| 摘要 |
PROBLEM TO BE SOLVED: To allow configuration information to be flexibly updated and to allow also past information before being updated to be used.SOLUTION: A data storage device 001 has a sensor DB 006 wherein measurement values of a plurality of sensors are stored, and a configuration information DB 011 wherein configuration information 012 to 015 showing attributes of measurement values, storage areas for each of the measurement values, etc., and a version management table 016 are stored. Each piece of the configuration information is given a base ID of a base where a sensor is disposed, and has columns of a start version name and an end version name showing a range of effective versions. The version management table 016 manages ranges from values of past versions to values of versions next to current versions per base ID and manages the start time and an end time of each version. When a piece of configuration information is changed, changed information is written while leaving information before being changed, and the start version name and the end version name are updated in accordance with change contents, and the current version and the next version in the version management table 016 are updated, and the end time of the current version and the start time of the next version are described. |
