Poor Response Time- Total on a column for n number of rows

Question

I have a table with column cost on my custom OAF page.
When I query for configuration it returns me many rows. so I have set the default rows for table = 10 and then I neatly have next button to go to other rows.
I have enabled totalling on cost column.
Row for Total appears showing sum for the costs only on that page( for only 10 rows). I click for next from drop down , and I see total for the costs for the second page.
Ex:
table has 17 rows and
page 1 :
total row at the end saying 1000.00
page 2 :
total = 1500.00
I want to display Total Cost by summing up the costs for say 300 items returned by the query on all the pages , in above case 2500.00.
I thought of a way to do it ;
I added a sumVO with query "select sum(...) from table" .
Added a new region in my page , added a messageStyleText based on the sumVO, and pulled the total cost in.
It shows me the right result, but my problem is performance.
It is getting very slow. I am using the same query as for displaying the results in table, but summing on cost column.
Can I avoid writing the sum query and do it programmatically in OAF ??
Thanks in advance.

Answer 1

Even if you use programmatic approach, what do you think program will do?
Program has to fetch all the rows in the middle tier and sum it up using for loop. No way its going to solve your problem.
First find out the reason for the slow performance using Trace option. and fix the query.
If your not able to fix it, try materialized view for the summation query.
To take sql trace for OAF page refer this link infor http://prasanna-adf.blogspot.com/2009/01/sql-trace.html
--Prasanna