Feature Comparison of Different Visualization tool

  • Some of the good things in Qlikview are
    • Extension objects for third party visualization. http://www.qlikblog.at/2848/qlikview-extension-tutorial-basic-concept
    • Column level data reduction based on users login (in QlikView we have Section Access)
    • Does not support connectivity with XML data sources.
    • Bookmarks.
    • QlikView can manage much more complex calculations. You soon hit the limit for what Tableau can do.
    • QlikView has their own data file for storage (QVD), which compresses data as 10 times of the original size. There is no equivalent to QVD in Tableau
    • Because Tableau doesn’t have a QVD equivalent, you’re limited by the DBMS in terms of response times.

Continue reading

Basic Concept of Cloud-Service

Cloud-Service is all about Hardware or software provided to you as a service and accessible through the internet.

There are basically 3 types of cloud service

Infrastructure as a Service (IaaS)

Organization outsources the equipment used to support operations, storage, hardware, servers and networking components. The service provider owns the equipment and is responsible for housing, running and maintaining it. The client typically pays on a per-use basis.

Some popular Vendors of Infrastructure as a Service (IaaS) :Amazon, AT & T, HP,Rackspace Continue reading

How Network Address Translation Works

In this blog i will discuss Network Address Translation how it work and why we needed.

In IPv4 we have approximately 4 billions IP address but we also have 7 billions people leaving in the planet and also each of 7 billion people may want to use multiple devices to access the  internet.So we have problem in our hand.

There are two way to overcome to this problem either Implement Network Address Translation or Implement IP6. Continue reading

What Is the Difference Between Public and Private IP Addresses?

Internet Protocol address are basically two types public ip and private ip.In the layman point of view “A public IP address is assigned to every computer that connects to the internet, while private IP address are used to distinguish between computers on the same local area network(LAN).”

Public IP:

User has no control over the IP address (public) that is assigned to the computer. The public IP address is assigned to the computer by the Internet Service Provider as soon as the computer is connected to the Internet gateway.

A public IP address can be either static or dynamic. A static public IP address does not change and is used primarily for hosting web pages or services on the Internet. On the other hand, a dynamic public IP address is chosen from a pool of available addresses and changes each time one connects to the Internet. Continue reading

What is the difference between JVM, JDK, JRE?

What we download i.e JRE(Java Runtime Environment),JDK(Java Development Kit) as installer.

JDK contains tools needed to develop and compiling the Java programs like javac,jar,debugging tools,javap etc.

JRE to run the programs.It contains libraries,java,javaw and rt.jar.

JVM is created when we run a java program.JVM is the one who provides Platform independence to Java by converting byte code to machine specific code.

jvm_jre_jdk

Validate a date in “YYYY-MM-DD” format

function checkDateFormat($date)
{
    //match the format of the date
    if (preg_match ("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/", $date, $parts))
    {
        //check weather the date is valid of not
        if(checkdate($parts[2],$parts[3],$parts[1]))
            return true;
        else
        return false;
    }
    else
        return false;
}