Обсуждение: Confusing error message in 15.6

Hi,

I am observing the following error which confuses me:

#  psql -U postgres template1 -c "checkpoint; select pg_backup_start('${dest}.tar.Z', true)"
CHECKPOINT
 pg_backup_start
-----------------
 17BF7/3009498
(1 row)

#  psql -U postgres template1 -c "select pg_backup_stop(true)"
ERROR:  backup is not in progress
HINT:  Did you call pg_backup_start()?

This is postgresql 15.6 running on RH 7.

This is not just amusing, it is breaking my backup script after update from 11 to 15 (and change from
pg_{start,stop}_backupto pg_backup_{start_stop}) 

Thanks,
Dmitry

On Tue, May 21, 2024, 17:29 Dmitry O Litvintsev <litvinse@fnal.gov> wrote:

This is not just amusing, it is breaking my backup script after update from 11 to 15 (and change from pg_{start,stop}_backup to pg_backup_{start_stop})

Yep, nowadays you must keep the transaction where you issued backup start open until you issue backup end.  Using -c isn't going to cut it.

Oops. This means major rewrite of my backup procedure.  Thanks for pointing this out. I will likely just switch to
pg_basebackup.What I have is something old and gnarly from the days of psql version 8. 

________________________________________
From: David G. Johnston <david.g.johnston@gmail.com>
Sent: Tuesday, May 21, 2024 6:42 PM
To: Dmitry O Litvintsev
Cc: pgsql-generallists.postgresql.org
Subject: Re: Confusing error message in 15.6

[EXTERNAL] – This message is from an external sender


On Tue, May 21, 2024, 17:29 Dmitry O Litvintsev <litvinse@fnal.gov<mailto:litvinse@fnal.gov>> wrote:
Hi,

I am observing the following error which confuses me:

#  psql -U postgres template1 -c "checkpoint; select pg_backup_start('${dest}.tar.Z', true)"
CHECKPOINT
 pg_backup_start
-----------------
 17BF7/3009498
(1 row)

#  psql -U postgres template1 -c "select pg_backup_stop(true)"
ERROR:  backup is not in progress
HINT:  Did you call pg_backup_start()?

This is postgresql 15.6 running on RH 7.

This is not just amusing, it is breaking my backup script after update from 11 to 15 (and change from
pg_{start,stop}_backupto pg_backup_{start_stop}) 


Yep, nowadays you must keep the transaction where you issued backup start open until you issue backup end.  Using -c
isn'tgoing to cut it. 

David J.

On Tue, 2024-05-21 at 23:58 +0000, Dmitry O Litvintsev wrote:

> > > I am observing the following error which confuses me:
> > >
> > > #  psql -U postgres template1 -c "checkpoint; select pg_backup_start('${dest}.tar.Z', true)"
> > > CHECKPOINT
> > >  pg_backup_start
> > > -----------------
> > >  17BF7/3009498
> > > (1 row)
> > >
> > > #  psql -U postgres template1 -c "select pg_backup_stop(true)"
> > > ERROR:  backup is not in progress
> > > HINT:  Did you call pg_backup_start()?
> > >
> > > This is postgresql 15.6 running on RH 7.
> >
> > Yep, nowadays you must keep the transaction where you issued backup start open until
> > you issue backup end.  Using -c isn't going to cut it.
>
> Oops. This means major rewrite of my backup procedure.  Thanks for pointing
> this out. I will likely just switch to pg_basebackup. What I have is
> something old and gnarly from the days of psql version 8.

You could try https://github.com/cybertec-postgresql/safe-backup
to make the transition smoother.

Yours,
Laurenz Albe