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What is the difference between Views and Materialized Views in Oracle?
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A materialized view is much more efficient at executing queries. The data is physically saved at a specific point in time. You don't need to re-read all the data associated with a query every single time. The drawback is that you have to make sure to view the most recent data.
Materialized views are updated periodically based upon the query definition, table can not do this. Show activity on this post. A materialized view can be set up to refresh automatically on a periodic basis. A table may need additional code to truncate/reload data.
In data warehouses, you can use materialized views to precompute and store aggregated data such as the sum of sales. Materialized views in these environments are often referred to as summaries, because they store summarized data. They can also be used to precompute joins with or without aggregations.
Views are the virtual projection of an output query or the dynamic view of the data in a database that is presented to the user whenever requested. Materialized views, on the other hand, are a non-virtual schema. It is a common part of database warehousing.
Materialized views are disk based and are updated periodically based upon the query definition.
Views are virtual only and run the query definition each time they are accessed.
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