How to find which table is not being used ?

Hi,
I am in need of releasing space from the common schema we have. i have been permitted to drop the tables which has not been used for the last three months.
Can anyone please suggest how to find the tables that has not been used for a given amount of time.
Thanks and Regards.
Rajib

i have been permitted to drop the tables which has not been used for the last three months.Can I just chip in an observation on this premise? It's not unusual for systems to have processes that run quarterly or even annually. You need to be very careful about dropping "unused" tables - you might just kill your organisations end of year reporting system.
Is buying more disk space really not an option?
Cheers, APC

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