# Setting the default edition for a DB instance
Setting the default edition

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 [About editions and edition-based redefinition](https://docs.oracle.com/database/121/ADMIN/general.htm#ADMIN13167) in the Oracle documentation.