Message-ID: <8dcc13eb-d5a4-4af4-a00e-4470872aa853@dunslane.net>
Date: Mon, 10 Jun 2024 10:51:42 -0400
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: Non-text mode for pg_dumpall
To: Nathan Bossart <nathandbossart@gmail.com>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
References: <cb103623-8ee6-4ba5-a2c9-f32e3a4933fa@dunslane.net>
 <ZmcKMF61K4Ck51dK@nathan>
From: Andrew Dunstan <andrew@dunslane.net>
Content-Language: en-US
Autocrypt: addr=andrew@dunslane.net; keydata=
 xsBNBE7KWFkBCAClridxur2AIc7eW2AR7izbfp3EnNefie2HbLF0izW5Ik5UjX2HBXBx4syI
 gY6b0ugohXrr274+baoAlvSbq6cAoQuEVrk5IZFzt20b1Xkx65FwGSEj526yiKLocqkJceSq
 Xr9xcA5SGY+FZv441chh5SU92v4q6z+6LPpoHOh97ptAVXZYNTtU0LevyvD5lja0TzbvJm6C
 eFXitJfnm1pLEr0DGJCR/iUOl/N62Kh4855zZC7NHIjQHPOvV5Stz/l5ilDhvGVk+xkXFPys
 SjZoUr1rXhYLpiyi5sR0X9FHXT0KnGuz1F5ERO7ZTLSSQ6fJwPj6gOk9K+vvoKvoeql5ABEB
 AAHNJEFuZHJldyBEdW5zdGFuIDxhbmRyZXdAZHVuc2xhbmUubmV0PsLAmwQTAQgARQIbAwIX
 gAIZAQULCQgHAgMiAgEGFQoJCAsCBBYCAwECHgcWIQTkPlhGHfx8v0RpFaWZ+n/LWfw7gQUC
 ZFlxxwUJGVGAbgAKCRCZ+n/LWfw7gXikB/9ZdcUy6CTBFIIuL/bVsc1eLEW/gJBjJBF6HxNY
 xgEkAgXAp4Lg4A5U+QB9GouFr7+GYxF0BU4hzoGhNPUWltxnHdMWP8nC/38LAqgMi8L/bbsm
 HW5YPBdWYaAZAPJQVfOAgjTbRUb26KSprpyrrJKW0ZmrZfjhNPcQ72jpWzoPLQqx2X6B0fru
 1jq+cBh8lb6r1mJTim1T3JIn+F/v5VpdQS+EL8xqsHkfzKjIPsW3CIXpkypSk6saA55Rkkbl
 26AW8ftPVB0Q6Lnn6FLt9CP0MGNixBQ55yq8r1K+nCBvCCjvQjM8RDm0UUum0WNl+ifQgTLO
 E8TWEnwVtkBf+3QWzsBNBE7KWFkBCADRnOM0FCzsYW6jtncg+dWIagjUZpvaClmqn/sJluLa
 Q3v1VXMQJzYs3eC1gh386W+XBwLRpDj3jzH81lX+p73Re3d3oJW7X+ffsxuzu5ZVdMUkqBYo
 nkAbKxr6gyJ12F/+JkUVzLcoTN+d/7YsQvUVi7NaKH8mJgjz112O4fUe3p9wfAaFa0RXHc5S
 GPzRTYRRlv/XZBIho4J2tkZOnteZJZ+GbxQVlINt6fd8P6al3MWOvpP/ExJPguEfjOsO6Njy
 xjo3WfpD4lHMOR/Oc3/8mScEF84rF2jXbsFgelWnbPWAvXY+pD0dXOFRkagGmC/viwBDqq5b
 5tk76kKmUbZxABEBAAHCwHwEGAEIACYCGwwWIQTkPlhGHfx8v0RpFaWZ+n/LWfw7gQUCZFlx
 5wUJGVGAjgAKCRCZ+n/LWfw7gf+iB/4g8CPY5jihf5r/8EsoIGe2H+dpVmpPF8YGBzTIvCz/
 fQoOq8AX/pE76QEuFnFZWfjw+wgBXgCVmkox2Eflkk6z4ND3pcwGZ6CfCxTQCDk/dij+2DQ4
 6bmDCy/sBgcbz9mTpoLC11HLoPae6YN9nBNQRZDcEFEu54OaVOqlIdbA6m+POIBCXZdHOFc0
 WoDTgxHRzC1jgQNidyd6tKqcsVJs0dzF0oKTmFFmUAqTdJO12LBuNA1rlqrR3EtpYk8B/wtS
 5dIMD7Q8hwQpL+4C6GNpb6ZKnPkLi47pDOLhz2qBrqN+rqUEsT3YnExYpzj5yOBi+FlmV1Hw
 49QYe1sn2ZPs
In-Reply-To: <ZmcKMF61K4Ck51dK@nathan>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Archived-At: <https://www.postgresql.org/message-id/8dcc13eb-d5a4-4af4-a00e-4470872aa853%40dunslane.net>
Precedence: bulk


On 2024-06-10 Mo 10:14, Nathan Bossart wrote:
> On Mon, Jun 10, 2024 at 08:58:49AM -0400, Andrew Dunstan wrote:
>> Tom and Nathan opined recently that providing for non-text mode for
>> pg_dumpall would be a Good Thing (TM). Not having it has been a
>> long-standing complaint, so I've decided to give it a go.
> Thank you!
>
>> I think we would need to restrict it to directory mode, at least to begin
>> with. I would have a toc.dat with a different magic block (say "PGGLO"
>> instead of "PGDMP") containing the global entries (roles, tablespaces,
>> databases). Then for each database there would be a subdirectory (named for
>> its toc entry) with a standard directory mode dump for that database. These
>> could be generated in parallel (possibly by pg_dumpall calling pg_dump for
>> each database). pg_restore on detecting a global type toc.data would restore
>> the globals and then each of the databases (again possibly in parallel).
> I'm curious why we couldn't also support the "custom" format.


We could, but the housekeeping would be a bit harder. We'd need to keep 
pointers to the offsets of the per-database TOCs (I don't want to have a 
single per-cluster TOC). And we can't produce it in parallel, so I'd 
rather start with something we can produce in parallel.


cheers


andrew

--
Andrew Dunstan
EDB: https://www.enterprisedb.com