crud统计数

show status like 'com_select';
show status like 'com_insert';
show status like 'com_update';
show status like 'com_delete';

查看慢查询

show variables like '%slow_query%';
show variables like '%quer%';
show global variables like '%long_query%';

连接相关

# 查看试图连接到mysql的连接数(不管是否成功)
show status like 'connections';
show status like '%Connection%';
show variables like '%max_connections%';

#当前连接数
show processlist;

show status like 'Threads%';

查看表数量

# 某个库下的所有表
select *  FROM information_schema.TABLES   WHERE table_schema = '$db';