<p></p>
<p dir="auto">It is in the manual: <a href="https://osm2pgsql.org/doc/manual.html#flat-node-store" rel="nofollow">https://osm2pgsql.org/doc/manual.html#flat-node-store</a></p>
<pre class="notranslate"><code class="notranslate">This should only be used on full planet imports or very large extracts (e.g. Europe) but in those situations offers significant space savings and speed increases, particularly on mechanical drives. The file takes approximately 8 bytes * maximum node ID, or more than 50 GiB, regardless of the size of the extract.
</code></pre>
<p dir="auto">I'll update the <code class="notranslate">50 GiB</code>, because they are by now outdated.</p>

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