I will appreciate any help you can provide me.

In the company where i work we have a project which creates about 4-5M records daily of stats. We're currently storing this data in a db named 'summary' which contains all the stats data for up to 15 days. After that we begin to move the data in a daily basis to a single 'archived like' unique table in another fast performance mysql instance. Why we do this ? to respect the 80%-20% rule:...