| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: pg_start_backup and pg_stop_backup Re: Re: [COMMITTERS] pgsql: Make CheckRequiredParameterValues() depend upon correct |
| Date: | 2010-04-28 15:25:19 |
| Message-ID: | 4BD8535F.5080601@enterprisedb.com |
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| Lists: | pgsql-hackers |
Robert Haas wrote:
> At least as I understand it, even when not using
> archive_mode, streaming replication, or hot standby, it's still
> perfectly legal to use pg_start_backup() to take a hot backup.
Nope. The correct procedure to take a hot backup is described in
http://www.postgresql.org/docs/8.4/interactive/continuous-archiving.html#BACKUP-TIPS.
It involves setting archive_mode=on, and archive_command to a shell
command that normally just returns true, except when backup is in
progress. You can't take a hot backup without archiving (or streaming)
at least temporarily. (except with filesystem-level snapshot capabilities).
Which is unfortunate, really. I wish we had a mode where the server
simply refrained from removing/recycling WAL segments while the backup
is running. You could then just:
1. pg_start_backup()
2. tar the data directory, except for pg_xlog
3. tar pg_xlog
4. pg_stop_backup().
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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