| 摘要 |
<p>It is an object of the present invention to provide a database system capable of being rapidly accessed on the network without using a different media from the media stored primarily and capable of safely and stably backing up data without through man power. The database system comprising: a plurality of storage units 1 for storing image data; a control unit 2 for controlling the storage units 1; and a database server 3 storing attribute information including key information associated with the image data. The control unit includes operating state inspection means and redundancy storing means. The operating state inspection means executes an operating state inspection for investigating the data of residual capacity and the absence or presence of abnormalities to the storage unit at a predetermined timing, and storing the result on a table showing an operating state. The redundancy storing means selects and stores the number of redundancy of data storage locations for data storage request from the storage units identified based on the table showing the operating state and normally operated.</p> |
