ables.
        If this value is specified without units, it is taken as blocks,
        that is <code class="symbol">BLCKSZ</code> bytes, typically 8kB.
        The default is eight megabytes (<code class="literal">8MB</code>).
        (If <code class="symbol">BLCKSZ</code> is not 8kB, the default value scales
        proportionally to it.)
        This setting can be changed within individual
        sessions, but only before the first use of temporary tables
        within the session; subsequent attempts