Re: Using system tables directly takes many hours, using temp tables with no indexes takes a few seconds for geometry_columns view.

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От	Justin Pryzby
Тема	Re: Using system tables directly takes many hours, using temp tables with no indexes takes a few seconds for geometry_columns view.
Дата	23 марта 2022 г. 13:19:21
Msg-id	20220323131921.GR28503@telsasoft.com обсуждение исходный текст
Ответ на	Using system tables directly takes many hours, using temp tables with no indexes takes a few seconds for geometry_columns view. (Lars Aksel Opsahl <Lars.Opsahl@nibio.no>)
Ответы	Re: Using system tables directly takes many hours, using temp tables with no indexes takes a few seconds for geometry_columns view. Re: Using system tables directly takes many hours, using temp tables with no indexes takes a few seconds for geometry_columns view.
Список	pgsql-performance

Дерево обсуждения

On Wed, Mar 23, 2022 at 09:44:09AM +0000, Lars Aksel Opsahl wrote:
> Why is temp tables with no indexes much faster system tables with indexes ?

I think the "temp table" way is accidentally faster due to having no
statistics, not because it has no indexes.  If you run ANALYZE, you may hit the
same issue (or, maybe you just need to VACUUM ANALYZE your system catalogs).

-- 
Justin

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Re: Using system tables directly takes many hours, using temp tables with no indexes takes a few seconds for geometry_columns view.