查看最大连接数

SELECT @@MAX_CONNECTIONS

查看指定数据库的连接数

SELECT * FROM master.dbo.sysprocesses WHERE dbid IN
(
SELECT dbid FROM master.dbo.sysdatabases
WHERE NAME='DB_WMS_KZJ'
)

获取当前SQL服务器所有的连接详细信息

SELECT * FROM sysprocesses

获取自上次启动 SQL Server服务 以来连接或试图连接的次数

SELECT @@CONNECTIONS

查看连接数

select   hostname 主机名,count(*) 连接数量  from   master.dbo.sysprocesses group by hostname order by count(*) desc

或者

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_idRIGHT 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

参考：
https://m.656463.com/wenda/rhcxSQLSERVERzljcdzdljs6496_77
https://blog.csdn.net/w13511069150/article/details/115396501