| From: | Florian Pflug <fgp(at)phlo(dot)org> |
|---|---|
| To: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
| Cc: | Chris Redekop <chris(at)replicon(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Hot Backup with rsync fails at pg_clog if under load |
| Date: | 2011-10-24 06:05:01 |
| Message-ID: | 86FA4083-5CD9-4AAF-BCD6-0226420DAA45@phlo.org |
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| Lists: | pgsql-hackers |
On Oct24, 2011, at 01:27 , Simon Riggs wrote:
> FATAL: could not access status of transaction 21110784
> which, in pg_subtrans, is the first xid on a new subtrans page. So we
> have missed zeroing a page.
>
> pg_control shows ... Latest checkpoint's oldestActiveXID: 21116666
> which shows quite clearly that the pg_control file is later than it should be.
But shouldn't pg_control be largely irrelevant in a hot backup scenario? Most
(all?) of the information contained therein should be overwritten with the
contents of the checkpoint referenced by the backup label, shouldn't it?
best regards,
Florian Pflug
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