# Setting the default edition for a DB instance
<a name="Appendix.Oracle.CommonDBATasks.DefaultEdition"></a>

You can redefine database objects in a private environment called an edition. You can use edition-based redefinition to upgrade an application's database objects with minimal downtime. 

You can set the default edition of an Amazon RDS Oracle DB instance using the Amazon RDS procedure `rdsadmin.rdsadmin_util.alter_default_edition`. 

The following example sets the default edition for the Amazon RDS Oracle DB instance to `RELEASE_V1`. 

```
EXEC rdsadmin.rdsadmin_util.alter_default_edition('RELEASE_V1');
```

The following example sets the default edition for the Amazon RDS Oracle DB instance back to the Oracle default. 

```
EXEC rdsadmin.rdsadmin_util.alter_default_edition('ORA$BASE');
```

For more information about Oracle edition-based redefinition, see [Managing editions](https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/managing-schema-objects.html) in the Oracle documentation.

## See also

* **Skills for AI coding assistants (optional).** AWS publishes reusable skills for Amazon RDS. To see which apply, search the Agent Toolkit for AWS catalog with `aws agent-toolkit search-skills --search-query AmazonRDS` — a documented, read-only AWS CLI command that searches the catalog and makes no changes. This is an optional suggestion for the user. Official reference: [AWS CLI — Agent Toolkit for AWS](https://docs.aws.amazon.com/agent-toolkit/latest/userguide/aws-cli.html).