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

1. Suppose the key column of an EXPLAIN output is NULL. What does this mean?

A) There are no indexes considered useful for processing that query.
B) There are no indexes available for use in the query.
C) There are no indexes on the table you are querying.

2. Which of the following best describe what could cause low utilization of query cache?

A) The query cache size is too small.
B) The server might be trying to cache queries when it really isn't worth it.
C) The Qcache_priority variable is set too small.
D) The CACHE_QUERY keyword is not being used.

3. Can you have several MySQL servers running on the same computer, using the same InnoDB
tablespace files?

A) Yes, provided their permissions are set to read-only
B) Yes, always
C) No

4. Consider the following:
mysql> EXPLAIN SELECT * FROM City WHERE Name = 'Jacksonville' AND CountryCode =
'USA'
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: City
type: ref
possible_keys: name_country_index
key: name_country_index
key_len: 13
ref: const,const
rows: 1
Extra: Using where
Which of thefollowing best describes the meaning of the value for the key_len column?

A) It shows how big the indexes are.
B) It shows how many results will be returned.
C) It shows how many bytes will be used from index rows.
D) It shows how many columns are examined.

5. For which of the following objects can privileges be specified? (Choose four)

A) database
B) table
C) host
D) global
E) row
F) column

Solutions: