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They're expanded out into the parse tree of whatever statement references them, and the entire tree is then compiled and optimized - at the point of usage.

For indexed views, you would be largely correct - the views are maintained as part of the same transaction that performs changes in the base tables.

The SQL UPDATE VIEW command can be used to modify the data of a view.

Inserts/Updates happen to these constantly, sometimes 100's per minute. If your view returns 6 columns, but you only need four then your query is inherently inefficient due to the [email protected] - not entirely true. If you only select 4 columns from the view, the optimizer can use that information and produce a plan that would be unable to supply the other columns, if such a plan is viable. So if the tables are changing that much, maybe our system is getting overwhelmed by having to constantly play catch-up updating views. A view is essentially shorthand for using a subquery in a join. There are a number of reasons that your timeouts can be occurring; since you said timeout and not deadlock I'm assuming the inserts are being called from outside of SQL.




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