Re: Statement-level rollback

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com>
Subject: Re: Statement-level rollback
Date: 2018-12-08 20:55:03
Message-ID: 20181208205503.sw3ohupigf4uznwy@alvherre.pgsql
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On 2018-Dec-08, Andres Freund wrote:

> On 2018-12-08 17:10:27 -0300, Alvaro Herrera wrote:

> > This is what patch 0001 does -- it's only allowed in the connection
> > string, or on ALTER USER / ALTER DATABASE. Setting it in
> > postgresql.conf is forbidden, as well as changing from transaction to
> > statement in SET (the opposite is allowed, though.)
>
> I don't think allowing to set it on a per-user basis is acceptable
> either, it still leaves the client in a state where they'll potentially
> be confused about it.

Hmm, true.

> Do you have a proposal to address the issue that this makes it just
> about impossible to write UDFs in a safe way?

Not yet, but I'll give it a think next week.

--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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