suresh What is the difference between a view and a materialized view in Oracle database?
In an Oracle database, a view is a virtual table that is generated based on a query. It does not store data on its own but retrieves data dynamically from the underlying tables whenever it is queried. Views are useful for simplifying complex queries, providing data security by restricting access, and enhancing query performance by pre-joining tables.
On the other hand, a materialized view in Oracle is a physical copy of the result set of a query that is stored in the database. Unlike a regular view, a materialized view stores the data and does not need to recompute the result set every time it is queried. This can significantly improve query performance, especially for complex and time-consuming queries. Materialized views can be refreshed periodically to synchronize them with the underlying data.
In summary, the main difference between a view and a materialized view in Oracle database is that a view is a virtual representation of data that is dynamically generated at query time, while a materialized view is a physical copy of data that is stored in the database and must be refreshed to reflect changes in the underlying data.
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