Introduction to Database
Systems
Good decisions require good information that is derived
from raw facts – data
Data are likely to be managed most efficiently when
they are stored in a database
In this lecture, you’ll learn what a database is, what it
does, and why it yields better results than other data
management methods.
You’ll also learn about various types of databases and
why database design is so important.
, Some history
Databases evolved from computer file systems
Although file system data management is now largely
outmoded,
– understanding characteristics of file system is
important because file systems are the source of
serious data management limitations
, Why database?
Businesses need to keep data and information about their
clients and make it available for decision at the opportune time
It can be argued that the ultimate purpose of all business
information systems is to help businesses use information as
an organizational resource.
At the heart of all these systems are the;-
– Collection
– Storage
– Aggregation
– Manipulation
– Dissemination
– and management of data
, Why database?
How can these businesses process this much data?
How can they store it all, and then quickly retrieve just
the facts that decision makers want to know, just when
they want to know it?
The answer is that they use databases.
Systems
Good decisions require good information that is derived
from raw facts – data
Data are likely to be managed most efficiently when
they are stored in a database
In this lecture, you’ll learn what a database is, what it
does, and why it yields better results than other data
management methods.
You’ll also learn about various types of databases and
why database design is so important.
, Some history
Databases evolved from computer file systems
Although file system data management is now largely
outmoded,
– understanding characteristics of file system is
important because file systems are the source of
serious data management limitations
, Why database?
Businesses need to keep data and information about their
clients and make it available for decision at the opportune time
It can be argued that the ultimate purpose of all business
information systems is to help businesses use information as
an organizational resource.
At the heart of all these systems are the;-
– Collection
– Storage
– Aggregation
– Manipulation
– Dissemination
– and management of data
, Why database?
How can these businesses process this much data?
How can they store it all, and then quickly retrieve just
the facts that decision makers want to know, just when
they want to know it?
The answer is that they use databases.
