如果您需要在不重新启动MySQL的情况下增加MySQL连接数，请执行以下操作

mysql> show variables like 'max_connections';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 100   |
+-----------------+-------+
1 row in set (0.00 sec)

mysql> SET GLOBAL max_connections = 150;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like 'max_connections';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 150   |
+-----------------+-------+
1 row in set (0.00 sec)

这些设置将在MySQL重新启动时更改。

对于永久更改，请在my.cnf中添加以下行，然后重新启动MySQL

max_connections = 150