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

1. 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) 2159, the average of both numbers
B) 4318, the sum of both numbers
C) 974881, the product of both numbers
D) 239, the number of rows in the first table
E) 4079, the number of rows in the second table

2. Consider the following EXPLAIN output. mysql> EXPLAIN SELECT Name FROM City WHERE Population > 8000000 *************************** 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 statements are true? (Choose three)

A) All 4079 rows of the table need to examined.
B) The Name column should be indexed.
C) The query cannot be optimized any better.
D) No index could be used to perform the query.
E) The Population column should be indexed.

3. Assuming that the account 'joe'@'%' does not already exist on the server, executing the statement
mysql> CREATE USER 'joe'@'%' IDENTIFIED BY 'sakila' will have the following consequences:

A) Nothing; there is no such command as CREATE USER
B) The account 'joe'@'%' is created on the server. Clients may connect to the server using this account and execute stored routines, but will not be able to access any databases or tables
C) The account 'joe'@'%' is created on the server. However, clients cannot connect using this account until further privileges have been assigned to the account.
D) The account 'joe'@'%' is created on the server. Clients may connect to the server using this account, but will not be able to access any databases, tables or stored routines

4. 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 helps eliminate possible data inconsistencies.
C) It removes redundant data.
D) It makes data access more flexible.
E) It makes backups more efficient.

5. What type of resource limitations may be placed on a user account with the GRANT statement? (Choose four)

A) The number of times per hour that an account is allowed to connect to the server
B) Resource limits can only be specified globally, not per-account
C) The maximum number of simultaneous connections an account can have
D) The number of updates per hour an account is allowed to issue
E) MySQL does not have provisions for limiting resource usage
F) The number of queries per hour an account is allowed to issue

Solutions: