The setting up of a circular log implementation to be able to detect amnesia in a circular log, and to the determination of whether or not amnesia has occurred in such a circular log. Upon detecting a checkpoint trigger, information is preserved sufficient to detect whether or not the removed records ever existed in the circular log. If a request for information from a record were subsequently to be received by the circular log implementation, and if the record was not actually in the circular log, the preserved information could then be consulted to see if it indicates that the record had once existed in the circular log. If the information indicates that the record had once existed in the circular log, then amnesia has not occurred. If the information does not indicate that the record had once existed in the circular log, then amnesia has occurred. Accordingly, amnesia detection is made possible even in a complicated circular log implementation.