-- 1. Is it multitenant?

SELECT CDB FROM v$database;

-- 2. Database version

SELECT banner_full FROM v$version;

-- 3. Current container (if multitenant)

SELECT SYS_CONTEXT('USERENV', 'CON_NAME') AS current_container FROM dual;

-- 4. Strong Autonomous indicator

SELECT owner, object_name, object_type 

FROM dba_objects 

WHERE object_name = 'DBMS_CLOUD';

-- 5. Instance & host info

SELECT instance_name, host_name, version_full FROM v$instance;