Re: TOAST table performance problem

På fredag 07. februar 2020 kl. 14:23:35, skrev Asya Nevra Buyuksoy <
ayisan1096(at)gmail(dot)com <mailto:ayisan1096(at)gmail(dot)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?

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