Ben Miller takes us through a way to know your data:
You have many tables in your databases and you want to know how they are used. There are DMVs for index usage stats which will tell you about like sys.dm_db_index_usage_stats and querying them is insightful, but how do the stats change over time? These stats are reset when the instance is restarted and it is good to know that you have 2000 seeks and 500 scans of the index, but when did they happen? Was it on a common day? Common hour?
Ben has a way to help you figure that out.