diff --git a/lib/classes/lock/mysql_lock_factory.php b/lib/classes/lock/mysql_lock_factory.php
deleted file mode 100644
index 1b0d18a1efc..00000000000
--- a/lib/classes/lock/mysql_lock_factory.php
+++ /dev/null
@@ -1,157 +0,0 @@
-<?php
-// This file is part of Moodle - http://moodle.org/
-//
-// Moodle is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// Moodle is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
-
-/**
- * MySQL GET_LOCK locking factory.
- *
- * @package    core
- * @category   lock
- * @copyright  Damyon Wiese 2013
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-
-namespace core\lock;
-
-defined('MOODLE_INTERNAL') || die();
-
-/**
- * MySQL GET_LOCK locking factory.
- *
- * Use MySQL GET_LOCK functions to support locking. Supports auto-release and timeouts and should be fairly quick.
- *
- * @package   core
- * @category  lock
- * @copyright Damyon Wiese 2013
- * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-class mysql_lock_factory implements lock_factory {
-
-    /** @var \moodle_database $db Hold a reference to the global $DB */
-    protected $db;
-
-    /** @var string $type Used to prefix lock keys */
-    protected $type;
-
-    /** @var array $openlocks - List of held locks - used by auto-release */
-    protected $openlocks = array();
-
-    /**
-     * Is available.
-     * @return boolean - True if this lock type is available in this environment.
-     */
-    public function is_available() {
-        return $this->db->get_dbfamily() === 'mysql';
-    }
-
-    /**
-     * Almighty constructor.
-     * @param string $type - Used to prefix lock keys.
-     */
-    public function __construct($type) {
-        global $DB;
-
-        $this->type = $type;
-        // Save a reference to the global $DB so it will not be released while we still have open locks.
-        $this->db = $DB;
-
-        \core_shutdown_manager::register_function(array($this, 'auto_release'));
-    }
-
-    /**
-     * Return information about the blocking behaviour of the lock type on this platform.
-     * @return boolean - Defer to the DB driver.
-     */
-    public function supports_timeout() {
-        return true;
-    }
-
-    /**
-     * Will this lock type will be automatically released when a process ends.
-     *
-     * @return boolean - Defer to the DB driver.
-     */
-    public function supports_auto_release() {
-        return true;
-    }
-
-    /**
-     * Multiple locks for the same resource can be held by a single process.
-     * @return boolean - Defer to the DB driver.
-     */
-    public function supports_recursion() {
-        return true;
-    }
-
-    /**
-     * Create and get a lock
-     * @param string $resource - The identifier for the lock. Should use frankenstyle prefix.
-     * @param int $timeout - The number of seconds to wait for a lock before giving up.
-     * @param int $maxlifetime - Unused by this lock type.
-     * @return boolean - true if a lock was obtained.
-     */
-    public function get_lock($resource, $timeout, $maxlifetime = 86400) {
-        $params = array(
-            'key' => $resource,
-            'timeout' => $timeout
-        );
-        $result = $this->db->get_record_sql('SELECT GET_LOCK(:key, :timeout) AS locked',
-                                            $params);
-        $locked = (bool)($result->locked);
-
-        if ($locked) {
-            $this->openlocks[$resource] = 1;
-            return new lock($resource, $this);
-        }
-        return false;
-    }
-
-    /**
-     * Release a lock that was previously obtained with @lock.
-     * @param lock $lock - a lock obtained from this factory.
-     * @return boolean - true if the lock is no longer held (including if it was never held).
-     */
-    public function release_lock(lock $lock) {
-        $result = $this->db->get_record_sql('SELECT RELEASE_LOCK(:key) AS unlocked', array('key' => $lock->get_key()));
-        $result = (bool)$result->unlocked;
-        if ($result) {
-            unset($this->openlocks[$lock->get_key()]);
-        }
-        return $result;
-    }
-
-    /**
-     * Extend a lock that was previously obtained with @lock.
-     * @param lock $lock - a lock obtained from this factory.
-     * @param int $maxlifetime - the new lifetime for the lock (in seconds).
-     * @return boolean - true if the lock was extended.
-     */
-    public function extend_lock(lock $lock, $maxlifetime = 86400) {
-        // Not supported by this factory.
-        return false;
-    }
-
-    /**
-     * Auto release any open locks on shutdown.
-     * This is required, because we may be using persistent DB connections.
-     */
-    public function auto_release() {
-        // Called from the shutdown handler. Must release all open locks.
-        foreach ($this->openlocks as $key => $unused) {
-            $lock = new lock($key, $this);
-            $this->release_lock($lock);
-        }
-    }
-}