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

1. Suppose the key column of an EXPLAIN output is NULL. What does this mean?

A) There are no indexes considered useful for processing that query.
B) There are no indexes on the table you are querying.
C) There are no indexes available for use in the query.

2. Should all queries in the slow query log be optimized? (Choose two)

A) No; Queries that are run rarely are probably not worth the effort of optimization
B) Yes.
C) Yes, unless they depend on tables in the mysql database
D) No; Only the very slowest queries should be optimized
E) No; A query may have been entered into the slow query log because other, slow queries, prevented it from executing quickly

3. What is the effect of using WITH GRANT OPTION when executing the following statement?
GRANT SELECT, UPDATE, DELETE ON world.* TO 'joe'@'example.com' IDENTIFIED BY 'Sakila' WITH GRANT OPTION

A) The account 'joe'@'example.com' may grant any type of privilege on tables in the world database to other users
B) The account 'joe'@'example.com' may grant SELECT, UPDATE and DELETE privileges on tables in the world database to other users
C) The account 'joe'@'example.com' becomes an administrator account
D) Nothing; WITH GRANT OPTION is not a valid clause in GRANT commands.

4. In which ways can you set the query_cache_type option? (Choose three)

A) You can set it at runtime for the current connection with the following statement: SET SESSION query_cache_type=[0|1|2]
B) You can set it in the configuration file and restart the server.
C) You can set it at runtime for the entire server with the following statement: SET GLOBAL query_cache_type=[0|1|2]

5. Which of the following best describes why one should use VARCHAR rather than CHAR in InnoDB? (Choose two)

A) The optimizer always performs better with VARCHAR columns over CHAR columns.
B) Generally, there will be less disk I/O during processing.
C) The average amount of space used will be less.
D) VARCHAR columns provide better transaction support.

Solutions: