From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Jesper Pedersen <jesper.pedersen@redhat.com>
Cc: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>
Cc: Pg Hackers <pgsql-hackers@postgresql.org>
Subject: Re: partitioned tables referenced by FKs
Date: Fri, 29 Mar 2019 12:22:39 -0300
Message-ID: <20190329152239.GA29258@alvherre.pgsql> (raw)
In-Reply-To: <b57809cd-3f7a-57ed-5085-560a80509824@redhat.com>
On 2019-Mar-29, Jesper Pedersen wrote:
> Could expand a bit on the change to DEPENDENCY_INTERNAL instead of
> DEPENDENCY_PARTITION_PRI / DEPENDENCY_PARTITION_SEC ?
The PARTITION dependencies work in a way that doesn't do what we want.
Admittedly, neither does INTERNAL, but at least it's less bad.
> If you run "DROP TABLE t2_p32 CASCADE" the foreign key constraint is removed
> from all of t1.
Yes. CASCADE is always a dangerous tool; if you run the DROP partition
without cascade, it explicitly lists that the constraint is going to be
dropped.
If you get in the habit of added CASCADE to all your drops, you're going
to lose data pretty quickly. In this case, no data is lost, only a
constraint.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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: pgsql-hackers@postgresql.org
Cc: alvherre@2ndquadrant.com, jesper.pedersen@redhat.com, Langote_Amit_f8@lab.ntt.co.jp
Subject: Re: partitioned tables referenced by FKs
In-Reply-To: <20190329152239.GA29258@alvherre.pgsql>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox