Efficiency Analysis of Materialized views in Data Warehouse Using Self-maintenance

A data warehouse is a large data repository for the purpose of analysis and decision making in organizations. To improve the query performance and to get fast access to the data, data is stored as materialized views in the data warehouse. When data at source gets updated, the materialized views also need to be updated. In this article, the authors have focus on the problem of maintenance of these materialized views and address the issue of finding such auxiliary views that together with the materialized views make the data self-maintainable and take minimal space. They have proposed an algorithm that uses key and referential constraints which reduces the total number of tuples in auxiliary views, and uses idea of information sharing between these auxiliary views to further reduce number of auxiliary views.