Question

I have 4 views in my MS Sql Server Database which are all quite fast (less than 2 seconds) and return all less than 50 rows.

BUT when I create a query where I join those 4 views (left outer joins) I get a query which takes almost one minute to finish.

I think the query optimizer is doing a bad job here, is there any way to speed this up. I am tempted to copy each of the 4 views into a table and join them together but this seems like too much of a workaround to me.

(Sidenote: I can’t set any indexes on any tables because the views come from a different database and I am not allowed to change anything there, so this is not an option)

EDIT: I am sorry, but I don’t think posting the sql queries will help. They are quite complex and use around 50 different tables. I cannot post an execution plan either because I don’t have enought access rights to generate an execution plan on some of the databases.

I guess my best solution right now is to generate temporary tables to store the results of each query.

Answer 1

If you can’t touch indexes, to speed up, you can put results of you 4 queries in 4 temp tables and then join them.

You can do this in a stored procedure.