1. Database Management Systems

2. Course info Instructor: Yrd. Doç. Dr. Cengiz Örencik
Course material
ses
all the notes will be shared there

3. Book Not required You may use any database book
Database Management Systems – 3rd Edition
Ramakrishnan and Gehrke

4. Grading Midterm 40% Inclass quizzes (2) 5% + 5% Final 50% Hws
Self study
Not to be graded

5. Aim of the course Learning database system concepts
Learning how to design and implement a database application

6. Why do we need DBMSs?
Computers were originally developed for number crunching.
By time, data storage and processing became as important as scientific computing
Amount and types of data increased :
Image/audio/video data
Genome data
Customer transactions
Database Management Systems were developed to manage this data.

7. Why do we need people who know about databases?
Someone should design the database
Someone should maintain/tune the database
Someone should design queries to retrieve data from the database
Someone should deal with the recovery process when the system crashes

8. Intro Database Management System (DBMS) provides….
… efficient, reliable, convenient, and safe
multi-user storage of and access to massive
amounts of persistent data.

9. DBMS Massive – terrabytes/day Persistent
Safe – hard/software failure, power cut
Multi-user
Convenient
Efficient
Reliable

10. DBMS
A Database Management System (DBMS) is a software package designed to store and manage databases
We will not consider:
Database applications may be programmed via “frameworks”
Environments that help to develop program
Ruby on rails, Django…
DBMS may run in conjunction with “middleware”
Web servers that interact with database
Data-intensive applications may not use DBMS at all
Store everything on files

11. Why Use a DBMS? Data independence Efficient access
Application programs don’t need details of data representation and storage
Efficient access
A variety of techniques
Data integrity and security
Enforce constraints, access control…
Uniform data administration
How different groups of users use it
Organized to minimize redundancy
Reduced application development time
DBMS support most common important functions
Concurrent access, recovery from crashes
Multiple users use it without conflict
Protect from effects of system failures

12. What do DBMSs do? They are system programs like the operating system
Database Management Systems (DBMSs) enable us to
Create a database
Populate the database
Query the database
Let multiple users use the database at the same time
Recover the data when something goes wrong

13. What do DBMSs do?
Lets say you would like to create a database for the library:
You need to keep information about the books and who borrowed them
What do we need to know about a book?
Name
Author
Publisher
Year
For each book we need to keep that information
Book (Name, Author, Publisher, Year)

14. What do DBMSs do? Name Author Publisher Year …. …
CREATE TABLE book (name CHAR(20),
author CHAR(20),
publisher CHAR(20),
year INTEGER)
INSERT INTO book (‘Kyle’s Mom’, ‘Eric McCarthy’, ‘Chef’, 2001)
Name
Author
Publisher
Year
Kyle’s Mom
Eric McCarthy
Chef
2001
Death becomes him
Kenny Grave
Mr. Garrison
2000 …. …

15. What do DBMSs do? Name Author Publisher Year …. … SELECT name
FROM book
WHERE publisher = ‘Chef’
Name
Author
Publisher
Year
Kyle’s Mom
Eric McCarthy
Chef
2001
Death becomes him
Kenny Grave
Mr. Garrison
2000 …. …

16. What do DBMSs do?
DBMS
User
Database

17. Syllabus Introduction to Database Systems Entity Relationship Model
Relational Model
SQL Queries, Triggers, and Stored Procedures
Schema Refinement and Normal Forms
Data Storage and Indexing
Transaction Management
Concurrency Control
Crash Recovery

18. Queries What is the name of the student with sid 53680?
How many students are enrolled to DBMS course?
How many instructors are there in the Computer Engineering Department?
What fraction of students of DBMS course get a grade better than BB?

19. Summary DBMS used to maintain, query large datasets
Benefits include recovery from system crashes, concurrent access, quick application development, data integrity and security
DBAs hold responsible jobs
and are well paid
Whether you know it or not, you’re using a database every hour