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Database Management by Mind Map: Database Management
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Database Management

Databases, Data, and Information

Database software, often called a database management system (DBMS), allows users

Garbage in, garbage out (GIGO) points out the accuracy of a computer’s output depends on the accuracy of the input

Valuable information should have the following characteristics

The Hierarchy of Data

Data is organized in layers

Common data types include

A record is a group of related fields

Maintaining Data

File maintenance refers to the procedures that keep data current

Users add new records to a file when they obtain new data

Users modify a record to correct inaccurate data or update old data

File Processing Versus Databases

Database Management Systems

A data dictionary contains data about each file in the database and each field in those files

A DBMS provides several tools that allow users and programs to retrieve and maintain data in the database

Relational, Object‐Oriented, and Multidimensional Databases

A data model consists of rules and standards that define how the database organizes data

A relational database stores data in tables that consist of rows and columns – Each row has a primary key – Each column has a unique name