A database system includes a first information processing device that accesses a first database, and a second information processing device that accesses a second database that is a standby system of the first database, wherein the first information processing device includes a processor that executes a process including transmitting to the second information processing device a query corresponding to regeneration target execution plan information among items of execution plan information for access to the first database, and the second information processing device includes a processor that executes a process including updating first information indicating characteristics of the second database in response to updating of data of the second database, regenerating the regeneration target execution plan information, based on the first information and the query, and transmitting the regenerated execution plan information to the first information processing device.
