diff --git a/tools/configure_for_func_testing.sh b/tools/configure_for_func_testing.sh
index 5c6fc2b2cae..3014270cdaa 100755
--- a/tools/configure_for_func_testing.sh
+++ b/tools/configure_for_func_testing.sh
@@ -24,6 +24,7 @@ MYSQL_USER=${MYSQL_USER:-root}
 DATABASE_USER=${DATABASE_USER:-openstack_citest}
 DATABASE_NAME=${DATABASE_NAME:-openstack_citest}
 MEMORY_TRACKER=${MEMORY_TRACKER:-False}
+MYSQL_REDUCE_MEMORY=${MYSQL_REDUCE_MEMORY:-True}
 
 
 if [[ "$IS_GATE" != "True" ]] && [[ "$#" -lt 1 ]]; then
diff --git a/zuul.d/tempest-multinode.yaml b/zuul.d/tempest-multinode.yaml
index 394cf498620..cb81b2d2b41 100644
--- a/zuul.d/tempest-multinode.yaml
+++ b/zuul.d/tempest-multinode.yaml
@@ -77,6 +77,7 @@
     vars:
       tox_envlist: integrated-network
       devstack_localrc:
+        MYSQL_REDUCE_MEMORY: true
         CIRROS_VERSION: 0.6.1
         DEFAULT_IMAGE_NAME: cirros-0.6.1-x86_64-uec
         DEFAULT_IMAGE_FILE_NAME: cirros-0.6.1-x86_64-uec.tar.gz
@@ -203,6 +204,7 @@
     vars:
       tox_envlist: integrated-network
       devstack_localrc:
+        MYSQL_REDUCE_MEMORY: true
         CIRROS_VERSION: 0.6.1
         DEFAULT_IMAGE_NAME: cirros-0.6.1-x86_64-uec
         DEFAULT_IMAGE_FILE_NAME: cirros-0.6.1-x86_64-uec.tar.gz
@@ -291,6 +293,7 @@
       devstack_plugins:
         neutron: https://opendev.org/openstack/neutron.git
       devstack_localrc:
+        MYSQL_REDUCE_MEMORY: true
         CIRROS_VERSION: 0.6.1
         DEFAULT_IMAGE_NAME: cirros-0.6.1-x86_64-uec
         DEFAULT_IMAGE_FILE_NAME: cirros-0.6.1-x86_64-uec.tar.gz
@@ -417,6 +420,7 @@
             ovn:
               enable_distributed_floating_ip: True
       devstack_localrc:
+        MYSQL_REDUCE_MEMORY: true
         CIRROS_VERSION: 0.6.1
         DEFAULT_IMAGE_NAME: cirros-0.6.1-x86_64-uec
         DEFAULT_IMAGE_FILE_NAME: cirros-0.6.1-x86_64-uec.tar.gz
diff --git a/zuul.d/tempest-singlenode.yaml b/zuul.d/tempest-singlenode.yaml
index 718194bcc78..62aa540c931 100644
--- a/zuul.d/tempest-singlenode.yaml
+++ b/zuul.d/tempest-singlenode.yaml
@@ -12,6 +12,7 @@
       tempest_concurrency: 4
       devstack_localrc:
         Q_ML2_TENANT_NETWORK_TYPE: vxlan
+        MYSQL_REDUCE_MEMORY: true
       devstack_plugins:
         neutron: https://opendev.org/openstack/neutron.git
       devstack_services:
@@ -260,6 +261,7 @@
     vars:
       devstack_localrc:
         MYSQL_SERVICE_NAME: mariadb
+        MYSQL_REDUCE_MEMORY: true
       devstack_plugins:
         neutron: https://opendev.org/openstack/neutron.git
       devstack_services:
@@ -411,6 +413,7 @@
     vars:
       devstack_localrc:
         NEUTRON_DEPLOY_MOD_WSGI: true
+        MYSQL_REDUCE_MEMORY: true
       devstack_plugins:
         neutron: https://opendev.org/openstack/neutron.git
       devstack_services:
@@ -482,6 +485,7 @@
             DEFAULT:
               rpc_workers: 0
       devstack_localrc:
+        MYSQL_REDUCE_MEMORY: true
         CIRROS_VERSION: 0.6.1
         DEFAULT_IMAGE_NAME: cirros-0.6.1-x86_64-uec
         DEFAULT_IMAGE_FILE_NAME: cirros-0.6.1-x86_64-uec.tar.gz
@@ -708,6 +712,7 @@
     vars:
       tox_envlist: integrated-network
       devstack_localrc:
+        MYSQL_REDUCE_MEMORY: true
         CIRROS_VERSION: 0.6.1
         DEFAULT_IMAGE_NAME: cirros-0.6.1-x86_64-uec
         DEFAULT_IMAGE_FILE_NAME: cirros-0.6.1-x86_64-uec.tar.gz