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Can SQL Server view have index?
To enhance the performance of such complex queries, a unique clustered index can be created on the view, where the result set of that view will be stored in your database the same as a real table with a unique clustered index. …
When should SQL views be used?
Views are virtual tables that can be a great way to optimize your database experience. Not only are views good for defining a table without using extra storage, but they also accelerate data analysis and can provide your data extra security.
Why do you need an indexed view in SQL Server?
This causes a write overhead for the referenced tables. It means that when you write to the underlying table, SQL Server also has to write to the index of the view. Therefore, you should only create an indexed view against the tables that have in-frequent data updates.
Why are there restrictions on an indexed view?
This is why there are so many restrictions on what you can have in an indexed view – the restrictions exist so that the view can be updated just based on the rows affected in the base table, rather than (potentially) having to re-scan the entire table (s) to determine what rows the view should now contain.
How to prevent the database engine from using indexed views?
Indexed views can be created on a partitioned table, and can themselves be partitioned. To prevent the Database Engine from using indexed views, include the OPTION (EXPAND VIEWS) hint on the query. Also, if any of the listed options are incorrectly set, this will prevent the optimizer from using the indexes on the views.
How do table indexes come into play when using a view?
Yes, the underlying table indexes are used automatically – a view just pulls the data from the underlying tables after all. With regards to the benefits of creating indexes on a view, see this MS Technet article.