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

1. Which of the following best describes the purpose of the join buffer, and when should you increase the size of it? (Choose three)

A) The join buffer is global and can only be changed by restarting the server.
B) The join buffer is used to process joins.
C) The join buffer is used to process sorts when complex joins are being performed.
D) The join buffer is set per-connection.
E) The value should be increased if the client has the tendency to perform complex joins.
F) The value should be increased if the client performs a lot of SELECT operations.

2. It is important to analyze queries that involve joins with EXPLAIN because...

A) Joins are more prone to mistakes.
B) Joins have the potential to cause more server processing if not defined correctly.
C) Using EXPLAIN before executing the query helps the server prepare the statements used.

3. How can the SHOW PROCESSLIST command be helpful when optimizing queries?

A) It shows the percentage of processing power that each query is using on a server.
B) It shows how the server processes a query.
C) It shows if a query is using an index or not.
D) If checked periodically, it can reveal a queries that causes other queries to hang.

4. Which of the following best describes the order in which MySQL considers host names and user names when a client attempts connection?

A) Hostnames then usernames
B) Both hostnames and usernames are checked concurrently.
C) Usernames then hostnames

5. Which of the following would be considered a good candidate table for compression?

A) All MyISAM tables are good candidates for compression.
B) A large table, such as those used for data warehousing.
C) A table with data that needs only few updates in the future.
D) A table with data that will not be updated in the future.

Solutions: