From: Adrian Ho <ml+postgresql@03s.net>
To: pgsql-admin@lists.postgresql.org
Subject: Re: TIL: In pg_dump, beware the combo of "-Fd" and "-Z"
Date: Wed, 20 Jan 2021 12:54:38 +0800
Message-ID: <249144ee-e91c-adfb-bcfa-dc1c5462e0c4@03s.net> (raw)
In-Reply-To: <267c0d6d-6a02-4c3a-b928-75472ce66de0@gmail.com>
References: <1ad81a44-b39e-5854-ba82-0bd1b61bef25@gmail.com>
<CAKFQuwYcWQP=G45=oTHkXa5f2EN_emSJbAy1chOg+hTd_wrjmg@mail.gmail.com>
<267c0d6d-6a02-4c3a-b928-75472ce66de0@gmail.com>
On 20/1/21 5:11 am, Ron wrote:
> On 1/19/21 1:55 PM, David G. Johnston wrote:
>> On Tuesday, January 19, 2021, Ron <ronljohnsonjr@gmail.com
>> <mailto:ronljohnsonjr@gmail.com>> wrote:
>>
>>
>> For a project using 9.6, I have this command backing up a database:
>> So, for the 12 project, I copied it over, removing the "0", since
>> I want these backups compressed.
>>
>>
>> The versions in use doesn’t seem pertinent to the observation - this
>> behavior hasn’t changed (at least in the docs).
>>
>>
>> Since the -Z default is "6"
>>
>>
>> It is? Where do you see this?
>
> https://www.postgresql.org/docs/12/app-pgdump.html
>
> "-Z 0..9"
> "the default is to compress at a moderate level."
>
> It doesn't say "6", but every other bit of software I've used defaults
> to level 6.
A quick look at the `pg_dump` source code indicates that:
* `-Z` requires an argument, and
* the argument is converted to an integer with the `atoi()` C function
This means that `-Z` actually took `-v` as its argument, which `atoi()`
converts to integer 0. That explains what you saw, and I'm also guessing
you did NOT get verbose output from your second command.
Best Regards,
Adrian
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To: pgsql-admin@postgresql.org
Cc: ml+postgresql@03s.net, pgsql-admin@lists.postgresql.org
Subject: Re: TIL: In pg_dump, beware the combo of "-Fd" and "-Z"
In-Reply-To: <249144ee-e91c-adfb-bcfa-dc1c5462e0c4@03s.net>
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