbox\volume,ip=192.168.1.1,user=root,pass=xxxx,ver=1,rw,credentials=/root/cifsid It mounts the volume fine but returns the exit code (from the mount man page): 1 Incorrect invocation or permissions The standard Linux log files don't contain any error information. Hence, all seems to go well but I get an exit code of 1 instead of 0. Any ideas? The -v and --verbose options are just there for debugging this problem.

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  • SQLAuthority News – Downloads Available for Microsoft SQL Server Compact 3.5

    - by pinaldave
    There are few downloads released for Microsoft SQL Server Compact 3.5. Here is quick lists of the same. Microsoft SQL Server Compact 3.5 Service Pack 2 for Windows Desktop SQL Server Compact 3.5 SP2 is an embedded database that allows developers to build robust applications for Windows desktops and mobile devices. The download contains the files for installing SQL Server Compact 3.5 SP2 and Synchronization Services for ADO.NET version 1.0 SP1 on Windows desktop. Microsoft SQL Server Compact 3.5 Service Pack 2 Server Tools SQL Server Compact 3.5 SP2 Server Tools Windows Installer (MSI) file installs replication components on the computer running the Internet Information Services (IIS) for synchronizing data with SQL Server 2005, SQL Server 2008 and SQL Server 2008 R2 November CTP. Microsoft SQL Server Compact 3.5 Service Pack 2 Books Online SQL Server Compact 3.5 is a small footprint in-process database engine that allows developers to build robust applications for Windows Desktops and Mobile Devices. This download contains the Books Online for the SP2 version of SQL Server Compact 3.5. Note: The brief description below the download link is taken from respective download page. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: SQL, SQL Authority, SQL Documentation, SQL Download, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, T SQL, Technology

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  • Netscan detected from host

    - by Etam
    I am using Hetzner's dedicated servers. Today I have got a message: We have received information that there was an attack from your server. ----- attachment ----- ########################################################################## # Netscan detected from host ?.?.?.? # ########################################################################## time protocol src_ip src_port dest_ip dest_port --------------------------------------------------------------------------- Thu Dec 6 09:52:00 2012 TCP ?.?.?.? 52204 => 68.64.12.28 21 Thu Dec 6 09:52:00 2012 TCP ?.?.?.? 53276 => 68.64.12.29 21 Thu Dec 6 09:52:00 2012 TCP ?.?.?.? 47344 => 68.64.12.30 21 ... How can I find out what is causing the problem and how do I fix it? Thanks in advance, Etam.

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  • First round playing with Memcached

    - by Shaun
    To be honest I have not been very interested in the caching before I’m going to a project which would be using the multi-site deployment and high connection and concurrency and very sensitive to the user experience. That means we must cache the output data for better performance. After looked for the Internet I finally focused on the Memcached. What’s the Memcached? I think the description on its main site gives us a very good and simple explanation. Free & open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects) from results of database calls, API calls, or page rendering. Memcached is simple yet powerful. Its simple design promotes quick deployment, ease of development, and solves many problems facing large data caches. Its API is available for most popular languages. The original Memcached was built on *nix system are is being widely used in the PHP world. Although it’s not a problem to use the Memcached installed on *nix system there are some windows version available fortunately. Since we are WISC (Windows – IIS – SQL Server – C#, which on the opposite of LAMP) it would be much easier for us to use the Memcached on Windows rather than *nix. I’m using the Memcached Win X64 version provided by NorthScale. There are also the x86 version and other operation system version.   Install Memcached Unpack the Memcached file to a folder on the machine you want it to be installed, we can see that there are only 3 files and the main file should be the “memcached.exe”. Memcached would be run on the server as a service. To install the service just open a command windows and navigate to the folder which contains the “memcached.exe”, let’s say “C:\Memcached\”, and then type “memcached.exe -d install”. If you are using Windows Vista and Windows 7 system please be execute the command through the administrator role. Right-click the command item in the start menu and use “Run as Administrator”, otherwise the Memcached would not be able to be installed successfully. Once installed successful we can type “memcached.exe -d start” to launch the service. Now it’s ready to be used. The default port of Memcached is 11211 but you can change it through the command argument. You can find the help by typing “memcached -h”.   Using Memcached Memcahed has many good and ready-to-use providers for vary program language. After compared and reviewed I chose the Memcached Providers. It’s built based on another 3rd party Memcached client named enyim.com Memcached Client. The Memcached Providers is very simple to set/get the cached objects through the Memcached servers and easy to be configured through the application configuration file (aka web.config and app.config). Let’s create a console application for the demonstration and add the 3 DLL files from the package of the Memcached Providers to the project reference. Then we need to add the configuration for the Memcached server. Create an App.config file and firstly add the section on top of it. Here we need three sections: the section for Memcached Providers, for enyim.com Memcached client and the log4net. 1: <configSections> 2: <section name="cacheProvider" 3: type="MemcachedProviders.Cache.CacheProviderSection, MemcachedProviders" 4: allowDefinition="MachineToApplication" 5: restartOnExternalChanges="true"/> 6: <sectionGroup name="enyim.com"> 7: <section name="memcached" 8: type="Enyim.Caching.Configuration.MemcachedClientSection, Enyim.Caching"/> 9: </sectionGroup> 10: <section name="log4net" 11: type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/> 12: </configSections> Then we will add the configuration for 3 of them in the App.config file. The Memcached server information would be defined under the enyim.com section since it will be responsible for connect to the Memcached server. Assuming I installed the Memcached on two servers with the default port, the configuration would be like this. 1: <enyim.com> 2: <memcached> 3: <servers> 4: <!-- put your own server(s) here--> 5: <add address="192.168.0.149" port="11211"/> 6: <add address="10.10.20.67" port="11211"/> 7: </servers> 8: <socketPool minPoolSize="10" maxPoolSize="100" connectionTimeout="00:00:10" deadTimeout="00:02:00"/> 9: </memcached> 10: </enyim.com> Memcached supports the multi-deployment which means you can install the Memcached on the servers as many as you need. The protocol of the Memcached responsible for routing the cached objects into the proper server. So it’s very easy to scale-out your system by Memcached. And then define the Memcached Providers configuration. The defaultExpireTime indicates how long the objected cached in the Memcached would be expired, the default value is 2000 ms. 1: <cacheProvider defaultProvider="MemcachedCacheProvider"> 2: <providers> 3: <add name="MemcachedCacheProvider" 4: type="MemcachedProviders.Cache.MemcachedCacheProvider, MemcachedProviders" 5: keySuffix="_MySuffix_" 6: defaultExpireTime="2000"/> 7: </providers> 8: </cacheProvider> The last configuration would be the log4net. 1: <log4net> 2: <!-- Define some output appenders --> 3: <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender"> 4: <layout type="log4net.Layout.PatternLayout"> 5: <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline"/> 6: </layout> 7: </appender> 8: <!--<threshold value="OFF" />--> 9: <!-- Setup the root category, add the appenders and set the default priority --> 10: <root> 11: <priority value="WARN"/> 12: <appender-ref ref="ConsoleAppender"> 13: <filter type="log4net.Filter.LevelRangeFilter"> 14: <levelMin value="WARN"/> 15: <levelMax value="FATAL"/> 16: </filter> 17: </appender-ref> 18: </root> 19: </log4net>   Get, Set and Remove the Cached Objects Once we finished the configuration it would be very simple to consume the Memcached servers. The Memcached Providers gives us a static class named DistCache that can be used to operate the Memcached servers. Get<T>: Retrieve the cached object from the Memcached servers. If failed it will return null or the default value. Add: Add an object with a unique key into the Memcached servers. Assuming that we have an operation that retrieve the email from the name which is time consuming. This is the operation that should be cached. The method would be like this. I utilized Thread.Sleep to simulate the long-time operation. 1: static string GetEmailByNameSlowly(string name) 2: { 3: Thread.Sleep(2000); 4: return name + "@ethos.com.cn"; 5: } Then in the real retrieving method we will firstly check whether the name, email information had been searched previously and cached. If yes we will just return them from the Memcached, otherwise we will invoke the slowly method to retrieve it and then cached. 1: static string GetEmailByName(string name) 2: { 3: var email = DistCache.Get<string>(name); 4: if (string.IsNullOrEmpty(email)) 5: { 6: Console.WriteLine("==> The name/email not be in memcached so need slow loading. (name = {0})==>", name); 7: email = GetEmailByNameSlowly(name); 8: DistCache.Add(name, email); 9: } 10: else 11: { 12: Console.WriteLine("==> The name/email had been in memcached. (name = {0})==>", name); 13: } 14: return email; 15: } Finally let’s finished the calling method and execute. 1: static void Main(string[] args) 2: { 3: var name = string.Empty; 4: while (name != "q") 5: { 6: Console.Write("==> Please enter the name to find the email: "); 7: name = Console.ReadLine(); 8:  9: var email = GetEmailByName(name); 10: Console.WriteLine("==> The email of {0} is {1}.", name, email); 11: } 12: } The first time I entered “ziyanxu” it takes about 2 seconds to get the email since there’s nothing cached. But the next time I entered “ziyanxu” it returned very quickly from the Memcached.   Summary In this post I explained a bit on why we need cache, what’s Memcached and how to use it through the C# application. The example is fairly simple but hopefully demonstrated on how to use it. Memcached is very easy and simple to be used since it gives you the full opportunity to consider what, when and how to cache the objects. And when using Memcached you don’t need to consider the cache servers. The Memcached would be like a huge object pool in front of you. The next step I’m thinking now are: What kind of data should be cached? And how to determined the key? How to implement the cache as a layer on top of the business layer so that the application will not notice that the cache is there. How to implement the cache by AOP so that the business logic no need to consider the cache. I will investigate on them in the future and will share my thoughts and results.   Hope this helps, Shaun All documents and related graphics, codes are provided "AS IS" without warranty of any kind. Copyright © Shaun Ziyan Xu. This work is licensed under the Creative Commons License.

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