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

NEW QUESTION # 26
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

NEW QUESTION # 27
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

NEW QUESTION # 28
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

NEW QUESTION # 29
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

NEW QUESTION # 30
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

NEW QUESTION # 31
......

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