On 2013-03-27 10:06:19 -0400, Robert Haas wrote: > On Mon, Mar 18, 2013 at 4:31 PM, Greg Smith <g...@2ndquadrant.com> wrote: > > to get them going again. If the install had checksums, I could have figured > > out which blocks were damaged and manually fixed them, basically go on a > > hunt for torn pages and the last known good copy via full-page write. > > Wow. How would you extract such a block image from WAL? > > That would be a great tool to have, but I didn't know there was any > practical way of doing it today.
Given pg_xlogdump that should be doable with 5min of hacking in 9.3. Just add some hunk to write out the page to the if (config->bkp_details) hunk in pg_xlogdump.c:XLogDumpDisplayRecord. I have done that for some debugging already. If somebody comes up with a sensible & simple UI for this I am willing to propose a patch adding it to pg_xlogdump. One would have to specify the rel/file/node, the offset, and the target file. Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
