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When executing DML1 on a table referenced by a large number of indexed views, or fewer but very complex indexed views, those referenced indexed views will have to be updated as well. As a result, DML query performance can degrade significantly, or in some cases, a query plan cannot even be produced. In such scenarios, test your DML queries before production use, analyze the query plan and tune/simplify the DML statement.(c) https://docs.microsoft.com/ru-ru/sql/relational-databases/views/create-indexed-views?view=sql-server-2017
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