Re: Information on savepoint requirement within transctions

From: Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
To: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Robert Zenz <robert(dot)zenz(at)sibvisions(dot)com>
Cc: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: Re: Information on savepoint requirement within transctions
Date: 2018-01-30 08:03:18
Message-ID: 1517299398.2517.4.camel@cybertec.at
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David G. Johnston wrote:
> > > It may be worth updating the docs here...
> >
> So, my first pass at this. I'm probably going a bit outside what would normally be covered in the SQL
> Command section but it does feel right at first blush.
>
> Also attached; not compiled.
>
> As a bug fix I've updated the description of "COMMIT" here since it can cause a ROLLBACK to be issued and that isn't documented.
>
> "(pseudo) sub-transaction" seemed like a reasonable choice of terminology to introduce rather than just "mark".
> Having it mentioned in context in the BEGIN docs, instead of just a "see also", should aid in understanding
> how the whole transaction system fits together. The advanced features of the tutorial cover this to some degree
> (I didn't re-read it prior to writing this up) but I'm inclined to believe people wanting to understand transactions,
> lacking a top-level chapter on the topic, will know of BEGIN and start their discovery there.

I think that it is a good idea to explain the behavior of aborted transactions.
Shouldn't that go to the hackers list though?

I don't like the term "pseudo sub-transaction". What's pseudo about it?

> +
> + <para>
> + <application>psql</application> makes use of savepoints to implment its
> + <literal>ON_ERROR_ROLLBACK</literal> behavior.
> + </para>

s/implment/implement/

Yours,
Laurenz Albe

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