查看当前数据库连接情况

—查看当前数据库系统所有请求情况.我只列出了我认为比较重要有助于我解决问题的字段。
SELECT ds.session_id,
ds.status,
Db_name(dr.database_id) AS database_name,
ds.login_name,
ds.login_time,
ds.host_name,
dc.client_net_address,
dc.client_tcp_port,
ds.program_name,
dr.cpu_time,
dr.reads,
dr.writes,
dc.num_reads,
dc.num_writes,
ds.client_interface_name,
ds.last_request_start_time,
ds.last_request_end_time,
dc.connect_time,
dc.net_transport,
dc.net_packet_size,
dr.start_time,
dr.status,
dr.command,
dr.blocking_session_id,
dr.wait_type,
dr.wait_time,
dr.last_wait_type,
dr.wait_resource,
dr.open_transaction_count,
dr.percent_complete,
dr.granted_query_memory
FROM Sys.dm_exec_requests dr WITH(nolock)
RIGHT OUTER JOIN Sys.dm_exec_sessions ds WITH(nolock)
ON dr.session_id = ds.session_id
RIGHT OUTER JOIN Sys.dm_exec_connections dc WITH(nolock)
ON ds.session_id = dc.session_id
WHERE ds.session_id > 50
ORDER BY ds.program_name
—-用户连接数
SELECT login_name,
Count(0) user_count
FROM Sys.dm_exec_requests dr WITH(nolock)
RIGHT OUTER JOIN Sys.dm_exec_sessions ds WITH(nolock)
ON dr.session_id = ds.session_id
RIGHT OUTER JOIN Sys.dm_exec_connections dc WITH(nolock)
ON ds.session_id = dc.session_id
WHERE ds.session_id > 50
GROUP BY login_name
ORDER BY user_count DESC