Help required in purge process

[preeti]

Version R12/11i? = 11i
Instance PROD/TEST/VIS? = Test
Module? = AR, OIC
OS? = ?

We have a client requirement where we have to enter voluminous data (around 1 million transactions per day).
It generally degrades the system performance, so we are looking into options for purging the data greater than 7 years for AR and OIC module.

If anyone has worked on the purge process earlier for any client, please contact me.
We need the details regarding client background, client situation, project cope , solution provided by purging and value delivered to the client.

Thanks