database administration

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Chapter 8

Database Administration

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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 is usually a group May refer to one person also called a

database administrator

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DBA ResponsibilitiesFigure 8.1

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Policy Formulation and Implementation

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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Access Privileges for SamFigure 8.2

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Access Privileges for PaigeFigure 8.3

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Access Privileges for ValerieFigure 8.4

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Attempted Security Violation by BradyFigure 8.5

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Attempted Security Violation by PaigeFigure 8.6

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DBMS Supplies Security FeaturesFigure 8.7

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Supplemented Security FeaturesFigure 8.8

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Policy Formulation and Implementation (con’t.)

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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Movement of Data to ArchiveFigure 8.9

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Policy Formulation and Implementation

DBMS Evaluation and Selection Preparation of checklist Evaluation of various DBMSs according to

selected categories Comparison of results

DBMS Maintenance Configuration changes Upgrades for new releases Problem resolution

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Policy Formulation and Implementation (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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Interaction Between Test and Production Systems

Figure 8.11

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Technical Functions (con’t.)

Performance Tuning DBA attempts to get best performance with

funding constraints Creating indexes, splitting tables, changing table

design Denormalization

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Customer TableFigure 8.12

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Split Customer TableFigure 8.13a

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Split Customer TableFigure 8.13b

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Including Part Descriptions in OrderLine Table

Figure 8.14