Increase sort_buffer_size for mariadb@users

roles/mariadb-users/tasks/main.yml

@@ -7,9 +7,9 @@
     mariadb_settings:
       key_buffer_size: "{{ mariadb_users_key_buffer_size }}"
       thread_stack: "192K"
-      sort_buffer_size: "8M"
-      tmp_table_size: "256M"
-      max_heap_table_size: "256M"
+      sort_buffer_size: "512M"
+      tmp_table_size: "512M"
+      max_heap_table_size: "512M"
       join_buffer_size: "512K"
       query_cache_limit: 1048576
       query_cache_size: "128M"