Uninstall and install the MySQL database

Uninstall and install the MySQL database

MySQL's completely uninstall

Because I do not know what the reason, there are two versions of the computer mysql the same time, so I decided to uninstall reinstall, but everyone says that MySQL is difficult to clean, so specifically to find a method to completely uninstall MySQL.

First, shortcuts win + r type regedit into the registry, find the HKEY_LOCAL_MACHINE \ SYSTEM \ ControlSet001 \ Services \ Eventlog \ Application \ MySQL folder deleted.

Delete HKEY_LOCAL_MACHINE \ SYSTEM \ ControlSet002 \ Services \ Eventlog \ Application \ MySQL folder.
Delete HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ Eventlog \ Application \ MySQL folder.
If there are two registry files, delete, not even the
then local service or Task Manager, turn off the MySQL:

Finally, delete the mysql installation position;

Some versions need to go to C: \ Program Files (x86) folder to find the MySQL folder (may be hidden), and then delete it.

Unfortunately, at that time I did not have time shots ....

You may experience permission issues when you delete a file, remember to change it permission, if there are, they entered into a delete a folder (I do not know why this can be deleted).

So far, congratulations you have completely deleted the MySQL.

MySQL8.0 installation tutorial

Although there are still a majority of people still using MySQL5.x version may be worried about copyright or other issues now, but I still have to install the latest version of MySQL8.0!

8.0 version of the installation and the previous versions, the following is a detailed process:

1. First, we enter Download MySQL official website: https: //dev.mysql.com/downloads/mysql/

   

   As a reminder, you can download the first one, do not go to the next second! Do not believe their own under the play -

2. After decompression, the new data folder, my.ini (yes, free installation)

   

3. Editing my.ini file, there are two need to amend its own

   [mysqld]
   # 设置3306端口
   port=3306
   # 设置mysql的安装目录
   basedir=D:\\mysql-8.0.17
   # 设置mysql数据库的数据的存放目录
   datadir=D:\\mysql-8.0.17\\data
   # 允许最大连接数
   max_connections=200
   # 允许连接失败的次数。这是为了防止有人从该主机试图攻击数据库系统
   max_connect_errors=10
   # 服务端使用的字符集默认为UTF8
   character-set-server=utf8
   # 创建新表时将使用的默认存储引擎
   default-storage-engine=INNODB
   [mysql]
   # 设置mysql客户端默认字符集
   default-character-set=utf8
   [client]
   # 设置mysql客户端连接服务端时默认使用的端口
   port=3306
   default-character-set=utf8

4. Configure the environment variables (not on Baidu)

5. Bin directory has an administrator interface to enter cmd, enter the mysql, followed by input:

   net stop mysql to stop the service

   mysqld --initialize --console initialized (here generates a random password for root form: root@localhost：这里是密码)

   mysqld.exe -install installation

   net start mysql start the service

   mysql -uroot -p password pasted above

6. Into mysql, began to change the password:

   alter user user() identified by 'password' 

   Change the current user's password

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You can collect spare oh ~