Transcript database - Seneca - School of Information & Communications

DBS201: DBA/DBMS
Lecture 13
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Agenda


The functions of a DBMS
The role of a Data Administrator/ Database
Administrator
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Data as a Corporate Asset

Data are accepted as a valuable asset
requiring careful management

Data are now well understood as a valuable
resource to be translated into information
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If information is accurate and timely, its use is
likely to enhance company’s competitive
position and generate wealth
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Databases

Database’s predominant role is to support
managerial decision making at all levels in the
organization
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DBMS must provide tools that give each level
of management a different view of the data
and support required level of decision making
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Databases

Data is stored in a database and must be
structured and arranged for storage,
extraction and processing

Database consists of a collection of logically
related data stored in a single repository
which consists of end user data and
metadata
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Database Management System

A Database Management System (DBMS)
manages the access to the database (and
ultimately the data)
 Database Management System (DBMS):
 Collection of programs that manages
database structure and controls access to
data
 Sharing of data among multiple
applications and users
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Database Management System
 Makes data management more efficient
and effective
 Query language allows quick answers to
ad hoc queries
 Provides better access to more and bettermanaged data
 Promotes integrated view of organization’s
operations
 Reduces the probability of inconsistent
data
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Database Management System
Figure 1.2
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Database Management System

For Top Management
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Provides the information necessary for strategic
decision making and strategic planning
Provides access to external and internal data
Provides information on company performance
and whether they are achieving their goals
(targets)
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Database Management System

For Middle Management

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Provides data necessary for tactical decisions and
planning
Provides a framework for enforcing and ensuring
the security and privacy of the data
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Database Management System
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For Operational Management
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Provides timely information for customer support
Produce query results within specified
performance levels
Represents and supports the company operations
as closely as possible (operational data)
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DBMS Functions

Data dictionary management

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Data storage management
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Defines data elements and their
relationships
Stores data and related data entry forms,
report definitions, etc
Data transformation and presentation

Translates logical requests into commands
to physically locate and retrieve the
requested data
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DBMS Functions

Security management
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Multi-user access control

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Enforces user security and data privacy
within database
Creates structures that allow multiple
users to access the data
Backup and recovery management

Provides backup and data recovery
utilities
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DBMS Functions
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Data integrity management

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Database language and application
programming interfaces

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Promotes and enforces integrity rules to
eliminate data integrity problems
Provides data access through a query
language
Database communication interfaces

Allows database to accept end-user
requests within a computer network
environment
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Database Design

Importance of Good Design



eliminates data redundancy
eliminates errors leading to bad decisions
Practical Approach


Focus on principles and concepts of database
design
Importance of logical design
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Database vs. File Systems
Figure 1.6
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Database System Environment
Figure 1.7
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The Systems Development Life Cycle
(SDLC)
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The Database Life Cycle (DBLC)
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Parallel Activities in the
DBLC and the SDLC
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Database Administration

Data administration has its roots in the old,
decentralized world of the file system
 Advent of the DBMS and its shared view of
data produced a new level of data
management sophistication and led the DP
department to evolve into an information
systems (IS) department
 Data management became an increasingly
complex job, thus leading to development of
the database administration function
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Database Administrators

Database Administrators
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Responsible for:
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Physical implementation of the DBMS
Security and integrity control of the DBMS
Maintenance of the operational system
Ensuring satisfactory performance of the
applications for users
Requires detailed knowledge of the
target DBMS and the system
environment
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Database Administration
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Database Administration
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Database Administration
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Database Administration
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Database Administration

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Even the most carefully crafted database
system cannot operate without a human
component
Effective data administration requires both
technical and managerial skills
DA must set data administration goals
DBA is the focal point for data/user interaction
Need for diverse mix of skills
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Database Administration
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Database Administration
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Desired DBA Skills
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DBA Activities and Services
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Database Administration

Critical step for any organization is to ensure
its information system supports strategic plans
for each of the company’s business areas

Database administration strategy must not
conflict with information systems plans
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Summary

Data management is critical for any
organization
 Data should be treated as corporate asset
with monetary value
 DBMS is most commonly used electronic tool
for corporate data management
 Database administrator (DBA) is responsible
for corporate database management
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Summary

Broader data management activity is handled
by data administrator (DA)
 DA is more managerially oriented than the
more technically oriented DBA
 Development of data administration strategy
is closely related to the company’s mission
and objectives
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DBA Resource Information

Salary Range for a Database Administrator:
Average = C$45,234 (1 year experience)
 Salary survey examples:

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http://images.globalknowledge.com/wwwimages/pd
fs/2007_SalaryReport.pdf
http://www.payscale.com/research/US/Skill=Oracle/
Salary/by_Job
Job samples:

http://jobsearch.monster.ca/jobsearch.asp?q=datab
ase+administrator&fn=6&lid=240&re=&cy=CA
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