 25%
        of the memory in your system.  There are some workloads where even
        larger settings for <code class="varname">shared_buffers</code> are effective, but
        because <span class="productname">PostgreSQL</span> also relies on the
        operating system cache, it is unlikely that an allocation of more than
        40% of RAM to <code class="varname">shared_buffers</code> will work better than a
        smaller amount.  Larger settings for <code class="varname">shared_buffers</code>
    