Re: [HACKERS] Re: [HACKERS] GSoC 2015 proposal: Improve the performance of “ALTER TABLE .. SET LOGGED / UNLOGGED” statement

On Wed, Jul 8, 2015 at 10:53 AM, Andres Freund <andres@anarazel.de> wrote:
>
> On 2015-07-03 08:18:09 -0300, Fabrízio de Royes Mello wrote:
> > *** ALTER TABLE changes
> > ...
>
> Without going into the specifics of this change: Are we actually sure
> this feature warrants the complexity it'll introduce? I'm really rather
> doubtful.

Think in an ETL job that can be use an unlogged table to improve the load performance, but this job create a "large table" and to guarantee the data consistency you need to transform it into a regular table, and with the current implementation rewrite the entire heap, toast and indexes.

Regards,

--
Fabrízio de Royes Mello
Consultoria/Coaching PostgreSQL
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