Information management device, information management method, and information management program

An information management method executed by an information management device that manages spatio-temporal information including time information and position information as well as associated data associated with the spatio-temporal information by distributing the spatio-temporal information and associated data across a plurality of nodes that are key-value stores, the method comprising:

• converting said spatio-temporal information in storage object information into a one-dimensional bit string, splitting at least the converted one-dimensional bit string into an upper bit string and a lower bit string, and causing a storage target node to store the split upper bit string in a key and to store the split lower bit string and said associated data in a value of that key;
• and
• converting a range condition of spatio-temporal information of an object to be retrieved into one-dimensional bit string, splitting the converted one-dimensional bit string into an upper bit string and a lower bit string, retrieving a key from a search target node using at least the split upper bit string, retrieving a value corresponding to the split lower bit string from values of the retrieved key, and outputting associated data contained in the retrieved value as a search result.

A non-transitory computer-readable recording medium storing therein an information management program for causing a computer to execute a process comprising:

• converting spatio-temporal information including time information and position information of storage object information that includes spatio-temporal information and associated data associated with the spatio-temporal information, into a one-dimensional bit string, splitting the converted one-dimensional bit string into an upper bit string and a lower bit string, and causing a storage target node that is a key-value store to store at least the split upper bit string in a key and to store the split lower bit string and said associated data in a value of that key;
• and
• converting a range condition of spatio-temporal information of an object to be retrieved into one-dimensional bit string, splitting the converted one-dimensional bit string into an upper bit string and a lower bit string, retrieving a key from a search target node using at least the split upper bit string, retrieving a value corresponding to the split lower bit string from values of the retrieved key, and outputting associated data contained in the retrieved value as a search result.