Re: ALTER TABLE ... NOREWRITE option

Noah Misch <noah@leadboat.com> writes:
> Acquiring the lock could still take an unpredictable amount of time.

I think there's a new GUC brewing about setting the lock timeout
separately from the statement timeout, right?

> being said, I share Tom's doubts.  The DEBUG1 messages are a sorry excuse for
> a UI, but I'm not seeing a clear improvement in NOREWRITE.

EXPLAIN ALTER TABLE would be the next step I guess. I discovered plenty
of magic tricks when working on the rewriting support for that command,
and I think exposing them in the EXPLAIN output would go a long way
towards reducing some POLA violations.

Ideally the EXPLAIN command would include names of new objects created
by the command, such as constraints and indexes.

>> My first thought is to add more detailed EXPLAIN support for
>> DDL... Although that unfortunately broadens the scope of this a tiny
>> bit.
>
> That would be ideal.

+1

Regards,
-- 
Dimitri Fontaine
http://2ndQuadrant.fr     PostgreSQL : Expertise, Formation et Support