Computer system and data access control method

A data access control method in a computer system, wherein

• the computer system includes at least one computer connected to a database that stores data acquired from a sensor installed in a production system in which a plurality of machines operate according to schedule information,
• in the production system, a plurality of products having different owners who are orderers are produced,
• the at least one computer includes a generation unit that generates information for controlling access to data stored in the database, and a data search unit that searches for data stored in the database, and
• the database stores operation data managed in association with identification information of the machines, and environment data which is data relating to an environment of the production system,
• the data access control method comprising:
• a first step of the generation unit acquiring the schedule information including a production schedule of the plurality of products;
• a second step of the generation unit generating, by analyzing the schedule information, first owner information for storing first access control data including identification information of the owner, identification information of the machines, and a first access period set based on operation time during which production operation of the products is performed in the machines;
• a third step of the generation unit generating, based on the first owner information, second owner information for storing second access control data including identification information of the owner included in the first access control data, a type of the environment data, and a second access period set based on the first access period included in the first access control data;
• and
• a fourth step of the data search unit controlling accesses to the operation data and the environment data based on the first owner information and the second owner information.