Fundamental of Database Systems
1401312-3
By
Dr Abdullah Alzahrani ينارهزلا هللادبع .د
Assessment عيزوت تاجردلا
• 20% Mid-Term written exam
• 10% Mid-Term practical exam
• 20% Project
• 50% Final Exam
•
20%
يرظن يفصن رابتخا
•
10%
يلمع يفصن رابتخا
•
20%
عورشم
•
50%
يئاهن رابتخا
Reference باتكلا عجرملا
• Fundamentals of Database Systems, 5th ed., by Elmasri and Navathe, Pearson International Edition, 2007.
• http://dev.mysql.com/doc/
Introduction همدقم
• What is Database (DB)?
• Motivations of using Databases
• Database Models
• What are Database Management Systems (DBMS)?
• What DBMS will we use?
•
Introduction همدقم
• What is a Database (DB)?
• A database is a collection of related data. By data, we mean known facts that can be recorded and that have implicit meaning.
• Properties:
• A database represents some aspect of the real world
• A database is a logically coherent collection of data with some inherent meaning
• A database is designed, built, and populated with data
for a specific purpose.
Introduction همدقم
• What is the main component of a Database (DB)?
• A table (Relation) – one or many
• is a data structure for representing related Entities.
• consists of columns (represent Attributes) and rows (represent Entities or tuples).
• A column represents a same property of a same data type for all entities.
• A row represents a set of properties of different data types for a specific entity
rowcolu mn
Introduction همدقم
• Motivations of using Databases. Why ?
• Redundancy
• storing the same data multiple times
• Modification anomalies (updating – deleting - adding)
• Problems with searching
Introduction همدقم
Introduction همدقم
Introduction همدقم
• Data Models
1. Relational Model
• Describes a structure of database. It is a set of relations definitions (relations schema)
• Relational table is a set of tuples
• Supported Relational Algebra
2. Object-Oriented Model
• It is a logical model that is represented as a set of class definitions in OO language.
3. Entity-Relationship Model
• High-level model which describes data as entities, attributes, and relationships
• Others …..
Introduction همدقم
• Data Models
• Relational Model
Introduction همدقم
• Data Models
• Object-Oriented
Model
Introduction همدقم
Introduction همدقم
• Data Models
• Entity-Relationship
Model
Introduction همدقم
• What are Database Management Systems (DBMS)?
• A database management system (DBMS)is a collection of programs that enables users to create and maintain a database.
• It facilitates the processes of:
1. Defining (specifying the data types, structures, and constraints of the data)
2. Constructing (storing the data on a storage that is controlled by the DBMS)
3. Manipulating (querying, updating, generating reports)
4. and sharing databases among various users and applications.
• Other functions of DBMS is Protection and Maintenance.
Introduction همدقم
• DBMS
examples
• MySQL
• PostgreSQL
• Microsoft
Access
• SQL Server
• Oracle
Introduction همدقم
• DBMS consists of:
1. Physical database
• Collection of files that contain the data content.
2. Schema
• A specification of the information content of Physical database
3. Database engine
• software that supports access to and modification of the contents of the databases.
4. Data Definition and Manipulation languages
• Programming languages that support schema definition and database access
• Ex: SQL (Structured Query Language)
Introduction همدقم
• People who work with databases and DBMS :
1. Database designers
• Create databases according to the client requirements.
2. Applications developers
• Design and build applications which interact with databases to accomplish specific tasks.
3. End users
• Mainly users who interacts with databases via interfaces of applications designed by Applications developers
4. Database administrators
• Responsible for controlling access to databases, maintaining data accuracy and integrity, monitoring an improving
performance.
Introduction همدقم
• SQL (Structured Query Language)
• The standard language for interaction with relational DBMS
• Also, is the standard database language for DDL, DML, VDL, and SDL for relational DB
• DDL (Data Definition Language)
• A Language for specifying the conceptual schema of a DB
• Examples: Create, alter, and drop schema
• DML (Data Manipulation Language)
• A Language manipulating the contents of a DB
• Examples : DELETE, INSERT, SELECT, UPDATE
• VDL (View Definition Language)
• A Language that supports the definition of external views of a DB
• Examples :CREATE VIEW
• SDL (Storage Definition Language)
• A Language that supports the definition of internal schema of a DB
Introduction همدقم
• What DBMS will we use?
• http://dev.mysql.com/doc/
Introduction همدقم
• Some important terms
1. DB and DBMS
2. Table (Relation), column, and row
3. Redundancy and Modification anomalies
4. Data Models: Relational Model, Logical, Object- Oriented, and Entity-Relationship (ER)
5. SQL
6. DDL, DML, VDL, and SDL
7. Database designers, Applications developers, End
User, Database administrators
Introduction همدقم
End
Introduction همدقم
