Fast intersystem page transfer in a data sharing environment with record locking
May 11, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and apparatus for preventing erroneous data transfer from a digital computer Method and means for the sharing of data resources in a multiprocessing, multiprogramming environment Shared and exclusive access control Data base locking Multiprocessor system for updating status information through flip-flopping read version and write version of checkpoint data Method and apparatus for assuring adequate access to system resources by processors in a multiprocessor computer system Data base management system for real-time applications Method for lock management, page coherency, and asynchronous writing of changed pages to shared external store in a distributed computing system System and method for performing a sort operation in a relational database manager to pass results directly to a user without writing to disk System for file and record locking between nodes in a distributed data processing environment maintaining one copy of each file lock Patent #: 5202971 InventorsApplicationNo. 059734 filed on 05/11/1993US Classes:707/8, Concurrency (e.g., lock management in shared database)707/9, Privileged access707/203Version managementExaminersPrimary: Ray, Gopal C.Attorney, Agent or FirmForeign Patent References
International ClassG06F 015/40AbstractA fast technique for transferring units of data between transaction systems in a shared disk environment. The owning system, having updated the page, generates a version number for the page which is stored with a lock possessed by the owning system. When a requesting system seeks a record on the page, its request for a lock illicit an indication that a more recent version of the page is required in the local memory. The buffer management component of a DBMS, with assistance from the lock management, triggers a memory to memory transfer of the page from the owning DBMS to the requesting DBMS using a low overhead communication protocol. The transfer of page is without disk I/O or the log I/O for the updates made to the page.Other References
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