Robert Haas wrote:
> On Fri, Dec 15, 2017 at 5:18 PM, Alvaro Herrera <alvherre@alvh.no-ip.org> wrote:
> > We have two options for marking valid:
> >
> > 1. after each ALTER INDEX ATTACH, verify whether the set of partitions
> > that contain the index is complete; if so, mark it valid, otherwise do
> > nothing. This sucks because we have to check that over and over for
> > every index that we attach
> >
> > 2. We invent yet another command, say
> > ALTER INDEX <idx-on-parent> VALIDATE
>
> If ALTER INDEX .. ATTACH is already taking AEL on the parent, then I
> think it might as well try to validate while it's at it. But if not
> then we might want to go with #2.
The problem I have with it is that restoring a dump containing indexes
on partitions becomes a O(N^2) deal as it has to do the full check once
for every index we attach.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
