I have two views:
- View1 (approx 0,5 million rows) – view1_id, ref_id
- View2 (approx 35,5 million rows) – view2_id, view2_view1_id
The views contain more than one table. All rows are indexed in their specific tables – so this should apply in the view as well(?)
The queries are very slow (~4 minutes) for the following examples (querying view1 returns only 8 rows).
Select via join:
select * from view2 join view1 on view1_id = view2_view1_id where ref_id = 123
Select via CTE:
with x as (select * from view1 where ref_id = 123) select * from view2 where view2_view1_id in (select view1_id from x)
Fast is (~2 seconds):
select * into #x from view1 where ref_id = 123 select * from view2 where view2_view1_id in (select view1_id from #x)
How can I speed up my ‘normal’ queries above? It’s not useful to use temporary tables for every single query…
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