Help Center> Relational Database Service> User Guide (Paris Region) > Working with RDS for MySQL> Parameter Template Management> Modifying Parameters
Updated on 2023-06-19 GMT+08:00
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Modifying Parameters

You can modify parameters in a custom parameter template to optimize RDS database performance.

You can change parameter values in custom parameter templates only and cannot change parameter values in default parameter templates.

If you modify a parameter, when the modification takes effect is determined by the type of parameter.

The RDS console displays the statuses of DB instances to which the parameter template applies. For example, if the DB instance has not used the latest modifications made to its parameter template, its status is Pending reboot. You need to manually reboot the DB instance for the latest modifications to take effect for that DB instance.

RDS has default parameter templates whose parameter values cannot be changed. You can view these parameter values by clicking the default parameter templates. If a custom parameter template is set incorrectly, the database startup may fail. You can re-configure the custom parameter template according to the configurations of the default parameter template.

Modifying Parameter Template Parameters

  1. Log in to the management console.
  2. Click in the upper left corner and select a region and a project.
  3. Click Service List. Under Database, click Relational Database Service. The RDS console is displayed.
  4. Choose Parameter Template Management in the navigation pane on the left. On the Custom Templates page, click the target parameter template.
  5. Modify parameters as required.

    For detailed parameter description, see section Suggestions on Tuning MySQL Parameters.

    Available operations are as follows:

    After you modify parameters in a parameter template, some modifications immediately take effect for the DB instance to which the parameter template applies. Exercise caution when performing this operation.

    • To save the modifications, click Save.
    • To cancel the modifications, click Cancel.
    • To preview the modifications, click Preview.

  6. After the parameters are modified, you can click Change History to view the modification details.

    The modifications take effect only after you apply the parameter template to DB instances. For details, see Applying a Parameter Template.

    • If you have modified parameters of a primary DB instance, you need to reboot the primary DB instance for the modifications to take effect. (For primary/standby DB instances, the parameter modifications also apply to the standby DB instance.)
    • If you have modified parameters of a read replica, you need to reboot the read replica for the modifications to take effect.

Modifying Instance Parameters

  1. Log in to the management console.
  2. Click in the upper left corner and select a region and a project.
  3. Click Service List. Under Database, click Relational Database Service. The RDS console is displayed.
  4. On the Instance Management page, click the target DB instance.
  5. In the navigation pane on the left, choose Parameters. On the displayed page, modify parameters as required.

    Available operations are as follows:

    After you modify instance parameters, the modifications immediately take effect for the DB instance.

    Check the value in the Effective upon Reboot column.
    • If the value is Yes and the DB instance status on the Instance Management page is Pending reboot, you must reboot the DB instance for the modifications to take effect.
    • If the value is No, the modifications take effect immediately.
    • To save the modifications, click Save.
    • To cancel the modifications, click Cancel.
    • To preview the modifications, click Preview.

    After parameters are modified, you can click Change History to view parameter modification details.