| 摘要 |
PURPOSE:To speed up the joint processing of a relational DB system by making an I/O system DB machine execute the operation of the most of the joint processing synchronously with data transfer. CONSTITUTION:When the set of the values of columns stored in one table stored in the DB machine 13 is to be read out from the other table stored in a disk device 15, the DB machine 13 selects a row to be coupled by using an exclusive hardware for executing two-divided retrieval synchronously with the data transfer. Thus, the DB machine has the two-divided retrieving processing and a function for executing these processing in parallel and processes the most of the joint processing out of relational DB operation synchronously with the data transfer.
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