diff --git a/ansible/host_vars/datanommer.yml b/ansible/host_vars/datanommer.yml
index 12f9ad2..f55e8b6 100644
--- a/ansible/host_vars/datanommer.yml
+++ b/ansible/host_vars/datanommer.yml
@@ -9,3 +9,13 @@ aws_region: us-east-1
 open_ports: [22, 80, 443]
 instance_type: r4.xlarge
 initiative_name: datanommer
+
+
+# postgresql related vars
+
+# kernel SHMMAX value
+kernel_shmmax: 68719476736
+
+shared_buffers: "4GB"
+effective_cache_size: "12GB"
+