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Database Management by Mind Map: Database Management
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Database Management

Database Management Systems

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

New node

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

Query language

Query by example

Form

Report generator

A query language consists of simple, English-like statements that allow users to specify the data to display, print, or store

Query by example (QBE) provides a GUI to assist users with retrieving data

A form is a window on the screen that provides areas for entering or modifying data in a database

A report generator allows users to design a report on the screen, retrieve data into the report design, and than display or print the report

A DMBS Provides a variety of techniques to restore the database to a usable form in case it is damage or destroyed

backup

log

Recovery

Continuous backup

Objectives Overview

Define the term,database,and explain how a database interacts with data and information

Define the term,data integrity, and describe the qualities of valuable information

Discuss the terms character, field ,record and file

Describe file maintenance techniques and validation techniques

Differentiate between a file processing approach and the database approach

Discuss the functions common to most database management systems

Describe characteristics of relational, object oriented, and multidimensional databases

Explain how to access Web databases

Identify database design guidelines and discuss the responsibilities of database analysts and administrators

Databases, Data, and Information

Database

Collection of data organized in a manner that allows access, retrieval, and use of that data

Data

Collection of unprocessed items, text, Numbers, Images, Audio, Video

Information

processed data, Documents, Audio, Images Video

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

Create a computerized database

Add, modify, and delete data

Sort and retrieve data

Create forms and reports from the data

Data integrity identifies the quality of the datav

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

A character is one byte

Number, letters, space, punctuation marks, or other symbols

A field is a combination of one or more related characters

Field name

Field size

Data type

Common data types include

Text

Numeric

Auto Number

Currency

Date

Memo

Yes/No

Hyperlink

Object

Attachment

A record is group of related fields A primary key uniquely identifies each record

A data file is a collection of related records

Maintaining Data

File maintenance refers to the procedures that keep data current

Adding records

Modifying records

Deleting records

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

Validation compares data with a set of rules or values to find out if the data is correct

Alphabetic/Numeric Check

Range check

Consistency check

Completeness check

check digit

Other checks

Users modify to correct inaccurate data or update old data

When a record no longer is needed, a user deletes it from a file

File Processing Versus Databases

File processing system

Each department has its own set of files

Used for many years

Have data redundancy

Isolate data

Database approach

Programs and users share data

Reduce data redundancy

Improve

New node data integrity

Share data

Allows easier access

Reduces development time

Can be more vulnerable

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

A relationship is a link within the data

Structured Query Language (SQL) is a query language that allows to manage, update, and retrieve data

An object-oriented database (OODB) stores data in objects

Examples of applications applications appropriate for an object-oriented database include

Multimedia database

Groupware database

Computer aided design database

Hypertext database

A multidimensional database can store data in more than two dimensions of data

A data warehouse is a huge database that stores and manages the data required to analyze historical and current transactions

Web Databases

Databases on the Web allow you to

Shop for products or services

Buy or sell stocks

Search for a job

Make airline reservations

Register for college classes

Check semester grades

Database Administration

It is important to have a carefully designed database

Database analysts and administrators are responsible for managing and coordinating all database activities

Database Analyst(DA)

Database Administrator(DBA)

Employees should learn how to use the data in the database effectively

Interact with database

Identify new data for the database

Maintain the database

Summary

How data and information are valuable assets to an organization

Methods for maintaining high quality data

Advantages of organizing data in a database

Various types of databases

Roles of the database analysts and administrators

Assessing the quality of valuable information