INSY 3304 FINAL REVIEW QUESTIONS & ANSWERS 2024/2025
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Module
INSY 3304
Institution
INSY 3304
INSY 3304 FINAL REVIEW QUESTIONS & ANSWERS 2024/2025
Limitations of a file system in data management - ANSWERS- Data dependence
- Structural dependence
- Data redundancy leading to deletion, insertion, and modification anomalies
Components of a DBMS/database Environment - ANSWERS- hardwar...
INSY 3304 FINAL REVIEW QUESTIONS &
ANSWERS 2024/2025
Limitations of a file system in data management - ANSWERS- Data dependence
- Structural dependence
- Data redundancy leading to deletion, insertion, and modification anomalies
Components of a DBMS/database Environment - ANSWERS- hardware, software, people, procedure, and
data
Data Modeling - ANSWERSis iterative and progressive
Database models - ANSWERSConceptual and Implementation
Conceptual - ANSWERSThe conceptual model provides a global view of an entire database. Describes the
main data objects, avoiding details and define what the relationships are.
entities and relationships, different types of relationships
Hierarchical - ANSWERSupside down tree structure, 1-M relationship
-easy to understand, but drawbacks: no standards, data dependency
Network- - ANSWERSupside down tree structure, supports M-M relationships
-standards, but data dependency, difficult to implement because of the many to many
Object Oriented - ANSWERSdata becomes active component of system using methods and attributes
, -You can use these Code reuse, polymorphism, encapsulation in the database
Relational: - ANSWERSstill most popular dbms model
Different levels of data models - ANSWERSConceptual, Internal, External, Physical
Conceptual Database model - ANSWERSThe output of the conceptual design process. The conceptual
model provides a global view of an entire database. Describes the main data objects, avoiding details.
-highest level, contains least detail, not hardware or software dependent.
internal Database model - ANSWERSrefers to a level of data abstraction that adapts the conceptual
model to a specific DBMS model for implementation.
-adapt conceptual model to dbms that's chosen.
External Database model - ANSWERSThe application programmer's view of the data environment. Given
its businessunit focus, an external model works with a data subset of the global database schema.
-both are software dependent, gives a breakdown of model into functional units
Physical Database model - ANSWERSmodel in which the physical characteristics (location, path, and
format) are described for the data. Both hardware- and software-dependent.
-mapping out how to get to data, access paths,
Basic concepts about the relational database model - ANSWERSentities, attributes, tables, rows,
columns, domain of an attribute, cardinality, connectivity
Entity - ANSWERSperson place or thing that you want to store data about (represented as a table or
relation)
+represented by rectagle
Attributes - ANSWERScharacteristic or property of the data or of the entity, stored as columns
+represented by ovals
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