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  • Understanding Off Page Optimisation

    Many website owners who are doing their own SEO may have amazing content that is really well optimised, all the keywords in the right locations and the right amount and all live links but still have poor search engine rankings. What they sometimes miss off is "off the page optimisations".

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  • Free eBook: Understanding SQL Server Concurrency

    When you can’t get to your data because another application has it locked, a thorough knowledge of SQL Server concurrency will give you the confidence to decide what to do. Get your SQL Server database under version control now!Version control is standard for applications, but databases haven’t caught up. So how can you bring database development up to speed? Why should you start? Find out…

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  • Understanding Search Engine Optimization

    Search engine optimization plays a critical role in turning your website into a tool that truly grows your business. If you are new to the online world, this article will help you understand what SEO is and how to use it to reach more people with your message.

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  • Understanding the Mounting of a Filesystem

    - by Tom H.
    I'm new to linux and want to check my understanding of how mounting/filesystems work. I read related manpages, but just want to be sure. I have a partition say /dev/sda5 that is currently mounted to /home with various subdirs. It is my understanding that this means /dev/sda5 has its own portable filesystem that can be moved anywhere in the main filesystem. Questions: If I unmount /dev/sda5 from /home (# umount /home) and then mount it to /var/www/ (which is empty) (# mount -t ext3 /dev/sda5 /var/www) and replace the fstab entry, with /dev/sda5 /var/www ext3 defaults,noatime,nodev 1 2 and # mount -a, Q1) are all of the contents of /home now accessible under /var/www/ (i.e. /home/username -> /var/www/username)? Q2) Are all of the permissions from the /home filesystem kept intact in this new location? Anything else I should be concerned with? Just want to make sure I don't go wipe/corrupt anything. Coming from Windows the filesystem architecture takes getting used to (though I'm loving the flexibility!).

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  • Understanding: cloud-server, cloud-hosting, cloud-computing, the cloud

    - by Abel
    There's a lot of buzz about these subjects and there seems little consensus on the terms. Is that just me not understanding the subject, or is there a clear meaning for each of these terms? Are there more elaborate terms or descriptions that describe what a cloud provider has, is or offers? EDIT: rewritten question, apparently it was unclear, partially due to the bloat I added.

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  • How SMTP server works? need an understanding

    - by Rajeev
    Hi, I am looking for understanding on how SMTP server works in an environment? example, if I wish to run only SMTP server on windows 2008 for an explicit application, which is running on it's web serer, app. server and DB server. Do i need to register the domain so as to send emails from my domain, if i wish to send emails to some users from that SMTP server.

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  • Layman's book for understanding computer networks

    - by srid
    The good thing about books targeting a layman is that it is usually very engaging to read (not dry and boring like, say, school/university books). Charles Petzold's Code: The Hidden Language of Computer Hardware and Software does this for explaining the underlying hardware in computers. Is there a similar book for understanding computer networking?

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  • Understanding linear linked list

    - by ArtWorkAD
    Hi, I have some problems understanding the linear linked list data structure. This is how I define a list element: class Node{ Object data; Node link; public Node(Object pData, Node pLink){ this.data = pData; this.link = pLink; } } To keep it simple we say that a list are linked nodes so we do not need to define a class list (recursion principle). My problem is that I am really confused in understanding how nodes are connected, more precisely the sequence of the nodes when we connect them. Node n1 = new Node(new Integer(2), null); Node n2 = new Node(new Integer(1), n1); What is link? Is it the previous or the next element? Any other suggestions to help me understanding this data structure?

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  • Understanding Zabbix Triggers

    - by Mediocre Gopher
    I have zabbix set with an item to monitor a log file on a zabbix client: log["/var/log/program_name/client.log","ERROR:","UTF-8",100] And a trigger to determine when that log file get's more ERRORs: {Template_Linux:log["/var/log/program_name/client.log","ERROR:","UTF-8",100].change(0)}#0 This trigger gets tripped when the log file gets ERRORs the first time, but then that first trigger just sits around for ever in Monitoring-Triggers. My understanding is that the next time the server checks the value of log["/var/log/program_name/client.log","ERROR:","UTF-8",100] and sees that it hasn't changed that the trigger would go away. Obviously this isn't the case. Could someone explain why this first trigger isn't going away? Ultimately my goal is to receive an email whenever ERRORs are added to that log file, but I would like to understand how triggers are working first.

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  • Understanding RewriteCond in .htacces files

    - by Paulo Bu
    I'm having problems understanding how RewriteCond directive works. So far, it's pretty clear that it compares to strings to apply a RewriteRule. I have this file: <IfModule rewrite_module> RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ app_dev.php </IfModule> This works for me but I don't know why it works. So far in the RewriteCond directive I understand: if the value of REQUEST_FILENAME is NOT a file in the hard drive then allow the rule This doesn't have sense becouse app_dev.php after substituting is a file in the hard drive. Anyways, could someone enlighten me with this issue? I am having a very harsh time figuring out how this works.

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  • Understanding IUSR_<machine> account

    - by liho1eye
    Namely how is setting read/write permission for this account different from giving read/write access in the IIS (Windows 2003, so it should be IIS6 if I am not mistaken). Here is the issue: It looks like we had a security sweep and as a part of that IUSR account lost write access everywhere. A whole bunch of legacy ASP sites didn't like that at all... My very surfacish understanding is that it is enough to deny write access in the IIS console to protect a website from someone just dropping random files into it, and IUSR access only has effect on the application scripts running server side, and thus can be safely given write access back. edit: The applications in question obviously require write access to their own web folders, otherwise this wouldn't be an issue at all. Question is how to configure IIS/application to both satisfy security and make them work. My first instinct was to change account which is used to run the app pool. However that is already set to NETWORK_SERVICE, and that guy already has full access to folders in question.

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  • Junit and EasyMock understanding clarifications

    - by harigm
    Still Now I am using JUnit, I came across EasyMock, I am understanding both are for the same purpose. Is my understanding correct? What are the advantages does EasyMock has over the Junit? Which one is easier to configure? Does EasyMock has any limitations? Please help me to learn

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  • Understanding Git's version control

    - by georgeliquor
    Is there a way to go through different commits on a file. Say I modified a file 5 times and I want to go back to change 2, after I already committed and pushed to a repository. In my understanding the only way is to keep many branches, have I got that right? If I'm right I'm gonna have hundreds of branches in a few days, so I'm probably not understanding it really. Could anyone clear that up please?

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  • Understanding Authorized Access to your Google Account

    - by firebush
    I'm having trouble understanding what I'm am granting to sites when they have "Authorized Access to my Google Account." This is how I see what has authorized access: Log into gmail. Click on the link that is my name in the upper-right corner, and from the drop-down select Account. From the list of links to the left, select Security. Click on Edit next to Authorized applications and sites. Authenticate again. At the top of the page, I see a set of sites that have authorized access to my account in various ways. I'm having trouble finding out information about what is being told to me here. There's no "help" link anywhere on the page and my Google searches are coming up unproductive. From the looks of what I see there, Google has access to my Google calendar. I feel comfortable about that, I think. But other sites have authorization to "Sign in using your Google account". My question is, what exactly does that authorization mean? What do the sites that have authorization to "Sign in using my Google account" have the power to do? I hope that this simply means that they authorize using the same criterion that gmail does. I assume that this doesn't grant them the ability to access my email. Can someone please calm my paranoia by describing (or simply pointing me to a site that describes) what these terms mean exactly? Also, if you have any thoughts about the safety of this feature, please share. Thanks!

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  • Trouble understanding the whole OSGi web eco system

    - by Jens
    Hello, I am pretty new to the whole Java and OSGi world and I have trouble understanding the eco system of a OSGi web application. To be more precise I am at the moment trying to understand how all the parts of the eco system are related to each other: OSGi Framework (e.g. Apache Felix, Equinox, Knoplerfish) OSGi Runtime (e.g. Spring DM Server, Pax Runner, Apache Karaf) Web Extender (e.g. Pax Web Extender, Spring Web Extender) Web Container (e.g. Apache Tomcat, Jetty) To give you a visual representation of my actual understanding of their relationship check out this image: As far as I know the OSGi Framework is a implementation of the OSGi specification. The runtime is a distribution which adds additional functionality on top of the OSGi specification like logging for instance. Since there seem to be some differences in the classpath mechanism of OSGi and web containers like Tomcat you need some kind of translator. This part is handled by the "Web Extender". Would you please clarify this whole thing for me? Am I understanding everything correct?

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  • Understanding F# Asynchronous Programming

    - by Yin Zhu
    I kind of know the syntax of asynchronous programming in F#. E.g. let downloadUrl(url:string) = async { let req = HttpWebRequest.Create(url) // Run operation asynchronously let! resp = req.AsyncGetResponse() let stream = resp.GetResponseStream() // Dispose 'StreamReader' when completed use reader = new StreamReader(stream) // Run asynchronously and then return the result return! reader.AsyncReadToEnd() } In F# expert book (and many other sources), they say like let! var = expr simply means "perform the asynchronous operation expr and bind the result to var when the operation completes. Then continue by executing the rest of the computation body" I also know that a new thread is created when performing async operation. My original understanding was that there are two parallel threads after the async operation, one doing I/O and one continuing to execute the async body at the same time. But in this example, I am confused at let! resp = req.AsyncGetResponse() let stream = resp.GetResponseStream() What happens if resp has not started yet and the thread in the async body wants to GetResponseStream? Is this a possible error? So maybe my original understanding was wrong. The quoted sentences in the F# expert book actually means that "creating a new thread, hang the current thread up, when the new thread finishes, wake up the body thread and continue", but in this case I don't see we could save any time. In the original understanding, the time is saved when there are several independent IO operations in one async block so that they could be done at the same time without intervention with each other. But here, if I don't get the response, I cannot create the stream; only I have stream, I can start reading the stream. Where's the time gained?

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  • Understanding vhosts settings

    - by Matt
    Ok so i have a server and I want to put a few applications on and i am having vhost configuration problems. Here is what i have and I want some direction on what i am doing wrong...ok so the first file is /etc/apache2/ports.conf NameVirtualHost 184.106.111.142:80 Listen 80 <IfModule mod_ssl.c> Listen 443 </IfModule> <IfModule mod_gnutls.c> Listen 443 </IfModule> then i have /etc/apache2/sites-available/somesite.com <VirtualHost 184.106.111.142:80> ServerAdmin [email protected] ServerName somesite.com ServerAlias www.somesite.com DocumentRoot /srv/www/somesite.com/ ErrorLog /srv/www/somesite.com/logs/error.log CustomLog /srv/www/somesite.com/logs/access.log combined <Directory "/srv/www/somesite.com/"> AllowOverride all Options -MultiViews </Directory> </VirtualHost> when i visit somesite.com everything works great but when i add another vhost and lets say thats named anothersite.com. So i have /etc/apache2/sites-available/anothersite.com <VirtualHost 184.106.111.142:80> ServerAdmin [email protected] ServerName anothersite.com ServerAlias www.anothersite.com DocumentRoot /srv/www/anothersite.com/ ErrorLog /srv/www/anothersite.com/logs/error.log CustomLog /srv/www/anothersite.com/logs/access.log combined <Directory "/srv/www/anothersite.com/"> AllowOverride all Options -MultiViews </Directory> </VirtualHost> then i run the following commands >> sudo a2ensite anothersite.com Enabling site anothersite.com. Run '/etc/init.d/apache2 reload' to activate new configuration! >> /etc/init.d/apache2 reload * Reloading web server config apache2 ...done. but when i visit anothersite.com or somesite.com they are both down..What is going on with the vhosts. Could it be the NameVirtualHost declaration with the ip or something...maybe my understanding of vhost settings is not clear. What i dont understand is why do both site now all the sudden not work at all.I would highly appreciate the clarity By the way anothersite.com or somesite.com are the only things I changed to make it more readable

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  • better understanding of JSF Life cycle

    - by gurupriyan.e
    I need your help to understand this better. This is my case. I have a custom validator for each of my input controls in the form. So when there is any validation error,I add a corresponding FacesMessage in the validate method. My understanding was that when there is any validation error - or when there are any FacesMessages added in the validate method of the Custom Validator, it would skip the INVOKE APPLICATION phase and would directly call the RENDER RESPONSE PHASE - showing the FacesMessage that was added in the PROCESS VALIDATION Phase - Is this correct? The problem I'm facing is - I add a FacesMessage in the PROCESS VALIDATION Phase - because of a validation error - and I add a confirmation message for the action that was taken by the user in the INVOKE APPLICATION PHASE - Now both are shown in the page in the RENDER RESPONSE Phase ? - If my understanding is correct in the above question - is it the best practice to conditionally add a confirmation FacesMessage after confirming that there are no FacesMessages in the currect FacesContext ? Appreciate your help.

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  • What is the Difference Between Learning HTML and Learning a Programming Language?

    - by Brad Johansen
    I learned HTML and CSS about 8 months ago, and recently, about 2 months ago I started learning Python and Ruby. I find it much harder/time consuming to understand and be able to put Python and Ruby into practice than it was HTML or CSS. How is learning/understanding HTML and CSS, and being able to use them different from learning a programming language like Python or Ruby, and being able to put them in practice.

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  • Which type of design pattern should be used to create an emulator?

    - by Facon
    I have programmed an emulator, but I have some doubts about how to organizate it properly, because, I see that it has some problems about classes connection (CPU <- Machine Board). For example: I/O ports, interruptions, communication between two or more CPU, etc. I need for the emulator to has the best performance and good understanding of the code. PD: Sorry for my bad English. EDITED: Asking for multiple patterns.

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  • Which design pattern should be used to create an emulator?

    - by Facon
    I have programmed an emulator, but I have some doubts about how to organizate it properly, because, I see that it has some problems about classes connection (CPU <- Machine Board). For example: I/O ports, interruptions, communication between two or more CPU, etc. I need for the emulator to has the best performance and good understanding of the code. PD: Sorry for my bad English. EDITED - Asking for multiple patterns.

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