diff --git a/ogn/collect/database.py b/ogn/collect/database.py
index 2710d88..1a36dee 100644
--- a/ogn/collect/database.py
+++ b/ogn/collect/database.py
@@ -9,14 +9,13 @@ from ogn.collect.celery import app
 logger = get_task_logger(__name__)
 
 
-def delete_device_infos(session, address_origin):
+def update_device_infos(session, address_origin, csvfile=None):
+    device_infos = get_ddb(csvfile=csvfile, address_origin=address_origin)
+
     session.query(DeviceInfo) \
         .filter(DeviceInfo.address_origin == address_origin) \
         .delete()
-    session.commit()
 
-
-def update_device_infos(session, device_infos):
     session.bulk_save_objects(device_infos)
     session.commit()
 
@@ -30,8 +29,7 @@ def import_ddb():
     logger.info("Import registered devices fom the DDB...")
     address_origin = AddressOrigin.ogn_ddb
 
-    delete_device_infos(app.session, address_origin)
-    counter = update_device_infos(app.session, get_ddb(address_origin=address_origin))
+    counter = update_device_infos(app.session, address_origin)
     logger.info("Imported {} devices.".format(counter))
 
 
@@ -42,6 +40,5 @@ def import_file(path='tests/custom_ddb.txt'):
     logger.info("Import registered devices from '{}'...".format(path))
     address_origin = AddressOrigin.user_defined
 
-    delete_device_infos(app.session, address_origin)
-    counter = update_device_infos(app.session, get_ddb(csvfile=path, address_origin=address_origin))
+    counter = update_device_infos(app.session, address_origin, csvfile=path)
     logger.info("Imported {} devices.".format(counter))
diff --git a/ogn/commands/database.py b/ogn/commands/database.py
index aa66cd6..039e89f 100644
--- a/ogn/commands/database.py
+++ b/ogn/commands/database.py
@@ -1,6 +1,6 @@
 from ogn.commands.dbutils import engine, session
 from ogn.model import Base, AddressOrigin
-from ogn.utils import get_ddb, get_airports
+from ogn.utils import get_airports
 from ogn.collect.database import update_device_infos
 
 from manager import Manager
@@ -51,8 +51,8 @@ def import_ddb():
 
     print("Import registered devices fom the DDB...")
     address_origin = AddressOrigin.ogn_ddb
-    counter = update_device_infos(session, address_origin,
-                                  get_ddb(address_origin=address_origin))
+    counter = update_device_infos(session,
+                                  address_origin)
     print("Imported %i devices." % counter)
 
 
@@ -63,8 +63,9 @@ def import_file(path='tests/custom_ddb.txt'):
 
     print("Import registered devices from '{}'...".format(path))
     address_origin = AddressOrigin.user_defined
-    counter = update_device_infos(session, address_origin,
-                                  get_ddb(csvfile=path, address_origin=address_origin))
+    counter = update_device_infos(session,
+                                  address_origin,
+                                  csvfile=path)
     print("Imported %i devices." % counter)