diff --git a/lib/datalib.php b/lib/datalib.php
index 5d1cf8c8619..3cc6060f613 100644
--- a/lib/datalib.php
+++ b/lib/datalib.php
@@ -44,8 +44,16 @@ function execute_sql($command, $feedback=true) {
 
     global $db;
 
+    $olddebug = $db->debug;
+
+    if (!$feedback) {
+        $db->debug = false;
+    }
+
     $result = $db->Execute($command);
 
+    $db->debug = $olddebug;
+
     if ($result) {
         if ($feedback) {
             echo '<p><font color="green"><strong>'. get_string('success') .'</strong></font></p>';