Help in tuning the Query

Question

Pls see this attached query. This is hitting a table which has around 110 mil recs. And this takes around 60 min to execute. IS there any way to tune it better? I am assuming that because this uses the ' With tmp as' clauses, it might be using the Indexes.
Can anyone suggest some tuning tips?
Satish
WITH all_edbc_pending_edg
     AS (SELECT
                a.day_sk,
                a.case_num,
                a.edg_num,
                a.edg_trace_id,
                a.application_dt, 
                a.current_elig_ind,
                a.payment_begin_dt payment_beg_dt
         FROM   fct_eligibility_2 a,
                dim_edg_activity_type b
         WHERE  a.current_elig_ind IN ('P','S','A')
and mod(case_num,2)=0
                AND b.eff_end_dt IS NULL
                AND b.activity_type_cd IN ('IN','RE','IR','PR','OG')
                AND a.activity_type_sk=b.activity_type_sk
, Pick_Latest_Prior_Med as
SELECT  t3.case_num,
        t3.edg_num,
        t3.current_elig_ind,
        t3.application_dt,
        t3.day_sk,
        t3.payment_beg_dt,
        t3.edg_trace_id
FROM   (SELECT t2.*,
               Row_number()
                 OVER(PARTITION BY t2.case_num,t2.edg_num, t2.application_dt ORDER BY t2.day_sk DESC, t2.payment_beg_dt DESC, t2.edg_trace_id DESC) AS rn
        FROM   all_edbc_pending_edg t2) t3
WHERE  t3.rn = 1
Select
       case_num,
       edg_num,
       application_dt,
       payment_beg_dt,
       edg_trace_id,
       current_elig_ind
FROM
        SELECT  t1.case_num,
               t1.edg_num, 
               t1.application_dt, 
               t1.payment_beg_dt,
               t1.edg_trace_id,
               t1.current_elig_ind
        FROM   (SELECT  t.*,
                       Row_number()
                         OVER(PARTITION BY t.case_num,t.edg_num ORDER BY t.day_sk DESC, t.payment_beg_dt DESC, t.edg_trace_id DESC) AS rn
                FROM   Pick_Latest_Prior_Med  t) t1
        WHERE  t1.rn = 1
        ) p
WHERE
       current_elig_ind IN ('P','S')

Answer 1

Check this link and post what is required as mentioned in the link.
SQL and PL/SQL FAQ
>
I am assuming that because this uses the ' With tmp as' clauses, it might be using the Indexes.
>
You don't need to assume. You can find out what's exactly happening if you follow the steps described in the above mentioned link.
Regards
Raj