rds有控制台啊，定位下是哪个用户的连接数突然上涨，然后找到对应的app就好了。

https://help.aliyun.com/document_detail/41714.htm?spm=a2c4g.11186623.0.0.69f23787OWD0fv

select
user, db, substring_index(host,’:’,1) as host, count(*) as cnt
from information_schema.processlist
group by user, db, substring_index(host,’:’,1)
order by user, db, host;