We have a customer who has an Audit Trail database that is pretty big.  When they would try to run a report, it would eventually time out because the DB was so large.  We created a new DB for them and got them to report on only 1 year at a time, which worked.  Then then added another year, and it still worked.  Finally, they added a third year, and that causes the report to time out.  They then eliminated year 1 and 2 from the report and tried again, but it still timed out.  Our question is, does the DB purge itself after a report is change or has information removed from it?