What is a materialized view? The concept and usage of the embodied view

Explanation of IT Terms

Materialized View: The Concept and Usage of the Embodied View

A materialized view is a database object that stores the results of a query and represents a physical replica of the query’s result set. In other words, it is a precomputed table that is derived from one or more tables, based on a query. The concept of materialized views is a powerful tool in the field of database management systems, providing improved query performance and enabling faster data retrieval.

Materialized views are particularly useful in situations where complex and resource-intensive queries need to be executed frequently. Instead of executing the query each time it is needed, the materialized view offers a cached version that can be accessed instantaneously. This can significantly reduce the execution time and the workload on the database server.

So, how does a materialized view work? Once a materialized view is created, it is populated with the results of the query. The view is stored as a separate table, allowing subsequent queries to access the data directly from the materialized view, without the need to recompute it. The data in the materialized view is periodically refreshed or updated to reflect any changes that have occurred in the underlying tables.

One of the key advantages of using materialized views is the ability to precompute and store expensive queries, which can significantly improve the performance of analytical or aggregate queries. For example, if a query involves complex joins, aggregations, or calculations, executing it directly on the base tables can be time-consuming. By creating a materialized view that captures the result of that query, future executions can be streamlined, resulting in substantial performance gains.

Materialized views can also play a vital role in data integration and data warehouse scenarios. They can be used to consolidate data from multiple sources and provide a unified view of the data. By creating materialized views that aggregate data across various systems, organizations can gain valuable insights and facilitate reporting and analysis.

It’s important to note that materialized views require maintenance to ensure the data remains up to date. Depending on the frequency of data changes in the underlying tables, the materialized view may need to be refreshed periodically, either on a scheduled basis or triggered by specific events.

In conclusion, a materialized view is a powerful tool in the world of database management systems, offering improved query performance and efficient data retrieval. By precomputing and storing the results of complex queries, materialized views can significantly reduce the workload on a database server and enhance overall system performance. When used strategically, materialized views can help organizations gain valuable insights and make informed decisions based on the most up-to-date data.

Reference Articles

Reference Articles

Read also

[Google Chrome] The definitive solution for right-click translations that no longer come up.