Index size greater than table size

Question

HI ,
While checking the large segments , I came to know that index HZ_PARAM_TAB_N1 is larger than table HZ_PARAM_TAB . I think it's highly fragmented and requires defragmentation . Need your suggestion on the same that how can I collect more information on the same . Providing you more information .
1.
select sum(bytes)/1024/1024/1024,segment_name from dba_segments group by segment_name having sum(bytes)/1024/1024/1024 > 1 order by 1 desc;
SUM(BYTES)/1024/1024/1024 SEGMENT_NAME
81.2941895 HZ_PARAM_TAB_N1
72.1064453 SYS_LOB0000066009C00004$$
52.7703857 HZ_PARAM_TAB
2. Index code
<pre>
COLUMN_NAME COLUMN_POSITION
ITEM_KEY 1
PARAM_NAME 2
</pre>
Regards
Rahul

Answer 1

Hi ,
Thanks . I know that rebuild will defragment it . But as I'm on my new site , I was looking for some more supporting information before drafting the mail on the same that it requires re org activity .It's not possible for an index to have the size greater than tables as it contains only 2 columns values + rowid . Whereas tables contains 6 columns .
<pre>
Name      Datatype      Length      Mandatory      Comments
ITEM_KEY      VARCHAR2      (240)      Yes      Unique identifier for the event raised
PARAM_NAME      VARCHAR2      (2000)      Yes      Name of the parameter
PARAM_CHAR      VARCHAR2      (4000)      
     Value of the parameter only if its data type is VARCHAR2.
PARAM_NUM      NUMBER      
     Value of the parameter only if its data type is NUM.
PARAM_DATE      DATE      
     Value of the parameter only if its data type is DATE.
PARAM_INDICATOR      VARCHAR2      (3)      Yes      Indicates if the parameter contains existing, new or >replacement values. OLD values currently exist. NEW values create initial values or replace existing values.</pre>
Regds
Rahul