SELECT DB_NAME(dbid) as 'Database Name', 
COUNT(dbid) as 'Total Connections' 
FROM master.dbo.sysprocesses WITH (nolock)
WHERE dbid > 0
GROUP BY dbid
SELECT @@MAX_CONNECTIONS AS 'Max Allowed Connections'

SELECT 
    DB_NAME(dbid) as DBName, 
    COUNT(dbid) as NumberOfConnections,
    loginame as LoginName
FROM
    sys.sysprocesses
WHERE 
    dbid > 0
GROUP BY 
    dbid, loginame

SELECT 
    COUNT(dbid) as TotalConnections
FROM
    sys.sysprocesses
WHERE 
    dbid > 0

sp_who2 'Active'