Concurrently applying redo records to backup database in a log s

Details Concurrently applying redo records to backup database in a log s Concurrently applying redo records to backup database in a log s

1989-09-25

1992-12-08

Anderson, Lawrence E.

Boots, shoes, and leggings

395575, 395250, 3642821, 3642853, 364DIG1, 371 81, 371 291, 371 165, G06F 1540, G06F 15417, G06F 1200, G06F 1216

Patent

active

051704803

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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