MS SQL Server is a relational database management system (RDBMS) developed by Microsoft. This product is built for the basic function of storing retrieving data as required by other applications. It can be run either on the same computer or on another across a network. This tutorial explains some basic and advanced concepts of SQL Server such as how to create and restore data, create login and backup, assign permissions, etc. Each topic is explained using examples for easy understanding.

What is SQL Server?

  • It is a software, developed by Microsoft, which is implemented from the specification of RDBMS.

  • It is also an ORDBMS.

  • It is platform dependent.

  • It is both GUI and command based software.

  • It supports SQL (SEQUEL) language which is an IBM product, non-procedural, common database and case insensitive language.

Usage of SQL Server

  • To create databases.
  • To maintain databases.
  • To analyze the data through SQL Server Analysis Services (SSAS).
  • To generate reports through SQL Server Reporting Services (SSRS).
  • To carry out ETL operations through SQL Server Integration Services (SSIS).

SQL Server Components

SQL Server works in client-server architecture, hence it supports two types of components − (a) Workstation and (b) Server.

  • Workstation components are installed in every device/SQL Server operator’s machine. These are just interfaces to interact with Server components. Example: SSMS, SSCM, Profiler, BIDS, SQLEM etc.

  • Server components are installed in centralized server. These are services. Example: SQL Server, SQL Server Agent, SSIS, SSAS, SSRS, SQL browser, SQL Server full text search etc.

Instance of SQL Server

  • An instance is an installation of SQL Server.
  • An instance is an exact copy of the same software.
  • If we install 'n' times, then 'n' instances will be created.
  • There are two types of instances in SQL Server a) Default b) Named.
  • Only one default instance will be supported in one Server.
  • Multiple named instances will be supported in one Server.
  • Default instance will take the server name as Instance name.
  • Default instance service name is MSSQLSERVER.
  • 16 instances will be supported in 2000 version.
  • 50 instances will supported in 2005 and later versions.

Advantages of Instances

  • To install different versions in one machine.
  • To reduce cost.
  • To maintain production, development, and test environments separately.
  • To reduce temporary database problems.
  • To separate security privileges.
  • To maintain standby server.