To check where the connections are made to a database

To check where the connections are made to database the below queries are have been very helpful.


-- Get a count of SQL connections by IP address
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];

-- Get a count of SQL connections by login_name
SELECT login_name, COUNT(session_id) AS [session_count]
FROM sys.dm_exec_sessions
GROUP BY login_name
ORDER BY login_name;

The above queries can be used in conjuction with Top Waits Stats rollup query here to get the best understanding whats SQL Server is waiting on and where the connections are coming to the SQL Server with aggregated connections from each login.