SELECT
last_active_time
, parsing_schema_name
, sql_text
FROM v$sqlarea
WHERE parsing_schema_name <> 'SYS'
AND parsing_schema_name <> 'SYSMAN'
AND parsing_schema_name <> 'DBSNMP'
AND parsing_schema_name <> 'MDSYS'
AND parsing_schema_name <> 'EXFSYS'
ORDER BY last_active_time DESC;
위 쿼리로 확인 가능한 범위는 REDO 로그 범위인거 같습니다.