Modifying Parameters of an RDS for MySQL Instance

Constraints

• For better parameter modification experience, you are advised to upgrade the minor version of your DB instance to the latest.
• RDS has default parameter templates whose parameter values cannot be changed. You can view these parameter values by clicking the default parameter templates. If an instance cannot be started due to incorrect parameter settings of its parameter template, you can reconfigure the parameters based on the default parameter template.
• Before modifying parameters, make sure you understand their meanings and fully verify the changes in a test environment to avoid instance or workload exceptions caused by inappropriate parameter settings.

Modifying a Custom Parameter Template and Applying It to a DB Instance

1. Log in to the management console.
2. Click in the upper left corner and select a region and a project.
3. Click in the upper left corner of the page and choose Database > Relational Database Service.
4. Choose Parameter Templates in the navigation pane on the left. On the Custom Templates page, click the target parameter template.
5. On the Parameters page, modify parameters as required.

   For parameter details, see Suggestions on RDS for MySQL Parameter Tuning.

   Available operations are as follows:

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

6. Click Change History to view the changes.
7. Apply the parameter template to your DB instance. For details, see Applying a Parameter Template.
8. View the status of the DB instance to which the parameter template has been applied.

   If the DB instance status is Parameter change. Pending reboot, a reboot is required for the modifications to take effect.

   • The DB instance reboot caused by instance class changes will not make parameter modifications take effect.
   • 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 are also applied 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 Parameters of a DB Instance

1. Log in to the management console.
2. Click in the upper left corner and select a region and a project.
3. Click in the upper left corner of the page and choose Database > Relational Database Service.
4. On the Instances page, click the DB instance name to go to the Basic Information page.
5. In the navigation pane on the left, choose Parameters. On the displayed page, modify parameters as required.
   • To save the modifications, click Save.
   • To cancel the modifications, click Cancel.
   • To preview the modifications, click Preview.

6. After the parameters are modified, choose whether to reboot the instance based on the information in the Effective upon Reboot column.
   • If Yes is displayed and the DB instance status on the Instances page is Parameter change. Pending reboot, a reboot is required for the modifications to take effect.
     • 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 are also applied 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.
   • If No is displayed, the modifications take effect immediately.

Modifying Parameters of Multiple DB Instances at a Time

1. Log in to the management console.
2. Click in the upper left corner and select a region and a project.
3. Click in the upper left corner of the page and choose Database > Relational Database Service.
4. On the Instances page, select the DB instances with the same DB engine of the same version and choose More > Modify Parameters above the DB instance list.
5. On the Modify Parameters page, select the parameters you want to modify, change the parameter values, and click Apply.

   A maximum of 30 parameters can be modified at a time. Only selected parameters will be applied to your DB instances. The modified parameters are automatically selected. You can also deselect them.

6. In the displayed dialog box, click OK.
7. After the parameters are modified, choose whether to reboot the instance based on the information in the Effective upon Reboot column.
   • If Yes is displayed and the DB instance status on the Instances page is Parameter change. Pending reboot, a reboot is required for the modifications to take effect.
     • 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 are also applied 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.
   • If No is displayed, the modifications take effect immediately.