ORA-65211
        PRIORITY may only be specified for user PDBs
        
        
        Cause
        An attempt was made to specify PRIORITY for CDB$ROOT or PDB$SEED, which is illegal.
        Action
        Avoid explicitly specifying CDB$ROOT or PDB$SEED when changing PRIORITY.
        
     
    
    
        ORA-65211
        UPGRADE PRIORITY may only be specified for user PDBs
        
        
        Cause
        An attempt was made to specify UPGRADE PRIORITY for CDB$ROOT or PDB$SEED, which is illegal.
        Action
        Avoid explicitly specifying CDB$ROOT or PDB$SEED when changing UPGRADE PRIORITY.
        
     
    
    
        ORA-65211
        UPGRADE PRIORITY may only be specified for user PDBs
        
        
        Cause
        An attempt was made to specify UPGRADE PRIORITY for CDB$ROOT or PDB$SEED, which is illegal.
        Action
        Avoid explicitly specifying CDB$ROOT or PDB$SEED when changing UPGRADE PRIORITY.