What is a materialized view in ScyllaDB?

A materialized view is a server-managed table that automatically re-derives its rows from a base table using a different primary key layout, letting the same data be queried efficiently by a column that isn't part of the base table's partition key.

CREATE MATERIALIZED VIEW orders_by_status AS
  SELECT * FROM orders
  WHERE status IS NOT NULL AND customer_id IS NOT NULL AND order_id IS NOT NULL
  PRIMARY KEY (status, customer_id, order_id);

ScyllaDB keeps the view in sync with the base table automatically whenever the base table changes, so the application doesn't have to maintain a second table manually. The trade-off is write amplification, since every write to the base table triggers a corresponding write to each materialized view, and views are eventually consistent with the base table rather than updated in the same atomic write, which matters for applications that need strict read-after-write guarantees on the view.

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