Index: htdocs/backup/util/dbops/backup_question_dbops.class.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- htdocs/backup/util/dbops/backup_question_dbops.class.php	(revision a330f0f0c60e6480e18d27ebbf3b51427285eb13)
+++ htdocs/backup/util/dbops/backup_question_dbops.class.php	(revision )
@@ -40,6 +40,7 @@
     public static function calculate_question_categories($backupid, $contextid) {
         global $DB;
 
+        $trans = $DB->start_delegated_transaction();
         // First step, annotate all the categories for the given context (course/module)
         // i.e. the whole context questions bank
         $DB->execute("INSERT INTO {backup_ids_temp} (backupid, itemname, itemid)
@@ -68,6 +69,7 @@
                             FROM {question_categories}
                            WHERE contextid $contextssql", $params);
         }
+        $trans->allow_commit();
     }
 
     /**