| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
| Cc: | Kevin Grittner <kgrittn(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: emergency outage requiring database restart |
| Date: | 2016-10-21 19:02:50 |
| Message-ID: | 20161021190250.uytx63itjo4e6per@alvherre.pgsql |
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| Lists: | pgsql-hackers |
Merlin Moncure wrote:
> OK, I have some good (very- in the specific case of yours truly) news
> to report. Doing a filesystem level copy to a test server I was able
> to relfilenode swap one of the critical tables over the place of the
> refilenode of the stored backup. Not being able know the file to copy
> from, I figured out the source node by judging the size and using
> 'strings' utility. Data recovery for that table at least appears to
> be 100%.
FWIW you can use pg_filedump and match based on the number of columns.
I suppose you could also use the pageinspect extension, by 'dd'ing a
page from the file into the database and feeding into heap_page_items as
bytea.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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