【前提】
使用centos7已经大于使用centos6.x了,但是因为centos7中利用systemctl进行进程管理
所以其中有些用法需要特别记录一下
【安装mysql】
wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
rpm -ivh mysql-community-release-el7-5.noarch.rpm
ls -1 /etc/yum.repos.d/mysql-community*
yum install mysql-server
service mysqld start或者/etc/init.d/mysqld start
---进入mysql (mysql -uroot) 需要先配置密码
方法1: 用SET PASSWORD命令
MySQL -u root
mysql>
SET
PASSWORD
FOR
‘root‘
@
‘localhost‘
=
PASSWORD
(
‘newpass‘
);
方法2:用mysqladmin
mysqladmin -u root
password
"newpass"
如果root已经设置过密码,采用如下方法
mysqladmin -u root
password
oldpass
"newpass"
方法3: 用UPDATE直接编辑user表
mysql -u root
mysql> use mysql;
mysql>
UPDATE
user
SET
Password
=
PASSWORD
(
‘newpass‘
)
WHERE
user
=
‘root‘
;
mysql> FLUSH
PRIVILEGES
;
在丢失root密码的时候,可以这样
mysqld_safe
--skip-grant-tables&
mysql -u root mysql
mysql>
UPDATE
user
SET
password
=
PASSWORD
(
"new password"
)
WHERE
user
=
‘root‘
;
mysql> FLUSH
PRIVILEGES
;
查看最大连接数
show variables like ‘max_connections‘;
show tables;
错误日志文件路径
mysql> show variables like ‘log_error‘;
慢查询日志文件路径
mysql> show variables like ‘slow_query_log_file‘;
日志文件路径
mysql> show variables like ‘general_log_file‘;