col SAMPLE_TIME for a21
col Mb for 999 999 999

select 
    SAMPLE_TIME
   ,SQL_ID
   ,SESSION_ID
   ,PGA_ALLOCATED/1024/1024 Mb
   ,TEMP_SPACE_ALLOCATED/1024 Mb
from 
    DBA_HIST_ACTIVE_SESS_HISTORY
where 
    SAMPLE_TIME between to_date('2020-05-16 11:00','YYYY-MM-DD HH24:MI') and to_date('2020-05-16 12:00','YYYY-MM-DD HH24:MI')
order by 
    SAMPLE_TIME asc
/



select 
	max(PGA_ALLOCATED/1024/1024) Mb
	, max(TEMP_SPACE_ALLOCATED/1024) Mb
from 
    DBA_HIST_ACTIVE_SESS_HISTORY
where 
    SAMPLE_TIME between sysdate-14 and sysdate
/


select 
    SAMPLE_TIME
   ,SQL_ID
   ,SESSION_ID
   ,PGA_ALLOCATED/1024/1024 Mb
   ,TEMP_SPACE_ALLOCATED/1024 Mb
from 
    DBA_HIST_ACTIVE_SESS_HISTORY
where 
    SAMPLE_TIME between sysdate-14 and sysdate
    and PGA_ALLOCATED is not null
order by 
    4 asc
/