Large Index Of Table in Oracle

col owner for a15
col SEGMENT_NAME for a35
col SizeGB for 999,999,999 heading "Size GB"
set linesize 132
set pagesize 200
set feedback off
break on report
col fn new_value filename
compute sum of SizeGB on report
select '/home/oracle/scripts/out/large_tables_report_'||to_char(sysdate, 'yyyymmdd')||'.log' as fn from dual;
spool &filename
select owner,segment_type,segment_name,bytes/1024/1024/1024 SizeGB
from dba_segments
where segment_type='INDEX' and
bytes/1024/1024/1024 > 1
order by 1,4 desc
/
spool off
set feedback on
exit