Creating Index on a XML generated from Dataset

Question

HI mark,
I have an XMLTYPE table that contains data of the following format
<ROWSET>
<ROW>
<column1>1</column1>
<column2>2</column2>
</ROW>
<ROW>
<column1>1</column1>
<column2>2</column2>
</ROW>
<ROW>
<column1>1</column1>
<column2>2</column2>
</ROW>
</ROWSET>
the size of the XML is around 6.6 GB
I have to index it on column 1..
Is it possible?
If so how should be my schema?
and table creation procedure?
Can I create a clustered index on column 1 (it contains unique value)
I am using an XMLTYPE table
thanks
Kathir

Answer 1

Thanks Marco and you caught me right..
I am a microsoft user..
As you said I tried creating function based index(2 to 3) but when I run a query on that table and draw explain plan it shows full table access. I didnt understand what exactly the problem is and why it didnt use the index..
would be great if some one can help me out with this...
I created index like this
Create INDEX Dataplace_Index1 on Dataplace e(e.existsnode('//syougou2')
the query goes like this(worst possible query)
select extractvalue(value(x),'//syougou2'),extractvalue(value(x),'//company_code'),extractvalue(value(x),'//address') from company_details c, table(xmlsequence(extract(value(c),'/COMPANY_DETAILS/COMPANY'))) x where
rownum < 250
and
(extractvalue(value(x),'//gyousyu_code') LIKE '%1%' OR extractvalue(value(x),'//gyousyu_code') LIKE '%2%' OR extractvalue( value(x),'//gyousyu_code') LIKE '%3%')
and
extractvalue(value(x),'//city_code') IN ('3501','3502','3503')
and
extractvalue(value(x),'//g_rieki5') NOT IN ('1')
and
extractvalue(value(x),'//jugyoin') > 1
and
extractvalue(value(x),'//g_uriage5') > 1
and
extractvalue(value(x),'//sihon') > 2
and
extractvalue(value(x),'//company_code') > '01-003541-9'
order by extractvalue(value(x),'//company_code') , extractvalue(value(x),'//g_rieki5')
and yet times a join..
My question is will functional index be helpful..
and if so is something wrong with the way I created a Fucntional Index..
why does the explain plan give Full table access
thanks
kathir