On Tue, 2010-09-07 at 10:47 -0400, Tom Lane wrote: > Simon Riggs <si...@2ndquadrant.com> writes: > > On Tue, 2010-09-07 at 09:27 +0300, Heikki Linnakangas wrote: > >> For the sake of argument, yes that's what I was thinking. Now please > >> explain how *you're* thinking it should work. > > > The WAL is sent from master to standby in 8192 byte chunks, frequently > > including multiple commits. From standby, one reply per chunk. If we > > need to wait for apply while nothing else is received, we do. > > That premise is completely false. SR does not send WAL in page units. > If it did, it would have the same performance problems as the old > WAL-file-at-a-time implementation, just with slightly smaller > granularity.
There's no dependence on pages in that proposal, so don't understand. What aspect of the above would you change? and to what? -- Simon Riggs www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Training and Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
