| 摘要 |
PURPOSE: A method of schema management is provided to manage schema accessed simultaneously by a number of servers by using shared memory when a multi-data management middleware server is executed simultaneously. CONSTITUTION: A schema management device receives a request for generation, change, read and write of schema from other module of a client or a middleware server and decides type of the request(201,202). If the request is for change of schema, the schema management device requests a memory allocation to a shared memory management device(204). The schema management device writes new schema information in a memory allocated by the shared memory management device(205). If the request is for change of schema, the schema management device requests memory read to the shared memory management device, reads schema information to be changed from the memory, requests memory write to the shared memory management device and writes schema information to the memory(208,209,210,211). If the request is for read of schema, the schema management device requests memory read to the shared memory management device and reads schema information from the memory(214,215). If the request is for release of schema, the schema management device requests release of schema to the shared memory management device(218).
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