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

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 theData?Where’s the Metadata?

Where is the:

Data?Meta-Data?

Activity: Data or Meta-Data?

1. A Zip Code: 132442. A Zip Code is 5 Characters XXXXX3. A List of First Names: Tom, Dick, Harry4. A Picture, Like This One:5. The Name of the Picture

file FrostTrees.jpg6. When you place an order, the quantity

of the item ordered must be a number >0

Something strange and confusing:

Data can be information: $5 (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.

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

Meta-Data

Data

DatabaseData-Management

Data “In”

Information “Out”

End-User

DBMS is software. It stores the data/meta data and “enables” data-management

Clarification via Family Guy

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 NovelDBMS WP Software

Build Database Applications to solve business problems.For example…LeadDist, Rebranding, inout, my.ischool,

What Can You Do with a DBMS?

Is this: Database or DBMS?

Database or DBMS?

Database or DBMS?

SQL Server: Database or DBMS?

Database or DBMS?

Database or DBMS?

Four Ways to Slice Obama’s 2013 Budget Proposalhttps://www.nytimes.com/interactive/2012/02/13/us/politics/2013-budget-proposal-graphic.html?_r=0

Database or DBMS?

Fundamental Axioms of DBMSs

Users communicate with computer applications (websites, etc)

Computer applications communicate with DBMSs.

Users do not communicate with DBMSs directly.

As a result DBMSs although they can be used interactively, are not used interactively.

A DBMS is not a replacement for sound database design principles.

First of many examples for the semester

https://my.ischool.syr.edu

Db using Relational Model

YouWebsit

e

User Interface

and Business

Logic (HTML/C#)

Data access

logic and Data (SQL)

Web Browser

Web Server (IIS) SQL Server

ApplicationComponents

More Examples, with Stories.

Data or Metadata?

Database?

DBMS?

Data or Metadata?

Database?

DBMS?

History: There are Other DBMSs

Enterprise DBMS Market Share

Product Share

Oracle 44.4%

IBM (DB2) 21.2%

Microsoft (SQL Server) 18.6%

Others: (Sybase, NCR Terdata, etc…) 5.9%Open Source (MySQL, PostgreSQL, etc…)

9.9%* Source: Computerworld 2007

DBMS deployment plans 2008

* source: gartner

An employable skill in the future.

Source BLS: 2008http://www.bls.gov/oes/current/oes151061.htm

THE DATABASE ENVIRONMENT

Questions?

Reminder(s):

Quiz Wednesday on Unit 1

We meet in Hinds 010