Deriving Production Rules for Incremental View Maintenance

摘要: It is widely recognized that production rules in database systems can be used to automatically maintain derived data such as views. However, writing a correct set of for effciently maintaining given view diffcult and ad-hoc process. We provide facility whereby user defines an SQL select expression, from which the system derives set-oriented materialization view. The maintenance are triggered by operations on view's base tables. Generally, perform incremental maintenance: materialized modified according sets changes made tables, accessible through logical tables provided rule language. some substantial recomputation may required. give algorithms that, based key information, syntactic analysis definition determine when effcient possible.