Disclosed is a computer program stored in a computer-readable medium according to an exemplary embodiment of the present disclosure. When the computer program is executed by one or more processors, the computer program allows the following operations for data caching to be performed and the operations may include an operation of generating a cache, an operation of caching at least some of the segments and at least one of records to the cache, an operation of reading the cache when receiving an inquiry request from a client, an operation of determining to read a cursor based on whether there is a segment or record corresponding to the inquiry request in the cache; and an operation of determining whether a query for at least one of a relational database and a hierarchical database is generated based on whether there is the segment or record in the cursor.