What is a materialized view refresh strategy?

Materialized view refresh strategy defines how and when precomputed query results are updated.

Materialized views store the physical result of a query. Since underlying data changes, the view must be refreshed. Strategies include FULL refresh (recompute everything), FAST refresh (incremental updates using logs), and ON COMMIT or ON DEMAND refresh. The choice depends on freshness requirements vs performance cost. Fast refresh requires materialized view logs and is more complex but efficient for large datasets.