<p><b>@woodpeck</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/osm2pgsql/pull/612#discussion_r161149918">middle-pgsql.cpp</a>:</p>
<pre style='color:#555'>> @@ -1072,7 +1072,10 @@ void middle_pgsql_t::pgsql_stop_one(table_desc *table)
 void middle_pgsql_t::stop(void)
 {
     cache.reset();
-    if (out_options->flat_node_cache_enabled) persistent_cache.reset();
+    if (out_options->flat_node_cache_enabled) {
+        persistent_cache->clean_up();
+        persistent_cache.reset();
+    }
</pre>
<p>The "normal mode" (your <a href="https://github.com/openstreetmap/osm2pgsql/pull/1" class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="1078458" data-permission-text="Issue title is private" data-url="https://github.com/openstreetmap/osm2pgsql/issues/1">#1</a>) is not updateable. Updating requires intermediate data to be persistent.</p>

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