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MYSQL 1Z0-874 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| MySQL Architecture and Core Components | |
| Storage Engines and Table Management | |
| Backup, Restore, and Recovery | |
| Performance Tuning and Optimization | |
| Monitoring, Maintenance, and Troubleshooting | |
| Installation, Configuration, and Server Setup | |
| Replication and High Availability | |
| User Management and Security |
MYSQL MySQL 5.0 Database Administrator Certified Professional Exam, Part II Sample Questions:
Given the result of the following query:
mysql> SELECT Host, User FROM mysql.user WHERE User='joe';
+-------------+------+
| Host | User |
+-------------+------+ | % | joe |
| example.com | joe |
+-------------+------+
2 rows in set (0.00 sec)
A client connection is established with the username joe from the host example.com. Assuming that the login is successful, which of the entries shown in the mysql.user table are used to authenticate the client connection for subsequent query executions, and why?
- A. The 'joe'@'example.com' account is used for all authentication, as MySQL will always use the most specific hostname possible.
- B. The 'joe'@'%' account is used for all authentication, as MySQL will always use the most general host name possible.
- C. For every query, the 'joe'@'%' account is checked first. If that does not have the proper permissions, 'joe'@'example.com' will be used as MySQL will check all relevant accounts, with the most general hostname first.
- D. For every query, the 'joe'@'example.com' account is checked first. If that does not have the proper permissions, 'joe'@'%' will be used as MySQL will check all relevant accounts, with the most specific hostname first.
Correct Answer: A 🗳️
Assuming that the account 'joe'@'%' does not already exist on the server, executing the statement
mysql> CREATE USER 'joe'@'%' IDENTIFIED BY 'sakila' will have the following consequences:
- A. The account 'joe'@'%' is created on the server. However, clients cannot connect using this account until further privileges have been assigned to the account.
- B. The account 'joe'@'%' is created on the server. Clients may connect to the server using this account and execute stored routines, but will not be able to access any databases or tables
- C. The account 'joe'@'%' is created on the server. Clients may connect to the server using this account, but will not be able to access any databases, tables or stored routines
- D. Nothing; there is no such command as CREATE USER
Correct Answer: C 🗳️
Which key buffers are available for MyISAM tables?
- A. A global key buffer that keeps index information for all MyISAM tables.
- B. An optional table-specific key buffer that can be assigned to single MyISAM tables.
- C. An optional column-specific key buffer that can be assigned to a single column of a MyISAM table.
Correct Answer: A 🗳️
Which of the following best describes how the relay log works?
- A. It records the times when the slave connects to the master.
- B. When a slave receives a change from the master, it is recorded in the relay log first and processed later.
- C. When a slave receives a change from the master, it is processed first and then recorded in the relay log.
Correct Answer: B 🗳️
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 longest index is 21 characters long.
- B. No indexes are being used.
- C. The full index is being used.
- D. The partial index is being used.
Correct Answer: C 🗳️
