**To modify a DB instance** The following ``modify-db-instance`` example associates an option group and a parameter group with a compatible Microsoft SQL Server DB instance. The ``--apply-immediately`` parameter causes the option and parameter groups to be associated immediately, instead of waiting until the next maintenance window. :: aws rds modify-db-instance \ --db-instance-identifier database-2 \ --option-group-name test-se-2017 \ --db-parameter-group-name test-sqlserver-se-2017 \ --apply-immediately Output:: { "DBInstance": { "DBInstanceIdentifier": "database-2", "DBInstanceClass": "db.r4.large", "Engine": "sqlserver-se", "DBInstanceStatus": "available", ...output omitted... "DBParameterGroups": [ { "DBParameterGroupName": "test-sqlserver-se-2017", "ParameterApplyStatus": "applying" } ], "AvailabilityZone": "us-west-2d", ...output omitted... "MultiAZ": true, "EngineVersion": "14.00.3281.6.v1", "AutoMinorVersionUpgrade": false, "ReadReplicaDBInstanceIdentifiers": [], "LicenseModel": "license-included", "OptionGroupMemberships": [ { "OptionGroupName": "test-se-2017", "Status": "pending-apply" } ], "CharacterSetName": "SQL_Latin1_General_CP1_CI_AS", "SecondaryAvailabilityZone": "us-west-2c", "PubliclyAccessible": true, "StorageType": "gp2", ...output omitted... "DeletionProtection": false, "AssociatedRoles": [], "MaxAllocatedStorage": 1000 } } For more information, see `Modifying an Amazon RDS DB Instance <https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overview.DBInstance.Modifying.html>`__ in the *Amazon RDS User Guide*.