Re: libpq pipelineing

From: Stephen Frost <sfrost(at)snowman(dot)net>
To: Samuel Williams <space(dot)ship(dot)traveller(at)gmail(dot)com>
Cc: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: libpq pipelineing
Date: 2020-06-29 13:55:06
Message-ID: 20200629135506.GX3125@tamriel.snowman.net
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Greetings,

* Samuel Williams (space(dot)ship(dot)traveller(at)gmail(dot)com) wrote:
> Here is a short example:
>
> https://gist.github.com/ioquatix/2f08f78699418f65971035785c80cf18
>
> It makes 10 queries in one "PQsendQuery" and sets single row mode. But
> all the results come back at once as shown by the timestamps.

If you have 10 queries that you want to make in a given transaction and
you care about the latency then really the best option is to wrap that
all in a single pl/pgsql function on the server side and make one call.

> Next I'm planning to investigate streaming large recordsets to see if
> it works better/incrementally.

If you want to stream large data sets to/from PG, you should consider
using COPY.

Thanks,

Stephen

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