debug_discard_caches

doc html

<p>
        When set to <code class="literal">1</code>, each system catalog cache entry is
        invalidated at the first possible opportunity, whether or not
        anything that would render it invalid really occurred.  Caching of
        system catalogs is effectively disabled as a result, so the server
        will run extremely slowly.  Higher values run the cache invalidation
        recursively, which is even slower and only useful for testing
        the caching logic itself.  The default value of <code class="literal">0</code>
        selects normal catalog caching behavior.
       </p><p>
        This parameter can be very helpful when trying to trigger
        hard-to-reproduce bugs involving concurrent catalog changes, but it
        is otherwise rarely needed.  See the source code files
        <code class="filename">inval.c</code> and
        <code class="filename">pg_config_manual.h</code> for details.
       </p><p>
        This parameter is supported when
        <code class="symbol">DISCARD_CACHES_ENABLED</code> was defined at compile time
        (which happens automatically when using the
        <span class="application">configure</span> option
        <code class="option">--enable-cassert</code>).  In production builds, its value
        will always be <code class="literal">0</code> and attempts to set it to another
        value will raise an error.
       </p>

documentation revision

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