mysql连接限制

    1. c3p0在运行一段时间后总是抛出错误：“Thread unexpectedly interrupted while performing an acquisition attempt”，查看log，发现“Data source rejected establishment of connection,  message from server: "Too many connections"”，证明mysql存在max_connections来限制外部程序对其访问的连接

    2. vi /etc/my.ini

#max_connections=100
max_connections=1000

    3. sudo /sbin/service mysqld restart