Embed Size (px)
Citation preview
1
DBS201: DBA/DBMS
Lecture 13
2
Agenda
The functions of a DBMS The role of a Data Administrator/ Database
Administrator
3
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
If information is accurate and timely, its use is likely to enhance company’s competitive position and generate wealth
4
Databases
Database’s predominant role is to support managerial decision making at all levels in the organization
DBMS must provide tools that give each level of management a different view of the data and support required level of decision making
5
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
6
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
7
Makes data management more efficient and effective Query language allows quick answers to ad hoc
queries Provides better access to more and better-managed
data Promotes integrated view of organization’s operations Reduces the probability of inconsistent data
Database Management System
8
Figure 1.2
Database Management System
9
For Top Management 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)
Database Management System
10
For Middle Management Provides data necessary for tactical decisions and
planning Provides a framework for enforcing and ensuring
the security and privacy of the data
Database Management System
11
For Operational Management 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)
Database Management System
12
DBMS Functions
Data dictionary management Defines data elements and their
relationships
Data storage management 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
13
DBMS Functions
Security management Enforces user security and data privacy
within database
Multi-user access control Creates structures that allow multiple
users to access the data
Backup and recovery management Provides backup and data recovery
utilities
14
DBMS Functions
Data integrity management Promotes and enforces integrity rules to
eliminate data integrity problems Database language and application
programming interfaces Provides data access through a query
language Database communication interfaces
Allows database to accept end-user requests within a computer network environment
15
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
Database Design
16
Database vs. File Systems
Figure 1.6
17
Database System Environment
Figure 1.7
18
The Systems Development Life Cycle (SDLC)
19
The Database Life Cycle (DBLC)
20
Parallel Activities in the DBLC and the SDLC
21
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
22
Database Administrators
Database Administrators Responsible for:
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
23
Database Administration
24
Database Administration
25
Database Administration
26
Database Administration
27
Database Administration
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
28
Database Administration
29
Database Administration
30
Desired DBA Skills
31
DBA Activities and Services
32
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
33
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
34
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
35
DBA Resource Information
Salary Range for a Database Administrator: Average = C$45,234 (1 year experience)
Salary survey examples: http://images.globalknowledge.com/wwwimages/pdf
s/2007_SalaryReport.pdf http://www.payscale.com
/research/US/Skill=Oracle/Salary/by_Job
Job samples: http://jobsearch.monster.ca/jobsearch.asp?
q=database+administrator&fn=6&lid=240&re=&cy=CA
