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Sql server active connections

There are 3 dmv 
  • sys.dm_exec_connections
  • sys.dm_exec_sessions
  • sys.dm_exec_requests

1-sys.dm_exec_connections 



select c.session_id,
    c.auth_scheme,
    c.last_read,
    c.last_write,
    c.client_net_address,
    c.local_tcp_port,
    st.text as lastQuery
from sys.dm_exec_connections c
cross apply sys.dm_exec_sql_text(c.most_recent_sql_handle) st


2-sys.dm_exec_sessions 


SELECT login_name ,COUNT(session_id) AS session_count
FROM sys.dm_exec_sessions
GROUP BY login_name;


3-sys.dm_exec_requests 


select DB_NAME(er.database_id) as DBName,
    es.login_name,
    es.host_name,
    st.text,
    SUBSTRING(st.text, (er.statement_start_offset/2)+1,
        ((CASE er.statement_end_offset
          WHEN -1 THEN DATALENGTH(st.text)
         ELSE er.statement_end_offset
         END - er.statement_start_offset)/2) + 1) AS statement_text,
   er.blocking_session_id,
   er.status,
   er.wait_type,
   er.wait_time,
   er.percent_complete,
   er.estimated_completion_time
from sys.dm_exec_requests er
left join sys.dm_exec_sessions es on es.session_id=er.session_id
cross apply sys.dm_exec_sql_text(er.sql_handle) st
cross apply sys.dm_exec_query_plan(er.plan_handle) qp
where er.session_id>50 and er.session_id!=@@SPID

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