<p>I found how to. I tested locally with this command:</p>
<p><code>osm2pgsql --username mdione --database gis --cache 1024 --number-processes 4 --verbose \ --slim --flat-nodes /home/mdione/src/projects/osm/nodes.cache --hstore \ --multi-geometry --style /home/mdione/src/projects/osm/openstreetmap-carto.style --tag-transform-script /home/mdione/src/projects/osm/openstreetmap-carto.lua \ --drop</code></p>
<p>And it works, the file <code>nodes.cache</code> is deleted after <code>Going over pending relations...</code>, which frees a lot of space for indexing.</p>

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