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Schema Binding Option in View

In SQL Server, the SCHEMABINDING option is used when creating a view to bind the view to the schema of the underlying tables or views. This option ensures that the underlying schema of the referenced objects remains unchanged, providing additional integrity and preventing accidental modifications that could break the view's dependencies.

When a view is created with the SCHEMABINDING option, it creates a dependency between the view and the referenced objects, such as tables or other views. If any referenced object's schema is modified, the view becomes invalid and requires recompilation.

Here's an example of creating a view with the SCHEMABINDING option:


CREATE VIEW SchemaBoundView
WITH SCHEMABINDING
AS
SELECT Column1, Column2, ...
FROM TableName
WHERE Condition;

In this example, the "SchemaBoundView" is created with the SCHEMABINDING option. The view references the table "TableName" and binds its schema to the view. This means that if the schema of the "TableName" changes, such as altering column names or data types, the view becomes invalid and requires recompilation to reflect the updated schema.

The SCHEMABINDING option offers several benefits, including:

  1. Dependency Control: By binding the view to the schema of the underlying objects, it ensures that any changes to the referenced objects' schema are intentional and do not break the view's dependencies.
  2. Query Optimization: The SCHEMABINDING option allows the query optimizer to generate more efficient query plans as it has knowledge of the view's dependencies and can optimize the execution accordingly.

To alter or drop objects that are referenced by a schema-bound view, you need to first remove the SCHEMABINDING option from the view or drop the view itself.

It's important to note that the SCHEMABINDING option is not suitable for all scenarios, especially when you require flexibility in modifying the underlying objects' schema. Therefore, you should carefully consider the impact and requirements before using the SCHEMABINDING option for your views.

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