System and method for restoring a distributed checkpointed database
First Claim
1. For use with a central database associated with a server of a network, said central database for operation with at least one distributed counterpart stored in a volatile memory of at least one respective client of said network to allow operations to be performed locally thereon, said central database further having multiple checkpoints and a stable log stored in said server for tracking operations on said central database to allow corresponding operations to be made to said multiple checkpoints, said stable log having a tail stored in said volatile memory to track operations on said distributed counterpart, said distributed counterpart subject to corruption, a system for restoring said distributed counterpart stored in said volatile memory, comprising:
- a checkpoint determination controller that determines which of said multiple checkpoints is a most recently completed checkpoint and copies said most recently completed checkpoint to said volatile memory to serve as an unrevised database for reconstructing said distributed counterpart; and
an operation application controller that retrieves selected ones of said operations from said stable log and said tail corresponding to said distributed counterpart and applies said operations to said unrevised database thereby to restore said distributed counterpart.
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Accused Products
Abstract
For use with a central database associated with a server of a network, the central database having distributed counterparts stored in volatile memories of clients of the network to allow operations to be performed locally thereon, the central database further having multiple checkpoints and a stable log stored in the server for tracking operations on the central database to allow corresponding operations to be made to the multiple checkpoints, the stable log having tails stored in the volatile memories to track operations on corresponding ones of the distributed counterparts, the distributed counterparts to corruption, a system for, and method of, restoring a distributed counterpart stored in one of the volatile memories. The system includes: (1) a checkpoint determination controller that determines which of the multiple checkpoints is a most recently completed checkpoint and copies the most recently completed checkpoint to the one of the volatile memories to serve as an unrevised database for reconstructing the distributed counterpart and (2) an operation application controller that retrieves selected ones of the operations from the stable log and a tail corresponding to the distributed counterpart and applies the operations to the unrevised database thereby to restore the distributed counterpart.
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Citations
35 Claims
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1. For use with a central database associated with a server of a network, said central database for operation with at least one distributed counterpart stored in a volatile memory of at least one respective client of said network to allow operations to be performed locally thereon, said central database further having multiple checkpoints and a stable log stored in said server for tracking operations on said central database to allow corresponding operations to be made to said multiple checkpoints, said stable log having a tail stored in said volatile memory to track operations on said distributed counterpart, said distributed counterpart subject to corruption, a system for restoring said distributed counterpart stored in said volatile memory, comprising:
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a checkpoint determination controller that determines which of said multiple checkpoints is a most recently completed checkpoint and copies said most recently completed checkpoint to said volatile memory to serve as an unrevised database for reconstructing said distributed counterpart; and an operation application controller that retrieves selected ones of said operations from said stable log and said tail corresponding to said distributed counterpart and applies said operations to said unrevised database thereby to restore said distributed counterpart. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. For use with a central database associated with a server of a network, said central database for operation with at least one distributed counterpart stored in a volatile memory of at least one respective client of said network to allow operations to be performed locally thereon, said central database further having multiple checkpoints and a stable log stored in said server for tracking operations on said central database to allow corresponding operations to be made to said multiple checkpoints, said stable log having a tail stored in said volatile memory to track operations on said distributed counterpart, said distributed counterpart subject to corruption, a method of restoring said distributed counterpart stored in said volatile memory comprising the steps of:
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determining which of said multiple checkpoints is a most recently completed checkpoint; copying said most recently completed checkpoint to said volatile memory to serve as an unrevised database for reconstructing said distributed counterpart; retrieving selected ones of said operations from said stable log and a tail corresponding to said distributed counterpart; and applying said operations to said unrevised database thereby to restore said distributed counterpart. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A network, comprising:
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a server having a volatile memory that contains a central database therein; at least one client associated with said server, said client having a volatile memory that contains a distributed counterpart of said central database to allow said distributed counterpart to be directly revised, said distributed counterpart subject to corruption; at least one nonvolatile storage unit, coupled to said server, that contains multiple alternative checkpoints of said central database and a stable log, having a tail stored in said volatile memory of said client, for tracking operations to said distributed counterpart to allow corresponding operations to be made to said multiple alternative checkpoints; and a processor, associated with said network, that executes routines for revising said central database and distributed counterpart and for restoring said distributed counterpart if said distributed counterpart is corrupted, said routines for restoring said distributed counterpart including; a checkpoint determination controller that determines which of said multiple checkpoints is a most recently completed checkpoint and copies said most recently completed checkpoint to said volatile memory to serve as an unrevised database for reconstructing said distributed counterpart, and an operation application controller that retrieves selected ones of said operations from said stable log and said tail corresponding to said distributed counterpart and applies said operations to said unrevised database thereby to restore said distributed counterpart. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification