If this occurs, the standby will need to be reinitialized from a new base backup. I would go further in depth on how signals work, however I’ll just say that the sign can sometimes reverse, causing lack of signal to your receiver. Packages can request to be routinely rebuilt when the subslot of a runtime dependency modifications. In case you set up a WAL archive that is accessible from the standby, these solutions will not be required, for the reason that standby can all the time use the archive to catch up provided it retains sufficient segments. As extra curiosity is developed you can add to a beginner set. It is essential that the entry privileges for replication be set up so that only trusted customers can read the WAL stream, as a result of it is simple to extract privileged info from it. WAL segments are usually not recycled too early, or by configuring a replication slot for the standby.