SQL> conn / as sysdba
Connected.
SQL> show user
USER is "SYS"
SQL> select instance_name from v$instance
  2  ;

INSTANCE_NAME
----------------
orcl

SQL> select instance_name
  2  from v$instance;

INSTANCE_NAME
----------------
orcl

SQL> select name
  2  from v$database;

NAME
---------
ORCL

SQL> show parameter shared_pool_size;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
shared_pool_size                     big integer 0
SQL> show parameter sga_target;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
sga_target                           big integer 0
SQL> show parameter memory_target;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
memory_target                        big integer 808M
SQL>