A real-time database (RTDB) requires a main memory database (MMDB) to support it as its base. The vulnerability of an MMDB makes its loading (including initial loading and reloading) very frequent, which has a large influence on system performance. Traditional database loading approaches are not suitable for Real-Time MMDBs. In this paper, the authors first give the properties of real-time transactions and data which have influence on the loading of a database, then present a strategy and algorithm for DB loading.