 memory to be used by logical decoding,
        before some of the decoded changes are written to local disk. This
        limits the amount of memory used by logical streaming replication
        connections. It defaults to 64 megabytes (<code class="literal">64MB</code>).
        Since each replication connection only uses a single buffer of this size,
        and an installation normally doesn't have many such connections
        concurrently (as limited by <code class="varname">max_wal_senders</code>), 