Re: Restoring a database from a file system snapshot - Mailing list pgsql-general

From Alvaro Herrera
Subject Re: Restoring a database from a file system snapshot
Date
Msg-id 20080827183736.GE4071@alvh.no-ip.org
Whole thread Raw
In response to Restoring a database from a file system snapshot  (William Garrison <postgres@mobydisk.com>)
Responses Re: Restoring a database from a file system snapshot  (William Garrison <postgres@mobydisk.com>)
List pgsql-general
William Garrison wrote:
> I have a PostgreSQL database on Windows Server 2003, and the database is
> kept on a SAN that has the ability to make instantaneous snapshots.
> Once I have made such a snapshot, I am unclear how to re-attach it to
> another postgres database on another machine.  Postgres seems to create
> a directory structure that looks like this:
>    Z:\MyDatabase
>    Z:\MyDatabase\PG_VERSION
>    Z:\MyDatabase\1234567
>    Z:\MyDatabase\lots of files...
> The "1234567" number above changes with each new database I create.

It doesn't work.  There's a procedure for restoring files, but you need
to also save the pg_xlog files as a stream, for which you need to set up
an archive_command in postgresql.conf beforehand.  If you're interested
in this, see the "Point in time recovery" chapter in the documentation.

pg_dump/pg_restore is the easiest combination to use anyway.

--
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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