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

1. Which of the following best describe the purpose of the long_query_time variable?

A) It is used to tell the server after how many seconds to abort a query.
B) It is used to tell the server the total CPU seconds that are allotted to a client connection before it shut down.
C) It is used to see the time it took the last longest query to run.
D) It is used to tell the server when to log a query as slow.

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'@'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) 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) The 'joe'@'%' account is used for all authentication, as MySQL will always use the most general host name possible.

3. Doing SELECT COUNT(*) queries in InnoDB is efficient...

A) Yes, if the table has any indexes.
B) Yes, because InnoDB stores a row count in the table.
C) No, because the table must be sorted.
D) No, because InnoDB does not store a row count in the table.

4. Which of the following best describes the relationship between MAX_ROWS, AVG_ROW_LENGTH and the max table size?

A) Specifying MAX_ROWS and AVG_ROW_LENGTH doesn't prevent MySQL from growing the table beyond that limit.
B) MAX_ROWS + AVG_ROW_LENGTH tells MySQL to not let the table grow past that size.
C) Specifying MAX_ROWS and AVG_ROW_LENGTH will prevent MySQL from growing the table beyond that limit.
D) MAX_ROWS * AVG_ROW_LENGTH tells MySQL how large you expect the table to grow to.

5. Which of the following are reasons you would want to normalize your data? (Choose three)

A) It is the only way to make your data internationalized.
B) It removes redundant data.
C) It helps eliminate possible data inconsistencies.
D) It makes data access more flexible.
E) It makes backups more efficient.

Solutions: