Method for the dynamic replication of data under distributed system control to control utilization of resources in a multiprocessing, distributed data base system
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United States of America Patent
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Feb 14, 1984
Grant Date -
N/A
app pub date -
Nov 27, 1981
filing date -
Nov 27, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for dynamic replication of data under distributed system control to control the utilization of resources in a multiprocessing, distributed data base system. Previously, systems providing for data replication at nodes of a multiprocessing, distributed data base system required that a central node maintain control, or that replicated data be synchronized by immediately conforming all copies of an updated data item. By this invention, requests for access to data of a specified currency are permitted and conformation of updated data is selectively deferred by use of a control procedure implemented at each node and utilizing a status and control (SAC) filed at each node which describes that node's view of the status for shared data items at other nodes.
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