No data loss system with reduced commit latency

Details No data loss system with reduced commit latency No data loss system with reduced commit latency

2007-03-20

2009-10-06

Jalil, Neveen Abel (Department: 2165)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000

Reexamination Certificate

active

07599967

ABSTRACT:
Techniques for reducing commit latency in a database system having a primary database system and a standby database system that is receiving a stream of redo data items from the primary. The standby sends an acknowledgment for a received item of redo data before the standby writes the redo data item to a redo log for the stream. When a no more redo event occurs in the standby, the standby sets a “no data lost flag” in the redo log if the stream of redo data items has no gaps and all of the redo data items received in the standby have been written to the redo log. The database system may operate in a first mode in which an acknowledgment is sent as just described and a second mode in which an acknowledgment is sent after the redo data item has been written to the redo log.

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