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Re: Optimizer Stablility
Posted by: Øystein Grøvlen
Date: August 16, 2017 02:19AM

Hi Chris,

How MySQL handles views is very predictable. Depending on the view definition, the view may be merged into the query where it is used, or it may have to be run separately and the result stored in a temporary table. However, for a given view, the merge will either always happen or never at all.

Starting with MySQL 5.7, derived tables (subqueries in FROM clause) will be handled the same way as the corresponding view. Hence, there should be no benefit from using a derived table over a view.

Øystein Grøvlen,
Senior Principal Software Engineer,
MySQL Group, Oracle,
Trondheim, Norway

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