You can modify parameters in custom parameter templates as needed to get the most out of DDS performance.

You can modify parameters in either of the following ways:

Directly modify the parameters of a specified instance.
If you change a dynamic parameter value in a parameter template and save the change, the change takes effect immediately regardless of the Effective upon Reboot setting. If you modify static parameters on the Parameters page of an instance and save the modifications, the modifications take effect only after you manually restart the target instance.
Modify the parameters in a parameter template and apply the template to the instance.
The changes only take effect after you apply the template to the instance. If you modify static parameters in a custom parameter template on the Parameter Template Management page and save the modifications, the modifications take effect only after you apply the parameter template to instances and manually restart the instances. For operation details, see Applying a Parameter Template.

You can change parameter values in custom parameter templates but cannot change the default parameter templates provided by the system. You can only click the name of a default parameter template to view its details.
If a custom parameter template is set incorrectly, the instance associated with the template may fail to start. You can re-configure the custom parameter template according to the configurations of the default parameter template.

Log in to the management console.
Click 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.
In the navigation pane on the left, choose Instance Management. On the displayed page, click the DB instance whose parameters you wish to modify.
In the navigation pane on the left, choose Parameters. On the displayed page, modify parameters as required.
- To save the modifications, click Save.
- If you want to cancel the modifications, click Cancel.
- If you want to preview the modifications, click Preview.
After parameters are modified, click Change History to view parameter modification details.
For details about how to view parameter modification details, see Viewing Parameter Change History.
After you modify instance parameters, the modifications immediately take effect for the instance.
Check the value in the Effective upon Restart column.
If the value is Yes and the instance status on the Instance Management page is Pending restart, restart the DB instance for the modifications to take effect.
If the value is No, the modifications take effect immediately.

Log in to the management console.
Click 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.
In the navigation pane on the left, click Parameter Template Management.
On the Parameter Template Management page, click Custom Templates. Select the Clusters, Replica Sets, or Single Nodes sub-tab and click the parameter template you created.
Modify the required parameters.
- If you want to save the modifications, click Save.
- If you want to cancel the modifications, click Cancel.
- If you want to preview the modifications, click Preview.
After parameters are modified, click Change History to view parameter modification details.
For details about how to view parameter modification details, see Viewing Parameter Change History.
- The modifications take effect only after you apply the parameter template to instances. For details, see Applying a Parameter Template.
- The change history page displays only the modifications of the last seven days.
- For details about the parameter template statuses, see DB Instance Status.
- After modifying a parameter, view the associated instance status in the instance list. If Pending restart is displayed, restart the instance for the modification to take effect. For details, see Restarting a DB Instance or a Node.

Modifying a Parameter Template