Windows下MySQL-5.7.20绿色免安装版配置与使用
MySQL-5.7.20绿解压缩版（免安装）安装配置教程

下载地址
https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.20-winx64.zip
https://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.20-winx64.zip

1、添加环境变量
新建系统变量 MYSQL_HOME ，并配置变量值为 C:\mysql-5.7.20-winx64 ；
编辑用户变量 Path ，将%MYSQL_HOME%\bin 追加到 Path 变量值后面。注意不是覆盖。

2、将my-default.ini名称改为：my.ini
下面是参数配置
[mysql]
default-character-set = utf8mb4
[mysqld]
basedir=C:\mysql-5.7.20-winx64
datadir=C:\mysql-5.7.20-winx64\data
bind-address = 0.0.0.0
server-id = 1
init-connect = 'SET NAMES utf8mb4'
character-set-server = utf8mb4

max_connections = 1000
max_connect_errors = 6000
open_files_limit = 65535
table_open_cache = 128
max_allowed_packet = 4M
binlog_cache_size = 1M
max_heap_table_size = 8M
tmp_table_size = 16M

read_buffer_size = 2M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
join_buffer_size = 8M
key_buffer_size = 4M

thread_cache_size = 8

query_cache_type = 1
query_cache_size = 8M
query_cache_limit = 2M
ft_min_word_len = 4
log_bin = mysql-bin
binlog_format = mixed
expire_logs_days = 30

log_error = C:\mysql-5.7.20-winx64\data\mysql-error.log
slow_query_log = 1
long_query_time = 1
slow_query_log_file = C:\mysql-5.7.20-winx64\data\mysql-slow.log
performance_schema = 0
explicit_defaults_for_timestamp

#lower_case_table_names = 1

skip-external-locking

default_storage_engine = InnoDB
innodb_file_per_table = 1
innodb_open_files = 500
innodb_buffer_pool_size = 64M
innodb_write_io_threads = 4
innodb_read_io_threads = 4
innodb_thread_concurrency = 0
innodb_purge_threads = 1
innodb_flush_log_at_trx_commit = 2
innodb_log_buffer_size = 2M
innodb_log_file_size = 32M
innodb_log_files_in_group = 3
innodb_max_dirty_pages_pct = 90
innodb_lock_wait_timeout = 120

bulk_insert_buffer_size = 8M
myisam_sort_buffer_size = 8M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 1

interactive_timeout = 28800
wait_timeout = 28800

3、 安装mysql服务
MySQL-5.7.20提示msvcr120.dll丢失，需要安装vc2015，下载地址https://www.microsoft.com/en-us/download/details.aspx?id=48145

管理员身份在命令提示符下运行
C:\>cd mysql-5.7.20-winx64
C:\mysql-5.7.20-winx64>cd bin
C:\mysql-5.7.20-winx64\bin>mysqld -install MySQL --defaults-file="C:\mysql-5.7.20-winx64\my.ini"

4、初始化MySQL-5.7.20
data文件夹不为空是不能执行这个命令的。密码可以去进入data文件，打开一个.err结尾的文件查看，如果设置了errorlog那么在mysql-error.log查看密码
C:\mysql-5.7.20-winx64\bin>mysqld --initialize 自动生成带随机密码的root用户
C:\mysql-5.7.20-winx64\bin>mysqld --initialize-insecure 自动生成无密码的root用户

5、启动MySQL服务器，在命令提示符中运行命令：net start MySQL。
C:\mysql-5.7.20-winx64\bin>net start mysql
MySQL 服务正在启动 .
MySQL 服务已经启动成功。

6、修改密码
命令如下：
mysql -uroot -p
ALTER USER 'root'@'localhost' IDENTIFIED BY 'z123456789';

或者
C:\mysql-5.7.20-winx64\bin>mysqladmin -uroot -p password
Enter password:
New password:
Confirm new password:

7、卸载MySQL服务
在命令提示符下进入到C:\mysql-5.7.20-winx64\bin>输入"mysqld -remove"或者"sc delete mysql"执行卸载服务
C:\mysql-5.7.20-winx64\bin>mysqld -remove
Failed to remove the service because the service is running
Stop the service and try again

先要停止MYSQL
net stop mysql