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

1. Consider the following EXPLAIN output. mysql> EXPLAIN SELECT Name FROM City WHERE Population > 8000000 *************************** 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 where
Which of the following statements are true? (Choose three)

A) No index could be used to perform the query.
B) The Name column should be indexed.
C) All 4079 rows of the table need to examined.
D) The query cannot be optimized any better.
E) The Population column should be indexed.

2. What type of resource limitations may be placed on a user account with the GRANT statement? (Choose four)

A) The number of times per hour that an account is allowed to connect to the server
B) The number of queries per hour an account is allowed to issue
C) MySQL does not have provisions for limiting resource usage
D) The maximum number of simultaneous connections an account can have
E) Resource limits can only be specified globally, not per-account
F) The number of updates per hour an account is allowed to issue

3. 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.

4. When working with replication, why might you want to stop the I/O thread on the slave while keeping the SQL thread running?

A) So that remaining events can be processed while not receiving new events from the master.
B) So that no changes are made while making backups.
C) So that events for the slave do not get backlogged on the master.

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

Solutions: