Re: Proposal for Allow postgresql.conf values to be changed via SQL [review]

Alvaro Herrera <alvherre@2ndquadrant.com>

From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Greg Smith <greg@2ndQuadrant.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Greg Stark <stark@mit.edu>, Amit Kapila <amit.kapila@huawei.com>, Andres Freund <andres@2ndquadrant.com>, Boszormenyi Zoltan <zb@cybertec.at>, pgsql-hackers@postgresql.org
Date: 2013-03-21T19:17:54Z
Lists: pgsql-hackers
Greg Smith escribió:
> On 3/21/13 2:38 PM, Robert Haas wrote:
> >Also, while I think that MOST people will probably want a SIGHUP right
> >after SET PERSISTENT, I am not sure that EVERYONE will want that.  If
> >you want it and it doesn't happen automatically, you can always do it
> >by hand.
> 
> This is a fair position, and since that's how the feature as written
> right now works that helps.  I think proceeding this way needs to
> hand some sort of hint back to the user though, telling them the
> change isn't active until SIGHUP.  The path I don't want to see if
> where someone uses SET PERSISTENT and can't figure out why nothing
> changed.  It should be as obvious as we can make it to someone that
> the explicit reload is necessary.

Maybe add some syntax to prevent the SIGHUP for the rare case where that
is wanted, say

SET PERSISTENT (reload=off) var=val;

(perhaps WITH at the end, dunno)

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