diff --git a/README.md b/README.md
index 478dd40..f88ac52 100644
--- a/README.md
+++ b/README.md
@@ -41,13 +41,14 @@ export OSM_PLANET_URL=https://download.geofabrik.de/europe/monaco-latest.osm.pbf
 #export OSM_PLANET_URL=https://download.geofabrik.de/europe/france-latest.osm.pbf
 
 # Espagne
+#export CACHE_SIZE=2000
 #export OSM_PLANET_URL=http://download.geofabrik.de/europe/spain-latest.osm.pbf
 
 # Côte d'ivoire
 #export OSM_PLANET_URL=https://download.geofabrik.de/africa/ivory-coast-latest.osm.pbf
 
 # Monde entier
-#export CACHE_SIZE=20000
+#export USE_FLAT_NODES=1
 #export OSM_PLANET_URL=https://planet.openstreetmap.org/pbf/planet-latest.osm.pbf
 
 bash osm2pgsql/import.sh
@@ -81,7 +82,7 @@ bash import.sh
 
 ## TODO
 
-* Ajouter une option `USE_CACHE_NODES` à false par défaut
+* Ajouter une option `USE_FLAT_NODES` à false par défaut
 * Créer un utilisateur "osmrw" et un utilisateur "osmro"
 * Vérifier la possibilité de faire le lien avec un serveur de tuile (invalidation des tuiles)
 
diff --git a/import.sh b/import.sh
index c5e807f..cdafc43 100644
--- a/import.sh
+++ b/import.sh
@@ -10,18 +10,45 @@ OSM_STYLES_DIR=${SCRIPT_DIR}/styles
 OSM_CARTO_DIR=${OSM_STYLES_DIR}/openstreetmap-carto
 
 #--------------------------------------------------------------
-# Handle params
+# Handle import / update options
 #--------------------------------------------------------------
 OSM_DATA_DIR=${OSM_DATA_DIR:-${SCRIPT_DIR}/data}
+# optionnal
+OSM_FLAT_NODES_PATH=${OSM_DATA_DIR}/nodes.raw
 
 PGDATABASE=${PGDATABASE:-osm}
 echo "[INFO] PGDATABASE=${PGDATABASE}"
 
+# handle cache options
+CACHE_SIZE=${CACHE_SIZE:-2000}
+echo "[INFO] CACHE_SIZE=${CACHE_SIZE}"
+OPTS_CACHE="--cache=$CACHE_SIZE"
+
+USE_FLAT_NODES=${USE_FLAT_NODES:-0}
+echo "[INFO] USE_FLAT_NODES=${USE_FLAT_NODES}"
+if [ "$USE_FLAT_NODES" != "0" ];
+then
+    OPTS_CACHE="--flat-nodes ${OSM_FLAT_NODES_PATH} --cache=0"
+fi
+
+echo "[DEBUG] OPTS_CACHE=${OPTS_CACHE}"
+
+#--------------------------------------------------------------
+# Handle import specific options
+#--------------------------------------------------------------
+
 OSM_PLANET_URL=${OSM_PLANET_URL:-https://download.geofabrik.de/europe/monaco-latest.osm.pbf}
 echo "[INFO] OSM_PLANET_URL=${OSM_PLANET_URL}"
 
-CACHE_SIZE=${CACHE_SIZE:-2000}
-echo "[INFO] CACHE_SIZE=${CACHE_SIZE}"
+FORCE_DOWNLOAD=${FORCE_DOWNLOAD:-0}
+echo "[INFO] FORCE_DOWNLOAD=${FORCE_DOWNLOAD}"
+
+#--------------------------------------------------------------
+# Create osm database
+#--------------------------------------------------------------
+createdb $PGDATABASE
+CREATE_DB=${CREATE_DB:-1}
+echo "[INFO] CREATE_DB=${CREATE_DB}"
 
 #--------------------------------------------------------------
 # Create osm database
@@ -50,7 +77,15 @@ python3 "scripts/get-external-data.py" \
 # Download OSM data
 #--------------------------------------------------------------
 mkdir -p $OSM_DATA_DIR
-wget -O "$OSM_DATA_DIR/osm.pbf" $OSM_PLANET_URL
+if [ ! -e "$OSM_DATA_DIR/osm.pbf" ] || [ "$FORCE_DOWNLOAD" != "0" ] ;
+then
+    wget -O "$OSM_DATA_DIR/osm.pbf" $OSM_PLANET_URL
+fi
+
+#--------------------------------------------------------------
+# Remove existing flat-nodes
+#--------------------------------------------------------------
+rm -rf "${OSM_FLAT_NODES_PATH}"
 
 #--------------------------------------------------------------
 # Import OSM file to PostgreSQL
@@ -61,7 +96,8 @@ osm2pgsql \
     --slim \
     --hstore \
     --multi-geometry \
-    --cache=$CACHE_SIZE \
+    --log-progress=true \
+    ${OPTS_CACHE} \
     --style="${OSM_CARTO_DIR}/openstreetmap-carto.style" \
     --tag-transform-script="${OSM_CARTO_DIR}/openstreetmap-carto.lua" \
     "$OSM_DATA_DIR/osm.pbf"
diff --git a/update.sh b/update.sh
index d63e64f..1d4c049 100644
--- a/update.sh
+++ b/update.sh
@@ -10,13 +10,28 @@ OSM_STYLES_DIR=${SCRIPT_DIR}/styles
 OSM_CARTO_DIR=${OSM_STYLES_DIR}/openstreetmap-carto
 
 #--------------------------------------------------------------
-# Handle params
+# Handle import / update options
 #--------------------------------------------------------------
+OSM_DATA_DIR=${OSM_DATA_DIR:-${SCRIPT_DIR}/data}
+# optionnal
+OSM_FLAT_NODES_PATH=${OSM_DATA_DIR}/nodes.raw
 
 PGDATABASE=${PGDATABASE:-osm}
+echo "[INFO] PGDATABASE=${PGDATABASE}"
 
+# handle cache options
 CACHE_SIZE=${CACHE_SIZE:-2000}
 echo "[INFO] CACHE_SIZE=${CACHE_SIZE}"
+OPTS_CACHE="--cache=$CACHE_SIZE"
+
+USE_FLAT_NODES=${USE_FLAT_NODES:-0}
+echo "[INFO] USE_FLAT_NODES=${USE_FLAT_NODES}"
+if [ "$USE_FLAT_NODES" != "0" ];
+then
+    OPTS_CACHE="--flat-nodes ${OSM_FLAT_NODES_PATH} --cache=0"
+fi
+
+echo "[INFO] OPTS_CACHE=${OPTS_CACHE}"
 
 #--------------------------------------------------------------
 # Download openstreetmap-carto if required
@@ -34,6 +49,8 @@ osm2pgsql-replication update --verbose -- \
     --slim \
     --hstore \
     --multi-geometry \
-    --cache=$CACHE_SIZE \
+    --log-progress=true \
+    ${OPTS_CACHE} \
     --style="${OSM_CARTO_DIR}/openstreetmap-carto.style" \
     --tag-transform-script="${OSM_CARTO_DIR}/openstreetmap-carto.lua"
+