同一台win系统下安装多个版本的mysql

window10系统下同时安装多个版本的Mysql

测试环境：window10，已经安装了mysql5.5，继续安装mysql8.0或者mysql5.7

两个mysql的安装都是自定义目录，我目录是D:\mysql5.5和D:\mysql8.0

5.5已经安装好了，默认端口是3306，所以第二个需要改一下端口，这里改为3307

首先，需要先修改mysql8.0目录下的配置文件，建立文件,my.ini，在里面配置

 

   # For advice on how to change settings please see

1. # http://dev.mysql.com/doc/refman/8.0/en/server-configuration-defaults.html

2. # *** DO NOT EDIT THIS FILE. It's a template which will be copied to the

3. # *** default location during install, and will be replaced if you

4. # *** upgrade to a newer version of MySQL.

5. [mysqld]

6. # Remove leading # and set to the amount of RAM for the most important data

7. # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.

8. innodb_buffer_pool_size = 128M

9. # Remove leading # to turn on a very important data integrity option: logging

10. # changes to the binary log between backups.

11. # log_bin

12. # These are commonly set, remove the # and set as required.

13. basedir = D:\mysql8.0\mysqld.exe

14. datadir = D:\mysql8.0\data

15. port = 3307

16. server_id = 1

17. # Remove leading # to set options mainly useful for reporting servers.

18. # The server defaults are faster for transactions and fast SELECTs.

19. # Adjust sizes as needed, experiment to find the optimal values.

20. join_buffer_size = 128M

21. sort_buffer_size = 2M

22. read_rnd_buffer_size = 2M

23. sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

然后用管理员方式打开cmd，找到mysql8.0的bin目录下

输入mysqld --defaults-file=D:\mysql8.0\my.ini --initialize --console初始化一下，执行完这个命令会发现多了一个data文件夹

注意别忘记这个密码了，先复制下来。

然后执行mysqld install MySQL3  --defaults-file="D:\mysql8.0\my.ini"   然后返回成功。

接着win+r打开compmgmt.msc管理，找到MySQL3(自己定义的名字)启动就行了。

启动后使用navicat连接

报  

your password has expired   密码过期了

打开管理员cmd，进入安装mysql的目录下边，bin目录，输入

mysql -uroot -p -P3307    （自己设置的端口）

然后设置密码   set password = password('root');然后发现可以成功连接

假如你还是忘记了这个密码，看这里 mysql8忘记密码怎么办？