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

1. In the following query, the Population column is indexed: mysql> EXPLAIN SELECT Name -> FROM Country -> WHERE Code LIKE '%B%' AND Population > 10000 *************************** 1. row *************************** id: 1 select_type: SIMPLE table: Country type: ALL possible_keys: i_pop key: NULL key_len: NULL ref: NULL rows: 239 Extra: Using where
Which of the following best describes how to deal with the key value of the EXPLAIN output? (Choose two)

A) Use USE POSSIBLE_KEY
B) Use USE INDEX.
C) Use FORCE KEY
D) Use FORCE INDEX.

2. Suppose you have a server whose log files, data directory, and temporary files are distributed on different disks. How would this affect overall performance, compared to a server where all components reside on a single disk?

A) Performance would drop because the server would have to do extra work to read information off of the different disks.
B) You would expect a performance gain because the disk related activities would be split more evenly.
C) Performance would remain about the same, because the same amount of disk usage would be needed.

3. Consider the following:
mysql> SHOW STATUS LIKE 'Qcache%'; +-------------------------+--------+ | Variable_name | Value | +-------------------------+--------+ | Qcache_free_blocks | 87 | | Qcache_free_memory | 318442 | | Qcache_hits | 11224 | | Qcache_inserts | 19215 | | Qcache_lowmem_prunes | 437 | | Qcache_not_cached | 9155 | | Qcache_queries_in_cache | 240 | | Qcache_total_blocks | 924 | +-------------------------+--------+
What can be derived from this output?

A) There is a low utilization of the query cache.
B) There is a normal utilization of the query cache.
C) There is a high utilization of the query cache.

4. As an administrator, you attempt to create the account 'joe'@'example.com' with the following statement: GRANT SELECT, UPDATE, DELETE ON world.* TO 'joe'@'example.com' Which of the following best describe the effects of issuing this statement?

A) There is not enough information provided to determine the outcome of executing that statement.
B) Since no password is specified, the account is created with an empty password that must be changed by the user on first login
C) The account is not created, as you must always specify a password for new users
D) An account with no password is created, regardless of SQL modes. The password will not need to be set at a later time.
E) Depending on active SQL modes, you may be prevented from creating the account because no password is specified. Otherwise, an account with no password is created.

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

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

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