On 20 Nov 2014 06:11, "John Smith" <jayzee.sm...@gmail.com> wrote: > > On 11/19/14, Michael Paquier <michael.paqu...@gmail.com> wrote: > > On Wed, Nov 19, 2014 at 8:37 AM, John Smith <jayzee.sm...@gmail.com> wrote: > >> > >> i want to setup a standby slave that listens 24/7 but only syncs when told > >> to. > >> > >> setting "pause_at_recovery_target (boolean)" in recovery.conf on slave > >> doesn't help since docs say it only "specifies whether recovery should > >> pause when the recovery target is reached." > >> > >> also "recovery_target = 'immediate'" is the only value allowed. > >> > >> i want to delay sync by a set time, hour or day. > >> > >> how? > >> http://www.postgresql.org/docs/9.3/static/recovery-target-settings.html > > > > Aren't pg_xlog_replay_pause and pg_xlog_replay_resume what you are looking > > for? > > http://www.postgresql.org/docs/devel/static/functions-admin.html#FUNCTIONS-RECOVERY-CONTROL > > -- > > Michael > > > > can i use "pg_start_backup('name');" and "pg_stop_backup();"? how > would they work ie if i stop backup, make changes to master, copy > master's /data/ to slave and restart backup, slave should catch-up > with master, right? > > is this the same if i use "pg_xlog_replay_pause()" and > "pg_xlog_replay_resume()". > > when would i use "pg_stop_backup();" over "pg_xlog_replay_pause()", > aside from user restrictions. >
These are two different functions with different purpose. pg_stop_backup marks the stop of a backup process (and not the recovery or restore process). It makes postgres flush the wal to archives and reset other stuff that pg_start_backup would have done in order to mark the begining of a backup process. What you are probably trying to do is stop at a point during recovery- either while restoring from a backup or during a recovery on a standby db. If later is your case then use the suggested pg_xlog_replay_pause. > thanks, jzs > > > -- > Sent via pgsql-general mailing list (pgsql-general@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general
