 to change the value will
        have no effect on that session.
       </p><p>
        A session will allocate temporary buffers as needed up to the limit
        given by <code class="varname">temp_buffers</code>.  The cost of setting a large
        value in sessions that do not actually need many temporary
        buffers is only a buffer descriptor, or about 64 bytes, per
        increment in <code class="varname">temp_buffers</code>.  However if a buffer is
        actually used an additional 8192 by