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Questions and Answers
What is the purpose of the view level of abstraction in a database system?
What is the purpose of the view level of abstraction in a database system?
- To hide the database completely from users
- To make the database structure more complex
- To complicate user interaction by showing the entire database
- To simplify user interaction by providing a partial view of the database (correct)
Why do many users of a database system not need the entire information stored in it?
Why do many users of a database system not need the entire information stored in it?
- Because they prefer working with incomplete data
- Because they want to complicate their interaction with the system
- Because their tasks require accessing only specific parts of the database (correct)
- Because they are not allowed to access all the information
How do you define a new record type in high-level programming languages according to the analogy provided?
How do you define a new record type in high-level programming languages according to the analogy provided?
- By defining a record with at least three fields
- By creating a new record with random fields
- By using pre-defined record types
- By associating names and types with fields (correct)
What is the logical level of abstraction used by database administrators for decision making?
What is the logical level of abstraction used by database administrators for decision making?
How does the logical level of abstraction differ from the view level in a database system?
How does the logical level of abstraction differ from the view level in a database system?
Why do databases provide multiple views for the same database?
Why do databases provide multiple views for the same database?
What is one of the major drawbacks of using file systems to store data?
What is one of the major drawbacks of using file systems to store data?
Which department would benefit from a database system to store information about employee salaries and payroll taxes?
Which department would benefit from a database system to store information about employee salaries and payroll taxes?
Why is it a disadvantage to have different files with the same information duplicated in several places?
Why is it a disadvantage to have different files with the same information duplicated in several places?
Which type of database system application would focus on tracking production in factories and managing the supply chain?
Which type of database system application would focus on tracking production in factories and managing the supply chain?
Why do different programmers creating files over a long period pose a challenge for file-processing systems?
Why do different programmers creating files over a long period pose a challenge for file-processing systems?
In what scenario would using a database system for generating paychecks be most beneficial?
In what scenario would using a database system for generating paychecks be most beneficial?
In an Entity-Relationship (E-R) Model, which component is used to represent entity sets?
In an Entity-Relationship (E-R) Model, which component is used to represent entity sets?
What do ellipses represent in an E-R diagram?
What do ellipses represent in an E-R diagram?
Which component in an E-R diagram represents relationships among entity sets?
Which component in an E-R diagram represents relationships among entity sets?
How is the overall logical structure of a database represented graphically in an E-R diagram?
How is the overall logical structure of a database represented graphically in an E-R diagram?
In the relational model, what does each table represent?
In the relational model, what does each table represent?
What does each column in a table in the relational model have?
What does each column in a table in the relational model have?
What is one of the functions of a database administrator (DBA) according to the text?
What is one of the functions of a database administrator (DBA) according to the text?
Why does a DBA carry out changes to the schema and physical organization?
Why does a DBA carry out changes to the schema and physical organization?
What does granting authorization for data access allow a DBA to do?
What does granting authorization for data access allow a DBA to do?
In database management, what does the transaction-management component ensure?
In database management, what does the transaction-management component ensure?
Why is routine maintenance necessary for a database?
Why is routine maintenance necessary for a database?
What term best describes a collection of operations that performs a single logical function in a database application?
What term best describes a collection of operations that performs a single logical function in a database application?
What is a two-tier architecture?
What is a two-tier architecture?
What does the Presentation Tier do in a three-tier architecture?
What does the Presentation Tier do in a three-tier architecture?
Why might it make sense to use a single-tier architecture for simpler applications?
Why might it make sense to use a single-tier architecture for simpler applications?
In a three-tier architecture, what is included in the Data Tier?
In a three-tier architecture, what is included in the Data Tier?
Which component in a two-tier system runs on the client?
Which component in a two-tier system runs on the client?
What represents a two-tier architecture?
What represents a two-tier architecture?
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