Definition
Views are SQL or relational expressions over the given data sources. In a data warehouse, view expression generally involves the aggregate operator. In order to keep materialized (precomputed and stored) views up to date, it is necessary to maintain the views in response to the changes at the sources. Incremental maintenance of a view involves propagating the changes at the source onto the view so that the view reflects the changes. Incrementally maintaining a view can be significantly cheaper than recomputing the view from scratch.
Historical Background
Incrementally maintaining a view can be significantly cheaper than recomputing the view from scratch, especially if the size of the view is large compared to the size of the changes [1, 2, 9]. The problem of incremental maintenance of views has been studied extensively, and several algorithms have been proposed over the years [3, 4, 9249,9250,9251,9252,9253,9254,12]. Most works (except for [7, 12]) either handled view...
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Gupta, H. (2018). Incremental Maintenance of Views with Aggregates. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_840
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