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Why the creation of spatial indexes decrease the performance of a query? - Mailing list pgsql-general

From	hmidi slim
Subject	Why the creation of spatial indexes decrease the performance of a query?
Date	December 6, 2017 21:26:34
Msg-id	CAMsqVxumjVtB9+iMOLcFbsnuhnA+y-9zgOJLpV8SPo_qr0S=vA@mail.gmail.com Whole thread Raw
List	pgsql-general

Hi,

I'm using postgresql 9.6.4 on linux and I'm trying to execute this query on a table contains 51000 rows.

and I got this query plan:

Creation of index:

I get this queryPlan:

Why the execution time increases when creating a spatial index on a table containing a large amount of data?

From: Magnus Hagander
Date: 06 December 2017, 21:00:21
Subject: Re: a back up question

From: John R Pierce
Date: 07 December 2017, 00:53:22
Subject: Re: Does Postgresql 10 query partitions in parallel?