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in some complex stored procedure we use view and left join on this view. It takes 40 sec to execute.
Now, if we create TABLE variable and store in it result of view, then do the left join on this variable and not on the view, it takes 3 sec…
What can explain this behavior?
The view expands into the main query. S
So if you have 5 tables in the view, these expand with the extra table into one big query plan with 6 tables. The performance difference will most likely be caused by added complexity and permutations of the extra table you left join with.
Another potential issue: Do you then left join on a column that has some processing on it? This will further kill performance.