Understand background user

Any communication between the MES object and the MES database is routed through the MES middleware. The MES middleware uses a connection string to connect to the MES database.

Whenever an MES user logs on to an application to start a session, the ID of the user is stored in the Session table in the MES database. The Session table contains the user_id column that identifies the user who started the session.

All the MES objects share a common session with the MES middleware.

The user ID available in the Session table is Null for the MES object. So, the system associates the default user that is configured as a system attribute with a transaction.

The default user configured in the system can be non-MES user.