Patent ID: 7181479

Claim:
A method for duplicating transactions, each consisting of one or more queries, between a first information processing equipment which comprises a computing device and storage and a second information processing equipment which is provided as backup for said first information processing equipment and comprises a computing device and storage, said method for duplicating transactions comprising the steps of: said first processing equipment unilaterally and sequentially executing, queries accepted by said first information processing equipment; by said first information processing equipment, before executing a query, determining whether the query to be executed has been copied to said second information processing equipment and whether the query to be executed is a commit query; if determined that the query to be executed has been copied to said second information processing equipment or if determined that the query to be executed is other than a commit query, by said first information processing equipment, immediately executing the query; and every time when it is determined that the query to be executed is a commit query which has not been copied to said second information processing equipment, by said first information processing equipment, copying all queries remaining uncopied among the accepted queries to said second information processing equipment and then executing the commit query.