diff --git a/3m/cron.sh b/3m/cron.sh
index 09ea0d9..f5f20e3 100755
--- a/3m/cron.sh
+++ b/3m/cron.sh
@@ -5,17 +5,23 @@ set -x -e
 cd ~/publik-bi/3m/
 export PLATFORM=${PLATFORM:-prod}
 DB=auquotidien-bi
+TEMPDB=$DB-temp
 
 TEMP_DUMP=`tempfile`
 trap "rm -f $TEMP_DUMP" INT TERM EXIT
 
-/sbin/start-stop-daemon --stop --pidfile slicer-$PLATFORM.pid --oknodo --retry 5
-dropdb $DB
-createdb $DB
+dropdb $TEMPDB || true
+createdb $TEMPDB
 pg_dump -Oc auquotidien >$TEMP_DUMP
-psql $DB -f $TEMP_DUMP
-psql $DB -f 3m_$PLATFORM.sql
+psql $TEMPDB -f $TEMP_DUMP
+psql $TEMPDB -f 3m_$PLATFORM.sql
 
+# minimize downtime
+/sbin/start-stop-daemon --stop --pidfile slicer-$PLATFORM.pid --oknodo --retry 5
+psql -c "ALTER DATABASE \"$DB\" RENAME TO \"$DB-old\"" auquotidien
+psql -c "ALTER DATABASE \"$TEMPDB\" RENAME TO \"$DB\"" auquotidien
 /sbin/start-stop-daemon --start --background --make-pidfile \
    --pidfile slicer-$PLATFORM.pid --oknodo --startas ./run-slicer.sh \
    --chdir .
+
+dropdb $DB-old