Re: Snapshot backups - Mailing list pgsql-general
Thank you Tom! This is what I was after!
So, to get this straight in my head.
- pg_start_backup forces a checkpoint and writes the information from this checkpoint to the backup_label file
- <snapshot>
- pg_stop_backup removes the backup_label file
- <disaster!>
- <restore snapshot>
- Database starts and determines where to start WAL replay from the backup_label NOT from pg_control (as usual)
Cheers,
James
James Sewell
PostgreSQL Team Lead / Solutions Architect
_____________________________________
On Wed, Jul 31, 2013 at 10:24 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
Alban Hertroys <haramrae@gmail.com> writes:As long as the OS+hardware honors the contract of fsync(), everything's
> That begs the question what happens in case of a crash or (worse) a partial crash when multiple file systems are involved.
fine. If the storage system loses data that it claims to have fsync'd to
stable storage, there's not much we can do about that, except recommend
that you have a backup plan.
In practice, the more complicated your storage infrastructure is, the more
likely it is to have bugs ...
regards, tom lane
The contents of this email are confidential and may be subject to legal or professional privilege and copyright. No representation is made that this email is free of viruses or other defects. If you have received this communication in error, you may not copy or distribute any part of it or otherwise disclose its contents to anyone. Please advise the sender of your incorrect receipt of this correspondence.
Attachment
pgsql-general by date: