Logical replication requires several configuration options to be set.
On the publisher side,
must be set to
max_replication_slots must be set to
at least the number of subscriptions expected to connect, plus
some reserve for table synchronization. And
max_wal_senders should be set to at least the
the number of physical replicas that are connected at the same
The subscriber also requires the
max_replication_slots to be set. In this case it
should be set to at least the number of subscriptions that will
be added to the subscriber.
max_logical_replication_workers must be set to
at least the number of subscriptions, again plus some reserve for
the table synchronization. Additionally the
max_worker_processes may need to be adjusted to
accommodate for replication workers, at least (
1). Note that some extensions and parallel
queries also take worker slots from
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