Replicating a database by the sequential application of hierarch

Details Replicating a database by the sequential application of hierarch Replicating a database by the sequential application of hierarch

1992-10-13

1996-06-25

Kulik, Paul V.

Boots, shoes, and leggings

395650, 395700, 39518205, 39518214, 395575, 364DIG2, 36494391, 3649442, 3649701, G06F 1730

Patent

active

055308554

ABSTRACT:
A method and system are provided for continuously maintaining replicas of an active database in a backup system for disaster recovery purposes. Redo records transmitted from an active system are received into a dataspace work area in a backup system memory. Redo records in the work area for an uncommitted database transaction are grouped together. When a transaction becomes a committed transaction, the redo records for the transaction are sorted with redo records from other committed transactions according to database, block number within a database, offset location within a block, and sequence of occurrence. A plurality of update blocks from a backup database are read into a buffer in the backup system memory. The sorted redo records are sequentially applied to corresponding data records in the update blocks. The update blocks are then immediately written back to the database.

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