Importance

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Abstract

In a data processing system having a first external memory, a second external memory, and a control memory for storing information on data renewals in the first external memory, a system and a method provide for back-up operations in parallel with ordinary data processing, including dump processing in which renewed data parts in the first external memory are copied as backup data into the second external memory with reference to the contents of the control memory. The method provides the step of storing into the control memory first identifier information for identifying areas of the first external memory where data items were renewed; the step of storing into the control memory second identifier information for identifying areas of the first external memory where data items were renewed during the dump processing; and the step of erasing at completion of the dump processing the first identifier information items except those which identify the same areas as identified by the second identifier information items. Thus, ordinary job processing and the renewals of the data items of the first external memory can be performed even in the course of the data dumping processing.

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First Claim