On 27 May 2014 07:42, Greg Stark <st...@mit.edu> wrote: > On Tue, May 27, 2014 at 10:07 AM, Heikki Linnakangas > <hlinnakan...@vmware.com> wrote: >> >> On 05/26/2014 02:26 PM, Greg Stark wrote: >>> >>>> Another idea would be to have separate checkpoints for each buffer >>> partition. You would have to start recovery from the oldest checkpoint of >>> any of the partitions. >> >> Yeah. Simon suggested that when we talked about this, but I didn't >> understand how that works at the time. I think I do now. The key to making >> it work is distinguishing, when starting recovery from the latest >> checkpoint, whether a record for a given page can be replayed safely. I used >> flags on WAL records in my proposal to achieve this, but using buffer >> partitions is simpler. > > Interesting. I just thought of it independently.
Actually, I heard it from Doug Tolbert in 2005, based on how another DBMS coped with that issue. -- Simon Riggs 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
