When should you index a view?
Indexes are great because they speed up the performance and with an index on a view it should really speed up the performance because the index is stored in the database. Indexing both views and tables is one of the most efficient ways to improve the performance of queries and applications using them.
When can views be updated?
A view is basically a stored query, it holds no data so no, it won’t get updated when the tables it’s built on are. However as soon as you reference the view the query it’s based on will run, so you will see the changes made to the base tables. Yes, a view is a SELECT query against underlying tables/views.
Can views be indexed?
The first index created on a view must be a unique clustered index. Creating a unique clustered index on a view improves query performance because the view is stored in the database in the same way a table with a clustered index is stored. The query optimizer may use indexed views to speed up the query execution.
Can you put indexes on a view?
Is it possible to update the views?
Yes it is possible because view is a virtual table and can deleted,inserted and updated. View presents the table with the required piece of information for specific purpose. Views are meant only for showing data. We cannot insert or update data using view.
When is an indexed view updated in SQL Server?
If I create an indexed view (using my performance table), and then I add a new line into my performance table, is my view’s index immediately updated, or is it updated at the first user request on the view? Indexed views are maintained automatically as part of the queries that affect the base tables on which they are based.
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.
When to use a deterministic date format in indexed views?
When you refer to datetime and smalldatetime string literals in indexed views, we recommend that you explicitly convert the literal to the date type you want by using a deterministic date format style. For a list of the date format styles that are deterministic, see CAST and CONVERT (Transact-SQL).
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.