On Thu, Jan 22, 2009 at 11:13 AM, Heikki Linnakangas <heikki.linnakan...@enterprisedb.com> wrote: > Simon Riggs wrote: >> On Thu, 2009-01-22 at 16:15 +0200, Heikki Linnakangas wrote: >>> >>> That might be useful. But again, could just as well be implemented as an >>> external tool like pglesslog. >> >> There is no WAL record for "no-op", at least not one of variable length. > > Hmm, maybe there should be? That seems like a useful thing to have for > external tools. > >> The WAL files can't just have chunks of zeroes in the middle of them, >> they must be CRC valid and chained together in the exact byte position. >> There isn't any way to do this, even if there were, that's a seriously >> complex way of doing that. > > Hmm, I think you could remove the records in the middle, rechain the > remaining ones, recalculate the crc, and put an xlog switch record at the > end. I agree that's seriously complicated, a no-op record would be much > simpler.
Would I be pushing my luck if I suggested that maybe a pluggable rmgr would also be much simpler, and we already have a patch for that? :-) ...Robert -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
