mac下mysql的卸载和安装

1. mysql的卸载

• 1 sudo rm /usr/local/mysql
• 2 sudo rm -rf /usr/local/mysql*
• 3 sudo rm -rf /Library/StartupItems/MySQLCOM
• 4 sudo rm -rf /Library/PreferencePanes/My*
• 5 vim /etc/hostconfig (and removed the line MYSQLCOM=-YES-)
• 6 rm -rf ~/Library/PreferencePanes/My*
• 7 sudo rm -rf /Library/Receipts/mysql*
• 8 sudo rm -rf /Library/Receipts/MySQL*
• 9 sudo rm -rf /var/db/receipts/com.mysql.*

在我的mac上没有Library文件夹，故6、7、8操作执行

2.下载mysql免费版(可以用brew install mysql 但是安装的都是最新的版本)

• https://downloads.mysql.com/archives/community/

3.下载后dmg文件后，双击后一步步安转

4.安装最后一步会生成一个密码，此密码是mysql自动生成的密码

5. 启动mysql服务

sudo mysqld --user=mysql &    //不能用root用户启动

输入刚才生成的密码

5. 修改数据库密码

• SET PASSWORD FOR'root'@'localhost'=PASSWORD('new password');
• flush privileges;

6. 安装mysql后配置环境变量，以便使用mysql命令

• vi ~/.zshrc 不存在就新建
• 然后输入 export PATH=${PATH}:/usr/local/mysql/bin
• 保存后 source ~/.zshrc

7. 启动、停止和重启

• 启动MySQL服务

sudo /usr/local/MySQL/support-files/mysql.server start

• 停止MySQL服务

sudo /usr/local/mysql/support-files/mysql.server stop

• 重启MySQL服务

sudo /usr/local/mysql/support-files/mysql.server restart

8. 在/usr/local/mysql/support-files创建my.cnf文件（mac默认没有此文件），并给于666权限，才可以编辑

# Example MySQL config file for small systems.
#
# This is for a system with little memory (<= 64M) where MySQL is only used
# from time to time and it's important that the mysqld daemon
# doesn't use much resources.
#
# MySQL programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, see:
# http://dev.mysql.com/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.  

# The following options will be passed to all MySQL clients
[client]
default-character-set=utf8
#password   = your_password
port        = 3306
socket      = /tmp/mysql.sock  

# Here follows entries for some specific programs  

# The MySQL server
[mysqld]
default-storage-engine=INNODB
character-set-server=utf8
collation-server=utf8_general_ci
port        = 3306
socket      = /tmp/mysql.sock
skip-external-locking
key_buffer_size = 16K
max_allowed_packet = 1M
table_open_cache = 4
sort_buffer_size = 64K
read_buffer_size = 256K
read_rnd_buffer_size = 256K
net_buffer_length = 2K
thread_stack = 128K  

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (using the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking
server-id   = 1 

# Uncomment the following if you want to log updates
#log-bin=mysql-bin  

# binary logging format - mixed recommended
#binlog_format=mixed  

# Causes updates to non-transactional engines using statement format to be
# written directly to binary log. Before using this option make sure that
# there are no dependencies between transactional and non-transactional
# tables such as in the statement INSERT INTO t_myisam SELECT * FROM
# t_innodb; otherwise, slaves may diverge from the master.
#binlog_direct_non_transactional_updates=TRUE  

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /usr/local/mysql/data
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /usr/local/mysql/data
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50 

[mysqldump]
quick
max_allowed_packet = 16M  

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates  

[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M  

[mysqlhotcopy]
interactive-timeout

　　

• touch my.cnf
• sudo chmod 666 my.cnf

修改完后，再执行

• sudo chmod 664 /etc/my.cnf

9.查询mysql进程

• mysql.server status

10.查询mysql状态

• mysql.server status