DBMS - Introduction, DBMS Applications, Database system architecture, dbms components, database users,

1. INT306
Database Management Systems
INTRODUCTION
Text book
Database System Concepts
A. Silberschatz, H. F. Korth, S. Sudarshan
Course Instructor
Mr. Sumit Mittu
Assistant Professor and Placement Coordinator, CSE/IT
Lovely Professional University, Punjab (India)
sumit.12735@lpu.co.in sumit.mittu@gmail.com
http://tinyurl.com/askSumit
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2. IN THIS CHAPTER
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database management system
database system applications
purpose of database systems
database system architecture
database users and administrators
database system components
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3. DATABASE MANAGEMENT SYSTEMS
• Database defined:
• Collection of the data that contains information relevant to
an enterprise
• DBMS defined:
• A collection of interrelated data and a set of programs to
access those data
• DBMS goal:
• To provide a way to store and retrieve database
information that is both convenient and efficient
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4. DATABASE MANAGEMENT SYSTEMS
• Examples of DBMS
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Oracle
MS SQL Server
MySQL
IBM DB2
Sybase
Foxpro/Foxbase
• The following are NOT the DBMS
• SQL, PL/SQL, T-SQL
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5. SCRATCH YOUR MIND!!!
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Sumit Mittu, Assistant Professor, CSE/IT
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6. DATABASE SYSTEM APPLICATIONS
• Enterprise Applications of databases
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Banking
Airlines
Universities
Credit card transactions
Telecommunication
Finance & Accounting
Sales & Marketing
Manufacturing
Human Resource
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7. PURPOSE OF DATABASE SYSTEMS
• To overcome disadvantages of File-processing
systems:
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Data redundancy
Data inconsistency
Difficulty in accessing data
Data isolation
Integrity problems
Atomicity problems
Concurrent-access problems
Security problems
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8. SCRATCH YOUR MIND!!!
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Sumit Mittu, Assistant Professor, CSE/IT
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9. SCRATCH YOUR MIND!!!
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Sumit Mittu, Assistant Professor, CSE/IT
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10. DATABASE ARCHITECTURE
• 3-level architecture of database
• based on data abstraction
• View of Data
• Physical level
• Logical/Conceptual level
• View/User level
• Example of a customer record
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11. DATABASE ARCHITECTURE
• Instance
• Defined as the collection of information stored in the
database at a particular moment
• Schema
• Defined as overall design/structure of the database
• Types:
• Physical schema
• Logical/Conceptual schema
• View schema / User schema / Subschema
• Physical Data independence
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12. SCRATCH YOUR MIND!!!
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Sumit Mittu, Assistant Professor, CSE/IT
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13. DATABASE USERS AND ADMINS
• Types of database users
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Naïve users
Specialized users
Sophisticated users
Application programmer
• Database Administrators (DBA)
• Schema, storage structure and access-methods definition
• Authorization control
• Routine maintenance
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14. DATABASE USERS AND ADMINS
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15. SCRATCH YOUR MIND!!!
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16. COMPONENTS OF DBMS
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Query Processor
Storage Manager
Data Storage
Transaction manager
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18. DATABASE ARCHITECTURE
• Influenced by the underlying computer system on
which the database is running:
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Centralized Database
Client-server Database
Parallel (multi-processor) Database
Distributed Database
• Based on Client-server model, database can have:
• Two-tier architecture
• Three-tier architecture
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19. DATABASE ARCHITECTURE
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