What Is a Indexed Views in Microsoft SQL Server?
Materializes a view result by creating a unique clustered index; base-table changes also maintain the stored view.
How the Indexed Views Algorithm Works
Materializes a view result by creating a unique clustered index; base-table changes also maintain the stored view.
When to Use Indexed Views
Repeated expensive aggregations or joins that meet indexed-view restrictions.
How to Create a Microsoft SQL Server Indexed Views
Review data quality, existing structures, feature support, build time, and deployment requirements before creating an index on a production table.
CREATE VIEW dbo.SalesByProduct WITH SCHEMABINDING AS SELECT ProductId, COUNT_BIG(*) AS OrderCount FROM dbo.Sales GROUP BY ProductId;
CREATE UNIQUE CLUSTERED INDEX CX_SalesByProduct ON dbo.SalesByProduct (ProductId);Indexed Views Query Example
This example demonstrates the matching query shape. Check the execution plan to confirm that the engine can use the index.
SELECT ProductId, OrderCount FROM dbo.SalesByProduct;Queries Supported by Indexed Views
Repeated expensive aggregations or joins that meet indexed-view restrictions. A similar-looking predicate may not use the same access path; operators, expressions, key order, and data type all matter.
Read Performance, Storage, and Write Costs
Adds storage and can increase base-table DML costs substantially; schema binding and SET options are required. Indexes reduce some search work but require storage and add maintenance to writes.
Indexed Views Limitations and Common Mistakes
Restrictions are strict; COUNT_BIG is required for grouped indexed views and optimizer matching varies.
Do not assume that an index being present means the optimizer chose it or that the query became selective.
How to Measure and Tune Indexed Views
Measure write regression as well as reads; verify required SET options and actual plan behavior.
Compare representative plans and timings before and after, including concurrent writes and realistic data volumes.
Indexed Views Questions
Will the database always use this index?
No. The optimizer weighs selectivity, estimated costs, statistics, cache state, and the amount of data returned.
What should I verify before production?
Confirm version support, query compatibility, write overhead, build/rollback procedures, and index behavior during backup and recovery.
Official Microsoft SQL Server Index Documentation
Check Microsoft Learn: SQL Server Indexes for release-specific requirements and supported operators.