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Principles of Database Design, P. I. MBAA 609 R. Nakatsu. Support Strategies for Competitive Advantage. Support Business Decision Making. Support Business Processes and Operations. Major Roles of Information Systems. File-Processing Systems. Problems with File-Processing Systems.

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Principles of database design p i
Principles ofDatabase Design,P. I

MBAA 609

R. Nakatsu


Major roles of information systems

Support

Strategies for

Competitive Advantage

Support

Business Decision Making

Support

Business Processes and Operations

Major Roles of Information Systems



Problems with file processing systems
Problems with File-Processing Systems

  • Data are separated and isolated

  • Data are often duplicated

  • Incompatible data files

  • Program-Data Dependence



The relational model
The Relational Model

  • Data is represented in two-dimensional tables

    • Each of the tables is a matrix consisting of a series of row/column intersections

    • Files are called tables or relations

    • Fields (i.e. columns) of the tables are called attributes

    • Records (i.e. rows) of the tables are called tuples (rarely used terminology)

  • Information in more than one table can be easily extracted and combined


What is a database
What is a database?

  • A database is an integrated collection of logically related data elements. A database consolidates records previously stored in separate files.

  • A database can be viewed as the topmost element of a data hierarchy:

    • database (a set of related files)

    • file (a collection of related records)

    • record (a group of logically related fields)

    • field (an attribute)

    • character (single alphabet, number, or other symbol)


Database management system dbms
Database Management System (DBMS)

A DBMS (database management system) is a set of computer programs that is used to create, maintain, and provide controlled access to user databases

What are some of the DBMS products on the marketplace today?


Dbms main functions
DBMS: Main Functions

  • Data definition

    • Define what data is stored, the type of data, how the data is related.

    • Specify how the data can be formatted and validated

  • Data manipulation

    • You can select which data you want, filter it, sort it, join it with other data, summarize it (querying data)

  • Data control

    • Allows you to specify security, as well as how the data can be shared.

    • Backup and recovery tools

  • Application Development

    • Graphical tools to develop menus, forms, and reports


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