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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
Which of the following best describes the meaning of the "id" column in the output from EXPLAIN?

A) Which process it is running as.
B) It is just an incremental number to identify the rows from the output.
C) Which SELECT the row refers to.

2. Does the ordering of tables shown in an EXPLAIN output have any significance? Why?

A) No, it sorts them alphabetically.
B) No, the order is determined by the order in which tables are specified in the statement being EXPLAINed.
C) Yes, it sorts by the most optimized to the least optimized.
D) Yes, it determines the table from which data will read first.

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

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

4. Which key buffers are available for MyISAM tables?

A) An optional table-specific key buffer that can be assigned to single MyISAM tables.
B) An optional column-specific key buffer that can be assigned to a single column of a MyISAM table.
C) A global key buffer that keeps index information for all MyISAM tables.

5. Which factors can be considered in a stored routine to allow or disallow access or modification of data? (Choose two)

A) The CPU load of the system
B) The number of current connections
C) The current date and time
D) The identity of the client user

Solutions: