A Materialized View in PostgreSQL is a database object that stores the result of a query physically on disk, unlike a regular view that only stores the query itself. Materialized views improve performance for complex queries but require manual refreshing to update the stored data.

 Key Takeaways

·       PostgreSQL requires manual or scheduled refresh and does not support incremental refresh.

·       PostgreSQL requires explicit query changes to use materialized views effectively.

·       PostgreSQL supports REFRESH CONCURRENTLY, reducing locking issues, while Oracle handles this natively.

·       REFRESH MATERIALIZED VIEW CONCURRENTLY mv_name;

·       PostgreSQL does not support incremental Refresh for Large Data

·       PostgreSQL does not support Real-time Data Updates

Unlike SQL Server Indexed Views:

·       No requirement for schema binding

·       No limitation on many query constructs

·       No deterministic-function restrictions

You can use:

·       CTEs

·       Window functions

·       Aggregates

·       Complex joins

Postgres MV refresh is MVCC Friendly

·       Uses snapshot isolation

·       Does not block base tables

·       Works cleanly under heavy concurrency