Really really slow query. What's a better way?

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От Brendan Duddridge
Тема Really really slow query. What's a better way?
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Msg-id 1831440F-F848-471D-ACE9-F84CE9F4E359@clickspace.com
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Ответы Re: Really really slow query. What's a better way?  (Christopher Kings-Lynne <chriskl@familyhealth.com.au>)
Список pgsql-performance
Hi,

We're executing a query that has the following plan and we're wondering given the size of the data set, what's a better way to write the query? It's been running since 2pm 2 days ago.

explain DELETE FROM cds.cds_mspecxx WHERE ProdID not in (SELECT stage.ProdID FROM cds_stage.cds_Catalog stage where stage.countryCode = 'us') and countryCode = 'us';
QUERY PLAN 
---------------------------------------------------------------------------------------------------
Index Scan using pk_mspecxx on cds_mspecxx (cost=53360.87..208989078645.48 rows=7377879 width=6)
Index Cond: ((countrycode)::text = 'us'::text)
Filter: (NOT (subplan))
SubPlan
-> Materialize (cost=53360.87..77607.54 rows=1629167 width=12)
-> Seq Scan on cds_catalog stage (cost=0.00..43776.70 rows=1629167 width=12)
Filter: ((countrycode)::text = 'us'::text)
(7 rows)

Thanks,

____________________________________________________________________
Brendan Duddridge | CTO | 403-277-5591 x24 |  brendan@clickspace.com

ClickSpace Interactive Inc.
Suite L100, 239 - 10th Ave. SE
Calgary, AB  T2G 0V9

http://www.clickspace.com 

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