| 摘要 |
<p>[PROBLEMS]To efficiently access the whole database even when the database stored in a storage device is partially migrated to another storage device.[MEANS FOR SOLVING PROBLEMS]A system which controls access to the database. The system has a data migration part which migrates data satisfying a migration condition inputted by a user out of the database stored in the first storage device to the second storage device, a command input part which receives input of an access command to the database, a migration judgment part which judges whether data which has to be accessed with the inputted access command is already migrated to the second storage device from the inputted access command and the inputted migration condition, and an access part which accesses data contained in the database or data migrated to the second storage device according to the access command on the basis of judgment made by the migration judgment part.</p> |
