3. Assigning Privileges and Granting Permissions : Object Permissions : Database Grants : How Database Permissions for a Session are Determined
 
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How Database Permissions for a Session are Determined
The database permissions for a session are calculated when the session connects to the database and remain in effect for the duration of the session. If, after a session connects to a database, the database permissions for one of that session’s authorization identifiers are changed, the active session is not affected. Any new sessions that are established with the same authorization identifiers are subject to the revised database permissions.