max_connections 是指MySQL服務器的最大連接數。即所有用戶最大連接數的和。
max_user_connections 是指MySQL中單個用戶的最大連接數。
這里說明當前用戶的連接數大于了單個用戶的最大連接數，需要擴大連接數：

mysql> show variables like '%connect%'; +-----------------------------------------------+-----------------+ | Variable_name | Value | +-----------------------------------------------+-----------------+ | character_set_connection | utf8mb3 | | collation_connection | utf8_general_ci | | connect_timeout | 10 | | disconnect_on_expired_password | ON | | init_connect | | | max_connect_errors | 100 | | max_connections | 4000 | | max_user_connections | 1500 | | mysqlx_connect_timeout | 30 | | mysqlx_max_connections | 100 | | performance_schema_session_connect_attrs_size | 512 | +-----------------------------------------------+-----------------+ 11 rows in set (0.00 sec)mysql> set global max_user_connections=4000; Query OK, 0 rows affected (0.00 sec)mysql> show variables like '%connect%'; +-----------------------------------------------+-----------------+ | Variable_name | Value | +-----------------------------------------------+-----------------+ | character_set_connection | utf8mb3 | | collation_connection | utf8_general_ci | | connect_timeout | 10 | | disconnect_on_expired_password | ON | | init_connect | | | max_connect_errors | 100 | | max_connections | 4000 | | max_user_connections | 4000 | | mysqlx_connect_timeout | 30 | | mysqlx_max_connections | 100 | | performance_schema_session_connect_attrs_size | 512 | +-----------------------------------------------+-----------------+ 11 rows in set (0.00 sec)

總結

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