diff --git a/zuul.d/integrated-gate.yaml b/zuul.d/integrated-gate.yaml
index 32c017a..63f1783 100644
--- a/zuul.d/integrated-gate.yaml
+++ b/zuul.d/integrated-gate.yaml
@@ -11,10 +11,11 @@
     vars:
       tox_envlist: all
       tempest_test_regex: tempest
-      # TODO(gmann): Enable File injection tests once nova bug is fixed
-      # https://bugs.launchpad.net/nova/+bug/1882421
-      # devstack_localrc:
-      #   ENABLE_FILE_INJECTION: true
+      devstack_localrc:
+        MYSQL_REDUCE_MEMORY: true
+        # TODO(gmann): Enable File injection tests once nova bug is fixed
+        # https://bugs.launchpad.net/nova/+bug/1882421
+        #   ENABLE_FILE_INJECTION: true
 
 - job:
     name: tempest-ipv6-only
@@ -314,6 +315,8 @@
     # This job run slow tests in parallel.
     vars:
       tox_envlist: slow
+      devstack_localrc:
+        MYSQL_REDUCE_MEMORY: true
 
 - job:
     name: tempest-cinder-v2-api
diff --git a/zuul.d/tempest-specific.yaml b/zuul.d/tempest-specific.yaml
index 972123e..a8c29af 100644
--- a/zuul.d/tempest-specific.yaml
+++ b/zuul.d/tempest-specific.yaml
@@ -49,6 +49,7 @@
       run_tempest_dry_cleanup: true
       devstack_localrc:
         DEVSTACK_PARALLEL: True
+        MYSQL_REDUCE_MEMORY: true
 
 - job:
     name: tempest-full-py3-ipv6