Data mismatch in Test and Prod environments

Question

Hi,
we have a query in Test and Prod environments.this query is not giving same result both for Test and production. Please have a look and share your thoughts.
Select D1.C3,D1.C21,D2.C3,D2.C21
from
(select
sum(F.X_SALES_DEDUCTION_ALLOC_AMT)as C3,
O.Customer_num as C21
from
ESA_W_ORG_D O,
ESA_W_DAY_D D ,
ESA_W_SALES_INVOICE_LINE_F F
where
O.ROW_WID = F.CUSTOMER_WID
and D.ROW_WID = F.INVOICED_ON_DT_WID
and D.PER_NAME_FSCL_MNTH = '2012 / 12'
group by O.Customer_num)D1,
(select
sum(F.X_SALES_DEDUCTION_ALLOC_AMT)AS c3,
O.Customer_num as C21
from
Sa.W_ORG_D@STPRD O,
Sa.W_DAY_D@STPRD D ,
Sa.W_SALES_INVOICE_LINE_F@STPRD F
where
O.ROW_WID = F.CUSTOMER_WID
and D.ROW_WID = F.INVOICED_ON_DT_WID
and D.PER_NAME_FSCL_MNTH = '2012 / 12'
group by O.Customer_num)D2
where
D1.C21=D2.C21
and D1.C3<>D2.C3;I have done the following steps:
1. created one temporary table and searched for duplicate records because if any duplicates found am planning to delete those records. but didn't find any duplicates. searched for common column values using equi join condition. are there any possibilities in data mismatch apart from this?
2. this query is taking around 45 minutes to retrieve the output. I want to increase the performance of the query. so created Unique on 5 columns. but still taking the same time.
so uing ALL_ROW HINT and ran the query but still it's taking the same time.
so suggest me any thing needs to add to increase the performance?
appreciate your support.
Thanks.

Answer 1

If you can create a temporary database link between the two environments use DBMS_RECTIFIER_DIFF or DBMS_COMPARISON to compare the two tables' contents.
http://www.morganslibrary.org/reference/pkgs/dbms_comparison.html
http://www.morganslibrary.org/reference/pkgs/dbms_rectifier_diff.html