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From: "Daniel Verite" <daniel@manitou-mail.org>
Subject: Re: Will PQsetSingleRowMode get me results faster?
To: "Stijn Sanders" <stijnsanders@gmail.com>
Cc: pgsql-general@lists.postgresql.org
In-Reply-To: <CAHYFsWWPQZj4J5=AE7b=zrY31Nkff-=D8O6=tXx-MiO83K6FJg@mail.gmail.com>
Date: Mon, 06 Jan 2025 20:25:26 +0100
Message-Id: <140214eb-a8ce-4285-afdd-7770c5a9d274@manitou-mail.org>
Archived-At: <https://www.postgresql.org/message-id/140214eb-a8ce-4285-afdd-7770c5a9d274%40manitou-mail.org>
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	Stijn Sanders wrote:

> From what I notice using LibPQ, it appears a query needs to complete
> before resulting data is being transferred to the client. Please
> correct me if I'm wrong.

No, the query does not need to complete. If you run something like
"select * from bigtable" in single-row or chunked mode, you should
see that the first results are typically available immediately to the
application, while the query is far from finished.

But it depends on the query plan. A lot of queries cannot produce any
result until the final stage of their execution. For these, you can't
expect any difference in how fast the first results are available
client-side.


Best regards,
--=20
Daniel V=E9rit=E9
https://postgresql.verite.pro/
Twitter: @DanielVerite