Data management apparatus, data management method and data management program

1. A data management apparatus comprising:

an arrangement pattern sampling data generator for generating arrangement pattern sampling data in which process data acquired from a monitoring target and including a chronological change, and an elapsed time from a reference point of time to a point of time of the chronological change are associated with each other;

a bit pattern sampling data generator for, each time process data are acquired from the monitoring target, generating bit pattern sampling data in which a flag indicating a presence or an absence of the chronological change in the process data acquired from the monitoring target, and the process data acquired from the monitoring target and including the chronological change are associated with each other;

a storage controller for storing any one of the bit pattern sampling data and the arrangement pattern sampling data, which requires a smaller storage capacity, into a storage;

a plant control system coupled with the storage and configured to retrieve any one of the stored bit pattern sampling data and the stored arrangement pattern sampling data from the storage to control a plant including the monitoring target.

2. The data management apparatus of claim 1 further comprising:

a calculator for calculating a number-of-change-points threshold value indicating a threshold value for a number of process data each including the chronological change based on a data size needed to store the elapsed time and acquisition intervals for a process data acquisition;

wherein each time process data are acquired from the monitoring target, the storage controller stores the bit pattern sampling data if the number of process data each including the chronological change is greater than the change-point threshold value calculated by the calculator, or stores the arrangement pattern sampling data if the number of process data each including the chronological change is less than the change-point threshold value calculated by the calculator.

3. An data management method comprising:

generating arrangement pattern sampling data in which process data acquired from a monitoring target and including a chronological change, and an elapsed time from a reference point of time to a point of time of the chronological change, are associated with each other;

each time process data are acquired from the monitoring target, generating bit pattern sampling data in which a flag indicating a presence or an absence of the chronological change in the process data acquired from the monitoring target, and the process data acquired from the monitoring target and including the chronological change are associated with each other;

storing any one of the bit pattern sampling data and the arrangement pattern sampling data, which requires a smaller storage capacity, into a storage; and

retrieving any one of the stored bit pattern sampling data and the stored arrangement pattern sampling data from the storage to control a plant including the monitoring target by a plant control system coupled with the storage.

4. The data management method of claim 3 further comprising:

calculating a number-of-change-points threshold value indicating a threshold value for a number of process data each including the chronological change based on a data size needed to store the elapsed time and acquisition intervals for a process data acquisition;

wherein each time process data are acquired from the monitoring target, the bit pattern sampling data is stored in the storage controlling step if the number of process data each including the chronological change is greater than the change-point threshold value calculated during the calculation of the number-of-change-points threshold value or the arrangement pattern sampling data is stored in the storage controlling step if the number of process data each including the chronological change is less than the change-point threshold value calculated during the calculation of the number-of-change-points threshold value.

5. A data management program causing a computer to execute:

generating arrangement pattern sampling data in which process data acquired from a monitoring target and including a chronological change, and an elapsed time from a reference point of time to a point of time of the chronological change are associated with each other;

each time process data are acquired from the monitoring target, generating bit pattern sampling data in which a flag indicating a presence or an absence of the chronological change in the process data acquired from the monitoring target, and the process data acquired from the monitoring target and including the chronological change are associated with each other;

storing any one of the bit pattern sampling data and the arrangement pattern sampling data, which requires a smaller storage capacity, into a storage; and

retrieving any one of the stored bit pattern sampling data and the stored arrangement pattern sampling data from the storage to control a plant including the monitoring target by a plant control system coupled with the storage.

6. The data management program of claim 5 causing the computer to execute:

calculating a number-of-change-points threshold value indicating a threshold value for a number of process data each including the chronological change based on a data size needed to store the elapsed time and acquisition intervals for process data acquisitions;

wherein each time process data are acquired from the monitoring target, the bit pattern sampling data is stored during the storing if the number of process data each including the chronological change is greater than the change-point threshold value calculated during the calculation of the number-of-change-points threshold value, and the arrangement pattern sampling data is stored during the storing if the number of process data each including the chronological change is less than the change-point threshold value calculated during the calculation of the number-of-change-points threshold value.