5 displays perform very well - notice of 5 views running at all

I have 5 'small' views that run very well - they return all the lines (a few hundred to a few thousand) in just a few seconds. They have all the same 3 exact fields that in the view 1 should be the PK if it were a table. View #6 brings together the other 5 on these fields with left join syntax (some points of view have not all possible combinations, while others have multiple matches). Due to the multiple matches in some of the views, the large result set has a fairly high level of duplication in some columns, but we're OK with that.

The problem is that view #6 for all practical purposes does not nothing. He's right there. A small test batch ran for several days before we dropped on it. I know that complex views (views) to honor not always advice but we tried some anyway. parallel and hash join.

Experience to materialise the 5 point view to see return 6 results (and exactly as we want) in a few seconds! Unfortunately we are not allowed to use the materialization without too much red tape option that is not valid. The plan view on display indicates joins to nested loops between the 5 while the materialized view on shows hash joins, so the use of the indicator of hash join attempted nothing helps. But the difference of the join method does not seem to explain it.

We went in a another way of getting the data is attached to the need, but there are some debates and the curiosity to see if it is one approach valid. Everyone knows something like that? Is a view of multiple views, a bad idea?

Tags: Database

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