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MYSQL 1Z0-874 Exam Syllabus Topics:

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

1. Consider the following: mysql> EXPLAIN SELECT Name FROM Country WHERE Population BETWEEN 1 AND 10000 *************************** 1. row *************************** id: 1 select_type: SIMPLE table: Country type: range possible_keys: i_pop key: i_pop key_len: 4 ref: NULL rows: 10 Extra: Using where
What is the meaning of the range value of the type column?

A) There is a range of indexes that can be used.
B) The type of index uses the range algorithm.
C) The index is used to select rows that fall between a range of index values.
D) The optimizer has determined that only data from the very beginning or the very end of the table is needed

2. Consider the following: mysql> EXPLAIN SELECT DISTINCT City.id,City.name -> FROM City,Country -> WHERE Country.Name IN ('United States','Canada','Mexico') -> AND City.CountryCode=Country.Code -> ORDER BY name *************************** 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 temporary; Using filesort *************************** 2. row *************************** id: 1 select_type: SIMPLE table: Country type: eq_ref possible_keys: PRIMARY key: PRIMARY
key_len: 3
ref: world.City.CountryCode
rows: 1
Extra: Using where;
Distinct
Which of the following best describes the meaning of the values in the ref columns?

A) No indexed columns are used to choose rows from City and the City.CountryCode column is used to reference rows in the Country table.
B) City.CountryCode is used to sort what rows are returned from the City table.
C) No index columns are used to choose rows from Country and the City.CountryCode column is used to reference rows in the City table.

3. When performing diagnostic functions on a server should excessive start and stop messages be looked for in the error log, and why?

A) No, start and stop messages are of no relevance to diagnostics.
B) Yes, because they can indicate that there is something causing the server to restart unexpectedly and not due to normal startup and shutdown.
C) No, because they will not provide any information as to what is wrong.
D) Yes, because there is a bug in mysqld that can cause multiple start and stop messages to be inserted in the log.

4. Which of the following describe the correct single-statement syntax for allowing the existing user 'kofi'@'%' to perform SELECT, INSERT, DELETE and UPDATE actions on all tables in the world database?

A) GRANT SELECT, INSERT, DELETE, UPDATE ON world.* TO 'kofi'@'%';
B) GRANT (SELECT, INSERT, DELETE, UPDATE) ON world.* TO 'kofi'@'%'
C) GRANT SELECT INSERT DELETE UPDATE ON world.* TO 'kofi'@'%'
D) Unless using ALL PRIVILEGES, it is not possible to assign more than one type of privilege at any one time.
E) GRANT world.* (SELECT, INSERT, DELETE, UPDATE) TO 'kofi'@'%'

5. When working with replication, why might you want to stop the I/O thread on the slave while keeping the SQL thread running?

A) So that no changes are made while making backups.
B) So that remaining events can be processed while not receiving new events from the master.
C) So that events for the slave do not get backlogged on the master.

Solutions: