diff --git includes/database/mysql/query.inc includes/database/mysql/query.inc
index da4f9e6..daee647 100644
--- includes/database/mysql/query.inc
+++ includes/database/mysql/query.inc
@@ -44,18 +44,16 @@ class InsertQuery_mysql extends InsertQuery {
 
   public function __toString() {
 
-    $delay = $this->queryOptions['delay'] ? 'DELAYED' : '';
-
     // Default fields are always placed first for consistency.
     $insert_fields = array_merge($this->defaultFields, $this->insertFields);
 
     // If we're selecting from a SelectQuery, finish building the query and
     // pass it back, as any remaining options are irrelevant.
     if (!empty($this->fromQuery)) {
-      return "INSERT $delay INTO {" . $this->table . '} (' . implode(', ', $insert_fields) . ') ' . $this->fromQuery;
+      return "INSERT INTO {" . $this->table . '} (' . implode(', ', $insert_fields) . ') ' . $this->fromQuery;
     }
 
-    $query = "INSERT $delay INTO {" . $this->table . '} (' . implode(', ', $insert_fields) . ') VALUES ';
+    $query = "INSERT INTO {" . $this->table . '} (' . implode(', ', $insert_fields) . ') VALUES ';
 
     $max_placeholder = 0;
     $values = array();
diff --git includes/database/query.inc includes/database/query.inc
index 75412c9..6a4b387 100644
--- includes/database/query.inc
+++ includes/database/query.inc
@@ -414,33 +414,6 @@ class InsertQuery extends Query {
     return $this;
   }
 
-  /**
-   * Flag this query as being delay-safe or not.
-   *
-   * If this method is never called, it is assumed that the query must be
-   * executed immediately. If delay is set to TRUE, then the query will be
-   * flagged to run "delayed" or "low priority" on databases that support such
-   * capabilities. In that case, the database will return immediately and the
-   * query will be run at some point in the future. That makes it useful for
-   * logging-style queries.
-   *
-   * If the database does not support delayed INSERT queries, this method
-   * has no effect.
-   *
-   * Note that for a delayed query there is no serial ID returned, as it won't
-   * be created until later when the query runs. It should therefore not be
-   * used if the value of the ID is known.
-   *
-   * @param $delay
-   *   If TRUE, this query is delay-safe and will run delayed on supported databases.
-   * @return InsertQuery
-   *   The called object.
-   */
-  public function delay($delay = TRUE) {
-    $this->delay = $delay;
-    return $this;
-  }
-
   public function from(SelectQueryInterface $query) {
     $this->fromQuery = $query;
     return $this;