| From: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Maksim Milyutin <milyutinma(at)gmail(dot)com> |
| Subject: | Re: [HACKERS] Proposal: Local indexes for partitioned table |
| Date: | 2018-01-04 19:20:23 |
| Message-ID: | 20180104192023.pylv7jveepit2245@alvherre.pgsql |
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| Lists: | pgsql-hackers |
Robert Haas wrote:
> On Thu, Jan 4, 2018 at 11:44 AM, Peter Eisentraut
> <peter(dot)eisentraut(at)2ndquadrant(dot)com> wrote:
> > I'm not sure why this feature of automatically picking up matching
> > indexes even exists. Is it for some specific workflows or upgrade
> > scenarios? It's kind of a surprising feature in a way.
>
> It allows you to avoid building a new indexes unnecessarily when
> attaching a partition.
Yeah -- this is important to reduce the duration of the DDL operation,
since attaching a partition requires an access exclusive lock. Having
to build the index at that point would make that feature pretty much
useless for many use cases.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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