I've setup a master / slave Postgresql (13.4) group, 1 master and 1 slave, using
WAL warm standby.
But, due to some reason, the slave is out of sync for a while, then due to the
WAL file not exists anymore on the master, the slave can't sync anymore.
A. Is there anyway to recover the slave, to get back to sync ?
B. Or is there anyway to re-create the slave without stop the running master?
Either A or B is acceptable.