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

1. You have been granted SELECT, INSERT and DELETE privileges on the table city in the world database. You log in, and exercise all your privileges without any problems. While you are still connected and doing work, the administrator removes your DELETE privileges and informs you by mail that you can no longer delete from table city. Being skeptical, you decided to test your privileges and realize that you still have them all. What is are the most likely causes of this? (Choose two)

A) The administrator forgot to revoke your SELECT privilege
B) The administrator did not execute FLUSH PRIVILEGES
C) The administrator removed the DELETE privilege by performing an UPDATE directly on the mysql.table_priv table
D) The administrator forgot to revoke your UPDATE privilege

2. Which of the following would be considered a good candidate table for compression?

A) A large table, such as those used for data warehousing.
B) A table with data that needs only few updates in the future.
C) All MyISAM tables are good candidates for compression.
D) A table with data that will not be updated in the future.

3. 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'@'%' 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.
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'@'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.

4. The account 'ulf'@'localhost' has previously been created with the statement
GRANT ALL PRIVILEGES ON *.* TO 'ulf'@'localhost' IDENTIFIED BY 'w01f' This account should no longer be used, so you issue the following command:
REVOKE ALL PRIVILEGES ON *.* FROM 'ulf'@'localhost'
After executing this statement, you inspect the server and find that no clients are connected using that account. However, the next day you notice that the account 'ulf'@'localhost' is indeed connected to the server. Why is it still possible for the account 'ulf'@'localhost' to connect to the server?

A) The REVOKE statement used does not remove the USAGE privilege from the account, allowing new connections with that account.
B) The ON *.* clause should not be specified when disabling an account
C) The REVOKE command was not followed by a FLUSH PRIVILEGES command, so the account was never actually disabled
D) Specifying GRANT ALL PRIVILEGES ON *.* effectively created an administrator account, which cannot be disabled through the REVOKE statement

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

Solutions: