Explanation/Reference:
A: The Sessions window lists active user sessions and requests for the server, application, or database. A user can have more than one session open at any given time. For example, one user may have open sessions on two databases.
If you have Administrator or Application Manager permissions, you can end all requests, end all requests for a user, or end a specific request.
C: To restructure a database:
1. From the System View, click the Database Properties icon.
2. In the Enterprise View, expand the Oracle Hyperion Planning application type, the application, and the plan type whose database you want to restructure.
3. Right-click the plan type, and select Restructure Database.
4. Confirm whether you want to restructure the database
References:
Oracle Cloud Designing with Calculation Manager for Oracle Enterprise Performance Management Cloud, page 12-21
https://docs.oracle.com/cloud/latest/epm-common/ECALC/ECALC.pdf