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Total Questions : 64 | Page 1 of 7 pages
Question 1. Locks placed by command are called ________ .
  1.    implicit locks
  2.    explicit locks
  3.    exclusive locks
  4.    shared locks
 Discuss Question
Answer: Option B. -> explicit locks
Question 2. Which of the following occurs when a transaction rereads data and finds new rows that were inserted by a command transaction since the prior read?
  1.    Nonrepeatable read
  2.    Phantom read
  3.    Dirty read
  4.    Consistent read
 Discuss Question
Answer: Option B. -> Phantom read
Question 3. Which of the following locks the item from change but not from read?
  1.    Implicit lock
  2.    Explicit lock
  3.    Exclusive lock
  4.    Shared lock
 Discuss Question
Answer: Option D. -> Shared lock
Question 4. A transaction for which all committed changes are permanent is called:
  1.    atomic.
  2.    consistent.
  3.    isolated.
  4.    durable.
 Discuss Question
Answer: Option D. -> durable.
Question 5. In this instance, dirty reads are disallowed, while nonrepeatable reads and phantom reads are allowed.
  1.    Read committed
  2.    Read uncommitted
  3.    Repeatable read
  4.    Serializable
 Discuss Question
Answer: Option A. -> Read committed
Question 6. The advantage of optimistic locking is that:
  1.    the lock is obtained only after the transaction has processed.
  2.    the lock is obtained before the transaction has processed.
  3.    the lock never needs to be obtained.
  4.    transactions that are best suited are those with a lot of activity.
 Discuss Question
Answer: Option A. -> the lock is obtained only after the transaction has processed.
Question 7. 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?
  1.    Forward only
  2.    Static
  3.    Keyset
  4.    Dynamic
 Discuss Question
Answer: Option C. -> Keyset
Question 8. Which of the following refers to a cursor type where changes of any type and from any source are visible?
  1.    Forward only
  2.    Static
  3.    Keyset
  4.    Dynamic
 Discuss Question
Answer: Option D. -> Dynamic
Question 9. Which of the following disallows both dirty reads and nonrepeatable reads, but allows phantom reads?
  1.    Read committed
  2.    Read uncommitted
  3.    Repeatable read
  4.    Serializable
 Discuss Question
Answer: Option C. -> Repeatable read
Question 10. Dirty read, nonrepeatable, and phantom reads are not possible in this instance.
  1.    Read committed
  2.    Read uncommitted
  3.    Repeatable read
  4.    Serializable
 Discuss Question
Answer: Option D. -> Serializable

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