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Chapter 2Introduction to
Database Development
Database Processing
David M. Kroenke© 2000 Prentice Hall
Database Components
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Types of Data
• User data• Metadata• Indexes• Application Metadata
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User Data
• A table of data called a relation• Columns are fields or attributes• Rows are entities• Relations must be structured
properly
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Metadata
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“A description of the structure of the database”
• System tables store metadata– number of tables and table names– number of fields and field names– primary key fields– field names, data types, and length
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Indexes
• Improve performance• Improve accessibility• (Overhead data)
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Application Metadata
• Stores the structure and format of– forms– reports– queries– other application components
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The DBMS
• Design Tools Subsystem• Run-Time Subsystem• DBMS Engine
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The Design Tools Subsystem
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• Tools to design and develop– tables– forms– queries– reports
• Programming Languages– macros– languages
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Run-Time Subsystem
Chapter 1
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• Processes database components created by design tools
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DBMS Engine
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• Intermediary between the design tools and run-time subsystems and the data
• Also handles . . .– transaction management– locking– backup and recovery
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Database Schema
• Defines a database’s structure– tables - subjects within the database– relationships - one-to-many or 1:N– domains - set of values a column may
have– business rules - restrictions on data
values
Table Design in Access 2000
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Relationships in Access 2000
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Components of Applications
• Forms• Queries• Reports• Menus• Application Programs
Forms in Access 2000
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Forms in Access 2000
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Forms in Access 2000
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Queries in Access 2000
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Reports in Access 2000
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Menus in Access 2000
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Visual Basic in Access 2000
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Database Development Process Terminology
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• Prototype - sample database• Top-down development - general
to specific (global perspective)• Bottom-up development - specific
to general (faster, less risky)
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Data Modeling
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• Interviewing users• documenting requirements• building a data model• building a database prototype• a process of inference (working
backwards)
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Data Models
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• Entity-Relationship Model• Semantic Object Model
