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What is indexed view explain in short?
An indexed view is a view where the result set from the query (the view definition) becomes materialized in lieu of the virtual table result set of a standard (non-indexed) view. Far too often, an indexed view is created without consideration for the costs of the indexed view.
Can I create index on view?
Indexes can only be created on views which have the same owner as the referenced table or tables. This is also called an intact ownership-chain between the view and the table(s). Typically, when table and view reside within the same schema, the same schema-owner applies to all objects within the schema.
Where does the index go when creating an indexed view?
When you create an indexed view, the result set of the view (at the time the index is created) is stored on the disk. Therefore, all data that is modified in the base table (s) will also be modified in the corresponding result set of the indexed view.
What are the advantages and disadvantages of indexed views?
Besides all the benefits that you can gain by using indexed views, there is also a (possible) disadvantage: indices on indexed views are usually more complex to maintain than indices on base tables, because the structure of a unique clustered index on an indexed view is more complex than a structure of the corresponding index on a base table.
Which is better filtered index or indexed index?
Filtered indices are a special form of nonclustered indices, where the index is narrowed using a condition in the particular query. Using a filtered index has several advantages over using an indexed view.
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.