About a report's performance.

Question

Hi , i use Report Builder 9.0.4.0.33 , i have here a sample query that i put in about 6 or 7 Formulas to return different values based on different parameters , when the client runs this reports through the browser it takes forever to show .... is there any way to increase the performance of this report ?
select sum(nvl(invoice_commission,0))
  into v_comm
  from invoice
  where trunc(invoice_date) between :date1 and :date2
  and currency_code = '$'   -- sometimes 'euro' and so no
  and ISSUE_PLACE <> =  'xx'
  and investor_code = :investor_code;
  return(v_comm*5.5137);

Answer 1

One performance consideration I'd do is try to avoid multiple similar queries or even repeats of the same query.
Is
from invoice
where trunc(invoice_date) between :date1 and :date2
and currency_code = '$' -- sometimes 'euro' and so no
and ISSUE_PLACE = 'xx'
and investor_code = :investor_code;
return(v_comm*5.5137);
in main query? Can those Formulas be included/replaced into the main query? Are appropriate Indexes created for the joins?