Could you explain the mechanism of a change tracking system that uses materialized views?

The change tracking system using materialized views works as follows:

• A materialized view is a stored result of a query that is updated when the underlying data changes.
• When data in the base tables changes, the system records these changes (for example, through triggers or change logs).
• Then, the materialized view is refreshed to reflect the current state of the data, without needing to be completely recalculated each time.

This allows for quick retrieval of aggregated or precomputed data, reducing system load during frequent queries.

Example: if you have an orders table and a materialized view with sums per customer, when a new order is added, only the relevant record in the view is updated, not the entire table.