On Wed, Mar 27, 2013 at 10:15 AM, Andres Freund <and...@2ndquadrant.com> wrote: > 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.
Hmm. Cool. But, wouldn't the hard part be to figure out where to start reading the WAL in search of the *latest* FPI? -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers