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Data Warehousing
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Question
Data scrubbing is which of the following?
Options
A. A process to reject data from the data warehouse and to create the necessary indexes
B. A process to load the data in the data warehouse and to create the necessary indexes
C. A process to upgrade the quality of data after it is moved into a data warehouse
D. A process to upgrade the quality of data before it is moved into a data warehouse
Correct Answer
A process to upgrade the quality of data before it is moved into a data warehouse
More questions
1. The benefits of a standard relational language include which of the following?
Options
A. Reduced training costs
B. Increased dependence on a single vendor
C. Applications are not needed.
D. All of the above.
Show Answer
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Correct Answer: Reduced training costs
2. In ODL, you specify an operation using parentheses after its name.
Options
A. True
B. False
Show Answer
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Correct Answer: True
3. The JVM (Java virtual machine) interprets Java bytecode at run time.
Options
A. True
B. False
Show Answer
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Correct Answer: True
4. A rule of thumb for choosing indexes for a relational database includes which of the following?
Options
A. Indexes are more useful on smaller tables.
B. Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries.
C. Do not specify a unique index for the primary key of each table.
D. Be careful indexing attributes that have null values.
Show Answer
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Correct Answer: Be careful indexing attributes that have null values.
5. Changing cardinalities in a database is:
Options
A. a common database design task.
B. a rare database design task, but does occur.
C. a database design task that never occurs.
D. is impossible to do, so a new database must be constructed and the data moved into it.
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Correct Answer: a common database design task.
6. ________ is an object-oriented interface that encapsulates data-server functionality.
Options
A. ODBC
B. OLE DB
C. JPCD
D. ADO
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Correct Answer: OLE DB
7. The following are components of a database except ________ .
Options
A. user data
B. metadata
C. reports
D. indexes
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Correct Answer: reports
8. Which of the following is a technique for hiding the internal implementation details of an object?
Options
A. Encapsulation
B. Polymorphism
C. Inheritance
D. All of the above.
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Correct Answer: Encapsulation
9. The three-schema components include all, but:
Options
A. internal schema.
B. conceptual schema.
C. programming schema.
D. external schema.
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Correct Answer: programming schema.
10. Routers are used to transmit message packets and forward them to the correct destination over the most efficient pathway available.
Options
A. True
B. False
Show Answer
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Correct Answer: True
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