Use of index based on an attribute when doing an order by

Hi,
I create a table and its indexes like this:
create table poc_wip2 of xmltype
xmlschema "http://www.derwent.co.uk/wpi.xsd" element "WPI"
alter table poc_wip2
add constraint poc_wip2_pk primary key
(XMLDATA."BibPt"."PDOC_COUNTRY",
XMLDATA."BibPt".pdoc_serial, XMLDATA."BibPt".pdoc_kind)
create index pan_index on poc_wip2 t
(extractvalue(value(t),'/WPI/BibPt/@pan'))
Now when I run the query:
select extractvalue(value(t),'/WPI/BibPt/@pan')
from poc_wip2 t
order by extractvalue(value(t),'/WPI/BibPt/@pan')
I can see that a full table scan occurs. I cannot get the query to use the index built on the pan attribute.
I tried adding a INDEX_FFS hint, but this does not work when I name the pan_index, it only works with
INDEX_FFS(t), in which case the query then uses the primary key index.
Is it possible to get the query to use the pan_index index?
Thanks
Pete

Hi
Create a restricted key figure with the ZSE_BPNV1 and mention the values of the attribute and display the values
Here you can mention your charecteristic and attrribute value both with the key figure
Assign points if useful
Regards
N Ganesh

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user10450559 wrote:
Hi All
I am using a query with a group by caluse without any WHERE caluse.There are indexes on columns in the select clause,but the explain plan shows a full table scan.Can this be avoided and make use of indexes?In principle there are cases where Oracle can use an index range or full scan to do a group by without sorting if the "group by" columns are the leading columns in the index. But if you want an intelligent answer in your case, you will have to post the query and the definition of the index you think is the one that should be used.
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Use of index based on an attribute when doing an order by

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