查询MYSQL当前连接数
SHOW PROCESSLIST;SHOW FULL PROCESSLIST;SHOW VARIABLES LIKE '%max_connections%';SHOW STATUS LIKE '%Connection%';
mysql> show status like 'Threads%';+-------------------+-------+| Variable_name | Value |+-------------------+-------+| Threads_cached | 58 || Threads_connected | 57 | ###这个数值指的是打开的连接数| Threads_created | 3676 || Threads_running | 4 | ###这个数值指的是激活的连接数，这个数值一般远低于connected数值+-------------------+-------+ Threads_connected 跟show processlist结果相同，表示当前连接数。准确的来说，Threads_running是代表当前并发数 这是是查询数据库当前设置的最大连接数mysql> show variables like '%max_connections%';+-----------------+-------+| Variable_name | Value |+-----------------+-------+| max_connections | 1000 |+-----------------+-------+ 可以在/etc/my.cnf里面设置数据库的最大连接数[mysqld]max_connections = 1000