12 Questions
What are the limitations of the hierarchical data model?
Not as flexible as other types of databases, not suited for handling complex data relationships, and not compatible with other database models.
What is the relationship representation in the hierarchical data model?
One-to-many (1:M) relationship.
What is the hierarchical model's behavior when a root segment is deleted?
Dependent segments falling under it are also deleted.
How does the network data model represent data?
Using links between records and allowing child records to have more than one parent.
What are the advantages of the Object-Relational Data Model?
It allows to define user-defined data types and operators and to access them using SQL.
What is a disadvantage of the Object-Relational Data Model?
The information related to user-defined types and operators should be kept in the system catalog, requiring redesigning of the system catalog.
What are the three levels of database architecture?
Internal level, Conceptual level, External level
What is the Internal level in the three-level architecture of the database?
It is the storage where data are actually stored and is also known as the physical level.
What is the initial amount in account A before the debit of $50 to account B?
$300
What is the available amount in account B after the successful transaction T?
$150
Define Isolation in the context of DBMS.
Isolation is the property of a database where no data should affect the other one and may occur concurrently.
What does Durability ensure in the context of DBMS?
Durability ensures the permanency of something.
Learn about the limitations and drawbacks of the hierarchical data model, including the challenges with deleting root segments, updating child segments, and handling complex data relationships. Understand its compatibility issues with other database models and systems.
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