Indexes in a view(how does it work?)

Question

I have a view that makes a union query between too similar tables,
selecting equal fields in both, and the field I use in the where clause are the same in both too.
That's somenthing like this:
CREATE OR REPLACE VIEW TABLE_1 AS
SELECT T1.DESC_DATA
T1.TOTAL_DATA
FROM TABLE_1 T1
WHERE T1.COD = &COD_PARAMETER
UNION
SELECT T2.DESC_DATA
T2.TOTAL_DATA
FROM TABLE_2 T2
WHERE T2.COD = &COD_PARAMETER
The first table(TABLE_1) has to many rows, around 10 millon registers, so it has index for the field cod,
but the TABLE_2 has few registers, like 1000, and has no index created.
But when I run a query using the view TABLE_1 it goes to slowly, not using the index.
How do I have to proceed in this case?
Do I have to create index for the same index in TABLE_2?
TABLE_2 not having any indexes makes the view not use indexes?
Or is something else?
The version that I'm using is Oracle 9.2.0.4.0.

Answer 1

We need more information like the explain plan.. Please look at this link about when the query is slow.
When your query takes too long ...
Thanks