diff --git a/db_scripts/diff/13042_not_replicated.down b/db_scripts/diff/13042_not_replicated.down
new file mode 100644
index 00000000..419416db
--- /dev/null
+++ b/db_scripts/diff/13042_not_replicated.down
@@ -0,0 +1,2 @@
+SET sql_log_bin=0;
+ALTER TABLE accounting.cdr DROP KEY stime_idx;
diff --git a/db_scripts/diff/13042_not_replicated.up b/db_scripts/diff/13042_not_replicated.up
new file mode 100644
index 00000000..f9035355
--- /dev/null
+++ b/db_scripts/diff/13042_not_replicated.up
@@ -0,0 +1,8 @@
+-- We explicitely don't replicate this statement in order
+-- to perform the query only on the corresponding standby
+-- node, and we make sure to execute it on both nodes.
+-- The reason is that this statement might take quite long
+-- and would lock the cdr table on the active node.
+
+SET sql_log_bin=0;
+ALTER TABLE accounting.cdr ADD KEY stime_idx(start_time);