Managing Multiuser Databases problems
- 1. Which of the following locks the item from change but not from read?
Options- A. Implicit lock
- B. Explicit lock
- C. Exclusive lock
- D. Shared lock Discuss
Correct Answer: Shared lock
- 2. What is the overall responsibility of the DBA?
Options- A. Facilitate the development and use of the database
- B. Create and populate tables
- C. Development, operation, and maintenance of the database and its applications
- D. Both the first and third answers above are correct. Discuss
Correct Answer: Both the first and third answers above are correct.
- 3. Which of the following locks the item from access of any type?
Options- A. Implicit lock
- B. Explicit lock
- C. Exclusive lock
- D. Shared lock Discuss
Correct Answer: Exclusive lock
- 4. Which of the following allows dirty reads, nonrepeatable reads and phantom reads to occur?
Options- A. Read committed
- B. Read uncommitted
- C. Repeatable read
- D. Serializable Discuss
Correct Answer: Read uncommitted
- 5. Which of the following refers to a cursor type that when the cursor is opened, a primary key value is saved for each row in the recordset; when the application accesses a row, the key is used to fetch the current values of the row?
Options- A. Forward only
- B. Static
- C. Keyset
- D. Dynamic Discuss
Correct Answer: Keyset
- 6. Which of the following disallows both dirty reads and nonrepeatable reads, but allows phantom reads?
Options- A. Read committed
- B. Read uncommitted
- C. Repeatable read
- D. Serializable Discuss
Correct Answer: Repeatable read
- 7. A transaction in which either all of the database actions occur or none of them do is called:
Options- A. atomic.
- B. consistent.
- C. isolated.
- D. durable. Discuss
Correct Answer: atomic.
- 8. Dirty read, nonrepeatable, and phantom reads are not possible in this instance.
Options- A. Read committed
- B. Read uncommitted
- C. Repeatable read
- D. Serializable Discuss
Correct Answer: Serializable
- 9. The size of a lock is called:
Options- A. implicit lock.
- B. lock granularity.
- C. exclusive lock.
- D. shared lock. Discuss
Correct Answer: lock granularity.
- 10. Locks placed by the DBMS are called ________ .
Options- A. implicit locks
- B. explicit locks
- C. exclusive locks
- D. shared locks Discuss
Correct Answer: implicit locks
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