Abstract: A control method implemented by a computer configured to control a database that includes an aggregate item that records an aggregate value of transaction volume included in transaction data recorded in a blockchain, the control method including: obtaining a plurality of the transaction data recorded in the blockchain; specifying, for each of a plurality of second users who are transaction partners with a first user associated with the aggregate item, a transaction time with the first user on a basis of the plurality of transaction data; classifying the plurality of second users into a plurality of groups on a basis of dissimilarity of the transaction time; and generating the aggregate item for each of the groups in the database.

Abstract: A disclosed log monitoring method includes: receiving identification information of a user among a plurality of users and execution log data for software associated with the user; obtaining a detection condition associated with the received identification information from a storage that stores detection conditions each of which is associated with identification information of a user; determining whether the received execution log data satisfies the obtained detection condition; and outputting a result of the determining.

Abstract: Non-transitory computer-readable storage medium storing therein a monitoring omission specifying program for causing a computer to execute a process including: collecting log items respectively including generation time of events, which are transferred from a plurality of monitored devices to a first log item storage device, from the first log item storage device, and storing the collected log items in a second log item storage device, along with information on collection times; detecting a monitoring omission log item, of which a transfer delay to the first log item storage device has occurred, out of log items in the second log item storage device; and specifying, as a generation time of the transfer delay of the monitoring omission log item, a collection time of a log item generated by another monitored device and having a generation time close to the generation time of the monitoring omission log item.