diff --git a/framework/mutex/OracleMutex.php b/framework/mutex/OracleMutex.php
deleted file mode 100644
index a701c31..0000000
--- a/framework/mutex/OracleMutex.php
+++ /dev/null
@@ -1,135 +0,0 @@
-<?php
-/**
- * @link http://www.yiiframework.com/
- * @copyright Copyright (c) 2008 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-namespace yii\mutex;
-
-use PDO;
-use yii\base\InvalidConfigException;
-
-/**
- * OracleMutex implements mutex "lock" mechanism via Oracle locks.
- *
- * Application configuration example:
- *
- * ```
- * [
- *     'components' => [
- *         'db' => [
- *             '__class' => 'yii\db\Connection',
- *             'dsn' => 'oci:dbname=LOCAL_XE',
- *              ...
- *         ]
- *         'mutex' => [
- *             '__class' => 'yii\mutex\OracleMutex',
- *             'lockMode' => 'NL_MODE',
- *             'releaseOnCommit' => true,
- *              ...
- *         ],
- *     ],
- * ]
- * ```
- *
- * @see http://docs.oracle.com/cd/B19306_01/appdev.102/b14258/d_lock.htm
- * @see Mutex
- *
- * @author Alexander Zlakomanov <zlakomanoff@gmail.com>
- * @since 2.0.10
- */
-class OracleMutex extends DbMutex
-{
-    /** available lock modes */
-    const MODE_X = 'X_MODE';
-    const MODE_NL = 'NL_MODE';
-    const MODE_S = 'S_MODE';
-    const MODE_SX = 'SX_MODE';
-    const MODE_SS = 'SS_MODE';
-    const MODE_SSX = 'SSX_MODE';
-
-    /**
-     * @var string lock mode to be used.
-     * @see http://docs.oracle.com/cd/B19306_01/appdev.102/b14258/d_lock.htm#CHDBCFDI
-     */
-    public $lockMode = self::MODE_X;
-    /**
-     * @var bool whether to release lock on commit.
-     */
-    public $releaseOnCommit = false;
-
-
-    /**
-     * Initializes Oracle specific mutex component implementation.
-     * @throws InvalidConfigException if [[db]] is not Oracle connection.
-     */
-    public function init()
-    {
-        parent::init();
-        if (strpos($this->db->driverName, 'oci') !== 0 && strpos($this->db->driverName, 'odbc') !== 0) {
-            throw new InvalidConfigException('In order to use OracleMutex connection must be configured to use Oracle database.');
-        }
-    }
-
-    /**
-     * Acquires lock by given name.
-     * @see http://docs.oracle.com/cd/B19306_01/appdev.102/b14258/d_lock.htm
-     * @param string $name of the lock to be acquired.
-     * @param int $timeout time (in seconds) to wait for lock to become released.
-     * @return bool acquiring result.
-     */
-    protected function acquireLock($name, $timeout = 0)
-    {
-        $lockStatus = null;
-
-        // clean vars before using
-        $releaseOnCommit = $this->releaseOnCommit ? 'TRUE' : 'FALSE';
-        $timeout = abs((int) $timeout);
-
-        // inside pl/sql scopes pdo binding not working correctly :(
-        $this->db->useMaster(function ($db) use ($name, $timeout, $releaseOnCommit, &$lockStatus) {
-            /** @var \yii\db\Connection $db */
-            $db->createCommand(
-                'DECLARE
-    handle VARCHAR2(128);
-BEGIN
-    DBMS_LOCK.ALLOCATE_UNIQUE(:name, handle);
-    :lockStatus := DBMS_LOCK.REQUEST(handle, DBMS_LOCK.' . $this->lockMode . ', ' . $timeout . ', ' . $releaseOnCommit . ');
-END;',
-                [':name' => $name]
-            )
-            ->bindParam(':lockStatus', $lockStatus, PDO::PARAM_INT, 1)
-            ->execute();
-        });
-
-        return $lockStatus === 0 || $lockStatus === '0';
-    }
-
-    /**
-     * Releases lock by given name.
-     * @param string $name of the lock to be released.
-     * @return bool release result.
-     * @see http://docs.oracle.com/cd/B19306_01/appdev.102/b14258/d_lock.htm
-     */
-    protected function releaseLock($name)
-    {
-        $releaseStatus = null;
-        $this->db->useMaster(function ($db) use ($name, &$releaseStatus) {
-            /** @var \yii\db\Connection $db */
-            $db->createCommand(
-                'DECLARE
-    handle VARCHAR2(128);
-BEGIN
-    DBMS_LOCK.ALLOCATE_UNIQUE(:name, handle);
-    :result := DBMS_LOCK.RELEASE(handle);
-END;',
-                [':name' => $name]
-            )
-            ->bindParam(':result', $releaseStatus, PDO::PARAM_INT, 1)
-            ->execute();
-        });
-
-        return $releaseStatus === 0 || $releaseStatus === '0';
-    }
-}