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MYSQL MySQL 5.0 Database Administrator Certified Professional Exam, Part II Sample Questions:

1. Consider the following: mysql> EXPLAIN SELECT Name FROM Country WHERE Population BETWEEN 1 AND 10000 *************************** 1. row *************************** id: 1 select_type: SIMPLE table: Country type: range possible_keys: i_pop key: i_pop key_len: 4 ref: NULL rows: 10 Extra: Using where
What is the meaning of the range value of the type column?

A) The optimizer has determined that only data from the very beginning or the very end of the table is needed
B) There is a range of indexes that can be used.
C) The type of index uses the range algorithm.
D) The index is used to select rows that fall between a range of index values.

2. Consider the following:
mysql> EXPLAIN SELECT Name FROM City WHERE CountryCode = (SELECT Code FROM
Country
WHERE Name = 'United States')
*************************** 1. row ***************************
id: 1
select_type: PRIMARY
table: City
type: ALL
possible_keys: NULL
key: NULL
key_len: NULL
ref: NULL
rows: 4079
Extra: Using where
Which of the following best describes the meaning of the value of the select_type column?

A) It is the first SELECT in a subquery.
B) The outer select is the SELECT referred to in the output row.
C) The inner select is the SELECT referred to in the output row.
D) The query has a subquery.

3. Should all queries in the slow query log be optimized? (Choose two)

A) No; Only the very slowest queries should be optimized
B) Yes, unless they depend on tables in the mysql database
C) No; A query may have been entered into the slow query log because other, slow queries, prevented it from executing quickly
D) Yes.
E) No; Queries that are run rarely are probably not worth the effort of optimization

4. Which of the following best describes when it might be advantageous to split a dynamic-row table into dynamic-row and fixed-row tables?

A) When the table contains both fixed and variable length columns, but the majority of queries on it access the fixed length columns.
B) When the table contains both fixed and variable length columns, but the majority of queries on it access the variable length columns.
C) When the table contains both fixed and variable length columns, and the majority of queries access both the variable and fixed length columns.

5. The type of file system you chose may affect MySQL use and/or performance with regard to... (Choose three)

A) Size limits of files.
B) Time to recover from a crash.
C) The type of storage engines that can be used.
D) Table opening time.
E) The number of users MySQL can handle.

Solutions: