The technology of main-memory database comes from disk database.Main-memory database stores all data table in memory and can provide high performace of data processing ability.It is suitable for using in real-time billing system of mobile
which requires extremely high system performance.This paper first survey main-memory database characteristic
compare with the disk database system
then
summarize the real-time billing system model
the systematic structure of the main-memory database and some functional requirements of main-memory database applied to real-time billing system.