diff --git a/neutron/db/common_db_mixin.py b/neutron/db/common_db_mixin.py
deleted file mode 100644
index d0806e405df..00000000000
--- a/neutron/db/common_db_mixin.py
+++ /dev/null
@@ -1,62 +0,0 @@
-# Copyright (c) 2014 OpenStack Foundation.
-# All Rights Reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-from neutron_lib.db import model_query
-from neutron_lib.db import utils as db_utils
-
-
-# TODO(HenryG): Deprecate and schedule for removal
-class CommonDbMixin(object):
-    """Deprecated."""
-
-    @staticmethod
-    def _model_query(context, model):
-        return model_query.query_with_hooks(context, model)
-
-    @staticmethod
-    def _fields(resource, fields):
-        return db_utils.resource_fields(resource, fields)
-
-    @staticmethod
-    def _get_by_id(context, model, id):
-        return model_query.get_by_id(context, model, id)
-
-    @staticmethod
-    def _get_collection_query(context, model,
-                              filters=None, sorts=None,
-                              limit=None, marker_obj=None,
-                              page_reverse=False):
-        return model_query.get_collection_query(context, model,
-                                                filters, sorts,
-                                                limit, marker_obj,
-                                                page_reverse)
-
-    @staticmethod
-    def _get_collection(context, model, dict_func,
-                        filters=None, fields=None, sorts=None,
-                        limit=None, marker_obj=None,
-                        page_reverse=False):
-        return model_query.get_collection(context, model, dict_func,
-                                          filters, fields, sorts,
-                                          limit, marker_obj,
-                                          page_reverse)
-
-    @staticmethod
-    def _get_collection_count(context, model, filters=None):
-        return model_query.get_collection_count(context, model, filters)
-
-    # TODO(HenryG): Remove this when available in neutron-lib
-    def _get_marker_obj(self, context, resource, limit, marker):
-        return db_utils.get_marker_obj(self, context, resource, limit, marker)
diff --git a/neutron/db/db_base_plugin_common.py b/neutron/db/db_base_plugin_common.py
index 449b76af6a0..9e01df07d7f 100644
--- a/neutron/db/db_base_plugin_common.py
+++ b/neutron/db/db_base_plugin_common.py
@@ -34,7 +34,6 @@ from oslo_config import cfg
 from oslo_log import log as logging
 from sqlalchemy.orm import exc
 
-from neutron.db import common_db_mixin
 from neutron.db import models_v2
 from neutron.objects import base as base_obj
 from neutron.objects import ports as port_obj
@@ -78,7 +77,7 @@ def filter_fields(f):
     return inner_filter
 
 
-class DbBasePluginCommon(common_db_mixin.CommonDbMixin):
+class DbBasePluginCommon(object):
     """Stores getters and helper methods for db_base_plugin_v2
 
     All private getters and simple helpers like _make_*_dict were moved from
diff --git a/neutron/db/flavors_db.py b/neutron/db/flavors_db.py
index ba298762fa9..7e040e3cfb8 100644
--- a/neutron/db/flavors_db.py
+++ b/neutron/db/flavors_db.py
@@ -18,7 +18,6 @@ from neutron_lib.exceptions import flavors as flav_exc
 from oslo_db import exception as db_exc
 from oslo_log import log as logging
 
-from neutron.db import common_db_mixin
 from neutron.db import servicetype_db as sdb
 from neutron.objects import base as base_obj
 from neutron.objects import flavor as obj_flavor
@@ -27,7 +26,7 @@ from neutron.objects import flavor as obj_flavor
 LOG = logging.getLogger(__name__)
 
 
-class FlavorsDbMixin(common_db_mixin.CommonDbMixin):
+class FlavorsDbMixin(object):
 
     """Class to support flavors and service profiles."""
 
diff --git a/neutron/db/metering/metering_db.py b/neutron/db/metering/metering_db.py
index f717aae3ed2..23e9b7ebad3 100644
--- a/neutron/db/metering/metering_db.py
+++ b/neutron/db/metering/metering_db.py
@@ -21,7 +21,6 @@ from oslo_db import exception as db_exc
 from oslo_utils import uuidutils
 
 from neutron.api.rpc.agentnotifiers import metering_rpc_agent_api
-from neutron.db import common_db_mixin as base_db
 from neutron.db import l3_dvr_db
 from neutron.extensions import metering
 from neutron.objects import base as base_obj
@@ -29,8 +28,7 @@ from neutron.objects import metering as metering_objs
 from neutron.objects import router as l3_obj
 
 
-class MeteringDbMixin(metering.MeteringPluginBase,
-                      base_db.CommonDbMixin):
+class MeteringDbMixin(metering.MeteringPluginBase):
 
     def __init__(self):
         self.meter_rpc = metering_rpc_agent_api.MeteringAgentNotifyAPI()
diff --git a/neutron/db/rbac_db_mixin.py b/neutron/db/rbac_db_mixin.py
index 7e9521c2684..31952007d75 100644
--- a/neutron/db/rbac_db_mixin.py
+++ b/neutron/db/rbac_db_mixin.py
@@ -22,13 +22,12 @@ from neutron_lib.db import utils as db_utils
 from neutron_lib import exceptions as n_exc
 from oslo_db import exception as db_exc
 
-from neutron.db import common_db_mixin
 from neutron.extensions import rbac as ext_rbac
 from neutron.objects import base as base_obj
 from neutron.objects import rbac as rbac_obj
 
 
-class RbacPluginMixin(common_db_mixin.CommonDbMixin):
+class RbacPluginMixin(object):
     """Plugin mixin that implements the RBAC DB operations."""
 
     object_type_cache = {}
diff --git a/neutron/plugins/ml2/extensions/port_security.py b/neutron/plugins/ml2/extensions/port_security.py
index d43142ff8e0..f062fd565f4 100644
--- a/neutron/plugins/ml2/extensions/port_security.py
+++ b/neutron/plugins/ml2/extensions/port_security.py
@@ -19,15 +19,13 @@ from neutron_lib.plugins.ml2 import api
 from neutron_lib.utils import net
 from oslo_log import log as logging
 
-from neutron.db import common_db_mixin
 from neutron.db import portsecurity_db_common as ps_db_common
 
 LOG = logging.getLogger(__name__)
 
 
 class PortSecurityExtensionDriver(api.ExtensionDriver,
-                                  ps_db_common.PortSecurityDbCommon,
-                                  common_db_mixin.CommonDbMixin):
+                                  ps_db_common.PortSecurityDbCommon):
     _supported_extension_alias = 'port-security'
 
     def initialize(self):
diff --git a/neutron/services/auto_allocate/db.py b/neutron/services/auto_allocate/db.py
index 1c87a64f99d..da3d09d2364 100644
--- a/neutron/services/auto_allocate/db.py
+++ b/neutron/services/auto_allocate/db.py
@@ -31,7 +31,6 @@ from neutron_lib.plugins import utils as p_utils
 from oslo_log import log as logging
 
 from neutron._i18n import _
-from neutron.db import common_db_mixin
 from neutron.objects import auto_allocate as auto_allocate_obj
 from neutron.objects import base as base_obj
 from neutron.objects import network as net_obj
@@ -88,7 +87,7 @@ def _ensure_external_network_default_value_callback(
 
 
 @resource_extend.has_resource_extenders
-class AutoAllocatedTopologyMixin(common_db_mixin.CommonDbMixin):
+class AutoAllocatedTopologyMixin(object):
 
     def __new__(cls, *args, **kwargs):
         # NOTE(kevinbenton): we subscribe on object construction because
diff --git a/neutron/services/l3_router/l3_router_plugin.py b/neutron/services/l3_router/l3_router_plugin.py
index 051277ffa55..6ec9d388a0e 100644
--- a/neutron/services/l3_router/l3_router_plugin.py
+++ b/neutron/services/l3_router/l3_router_plugin.py
@@ -37,7 +37,6 @@ from oslo_utils import importutils
 
 from neutron.api.rpc.agentnotifiers import l3_rpc_agent_api
 from neutron.api.rpc.handlers import l3_rpc
-from neutron.db import common_db_mixin
 from neutron.db import dns_db
 from neutron.db import extraroute_db
 from neutron.db import l3_dvr_ha_scheduler_db
@@ -73,7 +72,6 @@ def disable_l3_qos_extension_by_plugins(ext, aliases):
 
 @resource_extend.has_resource_extenders
 class L3RouterPlugin(service_base.ServicePluginBase,
-                     common_db_mixin.CommonDbMixin,
                      extraroute_db.ExtraRoute_db_mixin,
                      l3_hamode_db.L3_HA_NAT_db_mixin,
                      l3_gateway_ip_qos.L3_gw_ip_qos_db_mixin,
diff --git a/neutron/services/segments/db.py b/neutron/services/segments/db.py
index f725eaa93df..88fe78dc0b0 100644
--- a/neutron/services/segments/db.py
+++ b/neutron/services/segments/db.py
@@ -29,7 +29,6 @@ from oslo_db import exception as db_exc
 from oslo_log import helpers as log_helpers
 from oslo_utils import uuidutils
 
-from neutron.db import common_db_mixin
 from neutron.db import segments_db as db
 from neutron.extensions import segment as extension
 from neutron import manager
@@ -58,7 +57,7 @@ def check_user_configured_segment_plugin():
     return _USER_CONFIGURED_SEGMENT_PLUGIN
 
 
-class SegmentDbMixin(common_db_mixin.CommonDbMixin):
+class SegmentDbMixin(object):
     """Mixin class to add segment."""
 
     @staticmethod
diff --git a/neutron/services/tag/tag_plugin.py b/neutron/services/tag/tag_plugin.py
index 2d0c2cd6cbd..b902109f352 100644
--- a/neutron/services/tag/tag_plugin.py
+++ b/neutron/services/tag/tag_plugin.py
@@ -20,7 +20,6 @@ from neutron_lib.plugins import directory
 from oslo_log import helpers as log_helpers
 from sqlalchemy.orm import exc
 
-from neutron.db import common_db_mixin
 from neutron.db import standard_attr
 from neutron.extensions import tagging
 from neutron.objects import tag as tag_obj
@@ -31,7 +30,7 @@ resource_model_map = standard_attr.get_standard_attr_resource_model_map()
 
 
 @resource_extend.has_resource_extenders
-class TagPlugin(common_db_mixin.CommonDbMixin, tagging.TagPluginBase):
+class TagPlugin(tagging.TagPluginBase):
     """Implementation of the Neutron Tag Service Plugin."""
 
     supported_extension_aliases = ['standard-attr-tag']
diff --git a/neutron/services/trunk/plugin.py b/neutron/services/trunk/plugin.py
index ecec0c6fea9..267871d75b2 100644
--- a/neutron/services/trunk/plugin.py
+++ b/neutron/services/trunk/plugin.py
@@ -29,7 +29,6 @@ from neutron_lib.services import base as service_base
 from oslo_log import log as logging
 from oslo_utils import uuidutils
 
-from neutron.db import common_db_mixin
 from neutron.db import db_base_plugin_common
 from neutron.objects import base as objects_base
 from neutron.objects import trunk as trunk_objects
@@ -45,8 +44,7 @@ LOG = logging.getLogger(__name__)
 
 @resource_extend.has_resource_extenders
 @registry.has_registry_receivers
-class TrunkPlugin(service_base.ServicePluginBase,
-                  common_db_mixin.CommonDbMixin):
+class TrunkPlugin(service_base.ServicePluginBase):
 
     supported_extension_aliases = [trunk_apidef.ALIAS,
                                    trunk_details.ALIAS]
diff --git a/neutron/tests/common/helpers.py b/neutron/tests/common/helpers.py
index 9254f085835..c48cc4f15a8 100644
--- a/neutron/tests/common/helpers.py
+++ b/neutron/tests/common/helpers.py
@@ -28,7 +28,6 @@ import testtools
 import neutron
 from neutron.agent.common import ovs_lib
 from neutron.db import agents_db
-from neutron.db import common_db_mixin
 
 HOST = 'localhost'
 DEFAULT_AZ = 'nova'
@@ -52,8 +51,7 @@ def get_test_log_path():
     return os.environ.get('OS_LOG_PATH', '/tmp')
 
 
-class FakePlugin(common_db_mixin.CommonDbMixin,
-                 agents_db.AgentDbMixin):
+class FakePlugin(agents_db.AgentDbMixin):
     pass
 
 
diff --git a/neutron/tests/functional/scheduler/test_dhcp_agent_scheduler.py b/neutron/tests/functional/scheduler/test_dhcp_agent_scheduler.py
index 27cecf2049f..e5198301dd1 100644
--- a/neutron/tests/functional/scheduler/test_dhcp_agent_scheduler.py
+++ b/neutron/tests/functional/scheduler/test_dhcp_agent_scheduler.py
@@ -24,7 +24,6 @@ import testscenarios
 
 from neutron.db import agents_db
 from neutron.db import agentschedulers_db
-from neutron.db import common_db_mixin
 from neutron.objects import network
 from neutron.scheduler import dhcp_agent_scheduler
 from neutron.tests.common import helpers
@@ -106,7 +105,6 @@ class BaseTestScheduleNetwork(object):
 class TestChanceScheduleNetwork(test_dhcp_sch.TestDhcpSchedulerBaseTestCase,
                                 agentschedulers_db.DhcpAgentSchedulerDbMixin,
                                 agents_db.AgentDbMixin,
-                                common_db_mixin.CommonDbMixin,
                                 BaseTestScheduleNetwork):
     """Test various scenarios for ChanceScheduler.schedule."""
 
@@ -144,7 +142,6 @@ class TestChanceScheduleNetwork(test_dhcp_sch.TestDhcpSchedulerBaseTestCase,
 class TestWeightScheduleNetwork(test_dhcp_sch.TestDhcpSchedulerBaseTestCase,
                                 agentschedulers_db.DhcpAgentSchedulerDbMixin,
                                 agents_db.AgentDbMixin,
-                                common_db_mixin.CommonDbMixin,
                                 BaseTestScheduleNetwork):
     """Test various scenarios for WeightScheduler.schedule."""
 
@@ -190,8 +187,7 @@ class TestWeightScheduleNetwork(test_dhcp_sch.TestDhcpSchedulerBaseTestCase,
 
 class TestAutoSchedule(test_dhcp_sch.TestDhcpSchedulerBaseTestCase,
                        agentschedulers_db.DhcpAgentSchedulerDbMixin,
-                       agents_db.AgentDbMixin,
-                       common_db_mixin.CommonDbMixin):
+                       agents_db.AgentDbMixin):
     """Test various scenarios for ChanceScheduler.auto_schedule_networks.
 
         Below is the brief description of the scenario variables
@@ -435,8 +431,7 @@ class TestAutoSchedule(test_dhcp_sch.TestDhcpSchedulerBaseTestCase,
 
 class TestAZAwareWeightScheduler(test_dhcp_sch.TestDhcpSchedulerBaseTestCase,
                                  agentschedulers_db.DhcpAgentSchedulerDbMixin,
-                                 agents_db.AgentDbMixin,
-                                 common_db_mixin.CommonDbMixin):
+                                 agents_db.AgentDbMixin):
     """Test various scenarios for AZAwareWeightScheduler.schedule.
 
         az_count
diff --git a/neutron/tests/unit/db/test_extraroute_db.py b/neutron/tests/unit/db/test_extraroute_db.py
index 9de46143440..828cc07f7bc 100644
--- a/neutron/tests/unit/db/test_extraroute_db.py
+++ b/neutron/tests/unit/db/test_extraroute_db.py
@@ -20,13 +20,11 @@ from neutron_lib import context
 from neutron_lib.plugins import constants
 from neutron_lib.plugins import directory
 
-from neutron.db import common_db_mixin
 from neutron.db import extraroute_db
 from neutron.tests.unit import testlib_api
 
 
-class _Plugin(common_db_mixin.CommonDbMixin,
-              extraroute_db.ExtraRoute_dbonly_mixin):
+class _Plugin(extraroute_db.ExtraRoute_dbonly_mixin):
     pass
 
 
diff --git a/neutron/tests/unit/db/test_l3_dvr_db.py b/neutron/tests/unit/db/test_l3_dvr_db.py
index 32c5f582df7..2e8485e21c8 100644
--- a/neutron/tests/unit/db/test_l3_dvr_db.py
+++ b/neutron/tests/unit/db/test_l3_dvr_db.py
@@ -28,7 +28,6 @@ from neutron_lib.plugins import utils as plugin_utils
 from oslo_utils import uuidutils
 
 from neutron.db import agents_db
-from neutron.db import common_db_mixin
 from neutron.db import l3_dvr_db
 from neutron.db import l3_dvrscheduler_db
 from neutron.db.models import l3 as l3_models
@@ -43,7 +42,6 @@ _uuid = uuidutils.generate_uuid
 
 
 class FakeL3Plugin(test_l3.TestL3PluginBaseAttributes,
-                   common_db_mixin.CommonDbMixin,
                    l3_dvr_db.L3_NAT_with_dvr_db_mixin,
                    l3_dvrscheduler_db.L3_DVRsch_db_mixin,
                    agents_db.AgentDbMixin):
diff --git a/neutron/tests/unit/db/test_l3_hamode_db.py b/neutron/tests/unit/db/test_l3_hamode_db.py
index 20bc18375d4..3635ebe2541 100644
--- a/neutron/tests/unit/db/test_l3_hamode_db.py
+++ b/neutron/tests/unit/db/test_l3_hamode_db.py
@@ -42,7 +42,6 @@ import testtools
 from neutron.agent.common import utils as agent_utils
 from neutron.api.rpc.handlers import l3_rpc
 from neutron.db import agents_db
-from neutron.db import common_db_mixin
 from neutron.db import l3_agentschedulers_db
 from neutron.db import l3_hamode_db
 from neutron.objects import l3_hamode
@@ -56,7 +55,6 @@ _uuid = uuidutils.generate_uuid
 
 
 class FakeL3PluginWithAgents(test_l3.TestL3PluginBaseAttributes,
-                             common_db_mixin.CommonDbMixin,
                              l3_hamode_db.L3_HA_NAT_db_mixin,
                              l3_agentschedulers_db.L3AgentSchedulerDbMixin,
                              agents_db.AgentDbMixin):
diff --git a/neutron/tests/unit/db/test_portsecurity_db_common.py b/neutron/tests/unit/db/test_portsecurity_db_common.py
index 1fd38f36cf7..2f50fd7e2f9 100644
--- a/neutron/tests/unit/db/test_portsecurity_db_common.py
+++ b/neutron/tests/unit/db/test_portsecurity_db_common.py
@@ -13,7 +13,6 @@
 import mock
 from neutron_lib.api.definitions import port_security as psec
 
-from neutron.db import common_db_mixin
 from neutron.db import portsecurity_db_common as pdc
 from neutron.objects import base as objects_base
 from neutron.objects import network
@@ -21,7 +20,7 @@ from neutron.objects.port.extensions import port_security as p_ps
 from neutron.tests import base
 
 
-class FakePlugin(pdc.PortSecurityDbCommon, common_db_mixin.CommonDbMixin):
+class FakePlugin(pdc.PortSecurityDbCommon):
     pass
 
 
diff --git a/neutron/tests/unit/db/test_securitygroups_db.py b/neutron/tests/unit/db/test_securitygroups_db.py
index bc3a4353e15..38bcf593e77 100644
--- a/neutron/tests/unit/db/test_securitygroups_db.py
+++ b/neutron/tests/unit/db/test_securitygroups_db.py
@@ -23,7 +23,6 @@ from neutron_lib import context
 import sqlalchemy
 import testtools
 
-from neutron.db import common_db_mixin
 from neutron.db import securitygroups_db
 from neutron.extensions import securitygroup
 from neutron.services.revisions import revision_plugin
@@ -61,8 +60,7 @@ def fake_callback(resource, event, *args, **kwargs):
     raise KeyError('bar')
 
 
-class SecurityGroupDbMixinImpl(securitygroups_db.SecurityGroupDbMixin,
-                               common_db_mixin.CommonDbMixin):
+class SecurityGroupDbMixinImpl(securitygroups_db.SecurityGroupDbMixin):
     pass
 
 
diff --git a/neutron/tests/unit/extensions/test_l3.py b/neutron/tests/unit/extensions/test_l3.py
index 95d3f51811f..925ce8f47c0 100644
--- a/neutron/tests/unit/extensions/test_l3.py
+++ b/neutron/tests/unit/extensions/test_l3.py
@@ -44,7 +44,6 @@ from webob import exc
 
 from neutron.api.rpc.agentnotifiers import l3_rpc_agent_api
 from neutron.api.rpc.handlers import l3_rpc
-from neutron.db import common_db_mixin
 from neutron.db import db_base_plugin_v2
 from neutron.db import dns_db
 from neutron.db import external_net_db
@@ -336,7 +335,6 @@ class TestNoL3NatPlugin(TestL3NatBasePlugin):
 # A L3 routing service plugin class for tests with plugins that
 # delegate away L3 routing functionality
 class TestL3NatServicePlugin(TestL3PluginBaseAttributes,
-                             common_db_mixin.CommonDbMixin,
                              l3_dvr_db.L3_NAT_with_dvr_db_mixin,
                              l3_db.L3_NAT_db_mixin, dns_db.DNSDbMixin):
 
diff --git a/neutron/tests/unit/extensions/test_router_availability_zone.py b/neutron/tests/unit/extensions/test_router_availability_zone.py
index 38b4d6e25ec..1e1b86de2b7 100644
--- a/neutron/tests/unit/extensions/test_router_availability_zone.py
+++ b/neutron/tests/unit/extensions/test_router_availability_zone.py
@@ -17,7 +17,6 @@ from neutron_lib import constants as lib_const
 from neutron_lib.plugins import constants
 
 from neutron.db.availability_zone import router as router_az_db
-from neutron.db import common_db_mixin
 from neutron.db import l3_agentschedulers_db
 from neutron.db import l3_db
 from neutron.extensions import l3
@@ -32,8 +31,7 @@ class AZL3ExtensionManager(test_az.AZExtensionManager):
                 l3.L3.get_resources())
 
 
-class AZRouterTestPlugin(common_db_mixin.CommonDbMixin,
-                         l3_db.L3_NAT_db_mixin,
+class AZRouterTestPlugin(l3_db.L3_NAT_db_mixin,
                          router_az_db.RouterAvailabilityZoneMixin,
                          l3_agentschedulers_db.AZL3AgentSchedulerDbMixin):
     supported_extension_aliases = [l3_apidef.ALIAS,
diff --git a/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py b/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py
index 11a651ff11d..e75a9bc277a 100644
--- a/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py
+++ b/neutron/tests/unit/plugins/ml2/drivers/l2pop/test_mech_driver.py
@@ -30,7 +30,6 @@ from oslo_serialization import jsonutils
 import testtools
 
 from neutron.db import agents_db
-from neutron.db import common_db_mixin
 from neutron.db import l3_agentschedulers_db
 from neutron.db import l3_hamode_db
 from neutron.plugins.ml2 import driver_context
@@ -59,8 +58,7 @@ DEVICE_OWNER_COMPUTE = constants.DEVICE_OWNER_COMPUTE_PREFIX + 'fake'
 DEVICE_OWNER_ROUTER_HA_INTF = constants.DEVICE_OWNER_ROUTER_HA_INTF + 'fake'
 
 
-class FakeL3PluginWithAgents(common_db_mixin.CommonDbMixin,
-                             l3_hamode_db.L3_HA_NAT_db_mixin,
+class FakeL3PluginWithAgents(l3_hamode_db.L3_HA_NAT_db_mixin,
                              l3_agentschedulers_db.L3AgentSchedulerDbMixin,
                              agents_db.AgentDbMixin):
     pass
diff --git a/neutron/tests/unit/scheduler/test_dhcp_agent_scheduler.py b/neutron/tests/unit/scheduler/test_dhcp_agent_scheduler.py
index 5e6bd86258f..68a32167dbf 100644
--- a/neutron/tests/unit/scheduler/test_dhcp_agent_scheduler.py
+++ b/neutron/tests/unit/scheduler/test_dhcp_agent_scheduler.py
@@ -26,7 +26,6 @@ from oslo_utils import uuidutils
 import testscenarios
 
 from neutron.db import agentschedulers_db as sched_db
-from neutron.db import common_db_mixin
 from neutron.objects import agent
 from neutron.objects import network as network_obj
 from neutron.scheduler import dhcp_agent_scheduler
@@ -405,8 +404,7 @@ class TestAutoScheduleSegments(test_plugin.Ml2PluginV2TestCase,
 
 
 class TestNetworksFailover(TestDhcpSchedulerBaseTestCase,
-                           sched_db.DhcpAgentSchedulerDbMixin,
-                           common_db_mixin.CommonDbMixin):
+                           sched_db.DhcpAgentSchedulerDbMixin):
     def test_reschedule_network_from_down_agent(self):
         net_id = uuidutils.generate_uuid()
         agents = self._create_and_set_agents_down(['host-a', 'host-b'], 1)