Mysql maximum number of connections

Global Maximum Connections: The total number of all connections to the database engine

查看：mysql-> show variables like '%max_connections%'  \g

Settings: mysql->set global  max_connections=xxx \g -- (only for the current process, reset after the service is restarted)
Maximum number of connections for users: the maximum number of connections for a single client

View: mysql-> show variables like '%max_user_connections%'  \g
Settings: mysql->set global  max_ user_ connections=xxx \g -- (only for the current process, reset after the service is restarted)
Refresh: flush privileges

The above settings are only valid for the current process, and will be reset after the Mysql service is restarted.

Modify my.ini and  add max_connections = xxx and  max_user_connections = xxx  in the [mysqld] section to  make it persistent