max_wal_senders

doc html

<p>
        Specifies the maximum number of concurrent connections from standby
        servers or streaming base backup clients (i.e., the maximum number of
        simultaneously running WAL sender processes). The default is
        <code class="literal">10</code>.  The value <code class="literal">0</code> means
        replication is disabled.  Abrupt disconnection of a streaming client might
        leave an orphaned connection slot behind until a timeout is reached,
        so this parameter should be set slightly higher than the maximum
        number of expected clients so disconnected clients can immediately
        reconnect.  This parameter can only be set at server start.  Also,
        <code class="varname">wal_level</code> must be set to
        <code class="literal">replica</code> or higher to allow connections from standby
        servers.
       </p><p>
         When running a standby server, you must set this parameter to the
         same or higher value than on the primary server. Otherwise, queries
         will not be allowed in the standby server.
        </p>

documentation revision

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