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

1. 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'@'example.com' account is used for all authentication, as MySQL will always use the most specific hostname possible.
B) 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.
C) The 'joe'@'%' account is used for all authentication, as MySQL will always use the most general host name possible.
D) 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.

2. Which of the following best describes what the master.info file contains and how it is used? (Choose two)

A) When the slave restarts it looks for which master to use from this file.
B) It is used by an administrator to determine what slaves connect to the master, and other information about the master server.
C) It contains the values from the CHANGE MASTER statement.
D) It contains information about the master server, its slaves and its configuration.

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

4. Which of the following are general features of replication? (Choose three)

A) Allows the databases on one server to be made available on another server.
B) Provides complete redundancy and high availability at all times.
C) Multiple copies are available in case a server crashes or goes offline.
D) Can be used to distribute the load caused by servicing many clients.

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
Which of the following best describes the meaning of the "id" column in the output from EXPLAIN?

A) Which SELECT the row refers to.
B) It is just an incremental number to identify the rows from the output.
C) Which process it is running as.

Solutions: