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From: Dimitrios Apostolou <[email protected]>
To: Adrian Klaver <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: [email protected]
Subject: Re: TRUNCATE ONLY with foreign keys and triggers disabled
Date: Mon, 14 Apr 2025 17:20:36 +0200 (CEST)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Mon, 14 Apr 2025, Adrian Klaver wrote:

> On 4/14/25 08:07, Laurenz Albe wrote:
>>  On Mon, 2025-04-14 at 17:05 +0200, Dimitrios Apostolou wrote:
>>>  I meant the *referencing* table has just been
>>>  populated. I'm trying to delete the *referenced* table and I get the
>>>  error.
>>
>>  That would break the foreign key constraint, right?
>>  PostgreSQL cannot allow that.
>
> I believe the OP is disabling all triggers including system ones if I follow
> correctly and possibly running a foul of;
>
> https://www.postgresql.org/docs/current/sql-altertable.html
>
> " Disabling or enabling internally generated constraint triggers requires
> superuser privileges; it should be done with caution since of course the
> integrity of the constraint cannot be guaranteed if the triggers are not
> executed."

Exactly that. I learned this from pg_restore --disable-triggers, as a way
to speed-up insertion.

Since triggers are disabled, I assumed that postgresql shouldn't care
about referential integrity in TRUNCATE.


Dimitris

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