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>47.8. Synchronous Replication Support for Logical Decoding</A
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>    Logical decoding can be used to build
    <A
HREF="warm-standby.html#SYNCHRONOUS-REPLICATION"
>synchronous
    replication</A
> solutions with the same user interface as synchronous
    replication for <A
HREF="warm-standby.html#STREAMING-REPLICATION"
>streaming
    replication</A
>.  To do this, the streaming replication interface
    (see <A
HREF="logicaldecoding-walsender.html"
>Section 47.3</A
>) must be used to stream out
    data. Clients have to send <TT
CLASS="LITERAL"
>Standby status update (F)</TT
>
    (see <A
HREF="protocol-replication.html"
>Section 51.3</A
>) messages, just like streaming
    replication clients do.
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>Note: </B
>     A synchronous replica receiving changes via logical decoding will work in
     the scope of a single database. Since, in contrast to
     that, <TT
CLASS="PARAMETER"
>synchronous_standby_names</TT
> currently is
     server wide, this means this technique will not work properly if more
     than one database is actively used.
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