MYSQL MYSQL-Certifications 1Z0-874

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

1. Which of the following optimizations could be made based on data collected in the slow query log? (Choose four)

A) Rewrite queries to perform more efficiently.
B) Normalize data or add indexes to the tables that the queries use.
C) Tune server parameters.
D) Change the storage engines in use.
E) Make changes to the network infrastructure.

2. Is it possible to force the join order in a query, and if so how?

A) Yes it is possible simply list the tables in the desired order in your SELECT.
B) Yes it is possible use SELECT FORCE_JOIN rather than just SELECT, then list the tables in the desired order.
C) Yes it is possible, use SELECT STRAIGHT_JOIN rather than just SELECT, the list the tables in the desired order.
D) No, it is not possible.

3. Which of the following best describes the purpose of the record buffer (as controlled through the read_buffer_size variable), and how it is set? (Choose two)

A) The record buffer is global and is only set by restarting the server.
B) The record buffer is set per connection.
C) The record buffer is used for operations such as ORDER BY or GROUP BY.
D) The record buffer is used to perform sequential table scans, reducing the number of reads from disk

4. Which of the following statements are true regarding the structure of grant tables in new distributions?

A) They remain the same for backwards compatibility.
B) They change with every upgrade.
C) They are often changed.

5. Consider the following:
mysql> DESC customers;
+--------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------+------------------+------+-----+---------+----------------+
| id | int(11) unsigned | NO | PRI | NULL | auto_increment |
| name_1 | char(20) | YES | MUL | NULL | |
| name_2 | varchar(20) | YES | | NULL | |
| name_3 | varchar(20) | YES | | NULL | |
| email | varchar(50) | YES | | NULL | |
+--------+------------------+------+-----+---------+----------------+
mysql> EXPLAIN SELECT * FROM customers WHERE name_1 = 'Johnny'
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: customers
type: ref
possible_keys: i_name_1_01,i_name_1_02
key: i_name_1_01
key_len: 21
ref: const
rows: 1
Extra: Using where
What can be assumed by looking at the key_len column?

A) The longest index is 21 characters long.
B) The partial index is being used.
C) No indexes are being used.
D) The full index is being used.

Solutions: