Hey Venkey,
First understand the concept of dashboard, how much records you can deal with. Are you trying to test any records to append here or working on any real-time design. Break you records into piece's take only the valid data inside. Still you feel that you all your data inside the dashboard then apply filters or prompts to minimize the record set. Its all upto you, but never go beyond 512 rows which will always hamper your dashboard.
Hope you got it.
Dashboard Design Best Practices
Dashboards (Xcelsius) General Best Practices - Business Intelligence (BusinessObjects) - SCN Wiki
--SumanT