:original_name: dds_03_0110.html

.. _dds_03_0110:

Viewing Parameter Change History
================================

You can view the change history of a parameter template.

Precautions
-----------

In a newly exported or created parameter template, the change history is blank.

Viewing Change History of a Custom Parameter Template
-----------------------------------------------------

#. Log in to the management console.

#. Click |image1| in the upper left corner and select a region and a project.

#. Click **Service List**. Under **Database**, click **Document Database Service** to go to the DDS console.

#. On the **Parameter Template Management** page, click **Custom Templates**. Locate the target parameter template and click its name.

#. In the navigation pane on the left, choose **Change History**. Then, view the parameter name, original parameter value, new parameter value, modification status, and modification time.

   You can apply the parameter template to DB instances as required by referring to section :ref:`Applying a Parameter Template <dds_03_0014>`.

Viewing Change History of DB Instance Parameters
------------------------------------------------

#. Log in to the management console.
#. Click |image2| in the upper left corner and select a region and a project.
#. Click **Service List**. Under **Database**, click **Document Database Service** to go to the DDS console.
#. On the **Instance Management** page, click the target DB instance. The **Basic Information** page is displayed.
#. In the navigation pane on the left, click **Parameters**. On the **Change History** tab, view the parameter name, original parameter value, new parameter value, modification status, and modification time.

.. |image1| image:: /_static/images/en-us_image_0000001268771757.png
.. |image2| image:: /_static/images/en-us_image_0000001268771757.png
