Creates a new DB instance.
/// Specified CIDRIP or EC2 security group is not authorized for the specified DB security
/// group.
///
///
///
/// RDS may not also be authorized via IAM to perform necessary actions on your behalf.
///
///
///
DBClusterIdentifier does not refer to an existing DB cluster.
///
/// User already has a DB instance with the given identifier.
///
///
DBParameterGroupName does not refer to an existing DB parameter group.
///
///
DBSecurityGroupName does not refer to an existing DB security group.
///
/// Subnets in the DB subnet group should cover at least two Availability Zones unless
/// there is only one Availability Zone.
///
///
DBSubnetGroupName does not refer to an existing DB subnet group.
///
///
Domain does not refer to an existing Active Directory Domain.
///
/// Request would result in user exceeding the allowed number of DB instances.
///
/// Specified DB instance class is not available in the specified Availability Zone.
///
/// The DB cluster is not in a valid state.
///
/// The requested subnet is invalid, or multiple subnets were requested that are not all
/// in a common VPC.
///
/// DB subnet group does not cover all Availability Zones after it is created because
/// users' change.
///
/// Error accessing KMS key.
///
/// The specified option group could not be found.
///
/// Provisioned IOPS not available in the specified Availability Zone.
///
/// Request would result in user exceeding the allowed amount of storage available across
/// all DB instances.
///
///
StorageType specified cannot be associated with the DB Instance.
///