Access-Intro_to_DB

Access-Intro_to_DB - Introduction to Databases Databases...

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Introduction to Databases Databases are used to store electronic information. In order to construct a database, you need to understand how data can and should be organized. In order to be able to use the data to obtain valuable information, you also have to understand how to find it in the database. Before we begin building and using our database, we will first discuss the benefits of using databases, components of database management systems, different ways to organize information, and types of databases. We refer to an electronic database as secondary storage. This means that the information is contained or housed in some sort of media such as magnetic disk (i.e. hard drive) or tape. Today’s fast access hard drives with large storage capacities make databases extremely useful for organizations to keep track of large amounts of data. Benefits of Databases Without a central database, an organization may need multiple files on the same subject or person. Duplicate information can cause a lack of data integrity where not all files contain the same information; in addition there would be a lot of wasted storage space. Think about a University student records system. When you applied to USA, your information was entered into a central database by the Admissions office. Those same records are accessible by the Registrar, the colleges and departments within the University, as well as other organizations. If, for example, you change your address, that information only needs to be changed in one central location and all organizations and departments can get access to the updated information. The many advantages of databases include: 1) Data Sharing – information in one department or organization can be readily shared with others. 2)
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Access-Intro_to_DB - Introduction to Databases Databases...

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