摘要 |
A database system, which updates data by an application program, includes data storage 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. The database system is robust against variation of application programs and environments.
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