Perf tuning issue with a query involving between clause

Question

Hi all,
I am getting issues with performance when I try to execute this query. Given below the query and it is going for a full table scan. I think the problem is with the between clause. But I dont know how to resolve this issue
SELECT psm.member_id
FROM pre_stg_member psm
WHERE psm.map_tran_agn BETWEEN :start_transaction_agn and :end_transaction_agn
and psm.partition_key = :p_partition_key;
Having composite index on map_tran_agn and partition_key.
Please help me in this regard.
Thanks,
Swami

Answer 1

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I have the following table called sales
with sales
as
      select 1 sales_id, 1 prod_id, 1001 inv_num, 120 qty from dual
      union all
      select 2 sales_id, 1 prod_id, 1002 inv_num, 25 qty from dual
select *
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