grant lock tables on $database.* to '$user'@'localhost';
                          # 导入导出数据库的权限

mysqldump -ueisc -p  --databases eisc > eisc.sql
                          # 导出数据库 eisc
                       
mysqldump -ueisc -peisc.cn eisc --tables bbb  > eisc.bbb.sql 
                          # 导出从数据库eisc中指定表 bbb

yum -y install holland-mysqldump.noarch   # 安装mysqldump导入导出工具


use eisc; SELECT now();DROP  TABLE eisc ;create table eisc(id int,name varchar(225),password varchar(255),xingqi varchar(255),city varchar(255));insert into eisc(id,name,password,xingqi,city) values('1','aaa','qqqqq','xingqiyi','ssss'),('2','bbb','qqqqq','xingqier','ddddafweaafe'),('3','ccc','qqqqq','xingqisan','hrgzsaedg');select * from `eisc` ;
# 进入数据库 eisc ； 删除eisc表，创建表，插入表，查询表内容

 mysqldump -ueisc -peisc.cn eisc > /root/eisc.sql
将数据库eisc导出为eisc.sql 文件

mysql -ueisc -peisc.cn -e "use eisc;delete from eisc where 'password' ='qqqqq' order by id limit 2;select * from eisc;source /root/eisc.sql;show tables;select * from eisc;"
# 进入数据库eisc，删除表中数据库password是qqqqq的，将id列 排序前两列，
# 查询表，source 导入数据库，列出表查看表。


mysqldump --skip-lock-tables  -ueisc -peisccn@eisc eisc --tables bbb  > eisc.bbb.sql
怎么避免锁表:在使用参数--skip-opt的时候，忽略了此参数AUTO_INCREMENT，导致恢复后数据没有自增id。


mysqldump --opt -d -ueisc -peisccn@eisc eisc  > eisc.bbb.sql
# 不备份任何数据，只导出数据库表结构。