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Re: Pg_upgrade speed for many tables

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>,Magnus Hagander <magnus(at)hagander(dot)net>,PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Pg_upgrade speed for many tables
Date: 2012-11-05 21:22:59
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Mon, Nov  5, 2012 at 04:14:47PM -0500, Robert Haas wrote:
> On Mon, Nov 5, 2012 at 4:07 PM, Jeff Janes <jeff(dot)janes(at)gmail(dot)com> wrote:
> > Or have options for pg_dump and pg_restore to insert "set
> > synchronous_commit=off" into the SQL stream?
> It would be kind of neat if we had a command that would force all
> previously-asynchronous commits to complete.  It seems likely that
> very, very few people would care about intermediate pg_dump states, so
> we could do the whole dump asynchronously and then do "FORCE ALL
> COMMITS;" or whatever at the end.

Actually, I had assumed that a session disconnection forced a WAL fsync
flush, but now I doubt that.  Seems only server shutdown does that, or a
checkpoint.  Would this work?

	SET synchronous_commit=on;
	CREATE TABLE dummy(x int);
	DROP TABLE dummy;

  Bruce Momjian  <bruce(at)momjian(dot)us>

  + It's impossible for everything to be true. +

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