| 摘要 |
To provide a database, which is robust against variation of application programs and environments. A database system, which updates data by an application program, includes data storage means for storing a master data and a shared memory area. The shared memory area includes: a first area, which loads the master data and to which an application program is allowed only to refer; and a second area, which stores a difference data generated when the application program updates the master data in the first area, and which the application program is allowed to refer to and update.
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