Distributed database systems and distributed data processing system

摘要

PROBLEM TO BE SOLVED: To provide a distributed database system that can store a large amount of data associatively with one key and decrease the number of times of communication by increasing the possibility that data needed for one process is all present at one database node, and suitably handle data with high secrecy.SOLUTION: In a distributed database system 1, a pair of key information and data is transmitted from a client node 3 to a database node 2 specified based upon the key information, and stored. Further, a pair of key information and program information is also transmitted to the database node 2 specified based upon the key information. In the database node 2, a program is executed on the data stored in the pair with the key information according to the program information, and information on a result of the processing on the data in the database node 2 is transmitted to the client node 3.