Download The Database Environment

THE DATABASE ENVIRONMENT
Where is the wisdom we have lost in
knowledge? Where is the knowledge we have
lost in information.
~ T.S. Eliot ~
Learning Objectives
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Concretize the concepts of data, information, data management
and metadata
Explain what a database is and why databases are important
Describe a database management system
Differentiate between the DBMS and a database
Describe the different data models and abstraction layers
Explain the similarities and differences among DBMS products
Explain DBMS history and modern uses
Describe how data is physically stored in primary and secondary
storage
Before we begin…What’s…
Data?
Information?
Data
Management?
Metadata?
Query?
Data or Information?
Where’s the
Data?
Where’s the
Metadata?
Where
is the:
Data?
MetaData?
Activity: Data or Meta-Data?
1.
2.
3.
4.
5.
6.
A Zip Code: 13244
A Zip Code is 5 Characters XXXXX
A List of First Names: Tom, Dick, Harry
A Picture, Like This One:
The Name of the Picture
file FrostTrees.jpg
When you place an order, the quantity of the
item ordered must be a number >0
Something
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Data can be information:
 $5
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strange and confusing:
(the amount of money in my wallet)
Information can be data:
I
calculate student final grades, then place them on a
form sent to the registrar’s office.
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Metadata can be data:
 The
names of MP3 files in your personal collection.
Actually it’s all about context!
What is it, part duex!
Database
Database
Management
System (DBMS)
Elements of a Database
Database
Meta-Data
Data-Management
Data “In”
Information “Out”
Data
End-User
DBMS is software. It stores the data/meta data and “enables” data-management
Clarification via Family Guy
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Brian can write his novel on a
typewriter or w/pen and paper.
But there are obvious
advantages to using word
processing software.
Most databases use DBMS’s just
like most papers are written
with word processors
Database  Brian’s Novel
DBMS  WP Software
Database or DBMS?
Database or DBMS?
Database or DBMS?
Database or DBMS?
Database or DBMS?
Database or DBMS?
Database or DBMS?
Data or Metadata?
Database?
DBMS?
Data or Metadata?
Database?
DBMS?
Evolution of DBMSs
Enterprise DBMS Market Share
Product
Oracle
IBM (DB2)
Microsoft (SQL Server)
Others: (Sybase, NCR Terdata, etc…)
Open Source (MySQL, PostgreSQL, etc…)
Share
44.4%
21.2%
18.6%
5.9%
9.9%
* Source: Computerworld 2007
DBMS deployment plans 2008
* source: gartner
An employable skill in the future.
Source BLS: 2008
http://www.bls.gov/oes/current/oes151061.htm
Data Models: Abstraction Levels
Conceptual
Logical
Internal
Highly Abstract
Hardware and Software
Independent
Somewhat Abstract
Hardware Independent
Software Dependent
External
Physical
Not Abstract (Concrete)
Hardware and Software Dependent
Elements of the DBMS Approach
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Enterprise Data Model
 Graphical model showing high-level entities and relationships
for the organization
Relational Databases
 Database technology involving tables (relations) representing
entities and primary/foreign keys representing relationships
Use of Internet Technology
 Networks and telecommunications, distributed databases,
client-server and 3-tier architectures
Database Applications
 Application programs used to perform database activities
CRUD for database users
THE DATABASE ENVIRONMENT
Questions?