1. NOTE: To change the image on this slide, select the picture and delete it. Then click the Pictures icon in the placeholder to insert your own image. DATABASE MANAGEMENT SYSTEM (DBMS) IS A SOFTWARE THAT ALLOWS YOU TO CREATE AND MANAGE DATABASE

2. DATABASE MANAGEMENT SYSTEM  DATA DICTIONARY- contains data about each file in the database and each field within those files Each file stores details, file name, description, relationship to other files Each field stores field name, description, field type, field size, default calue, validation rules and its relationship to other field

3. DATABASE MANAGEMENT SYSTEM  FILE RETRIEVAL AND MAINTENANCE- Provides tool to retrieve data, you query it to retrieve. Query is a request for specific data. Users can instruct DBMS to display or print the the result of query. Common methods in used are query language, query by example, forms and report generator.

4. DATABASE MANAGAMENT SYSTEM QUERY LANGUAGE- consist of simple English- like statements that allows users to specify the data to display, print or store. DTMS provides many wizard to guide users (example: Simple query Wizard in Microsoft Access) 3 easy steps for query wizard  Select field to be displayed  Assign a name, to open it later  View query results in screen

5. COMMON METHODS FOR RETRIEVAL Has graphical user interface to assist user in retrieving data QUERY BY EXAMPL E Windows on the screen that provides entering or modifying data FORMS Allows users to design a report on screen. Usually allows you to format no.’s and dates Report generator

6. DATABASE MANAGEMENT DATA SECURITY- Ensures that only the authorized users are to access data. Some uses previleges, this defines the action of the user that can only be performed. BACKUP AND SECURITY- occasionally Database are damaged due to human errors, hardware failure, etc. DBMS provides a system utility to recover the lost file. It has backup or copy of data. Recovery utility uses log to recover database. Continous backup, data is backed up whenever a change is made

7. RELATIONAL, OBJECT-ORIENTED, MULTI DIMENTIONAL DATABASES Data models- consist of rules and standards on how the database is to be organized

8.  Stores data in tables, rows and columns  A developer of database refers file as a relation, a record as a tuple and field as an attribute  A user of database refers file as a table, record as a row and field as a column.  SQL- is a popular query language that allows users to managa, update and retireve data. It has special keywords. RELATIONAL DATABASE

9. OBJECT-ORIENTED DATABASE(OODB)  Stores data in objects. Object is an item that contains data, actions that read. This has several advantages because they can score more types of data includes photos, video clips and audio clips and documents. If objects are queried, it displays faster than the other model.  Object query language- to manipulate and retrieve data. OOL is similar to SQL, they use same grammar, rules and keywords

10. MULTI DIMENTIONAL DATABASES  Store data in dimension, relationship data is in 2d.  This can analyse data in any view  This is applicable if some business will inquire infos about product sales of a department.  This can do its task at a high speed  NO QUERY LANGUAGE FOR THIS MODE

11. DATA WAREHOUSES  Uses multi-dimensional database  Is a huge storage of data, manages data required to analyse historical and current transactions  Users can access transactions quickly and efficienty Data mart- mini version of warehouse- it helps specific group of people, marketing and sales department