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Sql Server Programming

SQL Server 2000 Views and Views containing Views

I was wondering if anyone could shed any light on this. I am using SQL Server

I start with 1 view (VIEW A) that uses a UNION statement that includes 2
queries. Each query is not too complicated (i.e. few joins but no subquery).

I then run a report and it take a long time to run.

So I decide to make 2 new views each with one query. Then I modify the
original view (VIEW A) to use a UNION statement that combines the 2 views,
rather than the queries.

This runs much faster.

I am surprised by this. Should I be? I have never been a fan of views of
view because of the admin nightmare of too many views. But it seems like
there is a performance advantage. Can this be true?

Have you tried using UNION ALL?
Union by default will remove duplicates and will slow down your select.
"Paul" <P@discussions.microsoft.com> wrote in message


Have you compared execution plans of setting #1 vs. setting #2? Therein may
the answer lie.



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