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

1. Which of the following statements about the slow query log is true?

A) The slow query log may not always contain just slow queries.
B) The slow query log always logs more than just slow queries.
C) The slow query log will always contain just slow queries.

2. Given the result of the following query:
mysql> SELECT Host, User FROM mysql.user WHERE User='joe';
+-------------+------+
| Host | User |
+-------------+------+ | % | joe |
| example.com | joe |
+-------------+------+
2 rows in set (0.00 sec)
A client connection is established with the username joe from the host example.com. Assuming that the login is successful, which of the entries shown in the mysql.user table are used to authenticate the client connection for subsequent query executions, and why?

A) The 'joe'@'%' account is used for all authentication, as MySQL will always use the most general host name possible.
B) The 'joe'@'example.com' account is used for all authentication, as MySQL will always use the most specific hostname possible.
C) For every query, the 'joe'@'%' account is checked first. If that does not have the proper permissions, 'joe'@'example.com' will be used as MySQL will check all relevant accounts, with the most general hostname first.
D) For every query, the 'joe'@'example.com' account is checked first. If that does not have the proper permissions, 'joe'@'%' will be used as MySQL will check all relevant accounts, with the most specific hostname first.

3. Which of the following are requirements for running more than one MySQL server on the same machine? (Choose four)

A) There must be more than one processor on the machine.
B) Each server must run on a different disk.
C) InnoDB tablespace files must be separate between servers.
D) Each server must share the same error log.
E) Each server must have its own log files.
F) On Windows each server that runs as a service must have a different service name.
G) Each server must have its own network interfaces.

4. With replication, what on the master is used to send commands to the slave?

A) The binary log.
B) The SQL Thread.
C) The relay log.

5. Consider the following: mysql> EXPLAIN SELECT * FROM City WHERE CountryCode = 'USA' *************************** 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
What does it mean that the possible_keys column value is NULL?

A) You are not making use of any available indexes in your query.
B) No index exists for the table you are querying.
C) No index is considered available for this query.

Solutions: