Ticket #11649: 11649-memory-is-the-cause-not-sql.patch

wp-admin/includes/upgrade.php

@@ -1692 +1692 @@
                 if ( !empty($delete_options) ) {
                         $delete_options = implode(',', $delete_options);
                         $wpdb->query("DELETE FROM $wpdb->options WHERE option_id IN ($delete_options)");
+                        unset( $delete_options );
                 }
 
                 // Drop the old primary key and add the new.