Some RDBMS distinguish between schema owner and data user. The data users schema is using synonyms to the schema owners schema.
While the data user has an higher limit of sessions the schema owner has a limit of 1 session only.
Here comes my feature idea - it would be good to ensure, that at least taking a snapshot is working with 1 connection only. Currently taking a snapshot and comparing schemas require more than 1 sessions.
But both of those functions (snapshot, schema comparison) are core functionality for schema maintenance and customer support.

Thanks