SQL> create user tool identified by tool;

User created.

SQL> grant SELECT ANY DICTIONARY  to tool;

Grant succeeded.

SQL> grant CONNECT to tool;

Grant succeeded.

SQL> conn tool/tool
Connected.
SQL> select * from sys.v_$sga;

NAME                      VALUE
-------------------- ----------
Fixed Size              1301536
Variable Size         262677472
Database Buffers       25165824
Redo Buffers             262144