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15个 MySQL 基础面试题,DBA 们准备好了吗?

程序员文章站 2022-03-04 15:37:09
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此前我们已经有发表过Linux 面试基础问答之一、二和三共3篇文章,获得读者的好评,,同时我们得到反馈,有些读者希望这种交互式学习方法能够做得更加灵活。心动不如行动,我们这就为您奉上 15个 MySQL 面试题。

【相关专题推荐:mysql面试题(2020)】

问题1:你如何确定 MySQL 是否处于运行状态?

答案: Debian 上运行命令 service mysql status,在RedHat 上运行命令 service mysqld status。然后看看输出即可。

root@localhost:/home/avi# service mysql status
/usr/bin/mysqladmin Ver 8.42 Distrib 5.1.72, for debian-linux-gnu on i486
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Server version 5.1.72-2
Protocol version 10
Connection Localhost via UNIX socket
UNIX socket /var/run/mysqld/mysqld.sock
Uptime: 1 hour 22 min 49 sec

Threads: 1 Questions: 112138 Slow queries: 1 Opens: 1485 Flush tables: 1 Open tables: 64 Queries per second avg: 22.567.

问题2:如何开启或停止 MySQL 服务?

答案:运行命令 service mysqld start 开启服务;运行命令 service mysqld stop 停止服务。

root@localhost:/home/avi# service mysql stop
Stopping MySQL database server: mysqld.
root@localhost:/home/avi# service mysql start
Starting MySQL database server: mysqld.
Checking for corrupt, not cleanly closed and upgrade needing tables..

问题3:如何通过 Shell 登入 MySQL?

答案:运行命令 mysql -u root -p

root@localhost:/home/avi# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 207
Server version: 5.1.72-2 (Debian)
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>

问题4:如何列出所有数据库?

答案:运行命令 show databases;

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| a1 |
| cloud |
| mysql |
| phpmyadmin |
| playsms |
| sisso |
| test |
| ukolovnik |
| wordpress |
+--------------------+

10 rows in set (0.14 sec)

问题5: 如何切换到某个数据库并在上面工作?

答案:运行命令 use database_name; 进入名为 database_name 的数据库。

mysql> use cloud;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql>

相关学习推荐:mysql教程