CS 8630 Database Administration, Dr. Guimaraes

08-19-2008

ClassWill

Start Momentarily…

CS8630 Database AdministrationDr. Mario Guimaraes

Introduction and Database Environment

CS 8630 Database Administration, Dr. Guimaraes

Web site

• Class web-site – `http://science.kennesaw.edu/~mguimara/cs8630.htm

Syllabus, Hw, project, etc. (use csmoodle for all hw)

Hw. # 0a) Post a message in the Introduction Forum

at csmoodle.kennesaw.edub) Download Oracle 10g Express and launch it

get disk or see instructions from site Oracle 10g Express: download/Install, Launch

or come by with your laptop Hw # 1 -

Introduction & Relational Algebra

Extra credit homework - evaluate Database CoursewareDO NOT start before Friday. I will give further

instructionsADbC (adbc.kennesaw.edu)

SQL (w3schools)      SQL Tutorial (new lin) !

CS 8630 Database Administration, Dr. Guimaraes

8630

http://science.kennesaw.edu/~mguimara/cs8630.htm

CS 8630 Database Administration, Dr. Guimaraes

Assessment:

• Homework (10%) Homework problems assigned throughout the term. Homework grade will be binary: 5 (completed the assignment with 100% effort), 2 (partially completed), 0 (incomplete). Homework can be discussed with your colleagues, but should be turned in individually. Concepts of homework will frequently appear on the tests. No homework may be turned in after the solutions are posted.

• Class Participation (10%)This is a subjective component. It includes participation in labs, in class and in discussion groups. Exams (30 %)2 exams, 15 points each.

• Paper (20%) You will submit an Abstract and a list of references by October 1. Full paper is due November 1 Project  (25%)  Your project grade will be composed of 1) Final Deliverables 15%, 2) Intermediate Deliverables 2.5%, 3) Oral Presentation graded by class 2.5%, 4) Peer Evaluation from Group Members 5%.

CS 8630 Database Administration, Dr. Guimaraes

File-Based Systems

Three file processing systems (Ch.1)

CS 8630 Database Administration, Dr. Guimaraes

File-Based Systems - Disadvantage

Disadvantages of File Processing Systems• Data dependence

– File structure is defined in the program code.

• Incompatible file formats– Programs are written in different languages, and so cannot easily

access each other’s files.

• Fixed Queries/Proliferation of application programs– Programs are written to satisfy particular functions.– Any new requirement needs a new program.

• Data Redundancy• Separation and isolation of data

– Each program maintains its own set of data.– Users of one program may be unaware of potentially useful data

held by other programs

CS 8630 Database Administration, Dr. Guimaraes

File-Based Systems: example

CS 8630 Database Administration, Dr. Guimaraes

Database Systems

CS 8630 Database Administration, Dr. Guimaraes

Advantages of Database Systems

DBMS: software that administers one or more Databases. Facilitates implementation of:

• Data Independence/Reduced Maintenance• Improved Data Sharing • Increased Application Development

Productivity• Enforcement of Standards• Improved Data Quality (Constraints)• Better Data Accessibility/ Responsiveness• Security, Backup/Recovery, Concurrency• Reduce Redundancy, Reduce inconsistency• Increase Integrity• Use a high level query language• Views: each user views own sub-set of the

database

CS 8630 Database Administration, Dr. Guimaraes

Costs and Risks of the Databases

• New, Specialized Personnel• Installation Management Cost and

Complexity• Conversion Costs• Need for Explicit Backup and Recovery• Organizational Conflict

CS 8630 Database Administration, Dr. Guimaraes

Evolution of databases

CS 8630 Database Administration, Dr. Guimaraes

OO versus Relational

OO betterCOMPLEX DATA TYPES• Sub-types – Reusability• Multi-valued attributes

MAPS better with OO Programming Language

StandardEasy to UseMore people familiar withVendors did a better job

CS 8630 Database Administration, Dr. Guimaraes

ORDB vs. ORDBMS

• Most Relational DBMS are also ORDBMS (to some extent).

• Most DB are purely Relational (Not ORDB).

CS 8630 Database Administration, Dr. Guimaraes

Roles in a DB Environment

• Data Administrator (DA)• Database Administrator (DBA)• Database Designers (Logical and Physical)• Application Programmers• End Users (naive and sophisticated)

CS 8630 Database Administration, Dr. Guimaraes

3-Level Architecture

ANSI-SPARC Three-Level Architecture (Ch.2)

CS 8630 Database Administration, Dr. Guimaraes

3-Level Architecture

ANSI-SPARC Three-Level Architecture• External Level

– Users’ view of the database. – Describes that part of database that is relevant to a

particular user.• Conceptual Level

– Community view of the database. – Describes what data is stored in database and

relationships among the data. • Internal Level

– Physical representation of the database on the computer.

– Describes how the data is stored in the database.

CS 8630 Database Administration, Dr. Guimaraes

3 Level Arch. - Example

Differences between Three Levels of ANSI-SPARC Architecture

CS 8630 Database Administration, Dr. Guimaraes

Database Languages

• Fourth Generation Language (4GL)– Query Languages– Forms Generators– Report Generators– Graphics Generators– Application Generators.

CS 8630 Database Administration, Dr. Guimaraes

File-Server

• File-server is connected to several workstations across a network.

• Database resides on file-server.

• DBMS and applications run on each workstation.

• Disadvantages include:– Significant network traffic.– Copy of DBMS on each workstation.– Concurrency, recovery and integrity control more

complex.

CS 8630 Database Administration, Dr. Guimaraes

File Server Architecture

CS 8630 Database Administration, Dr. Guimaraes

DB Server

DB server architecture (or Client Server)

CS 8630 Database Administration, Dr. Guimaraes

Popular DBMS

• DBMS – software that manages database

• Oracle • DB2 and Informix (IBM)• MS-SQL Server and MS-Access (Microsoft)• Sybase (also iAnywhere: mobile db

solutions)• MySQL and POSTGRES (open source)• Filemaker PRO (apple, Ibm, web, 1 table)

CS 8630 Database Administration, Dr. Guimaraes

End of Lecture

End Of

Today’s

Lecture.