| 摘要 |
PROBLEM TO BE SOLVED: To reduce the consumption of a memory and to move a data group between database devices without requiring eliminating memory fragmentation at the time of scaling out in a distributed database system.SOLUTION: A group of data records managed as a group is represented as a cabinet. The cabinet represents the records showing a storage position of real data records connected in a list manner. When data is added to the data group, the list of the cabinet is extended. When the data is moved between the data base devices, one data group is collectively moved, and the cabinet is moved from a memory for cabinet of the database device of the moving destination using vacant records corresponding to the number of data records included in the moving cabinet. Even when the vacant memory of the memory for cabinet of the moving destination is discontinuous, it is used to be connected as a list.SELECTED DRAWING: Figure 6 |
