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

1. Suppose you have a server whose log files, data directory, and temporary files are distributed on different disks. How would this affect overall performance, compared to a server where all components reside on a single disk?

A) You would expect a performance gain because the disk related activities would be split more evenly.
B) Performance would drop because the server would have to do extra work to read information off of the different disks.
C) Performance would remain about the same, because the same amount of disk usage would be needed.

2. What is the effect of using WITH GRANT OPTION when executing the following statement?
GRANT SELECT, UPDATE, DELETE ON world.* TO 'joe'@'example.com' IDENTIFIED BY 'Sakila' WITH GRANT OPTION

A) Nothing; WITH GRANT OPTION is not a valid clause in GRANT commands.
B) The account 'joe'@'example.com' may grant SELECT, UPDATE and DELETE privileges on tables in the world database to other users
C) The account 'joe'@'example.com' may grant any type of privilege on tables in the world database to other users
D) The account 'joe'@'example.com' becomes an administrator account

3. Consider the following:
mysql> EXPLAIN SELECT * FROM City WHERE Name = 'Jacksonville' AND CountryCode =
'USA'
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: City
type: ref
possible_keys: name_country_index
key: name_country_index
key_len: 13
ref: const,const
rows: 1
Extra: Using where
Which of thefollowing best describes the meaning of the value for the key_len column?

A) It shows how big the indexes are.
B) It shows how many bytes will be used from index rows.
C) It shows how many columns are examined.
D) It shows how many results will be returned.

4. Which of the following best describes what mysqldumpslow does and how to use it? (Choose two)

A) Shell> mysqldumpslow < log_name
B) It shows a summary of the slow log contents.
C) Shell> mysqldumpslow log_name
D) It dumps the contents of the slow log into a readable format.

5. Consider the following: mysql> EXPLAIN SELECT DISTINCT City.id,City.name -> FROM City,Country -> WHERE Country.Name IN ('United States','Canada','Mexico') -> AND City.CountryCode=Country.Code -> ORDER BY name *************************** 1. row *************************** id: 1 select_type: SIMPLE table: City type: ALL possible_keys: NULL key: NULL key_len: NULL ref: NULL rows: 4079 Extra: Using temporary; Using filesort *************************** 2. row *************************** id: 1 select_type: SIMPLE table: Country type: eq_ref possible_keys: PRIMARY key: PRIMARY
key_len: 3
ref: world.City.CountryCode
rows: 1
Extra: Using where;
Distinct
Which of the following best describes the meaning of the values in the ref columns?

A) No index columns are used to choose rows from Country and the City.CountryCode column is used to reference rows in the City table.
B) No indexed columns are used to choose rows from City and the City.CountryCode column is used to reference rows in the Country table.
C) City.CountryCode is used to sort what rows are returned from the City table.

Solutions: