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

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

2. Which of the following best describe the purpose of the long_query_time variable?

A) It is used to see the time it took the last longest query to run.
B) It is used to tell the server when to log a query as slow.
C) It is used to tell the server after how many seconds to abort a query.
D) It is used to tell the server the total CPU seconds that are allotted to a client connection before it shut down.

3. Which of the following best describes what MASTER_LOG_FILE and MASTER_LOG_POS provides? (Choose two)

A) The position in the masters binary log in which to start replication.
B) The path of the log file.
C) The file to log replication actions to.
D) The masters binary log name used for replication.

4. Which of the following are important network factors for remote MySQL clients? (Choose two)

A) The type of routers used.
B) Latency.
C) Throughput speed.
D) Firewalls.

5. Consider the following:
mysql> DESC customers;
+--------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------+------------------+------+-----+---------+----------------+
| id | int(11) unsigned | NO | PRI | NULL | auto_increment |
| name_1 | char(20) | YES | MUL | NULL | |
| name_2 | varchar(20) | YES | | NULL | |
| name_3 | varchar(20) | YES | | NULL | |
| email | varchar(50) | YES | | NULL | |
+--------+------------------+------+-----+---------+----------------+
mysql> EXPLAIN SELECT * FROM customers WHERE name_1 = 'Johnny'
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: customers
type: ref
possible_keys: i_name_1_01,i_name_1_02
key: i_name_1_01
key_len: 21
ref: const
rows: 1
Extra: Using where
What can be assumed by looking at the key_len column?

A) The partial index is being used.
B) The full index is being used.
C) No indexes are being used.
D) The longest index is 21 characters long.

問題與答案：