From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
---|---|
To: | "David Wilson" <david(dot)t(dot)wilson(at)gmail(dot)com> |
Cc: | "John Smith" <sodgodofall(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: Backup/Restore of single table in multi TB database |
Date: | 2008-05-07 20:16:35 |
Message-ID: | 20080507131635.436b6085@jd-laptop |
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Lists: | pgsql-general pgsql-performance |
On Wed, 7 May 2008 16:09:45 -0400
"David Wilson" <david(dot)t(dot)wilson(at)gmail(dot)com> wrote:
> I'm fairly certain that you have to be very careful about doing simple
> file copies while the system is running, as the files may end up out
> of sync based on when each individual one is copied. I haven't done it
> myself, but I do know that there are a lot of caveats that someone
> with more experience doing that type of backup can hopefully point you
> to.
Besides the fact that it seems to be a fairly hacky thing to do... it
is going to be fragile. Consider:
(serverA) create table foo();
(serverB) create table foo();
(serverA) Insert stuff;
(serverA) Alter table foo add column;
Oops...
(serverA) alter table foo drop column;
You now have different version of the files than on serverb regardless
of the table name.
Joshua D. Drake
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