SELECT INDEX_NAME,
       PARTITION_NAME,
       TABLESPACE_NAME,
       INITIAL_EXTENT,
       NEXT_EXTENT,
       PCT_INCREASE,
       NUM_ROWS
FROM DBA_IND_PARTITIONS
WHERE INDEX_NAME = decode(upper('my_index'), 'ALL', INDEX_NAME, upper('my_index'))
  AND INDEX_OWNER = upper('my_owner')
ORDER BY INDEX_NAME, PARTITION_NAME;