Concurrently applying redo records to backup database in a log sequence using single queue server per queue at a time
December 8, 2009. 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 ReferencesJournal back-up storage control for a data processing system Buffered peripheral subsystems Method for assuring atomicity of multi-row update operations in a database system Method and apparatus for logging journal data using a log write ahead data set Method for managing a buffer pool referenced by batch and interactive processes Central computer backup system utilizing localized data bases Distributed multiprocess transaction processing system and method Method for restarting a long-running, fault-tolerant operation in a transaction-oriented data base system without burdening the system log Method for managing reuse of hard log space by mapping log data during state changes and discarding the log data Computer system architecture employing cache data line move-out queue buffer InventorsApplicationNo. 411729 filed on 09/25/1989US Classes:707/201, Coherency (e.g., same view to multiple users)711/115, Detachable memory714/16, Forward recovery (e.g., redoing committed action)714/20Plural recovery data sets containing set interrelation data (e.g., time values or log record numbers)ExaminersPrimary: Anderson, Lawrence E.Assistant: Shah, Alpesh M. Attorney, Agent or FirmInternational ClassesG06F 015/40G06F 015/417 G06F 012/00 G06F 012/16 AbstractChange processing of a replica database is accomplished by separating redo records obtained from the transaction log of a primary database into respective queues. The redo records are separated such that all transaction records for a unit of transfer (page) of the primary database are placed on the same queue in log sequence. Each queue is linked exclusively to one of a plurality of parallel queue servers. Each queue server applies to the replica database the redo records in the queues which it exclusively serves. The replica database is thereby made consistent with the primary data by a lock-free updating mechanism which services the pages of the replica database in parallel.Other References
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