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Oracle MySQL 8.0 Database Developer Sample Questions (Q26-Q31):

Examine this statement which has executed successfully:

  • A. Execution performance can be improved by using like instead of RLIKE.
  • B. Execution performance can be improved by, using a composite index with column description as the leftmost prefix column description.
  • C. Execution performance can be improved by adding an index on column description.
  • D. No index will improve statement performance.
  • E. The statement takes advantage of index description_idx.

Answer: A

Which two statements are true about AUTO_INCREMENT?

  • A. An AUTO_INCREMENT column must be indexed.
  • B. A server restart always resets the AUTO_INCREMENT value to largest value in the AUTO_INCREMENT column plus 1.
  • C. A table can have multiple AUTO_INCREMENT columns.
  • D. AUTO_INCREMENT values allocated to a transaction that is rolled back are not reused.
  • E. The decimal data type supports AUTO_INCREMENT.

Answer: B,E

Examine these statements issued from Session 1 which execute successfully:
Now, examine this statement issued from Session 2:
What is the outcome of the update statement in Session 2?

  • A. The transaction in Session 1 will be rolled back automatically.
  • B. The row will be updated immediately.
  • C. A deadlock will occur.
  • D. The statement will wait for the transaction in Session 1 to finish.

Answer: A

Which two differences exist between the timestamp and date time data types?

  • A. timestamp uses less storage space.
  • B. timestamp stores the interval between two dates.
  • C. timestamp converts the value based on the session time zone.
  • D. timestamp stores more decimal points in seconds
  • E. timestamp has larger range of values.

Answer: A,C

Examine this statement and output:
Which is true?

  • A. The underlying table's index on the Name column is not chosen because of low selectivity.
  • B. myview cannot be automatically indexed.
  • C. Column Name in myview can be indexed if the is_updatable attribute is true.
  • D. myview was defined with the temptable processing algorithm.

Answer: D


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