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Connection and Sessions

What is the differences between Connection and Sessions in SQL-Server?

The CONNECTION is the physical communication channel between SQL Server and the applications: the TCP socket, the named pipe, the shared memory . The connections show only external connections and each connection has an spid.

select a.spid , a.nt_username , a.loginame , a.program_name from sys.sysprocesses a , sys.dm_exec_connections b where a.spid=b.session_id

A SESSION is a semi-permanent interactive information interchange, between two or more communicating devices  or between an application and users.

We must open a connection in order to create a session. Normally there is one session on each connection, but there could be multiple session on a single connection.

eg. If we connect to sql server using management studio then its one connection. once we connected we can  open 3 query windows then these are 3 sessions.

Microsoft  SQL-Server has two DMVs to maintain Sessions and Connections :-

1.       Sys.dm_exec_sessions
2.       sys.dm_exec_connections

Happy Reading


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