Concepts of Database Concepts of Database Management, Fifth Management, Fifth Edition Edition Chapter 8: Chapter 8: Database Administration Database Administration
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Concepts of Database Concepts of Database Management, Fifth Management, Fifth
EditionEdition
Chapter 8: Chapter 8:
Database AdministrationDatabase Administration
2Concepts of Database Management, 5th Edition
Objectives
Discuss the need for database administration (DBA)
Explain the DBA’s responsibilities in formulating and enforcing database policies for access privileges, security, disaster planning, and archiving
Discuss the DBA’s administrative responsibilities for DBMS evaluation and selection, DBMS maintenance, data dictionary management, and training
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Objectives
Discuss the DBA’s technical responsibilities for database design, testing, and performance tuning
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Database Administration (DBA)
Resource that supervises database and use of DBMS
DBA functions are usually performed by a group
May refer to one person also called a database administrator
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Figure 8.1:DBA Responsibilities
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Policy Formulation and Enforcement
Access Privileges
Users access the database only in ways in which they are entitled
Security
Access restrictions ensure database is secure
Passwords, encryption, and views implement security
Effective password protection critical
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Figure 8.2: Access Privileges for Sam
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Figure 8.3: Access Privileges for Paige
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Figure 8.4: Access Privileges for Valerie
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Figure 8.5: Attempted Security Violation by Brady
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Figure 8.6: Attempted Security Violation by Paige
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Figure 8.7: DBMS Supplies Security Features
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Figure 8.8: Supplemented Security Features
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Policy Formulation and Enforcement
Disaster Planning
Protection against physical damage
Use DBMS backup and recovery tools with supplements where needed
Disaster recovery plan
Archiving
Place to keep corporate data
Mass-storage device used for archiving
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Figure 8.9:Movement of Data to Archive
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Other Database Administrative Functions
DBMS Evaluation and Selection Data definition Data restructuring Nonprocedural languages Procedural languages Data dictionary Concurrent update Backup and recovery Security Integrity
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Other Database Administrative Functions (Con’t.)
Replication and distributed databases Limitations Documentation and training Vendor support Performance Portability Cost Future plans Other considerations
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Other Database Administrative Functions (Con’t.)
DBMS Maintenance
Configuration changes
Upgrades for new releases
Problem resolution
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Other Database Administrative Functions (Con’t.)
Data Dictionary Management
Is essentially database catalog with wider range of information
Updates the data dictionary
Establishes naming conventions for tables, fields, etc.
Creates data integrity rules
Training
How to use DBMS and database
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Technical Functions
Database Design
Establishes sound methodology for database design
Creates documentation standards
Manages changes
Testing
DBA controls production system
Grants privileges to programmers to modify and test software
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Figure 8.11: Interaction Between Test and Production Systems
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Technical Functions (con’t.)
Performance Tuning
DBA attempts to get best performance with funding constraints
Create indexes, splitting tables, changing table design
Denormalization - process that creates a table not in 3NF to optimize performance
JOINs may be too costly to just scan data
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Figure 8.12: Customer Table
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Figure 8.13a: Split Customer Table
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Figure 8.13b: Split Customer Table
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Figure 8.14: Including Part Descriptions in OrderLine Table
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Summary Database administration (DBA) - person or group
responsible for supervising database and use of database management system (DBMS)
DBA formulates and enforces policies about
Users who can access database
Portions of database they may access
In what manner they can access database
DBA formulates and enforces policies about security
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Summary DBA
Creates and implements backup and recovery procedures
Formulates and enforces policies that govern the management of an archive for data
Leads effort to evaluate and select new DBMS Installs and maintains DBMS after it has been
selected and procured Maintains data dictionary, establishes naming
conventions for its contents, and provides information from it to others in the organization
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Summary DBA
Coordinates and provides database and DBMS training
Verifies all information-level database designs, completes all physical-level database designs, and creates documentation standards
Controls production system, which is accessible only to authorized users
Tunes database design to improve performance
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