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Re: TOAST table performance problem - Mailing list pgsql-performance

From Andreas Joseph Krogh
Subject Re: TOAST table performance problem
Date
Msg-id VisenaEmail.24.3227de9e1532616f.1701fe0f525@tc7-visena
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In response to Re: TOAST table performance problem  (Asya Nevra Buyuksoy <ayisan1096@gmail.com>)
Responses Re: TOAST table performance problem  (MichaelDBA <MichaelDBA@sqlexec.com>)
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På fredag 07. februar 2020 kl. 14:23:35, skrev Asya Nevra Buyuksoy <ayisan1096@gmail.com>:
Sorry for the misunderstanding.
I have a table like;
CREATE TABLE zamazin
(
  paramuser_id text,
  paramperson_id integer,
  paramdata json,
  paramisdeleted boolean,
  paramactiontime timestamp without time zone
)
paramdata row size is 110KB and over.
 
When I execute this query like;
select * from zamazin
it takes 600 seconds.
But when analyze the query ;
"Seq Scan on public.zamazin  (cost=0.00..21.77 rows=1077 width=49) (actual time=0.008..0.151 rows=1077 loops=1)"
"  Output: paramuser_id, paramperson_id, paramdata, paramisdeleted, paramactiontime"
"  Buffers: shared hit=11"
"Planning time: 0.032 ms"
"Execution time: 0.236 ms"
 Why the query takes a long time, I do not understand. I assume that this relates to the TOAST structure.
 
My guess is the time is spent in the client retrieving the data, not in the DB itself. Are you on a slow network?
 
--
Andreas Joseph Krogh
CTO / Partner - Visena AS
Mobile: +47 909 56 963
 
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