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

1. Which of the following best describes when it might be advantageous to split a dynamic-row table into dynamic-row and fixed-row tables?

A) When the table contains both fixed and variable length columns, but the majority of queries on it access the fixed length columns.
B) When the table contains both fixed and variable length columns, but the majority of queries on it access the variable length columns.
C) When the table contains both fixed and variable length columns, and the majority of queries access both the variable and fixed length columns.

2. Which of the following optimizations could be made based on data collected in the slow query log? (Choose four)

A) Change the storage engines in use.
B) Tune server parameters.
C) Rewrite queries to perform more efficiently.
D) Make changes to the network infrastructure.
E) Normalize data or add indexes to the tables that the queries use.

3. 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.

4. Which of the following statements about the slow query log is true?

A) The slow query log always logs more than just slow queries.
B) The slow query log may not always contain just slow queries.
C) The slow query log will always contain just slow queries.

5. Consider the following EXPLAIN output. mysql> EXPLAIN SELECT Name FROM City WHERE Population > 8000000 *************************** 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 statements are true? (Choose three)

A) No index could be used to perform the query.
B) The Population column should be indexed.
C) The query cannot be optimized any better.
D) All 4079 rows of the table need to examined.
E) The Name column should be indexed.

Solutions: