View vs Materialized View: Key Differences & When to Use Each
A View is a saved SQL query that pulls live data every time you open it. A Materialized View is the same query, but its results are pre-computed and stored on disk—like a cached snapshot that you refresh on demand.
Teams mix them up because both look like “virtual tables.” The confusion hits when dashboards feel sluggish: you slap an index on a regular View and wonder why nothing speeds up, forgetting it still runs the query each time.
Key Differences
View: zero storage, always current, slower on big joins. Materialized View: takes disk space, can become stale, lightning fast reads. Refresh can be manual, scheduled, or incremental.
Which One Should You Choose?
Need real-time accuracy and small result sets? Use a View. Need to serve heavy analytics or BI charts without hammering the source? Pick a Materialized View and schedule refresh during off-peak hours.
Examples and Daily Life
Your e-commerce team uses a View for “active carts” updated every click. Finance runs month-end reports off a Materialized View that refreshes nightly—keeping the CFO happy without locking sales tables.
Does a Materialized View auto-update?
No. You decide when to refresh it—manually or via job scheduler.
Can I index a regular View?
Some databases let you create indexes on the underlying tables, but the View itself remains unindexed.
What happens if the base table schema changes?
Both Views and Materialized Views may need to be recreated or refreshed to reflect new columns or data types.