在mysql安装目录中找到mysql的配置文件(windows中名为my.ini,linux系统一般名为my.cnf)
# The maximum amount of concurrent sessions the MySQL server will

# allow. One of these connections will be reserved for a user with

# SUPER privileges to allow the administrator to login even if the

# connection limit has been reached.

max_connections=100

将max_connections修改为适当的数值，如500，然后在重启mysql服务即可.