Data Dictionary in System Analysis and Design
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A data dictionary is a structured repository of metadata that serves as a reference for data analysis, helping to simplify data requirements and system design. It contains essential elements such as data flow, structures, descriptive information, and data stores while ensuring that updates are reflected throughout the system. Its importance lies in enhancing documentation, improving communication among users, and facilitating database and system development.
Data Dictionary in System Analysis and Design
- 2. Contents • Data Dictionary • Use of Data Dictionary • Elements of Data Dictionary • Data Dictionary Analysis • Importance of Data Dictionary Page 2 out of 8
- 3. Data Dictionary • Data dictionary is a structured repository of data about data (metadata) • It is a reference work of metadata. • It is one of the main method for analyzing the data flows and data stores of a system. Page 3 out of 8
- 4. Use of Data Dictionary Data dictionary is use to: • Simplify the structure for meeting the data requirements. • Create reports, screens, and forms. • Generate computer program source code. • Analyze the system design for completion and to detect design architecture. Page 4 out of 8
- 5. Elements of Data Dictionary Data Dictionary contains • Data flow- is a path of data from source document to data entry to process final reports. • Data structures-are a group of smaller structures and elements represented by algebraic notation. • Elements- such as, descriptive information, length and type of data information, validation criteria and default values. • Data stores-contain a minimal of all base elements as well as many derived elements Page 5 out of 8
- 6. Data Dictionary Analysis Data dictionary should be tied into other programs in the system that when an item is updated or deleted from the data dictionary it is automatically updated or deleted from the whole data flow or system. Data dictionary allows to record the standard pieces of information about elements in one project, and it makes that information accessible to many parts of a it. Page 6 out of 8
- 7. Importance of Data Dictionary • Documentation- it is a valuable reference in any organization. • It improves analyst/user communication by establishing consistent definitions of various elements, terms and procedures • It is important step in building a database and design whole system. Page 7 out of 8
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