1、
sed -n "22,25p" /etc/init.d/mysqld
2、三种关闭mysql的方式
service mysqld stop
kill pidxx
mysqladmin xx shutdown
3、更换配置文件启动
mysqld_safe --defaults-file=/data/xx/my.cnf 2>&1 >/dev/null &
4、mysql几个常用软件
mysql, mysqladmin , mysqldump , mysqlbinlog
5、连接方式
mysql -h -u -p -P
mysql -u -p -S /xx/x.sock
6、删除历史命令
history -d 211
history -c 清除
7、配置文件设置权限 600
8、退出 ： quit/exit
9、msyql初始化安全设置
delete from mysql.user;
grant all privileges on . to myroot@'localhost' identified by 'pass' with grant option;
flush privileges;
10、修改密码
mysqladmin -uroot -p password xxx
set password for root@localhost=password('xxx')
update user set password=password('123') where user='root' and host='localhost';
alter user 'root'@'localhost' IDENTIFIED BY 'liuhehe';

忘记密码：mysqld --skip-grant-tables

11、DQL,DML,DDL
select * from x order by x
delete from mysql.user where x=''
create database dd1;
show databases;
show create database dd1\G;
create database dd2 default character set gbk collate gbk_chinese_i;

配置文件加字符集

-DDEFAULT_CHARSET= utf8
-DDEFAULT_COLLATION=utf8_general_ci
select database();
use dd1;
show tables;
show tables from dd1;
drop database xx;
12、
select user,host from mysql.user;
create user x@x identified by 'x';
show grants for bbx@xx;
drop user x@x;
grant all privileges on x.* to x@x identified by x;

回收权限

revoke select on . from x@x;
13、DDL
create table x(
a int(4) not null,
name char(3) not null,
dep varchar(11) default NULL
);
desc x;
auto_increment
rename x to y;
alter table x rename to y;
alter table x add b int(2) not null;
alter table x drop qq;
alter table x modify x ;
alter table test add index x(name);
create index indexqq on test(qq)
14、
insert into test(id,name) values(1,"dd");
delete from test;
select * from test limit 1,3;
selelect * from x id>2 and id <5;
order by id asc/desc;
update x set x=y, where x;
source xx.sql;
truncate table x;
drop table if exists test;