Обсуждение: Switchover : WAL archiving and shutdown...
Hi, I'm setting up switchover (to another server) with WAL/PITR. But, I'm wondering what could be the behaviour of Postgresql if you shutdown the service while a new WAL archive is just ready to be copied, or if the transfer is in progress... Will the tranfer be canceled (until the next start), or will Postgresql wait for the end of the transfer before exiting ? In other words, when I want to switchover, is it sufficient to stop postgresql, and rsync the last partial WAL (the last modified one), or do I have to check if every WAL file is in sync before starting the other server ?? Thank you in advance, Philippe Ferreira
* Philippe Ferreira (phil.f@worldonline.fr) wrote: > But, I'm wondering what could be the behaviour of Postgresql if you > shutdown the > service while a new WAL archive is just ready to be copied, or if the > transfer is in > progress... > Will the tranfer be canceled (until the next start), or will Postgresql > wait for the end > of the transfer before exiting ? I'd expect the transfer to continue because it's a seperate spawned program... I don't think it'd get a signal or be killed when the parent shuts down but I'm not entirely sure. > In other words, when I want to switchover, is it sufficient to stop > postgresql, > and rsync the last partial WAL (the last modified one), or do I have to > check if > every WAL file is in sync before starting the other server ?? I think you need to rsync across all of the WALs which aren't yet archived. That could be more than 1... That's my understanding anyway. Thanks, Stephen