database planning and design

COMP313 – Database Management System

Database Planning and Design

Overview of the System Development Life Cycle

SDLC is the acronym that is used to label the System Development Life Cycle.

The SDLC traces the history of an information system from its initial stage to its obsolescence.

The SDLC is composed of five phases: planning, analysis, design, implementation, and maintenance.

• Traces the history of an information system

• Split into 5 phases

• Database design an essential component of the SDLC


• Initial Assessment• Feasibility Study• Should the existing

system be:

i) Continued?ii) Modified?iii)Replaced?

• System Cost• Technology


• User Requirements

• Existing System Evaluation

• Logical System Design


• Detailed Specifications

• Screen, menu, report layouts

• Conversion from old to new


• Coding

• Testing

• Debugging

• Installation


• Evaluation

• Maintenance• System Errors• Business

Changes

• Enhancements



There are many different models and methodologies, but each generally consists of a series of defined steps or stages.”

How does Database Design Relate to the SDLC?

As a specific type of information system, Database Design can be modeled using a similar SDLC type approach, sometimes referred to as DBLC or the Database Development Life Cycle.

Database Development Life Cycle

The SDLC traces the history (life cycle) of an information system.

The DBLC traces the history (life cycle) of a database system.

Since we know that the database serves the information system, it is not surprising that the two life cycles conform to the same basic phases.

• Traces the history of the creation of a database

• Split into 6 phases


• Analyze company situation

• Define Problem and Constraints

• Define Objectives

• Define Scope and Boundaries


• Conceptual Design• ER-Diagram /

Normalization

• DBMS Software Selection

• Create the Logical Design

• Create the Physical Design


• Install the selected DBMS

• Create the databases

• Load the data / Convert from Old System


• Test the Database

• Fine-Tune the Database

• Evaluate the Database and its Application Programs


• Produce the required information flow

• Alternate form of testing


• Changes to the System (from operation, bugs, business changes)

• Enhancements


END OF PRESENTATIONThank you…

database planning and design

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