监测当前SQLServer实例的连接数

SELECT    ec.client_net_address ,
        es.[program_name] ,
        es.[host_name] ,
        es.login_name ,
        COUNT(ec.session_id) AS [connection count]
FROM    sys.dm_exec_sessions AS es
        INNER JOIN sys.dm_exec_connections AS ec ON es.session_id = ec.session_id
GROUP BY ec.client_net_address ,
        es.[program_name] ,
        es.[host_name] ,
        es.login_name
ORDER BY ec.client_net_address ,
        es.[program_name];