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

1. Which of the following best describes why InnoDB tables should always have primary keys and why they should be short?

A) Because InnoDB stores pointers in a log to all the primary keys and shorter keys make this log smaller.
B) Because InnoDB uses primary keys to locate tables, and shorter keys make quicker lookups.
C) Because InnoDB uses primary keys to locate table rows, and shorter keys make quicker lookups.

2. Which of the following statements are true regarding the slow query log? (Choose four)

A) The slow query log is always enabled.
B) The slow query log contains queries that don't utilize any index.
C) You can use the SHOW SLOW QUERIES statement to display all entries in the slow queries log.
D) The slow query log will contain queries that take more than 10 seconds.
E) You can use the mysqldumpslow command line tool to summarize the content of the slow query log.
F) The slow query log can be switched on with the log_slow_queries option.
G) The slow query log will contain queries that take more seconds than configured in the long_query_time option.
H) To have the slow query log contain queries that don't utilize any index, the log-queriesnotusingindexes option needs to be set.

3. Which of the following statements are required to create a key cache of 4 MB, assign the
MyISAM table world.City to it and preload the index?

A) Mysql> CREATE CACHE FOR world.City SIZE = 4194304;
B) It is not possible to create a key cache for a specific MyISAM table, only the global key cache can be used.
C) Mysql> SET GLOBAL city_cache.key_buffer_size = 4194304; mysql> CACHE INDEX world.City IN city_cache; mysql> LOAD INDEX INTO CACHE world.City;
D) Mysql> ALTER TABLE world.city KEY_CACHE = 4194304;

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

5. Which of the following best describes the relationship between MAX_ROWS, AVG_ROW_LENGTH and the max table size?

A) Specifying MAX_ROWS and AVG_ROW_LENGTH doesn't prevent MySQL from growing the table beyond that limit.
B) Specifying MAX_ROWS and AVG_ROW_LENGTH will prevent MySQL from growing the table beyond that limit.
C) MAX_ROWS * AVG_ROW_LENGTH tells MySQL how large you expect the table to grow to.
D) MAX_ROWS + AVG_ROW_LENGTH tells MySQL to not let the table grow past that size.

Solutions: