Concurrently applying redo records to backup database in a log sequence using single queue server per queue at a time
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United States of America Patent
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Dec 8, 1992
Grant Date -
N/A
app pub date -
Sep 25, 1989
filing date -
Sep 25, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Change 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.
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