On Fri, Jan 6, 2012 at 9:44 PM, Robert Haas <robertmh...@gmail.com> wrote:
>> Writing pages during recovery doesn't need WAL. If we crash, we replay >> using the already generated WAL. > > Which is all fine, except when you start making changes that are not > WAL-logged. Then, you have the same torn page problem that exists > when you it in normal running. Yes, of course. My point is that this is not a blocker to using checksums, only that some actions cannot occur on the standby but the replay of changes is not in danger. page_checksums is an optional parameter, so you can turn it on or off on the standby as you wish. People frequently have a standby dedicated to HA and other standbys for queries. So this is all normal and natural. page_checksums will default to 'off' in the final patch anyway, in my understanding. -- 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
