Logical decoding can be used to build synchronous replication
solutions with the same user interface as synchronous replication
replication. To do this, the streaming replication interface
(see Section 48.3)
must be used to stream out data. Clients have to send
Standby status update (F) (see Section 52.4)
messages, just like streaming replication clients do.
A synchronous replica receiving changes via logical decoding
will work in the scope of a single database. Since, in contrast to
is server wide, this means this technique will not work properly if
more than one database is actively used.
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