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

1. 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 it mean that the possible_keys column value is NULL?

A) You are not making use of any available indexes in your query.
B) No index exists for the table you are querying.
C) No index is considered available for this query.

2. How can the strict SQL mode provide added security? (Choose three)

A) By restricting out of range values.
B) By restricting incorrect data types.
C) By rejecting actions that do not have values for columns without a default.
D) By limiting the operations that the server can perform.

3. With replication, what on the master is used to send commands to the slave?

A) The binary log.
B) The SQL Thread.
C) The relay log.

4. Is it possible to tell the MySQL server to throw an error on illegal dates rather than converting it to zero-date or legal dates?

A) No, it has to be done programmatically.
B) No, all illegal date are converted regardless of any setting.
C) Yes, by updating a system variable.
D) Yes, there is a SQL mode that exists for that.

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

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

Solutions: