A Mediator for Approximate Consistency: Supporting “Good Enough” Materialized Views

摘要

This paper addresses the needs of application designers whowould like to tell an automated assistant the following: “Here is aquery that defines a view I want to materialize within myapplication. I need this view to remain approximately consistent with the state of the data sources from which the view isderived, in accordance with declaratively specified stalenesspredicates. When the view becomes stale, follow the refresh strategyI specify (e.g., eager, lazy, hybrid). You must do this inheterogeneous environments containing both active and passive datasources”.