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From: Marcin Gozdalik <[email protected]>
To: Adrian Klaver <[email protected]>
Cc: [email protected]
Subject: Re: Changing locale of an existing database
Date: Tue, 17 Jun 2025 17:30:37 +0000
Message-ID: <CADu1mROP5-zURekH1gF69W3Hz3pteryM=8T4-VJWM3shKM9mKQ@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <CADu1mRP=rTC2WX=-EWqCX-CWjp9q09xxuEkK=2Se3wx1HasSkQ@mail.gmail.com>
	<[email protected]>

Around 100 DBs, ranging from 1TB to 50TB.
Initial testing showed that it takes 1.5h to dump the DB and 3h to restore
it for a DB of around 3TB.

Just recreating the indexes takes around 30 minutes on the same DBs.

I understand that pg_dump/pg_restore is the safe route but it's too slow
for me so I'd like to understand if I have any alternative.


wt., 17 cze 2025 o 16:55 Adrian Klaver <[email protected]>
napisał(a):

> On 6/17/25 09:20, Marcin Gozdalik wrote:
> > Hi
> >
> > I am using PostgreSQL 17 and would like to take advantage of performance
> > and stability across OS updates of builtin C.UTF-8 locale.
> > I have a cluster with a DB created with en_US.UTF-8 libc locale. I would
> > like to migrate the DB to C.UTF-8. Ideally there'd be an "ALTER DATABASE
> > ... SET LOCALE ..." command that would take care of it but it seems it
> > doesn't exist. I was thinking that I could change the collation of all
> > TEXT/CHAR/VARCHAR columns in all the tables to pg_c_utf8, REINDEX all
> > those columns and change the default locale in the pg_database table.
> >
> > Is it a sensible plan? Am I missing some steps? I can't find any
> > reference to anybody doing that before or discouraging it.
>
> How big a database are we talking about?
>
> To me it would seem easier to create a new database with new locale and
> do either a pg_dump/pg_restore or logical replication to the new
> instance. Of course this may depend on the answer to the question above.
>
> >
> > Thanks,
> > Marcin
> >
> > --
> > Marcin Gozdalik
>
> --
> Adrian Klaver
> [email protected]
>
>

-- 
Marcin Gozdalik

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