A temporal database stores data relating to time instances. It offers temporal data types and stores information relating to past, present and future time.Temporal databases could be uni-temporal, bi-temporal or tri-temporal. A temporal database stores data relating to time instances. It offers temporal data types and stores information relating to past, present and future time.Temporal databases could be uni-temporal, bi-temporal or tri-temporal. More specifically the temporal aspects usually include valid time, transaction time or decision time