Database administration and security

Database Systems: Design,
Implementation, and
Management
Eighth Edition
Chapter 15
Database Administration and Security

Database Systems, 8th
Edition 2
Objectives
• In this chapter, you will learn:
– Data are a valuable business asset requiring
careful management
– How a database plays a critical role in an
organization
– Introduction of a DBMS has technological,
managerial, and cultural organizational
consequences

Edition 3
Objectives (continued)
• In this chapter, you will learn: (continued)
– Database administrator’s managerial and
technical roles
– Data security, database security, and the
information security framework
– Several database administration tools and
strategies
– How various database administration technical
tasks are performed with Oracle

Edition 4
Data as a Corporate Asset
• Data are a valuable asset that require careful
management
• Data are a valuable resource that translate into
information
• Accurate, timely information triggers actions
that enhance company’s position and generate
wealth

Edition 5

Edition 6
The Need for and Role of Databases
in an Organization
• Database’s predominant role is to support
managerial decision making at all levels
• DBMS facilitates:
– Interpretation and presentation of data
– Distribution of data and information
– Preservation and monitoring of data
– Control over data duplication and use
• Three levels to organization management:
– Top, middle, operational

Edition 7
Introduction of a Database:
Special Considerations
• Introduction of a DBMS is likely to have a
profound impact
– Might be positive or negative, depending on how
it is administered
• Three aspects to DBMS introduction:
– Technological
– Managerial
– Cultural
• One role of DBA department is to educate end
users about system uses and benefits

Edition 8
The Evolution of the Database
Administration Function
• Data administration has its roots in the old,
decentralized world of the file system
• Advent of DBMS produced new level of data
management sophistication
– DP department evolved into information systems
(IS) department
• Data management became increasingly
complex
– Development of database administration
function

Edition 9
The Database Environment’s
Human Component
• Even most carefully crafted database system
cannot operate without human component
• Effective data administration requires both
technical and managerial skills
• DA must set data administration goals
• DBA is focal point for data/user interaction
• Need for diverse mix of skills

Edition 10

Edition 11
The DBA’s Managerial Role
• DBA responsible for:
– Coordinating, monitoring, allocating resources
• Resources include people and data
– Defining goals and formulating strategic plans
• Interacts with end user by providing data and
information
• Enforces policies, standards, procedures
• Manages security, privacy, integrity
• Ensures data can be fully recovered
• Ensures data distributed appropriately

Edition 12
The DBA’s Technical Role
• Evaluates, selects, and installs DBMS and
related utilities
• Designs and implements databases and
applications
• Tests and evaluates databases and
applications
• Operates DBMS, utilities, and applications
• Trains and supports users
• Maintains DBMS, utilities, and applications

Edition 13
Security
• Securing data entails securing overall
information system architecture
• Confidentiality: data protected against
unauthorized access
• Integrity: keep data consistent and free of
errors or anomalies
• Availability: accessibility of data by authorized
users for authorized purposes

Edition 14
Security Policies
• Database security officer secures the system
and the data
– Works with the database administrator
• Security policy: collection of standards,
policies, procedures to guarantee security
– Ensures auditing and compliance
• Security audit process identifies security
vulnerabilities
– Identifies measures to protect the system

Edition 15
Security Vulnerabilities
• Security vulnerability: weakness in a system
component
– Could allow unauthorized access or cause
service disruptions
• Security threat: imminent security violation
– Could occur at any time
• Security breach yields a database whose
integrity is:
• Preserved
• Corrupted

Edition 16

Edition 17

Edition 18
Database Security
• Refers to the use of DBMS features and other
measures to comply with security requirements
• DBA secures DBMS from installation through
operation and maintenance
• Authorization management:
– User access management
– View definition
– DBMS access control
– DBMS usage monitoring

Edition 19
Database Administration Tools
• Two main types of data dictionaries:
– Integrated
– Standalone
• Active data dictionary automatically updated
by the DBMS with every database access
• Passive data dictionary requires running a
batch process
• Main function: store description of all objects
that interact with database

Edition 20
Database Administration Tools
(continued)
• Data dictionary that includes data external to
DBMS becomes flexible tool
– Enables use and allocation of all organization’s
information
• Metadata often the basis for monitoring
database use
– Also for assigning access rights to users
• DBA uses data dictionary to support data
analysis and design

Edition 21
CASE Tools
• Computer-aided systems engineering
– Automated framework for SDLC
– Structured methodologies and powerful
graphical interfaces
• Front-end CASE tools provide support for
planning, analysis, and design phases
• Back-end CASE tools provide support for
coding and implementation phases
• Typical CASE tool has five components

Edition 22

Edition 23
Developing a Data
Administration Strategy
• Information engineering (IE) translates
strategic goals into data and applications
• Information systems architecture (ISA) is the
output of IE process
• Implementing IE is a costly process
– Provides a framework that includes use of
computerized, automated, and integrated tools
• Success of information systems strategy
depends on critical success factors
– Managerial, technological, and corporate culture

Edition 24
The DBA at Work: Using Oracle for
Database Administration
• Technical tasks handled by the DBA in a
specific DBMS:
– Creating and expanding database storage
structures
– Managing database objects
– Managing end-user database environment
– Customizing database initialization parameters
• All DBMS vendors provide programs to perform
database administrative tasks

Edition 25
Oracle Database Administration Tools
• In Oracle, most
DBA tasks
performed via
Oracle
Enterprise
Manager
interface

Edition 26
The Default Login
• Must connect to the database to perform
administrative tasks
– Username with administrative privileges
• Oracle automatically creates SYSTEM and
SYS user IDs with administrative privileges
• Define preferred credentials by clicking on
Preferences link, then Preferred Credentials
• Username and passwords are database-
specific

Edition 27
Ensuring an Automatic RDBMS Start
• DBA ensures database access automatically
started when computer turned on
• Service is a Windows system name for a
special program that runs automatically
– Part of the operating system
• Database instance: separate location in
memory reserved to run the database
– May have several databases running in memory
at the same time

Edition 28
Creating Tablespaces and Datafiles
• Database composed of one or more
tablespaces
• Tablespace is a logical storage space
– Physically stored in one or more datafiles
• Datafile physically stores the database’s data
– Each datafile can reside in a different directory
on the hard disk
• Database has 1:M relationship with tablespaces
• Tablespace has 1:M relationship with datafiles

Edition 29
Managing the Database Objects:
Tables, Views, Triggers, and
Procedures
• Database object: any object created by end
users
• Schema: logical section of the database that
belongs to a given user
– Schema identified by a username
– Within the schema, users create their own tables
and other objects
• Normally, users authorized to access only the
objects that belong to their own schemas

Edition 30
Managing Users and
Establishing Security
• User: uniquely identifiable object
– Allows a given person to log on to the database
• Role: a named collection of database access
privileges
– Authorizes a user to connect to the database
and use system resources
• Profile: named collection of settings
– Controls how much of a resource a given user
can use

Edition 31
Customizing the Database
Initialization Parameters
• Fine-tuning requires modification of database
configuration parameters
– Some are changed in real time using SQL
– Some affect database instance
– Others affect entire RDBMS and all instances
• Initialization parameters reserve resources
used by the database at run time
• After modifying parameters, may need to restart
the database

Edition 32
Creating a New Database
• General database creation format tends to be
generic
– Execution tends to be DBMS-specific
• Leading RDBMS vendors offer option to create
databases manually
– Use SQL commands or GUI-based process
• Oracle Database Configuration Assistant uses
a wizard interface

Edition 33

Edition 34

Edition 35

Edition 36

Edition 37

Edition 38

Edition 39

Edition 40

Edition 41

Edition 42

Edition 43

Edition 44

Edition 45

Edition 46
Summary
• Data management is a critical activity for any
organization
– Data should be treated as a corporate asset
• DBMS is the most commonly used electronic
tool for corporate data management
• DBMS has impact on organization’s managerial,
technological, and cultural framework
• Data administration function evolved from
centralized electronic data processing
– Applications began to share common repository

Edition 47
Summary (continued)
• Database administrator (DBA) is responsible
for managing corporate database
• Broader data management activity is handled
by data administrator (DA)
• DA is more managerially oriented than more
technically oriented DBA
– DA function is DBMS-independent
– DBA function is more DBMS-dependent
• When there is no DA, DBA executes all DA
functions

Edition 48
Summary (continued)
• Managerial services of DBA function:
– Supporting end-user community
– Defining and enforcing policies, procedures, and
standards for database function
– Ensuring data security, privacy, and integrity
– Providing data backup and recovery services
– Monitoring distribution and use of data in
database

Edition 49
Summary (continued)
• Technical role of DBA:
– Evaluating, selecting, and installing DBMS
– Designing and implementing databases and
applications
– Testing and evaluating databases and
applications
– Operating DBMS, utilities, and applications
– Training and supporting users
– Maintaining DBMS, utilities, and applications

Edition 50
Summary (continued)
• Security ensures confidentiality, integrity,
availability of information system and data
• Security policy is a collection of standards,
policies, and practices
• Security vulnerability is a weakness in system
component
• Information engineering guides development
of data administration strategy
• CASE tools and data dictionaries translate
strategic plans to operational plans

Database administration and security

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