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. When you change parameter values in a custom parameter template, the changes take effect for all DB instances to which the parameter template applies.
In conclusion, after you modify a parameter, the time when the modification takes effect is determined by the type of the 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 Parameter change. Pending reboot. You need to manually reboot the DB instance for the latest modifications to take effect for that DB instance.
Note
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¶
Log in to the management console.
Click
in the upper left corner and select a region and a project.Click
in the upper left corner of the page and choose Database > Relational Database Service. The RDS console is displayed.Choose Parameter Templates in the navigation pane on the left. On the Custom Templates page, click the target parameter template.
On the Parameters page, modify parameters as required.
For parameter description details, see Suggestions on Tuning MySQL Parameters.
Available operations are as follows:
To save the modifications, click Save.
To cancel the modifications, click Cancel.
To preview the modifications, click Preview.
After the parameter values 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.
View the status of the DB instance to which the parameter template is applied.
If the DB instance status is Parameter change. Pending reboot, you need to reboot the DB instance 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 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¶
Log in to the management console.
Click
in the upper left corner and select a region and a project.Click
in the upper left corner of the page and choose Database > Relational Database Service. The RDS console is displayed.On the Instances page, click the target DB instance.
In the navigation pane on the left, choose Parameters. On the displayed page, modify parameters as required.
Important
Check the value in the Effective upon Reboot column.
If the value is Yes and the DB instance status on the Instances page is Parameter change. Pending reboot, you must reboot the DB instance 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 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.
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.