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

1. What should you do in order to enhance the security of a standard MySQL installation on Unixtype operating systems?

A) Nothing; by default the security level of a MySQL installation is very high
B) Disable the mysql_access program
C) Run the mysql_secure_installation script

2. When working with replication, why might you want to stop the SQL thread on the slave while keeping the I/O thread running? (Choose two)

A) So that no changes are made while making backups.
B) So that remaining events can be processed while not receiving new events from the master.
C) So that events for the slave do not get backlogged on the master.

3. Consider the following:
+----+-----------------+--------------+
| id | PartName | Location |
+----+-----------------+--------------+
| 1 | 40GB Hard Drive | Jacksonville |
| 2 | 1GB DDR | Atlanta |
| 3 | Keyboard | San Jose |
| 4 | Monitor | Harrisburg |
| 5 | USB Drive | Miami |
| 6 | DVD/R | Jacksonville |
+----+-----------------+--------------+
Which of the following best describes why this table should be split into a part and location table?

A) This table should not be split as it is already in third normal form.
B) Because it has redundant location values.
C) Because it has multiple repeating groups in each row.

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
What does the possible_keys column in this output denote?

A) Whether you are using any indexes in your query.
B) Whether there are any indexes on the table(s) you are querying.
C) If there are any indexes you may be able to use.
D) If it is possible for you to include any indexes in your query.

5. Consider the following EXPLAIN of a simple Join:
mysql> EXPLAIN SELECT CountryList.Name, CityList.Name, CityList.Population
-> FROM CountryList JOIN CityList ON CountryList.Code = CityList.Country
-> WHERE CityList.Population > 8000000 *************************** 1. row *************************** id: 1 select_type: SIMPLE table: CountryList type: ALL possible_keys: NULL key: NULL key_len: NULL ref: NULL rows: 239 Extra: *************************** 2. row *************************** id: 1 select_type: SIMPLE table: CityList type: ALL possible_keys: NULL key: NULL key_len: NULL ref: NULL rows: 4079 Extra:
Using where How many rows need to be examined to perform the join?

A) 974881, the product of both numbers
B) 4318, the sum of both numbers
C) 4079, the number of rows in the second table
D) 239, the number of rows in the first table
E) 2159, the average of both numbers

Solutions: