| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Jim Nasby <jim(at)nasby(dot)net> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Fabrízio Mello <fabriziomello(at)gmail(dot)com>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: GSoC proposal - "make an unlogged table logged" |
| Date: | 2014-04-01 17:58:22 |
| Message-ID: | 20140401175822.GF3750@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2014-04-01 12:56:04 -0500, Jim Nasby wrote:
> On 3/4/14, 8:50 AM, Andres Freund wrote:
> >Can't that be solved by just creating the permanent relation in a new
> >relfilenode? That's equivalent to a rewrite, yes, but we need to do that
> >for anything but wal_level=minimal anyway.
>
> Maybe I'm missing something, but doesn't this actually involve writing the data twice? Once into WAL and again into the relation itself?
Yes. But as I said, that's unavoidable for anything but
wal_level=minimal. If somebody wants to put in the additional nontrivial
work to make it work faster with wal_level=minimal, they can do so. But
the other case is more general and needs to be done anyway.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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