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Database Models by Mind Map: Database Models
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Database Models

Flat File

Simplest model for storing data. Consists of a single, two-dimensional table of data elements.

Most databases display records as rows in a table or as forms., A record refers to a collection of data fields., A record has a template referred to as a record type and contains field names, but no data. Also, a data contained record is called a record occurance.

The smallest unit of meaningful information is called a field., A field name is designed to describe the field's contents., There are two types of length fields known as variable-length fields and fixed-length fields., Variable-length field expands to fit the data you enter, up to a max number of characters, Fixed-length fields contain a predetermined number of characters.

Relationship Databases

Hierarchial Database

Allows one-to-one and many-to-many relationships, A one-to-one relationship means one record is related to many records, For example, in the case of a CD store, a customer can order many albums. Also, an album has only one description., A many-to-many relationship means that one record in a specific record type can be related to many records in another record type., For example, one album contains many songs, and a song can be included in a number of different albums, Rarely used in today's businesses, but are still used for specific applications.

Network Database

Combines both one-to-one and many-to-many

Relational Database

Stores data in a collection of related tables.

Each table has a sequence of records, similar to that of a flat file., Two tables can be joined by similar fields., Tables are essentially independent, but can be joined to complete a particular task.

Dimensional Database

Also referred to as a multidimensional database, organizes relationships over three or more dimensions.

Each field is contained within a cell that can be accessed from a query or from following a relationship., Offers a simple way to visualize data and formulate queries.

Object Database

Also referred to as an object-oriented database, stored data as objects, which can be grouped into classes and defined by attributes and methods.

Can easily store data about different types of orders., For example, a class called orders holds data and methods common to all types of orders. A class called web orders is common to only orders placed on the web.

Object-relational Database

Used to describe a variety of technologies that combine object-oriented and related concepts. Described as an attempt to add OO-ness to tables.

Have the flexibility to store unique types of data and program code necessary to access that data., For example, a relational database sends a file name to an external player, but an object-relational database can store the song data and the routine to play it. Like iTunes.