关于查询mysql processlist的建议

查询mysql进程，因为数据库的sleep连接很多（一般都会在几千个左右），不建议直接show processlist或者show full

Processlist

尽量去用select查询

正在running的线程

Select count(*)from information_schema.processlist where info is not null;

Mysql的全部线程

Select count(*)from information_schema.processlist;

查询当前running sql执行时间最长的10条

Select * frominformation_schema.processlist where info is not null order by time desc limit10 ;

查询执行sql的ip 的连接数量

select left(host,instr(host,‘:‘)-1) asip,count(*) as num from information_schema.processlist group by ip order by num desc;

查询执行sql的user的连接数量

select user,count(*) as num from  information_schema.processlist group by userorder by num desc;

查询执行sql语句的数量

select count(*) as num,info from  information_schema.processlist where info isnot null group by info order by num;

查询mysql服务器最大连接数、当前数据库连接数和running数show global variables like ‘max_connections‘;

show global status like ‘Threads%‘;

查询用户最大连接数

show grants for ‘mysql_bi‘;

slave错误问题，需要确认数据不一致原因

adm和click库可以直接跳过1个错误

一般处理的方式包括

杀掉慢查询进程，可以针对用户，执行时间去操作

select concat(‘KILL ‘,id,‘;‘) frominformation_schema.processlist where user=‘用户名称‘ and time>100into outfile ‘/tmp/aa.txt‘;

source/tmp/aa.txt