diff --git a/ansible/group_vars/database-hosts.yml b/ansible/group_vars/database-hosts.yml
index 7fc9ad22..3867eb6c 100644
--- a/ansible/group_vars/database-hosts.yml
+++ b/ansible/group_vars/database-hosts.yml
@@ -38,3 +38,4 @@ postgresql_install_extensions: True
 
 postgresql_server_conf:
   shared_buffers: "{{ (ansible_memtotal_mb / 4) | int }}MB"
+  effective_cache_size: "{{ (ansible_memtotal_mb * 0.75 ) | int }}MB"