Prevents unloading of a database as soon as there are no more open connections to it.
By default, any server that is started from a connection string is stopped when there are no more connections to it. Also, any database that is loaded from a connection string is unloaded as soon as there are no more connections to it. This behavior is equivalent to Autostop=Yes.
If you supply Autostop=No, then any database that you start in that connection is not unloaded when there are no more connections to it. As a consequence, the database server will not be shut down either.
The AutoStop parameter is used only if you are connecting to a database that is not currently running. It is ignored if the database is already loaded.