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INSY 3304 FINAL REVIEW QUESTIONS & ANSWERS 2024/2025 $9.49   Add to cart

Exam (elaborations)

INSY 3304 FINAL REVIEW QUESTIONS & ANSWERS 2024/2025

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  • 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...

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  • September 19, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • INSY 3304
  • INSY 3304
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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



Implementation - ANSWERShierarchical, network, relational, Object Oriented

-It does support many to many 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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