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

1. Which of the following correctly describe the purpose of the sort buffer, and when it is set? (Choose two)

A) The sort buffer is used to control the maximum number of sorts the server can perform simultaneously.
B) The size of the sort buffer is set per-connection.
C) The sort buffer is used for operations such as ORDER BY or GROUP BY which can speedup sorting operations.
D) The sort buffer is global and the size can only be set by restarting the server.

2. Given the following MyISAM table structure:
mysql> desc city;
+-------------+----------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+----------+------+-----+---------+----------------+
| ID | int(11) | | PRI | NULL | auto_increment |
| Name | char(35) | | | | |
| CountryCode | char(3) | | | | |
| District | char(20) | | | | |
| Population | int(11) | | MUL | 0 | |
+-------------+----------+------+-----+---------+----------------+
And the following SQL statement: SELECT Population FROM city WHERE Population = 10000
ORDER BY Population LIMIT 5; which of the following statements best describes how MySQL
optimizer executes the query?

A) The optimizer uses the index on the Population column to search and filter the WHERE clause. A temporary table is used to perform a filesort on the results, and then only 5 records are returned to the client.
B) The optimizer uses the index on the Population column to search, filter and sort the Population column, then returns 5 records to the client. The optimizer does not need to read the data rows, and can return values from the index only, because the index contains just integer values that form a leftmost prefix for the key.
C) The optimizer uses the index on the Population column to search, filter and sort the Population column, and returns 5 records to the client. The optimizer does not need to read the data rows, and can return values from the index only because only those columns where specified in the SELECT statement.
D) The optimizer will never read data from disk, since MySQL caches both data and index in the key buffer.
E) The optimizer uses the primary key column ID to read the index values, then uses the index on Population to filter the results. The optimizer will always choose to use a unique index first, then use a secondary index if available.

3. Doing SELECT COUNT(*) queries in InnoDB is efficient...

A) No, because the table must be sorted.
B) Yes, because InnoDB stores a row count in the table.
C) Yes, if the table has any indexes.
D) No, because InnoDB does not store a row count in the table.

4. The user 'joe' connecting from the host example.com has full access to all databases on the server:
mysql> SHOW GRANTS FOR 'joe'@'example.com';
+--------------------------------------------------+
| Grants for [email protected] |
+----------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'joe'@'example.com' |
+----------------------------------------------------+
1 row in set (0.00 sec)
You need to restrict the user from accessing the mysql database. Will the following statement do this?
REVOKE ALL PRIVILEGES ON mysql.* FROM 'joe'@'example.com'

A) Yes
B) The answer cannot be determined from the information provided.
C) No

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) All 4079 rows of the table need to examined.
C) The Population column should be indexed.
D) The query cannot be optimized any better.
E) The Name column should be indexed.

Solutions: