Materialized view redefinition
Small changes to the definition of a materialized view are often needed in database systems. View adaptation is the process of keeping a materialized view up-to-date when the definition of the view is changed. View adaptation aims to leverage the previously materialized view to generate the new view, since the cost of rebuilding the materialized view from scratch may be expensive.
View adaptation is related to the question of answering queries using views. The new view can be thought of as a query, with the old view available to help compute it. However, view adaptation also admits in-place changes that are not possible using a query-answering approach. For example, if a redefined view contains most but not all of the records from the original view, then view adaptation could be achieved by deleting the records that no longer qualify.
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