TAILIEUCHUNG - Managing Databases and Tables

As a database developer, you are responsible for creating and managing databases and tables. While creating tables, it is important for you to maintain data integrity. This implies that the data in the tables is accurate, consistent, and reliable. SQL Server provides various checks that you can apply on tables to enforce data integrity. The SQL Server contains various system databases. This chapter introduces the different types of system databases. | Managing Databases and Tables As a database developer you are responsible for creating and managing databases and tables. While creating tables it is important for you to maintain data integrity. This implies that the data in the tables is accurate consistent and reliable. SQL Server provides various checks that you can apply on tables to enforce data integrity. The SQL Server contains various system databases. This chapter introduces the different types of system databases. It also explains how to create and drop user-defined databases. Further it also explains how to create and manage user-defined tables by using DDL statements. In addition the chapter focuses on various checks and rules that you can apply to tables to ensure data integrity. Objectives In this chapter you will learn to fl Manage databases fl Manage tables Chapter 4 Managing Databases As a database developer you might need to create databases to store information. At times you might also delete a database if it is not required. Therefore it is essential to know how to create and delete a database. The SQL Server contains some standard system databases. Before creating a database it is important to identify the system databases supported by SQL Server 2005 and their importance. Identifying the System Databases in SQL Server 2005 System databases are the standard databases that exist in every instance of SQL Server 2005. These databases contain a specific set of tables that are used to store server-specific configurations templates for other databases. In addition these databases contain a temporary storage area required to query the database. SQL Server 2005 contains the following system databases master tempdb model msdb Resource The master Database The master database records all the server-specific configuration information including authorized users databases system configuration settings and remote servers. In addition it records the instance-wide metadata such as logon accounts endpoints and

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