Final answer:
Physical designers must factor in data nature and storage efficiency when selecting data types. Enhancing database integrity involves using constraints, triggers, audits, and access controls. A DBMS offers advantages like data integrity and security, while file-based systems may suffer from redundancy and poor security.
Step-by-step explanation:
Factors in Selection of Data Types for Attributes
When a physical designer is selecting a data type for an attribute, they should consider the following factors:
- The nature of the data being stored.
- Storage efficiency and how much space the data type requires.
- Performance in terms of how quickly data can be retrieved and processed.
- Compatibility with other systems that may interact with the database.
- The potential for future data type modifications as the system evolves.
Ways to Enhance Database Integrity
- Implement constraints such as primary keys, foreign keys, unique constraints, and check constraints.
- Use triggers and stored procedures to maintain consistency.
- Regular audits and data validation.
- Apply access controls to restrict unauthorized data manipulation.
Advantages of DBMS Approach
- Data consistency and integrity.
- Improved data sharing and accessibility.
- Increased data security.
- Efficient data management through abstraction and encapsulation.
Disadvantages of File-Based System Approach
- Data redundancy and inconsistency.
- Lack of scalability.
- Difficulties with data sharing and concurrent access.
- Poor data security.
Functions of DBMS
- Data storage management.
- Data retrieval and manipulation.
- Transaction management and concurrency control.
- Backup and recovery mechanisms.
- Access control and security enforcement.