What action can improve performance for a common query on a view?

Creating a materialized view is a highly effective action for improving performance on a common query. A materialized view is a database object that stores the result of a query physically, which means that when the query is executed, it can retrieve results from this precomputed data rather than executing the underlying query each time. This can significantly reduce the time required to return results, especially for complex queries or queries that aggregate large volumes of data.

Materialized views are particularly useful in situations where the underlying data changes infrequently, allowing the view to be refreshed as needed while providing quick access to the pre-aggregated results. This can help optimize performance for queries that are frequently run, creating a balance between data accuracy and retrieval speed.

While increasing server capacity, optimizing the query structure, and using a different database can also contribute to performance improvements, they don't offer the same specific benefits for standardizing and speeding up repeated executions of the same query as a materialized view does. In particular, option A addresses the very nature of how queries are handled in a database environment, leveraging cache-like behavior to enhance speed.