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Explaining the Difference Between a 'View' and a 'Materialized View' in Oracle Database

In Oracle database, a view is a virtual table that is based on the result of a SELECT query. It does not store data physically but provides an abstracted and simplified view of the underlying tables. A view retrieves data dynamically at the time of query execution.

On the other hand, a materialized view is a physical copy of the view's result set that is stored on disk. This precomputed data allows for faster query performance as the data is readily available without the need to execute the underlying query each time.

When to Use a View:

Views are commonly used for simplifying complex queries, providing security by restricting access to specific columns or rows, and presenting a customized view of the data for users.

When to Use a Materialized View:

Materialized views are beneficial when dealing with large datasets that require frequent access, complex queries that involve aggregations or joins, and when there is a need for improved query performance by reducing the computation and processing time.

Overall, while views provide a dynamic and virtual representation of data, materialized views offer a performance-driven approach by storing precomputed results for faster data retrieval.

Focus Keyword: Oracle database difference between view and materialized view

Oracle Developer Interview Question: Difference between a 'view' and a 'materialized view'

In Oracle database, a 'view' is a virtual table that does not store data physically but instead retrieves data from one or more underlying tables based on a query. It is dynamic and reflects the changes made in the underlying tables instantly.

On the other hand, a 'materialized view' is a physical copy of the query result stored as a table on disk. It stores data physically and needs to be refreshed periodically to ensure the data is up to date. This can improve query performance but may require additional storage and maintenance.

When to use a 'view':

• Displaying aggregated or filtered data from multiple tables without storing the data physically.
• Providing a simplified view of complex data structures for end users.
• Restricting access to specific columns or rows of a table for security purposes.

When to use a 'materialized view':

• Improving query performance for frequently accessed or computationally expensive queries.
• Storing precomputed results for reports or analytics that do not need real-time data.
• Working with distributed databases or slow network connections where real-time data retrieval is not efficient.

Overall, the choice between a 'view' and a 'materialized view' in Oracle database depends on the specific requirements of the application and the trade-off between real-time data access and performance optimization.