| 摘要 |
PROBLEM TO BE SOLVED: To provide a distributed DB retrieval system for reducing a load of sequence processing. SOLUTION: The distributed DB retrieval system is provided with a master node 100 and slave nodes 200. The master node 100 is provided with a locality determination table 123, which stores a data structure of an item to be acquired, the type of a condition to be satisfied by the item, and locality information in association with each other, a plan generation part 102 generating a retrieval plan, a determination part 104 acquiring locality information corresponding to a data structure and a condition type of an item obtained as a sequence from the locality determination table 123 for determining whether the item is stored in distributed databases, an update part 103 deleting a logic sequence generation request and updating the retrieval plan when the item is not stored in a distributed manner, and an execution request part 105 notifying the retrieval plan execution request to the slave nodes 200. The slave node 200 is provided with an execution request receipt part 201 receiving an execution request, and an execution part 202 executing the retrieval plan. COPYRIGHT: (C)2009,JPO&INPIT
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