public inbox for [email protected]  

help / color / mirror / Atom feed

From: David G. Johnston <[email protected]>
To: [email protected] <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: FK from logged to unlogged table?
Date: Sat, 22 Nov 2025 06:34:38 -0600
Message-ID: <CAKFQuwaWXkQ8Z5r+5n=H4JOHD4RkrxOJB6DNB0ha1qTP4u4aZQ@mail.gmail.com> (raw)
In-Reply-To: <5031a50c-aca7-4512-9478-95583606b5ff@Spark>
References: <5031a50c-aca7-4512-9478-95583606b5ff@Spark>

On Friday, November 21, 2025, <[email protected]> wrote:

> Hello,
>
> I'm looking to improve bulk write performance on a table of about 23
> million rows by setting it unlogged. If lost, the table can be re-generated
> from archived raw data. The unlogged table would be referenced from a
> different, logged, table by a sparse but very important foreign key.
>
> If the unlogged table is lost, I can repair the foreign key data by
> re-uploading the raw data and following a different unique key. However,
> this would be annoying and I would rather not have to implement it if I can
> protect the keyed records instead.
>
>    1. Is it allowed to key from a logged table to an unlogged table?
>    2. What is the system behavior if the unlogged table is lost?
>    3. Is there a clean way to protect only the subset of records that are
>    keyed? (Yes, I am considering periodic backups to an archive table, but
>    there would still be some repair needed that way).
>
>
Both 1 and 2 Feels like something you should take the couple of minutes to
try.  For 3, it’s an unlogged table - the entire thing.

David J.

view thread (2+ messages)

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: FK from logged to unlogged table?
  In-Reply-To: <CAKFQuwaWXkQ8Z5r+5n=H4JOHD4RkrxOJB6DNB0ha1qTP4u4aZQ@mail.gmail.com>

* 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