public inbox for [email protected]  

help / color / mirror / Atom feed

From: Tom Lane <[email protected]>
To: Chris Joysn <[email protected]>
Cc: [email protected]
Subject: Re: Very slow query performance when using CTE
Date: Tue, 01 Apr 2025 10:28:58 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAKRYhW36jEbPPSPoiPkNcPWdrEXOtdugw9Hyg1poHju7LECHJg@mail.gmail.com>
References: <CAKRYhW36jEbPPSPoiPkNcPWdrEXOtdugw9Hyg1poHju7LECHJg@mail.gmail.com>

Chris Joysn <[email protected]> writes:
> I have an issue when using CTEs. A query, which consists of multiple CTEs,
> runs usually rather fast (~5s on my environment). But it turned out that
> using one CTE can lead to execution times of up to one minute.
> That CTE is used two times within the query.

Try labeling that CTE as NOT MATERIALIZED.

			regards, tom lane

view thread (7+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected]
  Subject: Re: Very slow query performance when using CTE
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox