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

1. Given the following MyISAM table structure:
mysql> desc city;
+-------------+----------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+----------+------+-----+---------+----------------+
| ID | int(11) | | PRI | NULL | auto_increment |
| Name | char(35) | | | | |
| CountryCode | char(3) | | | | |
| District | char(20) | | | | |
| Population | int(11) | | MUL | 0 | |
+-------------+----------+------+-----+---------+----------------+
And the following SQL statement: SELECT Population FROM city WHERE Population = 10000
ORDER BY Population LIMIT 5; which of the following statements best describes how MySQL
optimizer executes the query?

A) The optimizer uses the index on the Population column to search, filter and sort the Population column, then returns 5 records to the client. The optimizer does not need to read the data rows, and can return values from the index only, because the index contains just integer values that form a leftmost prefix for the key.
B) The optimizer will never read data from disk, since MySQL caches both data and index in the key buffer.
C) The optimizer uses the index on the Population column to search, filter and sort the Population column, and returns 5 records to the client. The optimizer does not need to read the data rows, and can return values from the index only because only those columns where specified in the SELECT statement.
D) The optimizer uses the primary key column ID to read the index values, then uses the index on Population to filter the results. The optimizer will always choose to use a unique index first, then use a secondary index if available.
E) The optimizer uses the index on the Population column to search and filter the WHERE clause. A temporary table is used to perform a filesort on the results, and then only 5 records are returned to the client.

2. What kind of replication is supported by the MySQL server?

A) Master to slave replication
B) Multiple-master replication
C) Single file based clustering
D) MySQL doesn't support replication

3. Consider the following:
mysql> SELECT * FROM CountryLanguages;
+----+---------------+-------------+----------+
| ID | CountryName | CountryCode | Language |
+----+---------------+-------------+---------+
| 1 | United States | USA | English |
| 2 | United States | USA | Spanish |
| 3 | Mexico | MEX | Spanish |
| 4 | Canada | CAN | English |
| 5 | Canada | CAN | French |
+----+---------------+-------------+----------+
Which of the following describe how this table would look correctly normalized?

A) Table Countries: CountryCode, CountryName, LanguageID
Table Languages: LanguageID, Language
B) Table Countries: CountryCode, CountryName
Table Languages: LanguageID, CountryCode Table CountryLanguage: LanguageID,
CountryCode,
Language
C) Table Countries: CountryCode, CountryName
Table Languages: LanguageID, CountryCode, Language
D) Table Countries: CountryCode, CountryName Table Languages: LanguageID, Language
Table CountryLanguage: CountryCode, LanguageID

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

5. 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) 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.
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) The 'joe'@'%' account is used for all authentication, as MySQL will always use the most general host name possible.

Solutions: