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Database Sharding The Rise of Database Sharding The concept of Database Sharding has been gaining popularity over the past several years, due to the enormous growth in transaction volume and size of business application databases. This is particularly true for many successful online service providers, Software as a Service (SaaS) companies, and social networking Web sites. Database Sharding can be simply defined as a "shared-nothing" partitioning scheme for large databases across a number of servers, enabling new levels of database performance and scalability achievable. If you think of broken glass, you can get the concept of sharding - breaking your database down into smaller chunks called “shards” and spreading those across a number of distributed servers. The term "sharding" was coined by Google engineers, and popularized through their publication of the Big Table architecture. However, the concept of "shared-nothing" database partitioning ha...

Create Virtual Harddisk Using DISKPART Open the   Elevated Command Prompt   with Administrator Privileges and type the following commands: DISKPART CREATE VDISK FILE="c:\win7\win7.vhd" MAXIMUM=20000 SELECT VDISK FILE="c:\win7\win7.vhd" ATTACH VDISK CREATE PARTITION PRIMARY ASSIGN LETTER=X FORMAT QUICK LABEL=Windows7 EXIT This will create the  VHD  file of primary partition. You will see the newly attached disk in Disk Management with Drive Letter X: Attaching and Detaching VHD in  Windows 7 Right Click  on My Computer and Click ' Manage ' that will open up  Computer Management , in that click on  Disk Management . Just like previous part. Then Right Click on Disk Management and select  'Attach VHD'.  This will open new windows  'Attach Virtual Hard Disk ' Click on  OK  and that will attach the existing Virtual Hard Disk. Now, if you don't want to make write anythin...

Factory Method Intent Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses. Also Known As Virtual Constructor Motivation Frameworks use abstract classes to define and maintain relationships between objects. A framework is often responsible for creating these objects as well. Consider a framework for applications that can present multiple documents to the user. Two key abstractions in this framework are the classes Application and Document. Both classes are abstract, and clients have to subclass them to realize their application-specific implementations. To create a drawing application, for example, we define the classes DrawingApplication and DrawingDocument. The Application class is responsible for managing Documents and will create them as required—when the user selects Open or New from a menu, for example. Because the particular Document subclass to insta...