Creating a Custom Parameter Template

You can create custom parameter templates and apply them to one or more DB instances.

There are default parameter templates and custom parameter templates.

You can use database parameter templates to manage DB engine configurations. A database parameter template acts as a container for engine configuration values that can be applied to one or more instances.

If you create a DB instance without specifying a custom parameter template, the system uses a default one for the instance. Each default parameter template contains DB engine defaults and system defaults that are configured based on the engine, compute class, and storage space allocated of an instance. Parameter values in the default template cannot be changed, but you can create a custom template with whatever values you require. If you want to use a custom parameter template, you simply create a parameter template and select it when you create a DB instance or apply it to an existing DB instance by following the instructions provided in Applying a Parameter Template.

When you have already created a parameter template and want to include most of the custom parameters and values from that template in a new parameter template, you can replicate that parameter template by following the instructions provided in Replicating a Parameter Template.

Keep in mind the following points before modifying the parameters:

• When you change a parameter value on the Parameters page of an instance, the change is only applied to the current instance and does not affect other instances.
• The changes to parameter values in a custom parameter template are not applied to your instance until you apply the template to the instance. For details, see Applying a Parameter Template.
• Improper parameter settings may have unintended consequences, including reduced performance and system instability. Exercise caution when modifying database parameters and you need to back up data before modifying parameters in a parameter template. Before applying parameter template changes to a production DB instance, you should try out these changes on a test DB instance.