Do you think that main memory database is something exotic ? Well, please first answer for some questions. Is the size of your database larger than 100Mb ? And how much memory is at your computer: 128Mb, 512Mb,... ?

And how expensive it will be now to upgrade memory at your computer ? Compare this cost with prices for some commercial RDBMSes. And what will you say if your database applications begin to work ten times faster ?

May be now you will not think about MMDBMS as some exotic thing for special applications. FastDB will provide you all functionality supported by DBMSes: query language, transactions, concurrent access to the data, online backups, recovery after faults.