1. A method of retrieving data from a prior target logical state of a database system, the method comprising the steps of: receiving a request to retrieve said data from said prior target logical state of said database system, where the prior target logical state corresponds to a target time; and in response to said request, using an index structure that is not natively supported by said database system to retrieve said data, where said data that is retrieved using said index structure accurately reflects said prior target logical state of said database system.