From: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
---|---|
To: | Andres Freund <andres(at)anarazel(dot)de> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, pgsql-hackers(at)lists(dot)postgresql(dot)org |
Subject: | Re: [Proposal] Fully WAL logged CREATE DATABASE - No Checkpoints |
Date: | 2022-02-13 02:17:46 |
Message-ID: | 20220213021746.GM31460@telsasoft.com |
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Lists: | pgsql-hackers |
On Sat, Feb 12, 2022 at 06:00:44PM -0800, Andres Freund wrote:
> Hi,
>
> On 2022-02-11 16:19:12 -0500, Robert Haas wrote:
> > I somewhat hope we never end up with THREE strategies for creating a new
> > database, but now that I think about it, we might. Somebody might want to
> > use a fancy FS primitive that clones a directory at the FS level, or
> > something.
>
> I think that'd be a great, and pretty easy to implement, feature. But it seems
> like it'd be mostly orthogonal to the "WAL log data" vs "checkpoint data"
> question? On the primary / single node system using "WAL log data" with "COW
> file copy" would work well.
>
> I bet using COW file copies would speed up our own regression tests noticeably
> - on slower systems we spend a fair bit of time and space creating template0
> and postgres, with the bulk of the data never changing.
>
> Template databases are also fairly commonly used by application developers to
> avoid the cost of rerunning all the setup DDL & initial data loading for
> different tests. Making that measurably cheaper would be a significant win.
+1
I ran into this last week and was still thinking about proposing it.
Would this help CI or any significant fraction of buildfarm ?
Or just tests run locally on supporting filesystems.
Note that pg_upgrade already supports copy/link/clone. (Obviously, link
wouldn't do anything desirable for CREATE DATABASE).
--
Justin
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