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- Question
A subset of the database which contain virtual data that is derived from the database files but is not explicitly stored is called
Options- A. Touple
- B. View
- C. Relation
- D. Key
- Correct Answer
- View
ExplanationA view may be a subset of the database or it may contain virtual data that is derived from the database files but is not explicitly stored .
- 1. We Can still delete a row from primary table if there are related rows in secondary table once a refferential integrity is enforced
Options- A. TRUE
- B. FALSE Discuss
- 2. A data dictionary is a special file that contains
Options- A. The width of all fields in all files
- B. The data type of all fields in all file
- C. The name of all fields in all files
- D. All of the above Discuss
- 3. Cloud computing is not suited for situations
Options- A. where complex legacy systems have to be ported
- B. characterized by limited-time tasks
- C. involving offloading of expensive computing tasks
- D. with no existing regulatory compliance issues Discuss
- 4. Cloud computing uses Server virtualization.
Options- A. TRUE
- B. FALSE Discuss
- 5. The ODBC Level 1 API contains which of the following functions?
Options- A. Browse possible connections and data sources only
- B. Connect to data sources with driver-specific information only
- C. Process a scrollable cursor only
- D. Both 1 and 3 above are in the OBDC Level 1 API. Discuss
- 6. Database is a collection of concepts that can be used to describe the structure of a database
Options- A. TRUE
- B. FALSE Discuss
- 7. Representation level data models provide the concepts that are close to the way many users perceive data
Options- A. TRUE
- B. FALSE Discuss
- 8. Physical data models describe the details of how data is stored in the computers
Options- A. TRUE
- B. FALSE Discuss
- 9. What is schema? Discuss
- 10. The capacity to change the conceptual schema without having to change external schemas or application programs is called
Options- A. Physical Data Independence
- B. Logical Data Independence
- C. Both A and B
- D. None Discuss
Database problems
Search Results
Correct Answer: FALSE
Explanation:
Can?t delete a row from primary table if there are related rows in secondary table.
Correct Answer: All of the above
Explanation:
A data dictionary is a special file that contains a set of information describing the contents, format, and structure of a database and the relationship between its elements, used to control access to and manipulation of the database.
Correct Answer: where complex legacy systems have to be ported
Explanation:
Cloud computing is not suited for situations where complex legacy systems have to be ported.
Correct Answer: TRUE
Correct Answer: Connect to data sources with driver-specific information only
Correct Answer: TRUE
Explanation:
Database provides necessary means to achieve this abstraction. By structure of a database we mean the data types, relations, and constraints that should hold on the data.
Correct Answer: FALSE
Explanation:
High level data models provide the concepts that are close to the way many users perceive data
Correct Answer: TRUE
Explanation:
They describe the details of how data is stored in the computers
Correct Answer: The description of a data base is called the database schema , which is specified during database design and is not expected to change frequently A displayed schema is called schema diagram We call each object in the schema as schema construct
Correct Answer: Logical Data Independence
Explanation:
LDI is the capacity to change the conceptual schema without having to change external schemas or application programs.
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