Count Millions of Rows Fast with Materialized Views: Databases for Developers: Performance #6
Querying returning totals per day, week or month can process billions of rows. But only return a handful.
You can make these queries orders of magnitude faster by precomputing the result using materialized views.
Watch this video to learn how these work.
For details on fast refresh restrictions, see:
https://www.oracle.com/pls/topic/look...
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The Magic of SQL with Chris Saxon
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