31.8. Configuration Settings
Logical replication requires several configuration options to be set.
On the publisher side,
wal_level 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 same as
max_replication_slots plus the number of physical replicas that are connected at the same time.
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