While running a policy check, I stumbled across a number of objects with 'dta_' in their name. If you find similar objects, then these are left-over objects of running a Database Engine Tuning Advisor session that for some reason did not finish and thus did not clean up properly after itself.
So if you see objects with 'dta_' in their name, the Index Tuning Advisor is where they came from. If you do not mind losing the results of the previous tunings.
So if you see objects with 'dta_' in their name, the Index Tuning Advisor is where they came from. If you do not mind losing the results of the previous tunings.