DB.DBA.RDF_ALL_USER_PERMS_DEL — Removes all the setting of
permissions of an user, both default permissions and permissions on
in uname varchar ,
in uid integer := null
This function removes all the setting of permissions of user
named uname, both default permissions and permissions on specific
graphs. The only exception is that it does not remove default
permissions if the specified user is "nobody" or "dba", but all
graph-specific permissions are always removed.
The procedure can deal with disabled users. Moreover it can be
used with entirely deleted users as soon as user id is known. It is
possible to pass NULL instead of user name and an integer user ID
as a second argument.
The user U_ID in the system table DB.DBA.SYS_USERS.