Description: Materialized views are database objects that store the results of a SQL query. Unlike conventional views, which are generated in real-time each time they are accessed, materialized views persistently store data, allowing for faster and more efficient access. This is particularly useful in scenarios where queries are complex and require intensive processing, as storing results reduces server load and improves overall application performance. Materialized views can be updated periodically or on-demand, allowing for relatively up-to-date information without sacrificing access speed. Their use is common in various data systems and applications where quick access to large volumes of information is required. Additionally, materialized views can be used to simplify complex queries, providing a more user-friendly interface for end-users. In summary, materialized views are a powerful tool in optimizing database performance, facilitating quick access to pre-processed data and improving efficiency in information management.
History: Materialized views emerged in the 1980s as a solution to improve database performance in intensive query environments. Although the concept of views already existed, the need to optimize access to complex data led to their development. In 1988, the term ‘materialized views’ was used in an academic paper discussing their implementation in database systems. Since then, their use has expanded with advancements in database technology, being adopted by various database systems.
Uses: Materialized views are primarily used in data analysis systems, where quick access to large volumes of information is required. They are also useful in reporting applications, where data needs to be queried frequently and response time minimization is sought. Additionally, they are employed in optimizing complex queries, allowing developers and analysts to access precomputed results without having to execute the original query each time.
Examples: A practical example of a materialized view is in a sales system, where a view can be created to store the total sales by product and by month. This allows analysts to quickly access this information without having to calculate it in real-time. Another case is in an inventory management system, where a materialized view can show the current status of products in stock, facilitating decision-making regarding restocking.
