Ken,

>How much downtime can you actually tolerate?
We can actually bring the databases down for say 30-35 hours on the weekend if required.

Do you have any long, long/raw, clob or blob columns in your data?
>NO...its just plain data.....but have huge tables (4-5 tables) containing almost 10 million records each....

Is your data timestamped?
>What do you mean by timestamped?

ixion...thanks for your suggestions....will think over them and get back to you....

Thanks,
Reddy.