Method and system for selectable consistency level maintenance i

Details Method and system for selectable consistency level maintenance i Method and system for selectable consistency level maintenance i

1994-04-15

1998-08-18

Black, Thomas G.

Boots, shoes, and leggings

39520003, 3642824, 364DIG1, G06F 1700

Patent

active

057969990

ABSTRACT:
In a resilient database system which includes a journaled database which is implemented at one or more locations within a distributed data processing system, multiple diverse consistency levels are specified which each detail a level of consistency to be maintained between a primary database and a replica database. A user is then permitted to select a particular level of consistency for each replica database. Thereafter, each update to a record within the primary database is utilized to initiate an update to the corresponding record within each replica database in a manner which is consistent with the selected level of consistency for that replica database. In this manner, a replica database which is fully consistent with the primary database may be provided for seamless switchover in the event of a primary database failure, while a second replica database may be provided to respond to queries by applications which do not require fully consistent data, greatly enhancing the efficiency of access to that database.

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