def create_db_instance(DBName=None, DBInstanceIdentifier=None,
    AllocatedStorage=None, DBInstanceClass=None, Engine=None,
    MasterUsername=None, MasterUserPassword=None, DBSecurityGroups=None,
    VpcSecurityGroupIds=None, AvailabilityZone=None, DBSubnetGroupName=None,
    PreferredMaintenanceWindow=None, DBParameterGroupName=None,
    BackupRetentionPeriod=None, PreferredBackupWindow=None, Port=None,
    MultiAZ=None, EngineVersion=None, AutoMinorVersionUpgrade=None,
    LicenseModel=None, Iops=None, OptionGroupName=None, CharacterSetName=
    None, PubliclyAccessible=None, Tags=None, DBClusterIdentifier=None,
    StorageType=None, TdeCredentialArn=None, TdeCredentialPassword=None,
    StorageEncrypted=None, KmsKeyId=None, Domain=None, CopyTagsToSnapshot=
    None, MonitoringInterval=None, MonitoringRoleArn=None,
    DomainIAMRoleName=None, PromotionTier=None, Timezone=None,
    EnableIAMDatabaseAuthentication=None):
    """
    Creates a new DB instance.
    See also: AWS API Documentation
    
    Examples
    This example creates a DB instance.
    Expected Output:
    
    :example: response = client.create_db_instance(
        DBName='string',
        DBInstanceIdentifier='string',
        AllocatedStorage=123,
        DBInstanceClass='string',
        Engine='string',
        MasterUsername='string',
        MasterUserPassword='string',
        DBSecurityGroups=[
            'string',
        ],
        VpcSecurityGroupIds=[
            'string',
        ],
        AvailabilityZone='string',
        DBSubnetGroupName='string',
        PreferredMaintenanceWindow='string',
        DBParameterGroupName='string',
        BackupRetentionPeriod=123,
        PreferredBackupWindow='string',
        Port=123,
        MultiAZ=True|False,
        EngineVersion='string',
        AutoMinorVersionUpgrade=True|False,
        LicenseModel='string',
        Iops=123,
        OptionGroupName='string',
        CharacterSetName='string',
        PubliclyAccessible=True|False,
        Tags=[
            {
                'Key': 'string',
                'Value': 'string'
            },
        ],
        DBClusterIdentifier='string',
        StorageType='string',
        TdeCredentialArn='string',
        TdeCredentialPassword='string',
        StorageEncrypted=True|False,
        KmsKeyId='string',
        Domain='string',
        CopyTagsToSnapshot=True|False,
        MonitoringInterval=123,
        MonitoringRoleArn='string',
        DomainIAMRoleName='string',
        PromotionTier=123,
        Timezone='string',
        EnableIAMDatabaseAuthentication=True|False
    )
    
    
    :type DBName: string
    :param DBName: The meaning of this parameter differs according to the database engine you use.
            Type: String
            MySQL
            The name of the database to create when the DB instance is created. If this parameter is not specified, no database is created in the DB instance.
            Constraints:
            Must contain 1 to 64 alphanumeric characters
            Cannot be a word reserved by the specified database engine
            MariaDB
            The name of the database to create when the DB instance is created. If this parameter is not specified, no database is created in the DB instance.
            Constraints:
            Must contain 1 to 64 alphanumeric characters
            Cannot be a word reserved by the specified database engine
            PostgreSQL
            The name of the database to create when the DB instance is created. If this parameter is not specified, the default 'postgres' database is created in the DB instance.
            Constraints:
            Must contain 1 to 63 alphanumeric characters
            Must begin with a letter or an underscore. Subsequent characters can be letters, underscores, or digits (0-9).
            Cannot be a word reserved by the specified database engine
            Oracle
            The Oracle System ID (SID) of the created DB instance. If you specify null , the default value ORCL is used. You can't specify the string NULL, or any other reserved word, for DBName .
            Default: ORCL
            Constraints:
            Cannot be longer than 8 characters
            SQL Server
            Not applicable. Must be null.
            Amazon Aurora
            The name of the database to create when the primary instance of the DB cluster is created. If this parameter is not specified, no database is created in the DB instance.
            Constraints:
            Must contain 1 to 64 alphanumeric characters
            Cannot be a word reserved by the specified database engine
            

    :type DBInstanceIdentifier: string
    :param DBInstanceIdentifier: [REQUIRED]
            The DB instance identifier. This parameter is stored as a lowercase string.
            Constraints:
            Must contain from 1 to 63 alphanumeric characters or hyphens (1 to 15 for SQL Server).
            First character must be a letter.
            Cannot end with a hyphen or contain two consecutive hyphens.
            Example: mydbinstance
            

    :type AllocatedStorage: integer
    :param AllocatedStorage: The amount of storage (in gigabytes) to be initially allocated for the database instance.
            Type: Integer
            Amazon Aurora
            Not applicable. Aurora cluster volumes automatically grow as the amount of data in your database increases, though you are only charged for the space that you use in an Aurora cluster volume.
            MySQL
            Constraints: Must be an integer from 5 to 6144.
            MariaDB
            Constraints: Must be an integer from 5 to 6144.
            PostgreSQL
            Constraints: Must be an integer from 5 to 6144.
            Oracle
            Constraints: Must be an integer from 10 to 6144.
            SQL Server
            Constraints: Must be an integer from 200 to 4096 (Standard Edition and Enterprise Edition) or from 20 to 4096 (Express Edition and Web Edition)
            

    :type DBInstanceClass: string
    :param DBInstanceClass: [REQUIRED]
            The compute and memory capacity of the DB instance. Note that not all instance classes are available in all regions for all DB engines.
            Valid Values: db.t1.micro | db.m1.small | db.m1.medium | db.m1.large | db.m1.xlarge | db.m2.xlarge |db.m2.2xlarge | db.m2.4xlarge | db.m3.medium | db.m3.large | db.m3.xlarge | db.m3.2xlarge | db.m4.large | db.m4.xlarge | db.m4.2xlarge | db.m4.4xlarge | db.m4.10xlarge | db.r3.large | db.r3.xlarge | db.r3.2xlarge | db.r3.4xlarge | db.r3.8xlarge | db.t2.micro | db.t2.small | db.t2.medium | db.t2.large
            

    :type Engine: string
    :param Engine: [REQUIRED]
            The name of the database engine to be used for this instance.
            Valid Values: mysql | mariadb | oracle-se1 | oracle-se2 | oracle-se | oracle-ee | sqlserver-ee | sqlserver-se | sqlserver-ex | sqlserver-web | postgres | aurora
            Not every database engine is available for every AWS region.
            

    :type MasterUsername: string
    :param MasterUsername: The name for the master database user.
            Amazon Aurora
            Not applicable. You specify the name for the master database user when you create your DB cluster.
            MariaDB
            Constraints:
            Must be 1 to 16 alphanumeric characters.
            Cannot be a reserved word for the chosen database engine.
            Microsoft SQL Server
            Constraints:
            Must be 1 to 128 alphanumeric characters.
            First character must be a letter.
            Cannot be a reserved word for the chosen database engine.
            MySQL
            Constraints:
            Must be 1 to 16 alphanumeric characters.
            First character must be a letter.
            Cannot be a reserved word for the chosen database engine.
            Oracle
            Constraints:
            Must be 1 to 30 alphanumeric characters.
            First character must be a letter.
            Cannot be a reserved word for the chosen database engine.
            PostgreSQL
            Constraints:
            Must be 1 to 63 alphanumeric characters.
            First character must be a letter.
            Cannot be a reserved word for the chosen database engine.
            

    :type MasterUserPassword: string
    :param MasterUserPassword: The password for the master database user. Can be any printable ASCII character except '/', ''', or '@'.
            Amazon Aurora
            Not applicable. You specify the password for the master database user when you create your DB cluster.
            MariaDB
            Constraints: Must contain from 8 to 41 characters.
            Microsoft SQL Server
            Constraints: Must contain from 8 to 128 characters.
            MySQL
            Constraints: Must contain from 8 to 41 characters.
            Oracle
            Constraints: Must contain from 8 to 30 characters.
            PostgreSQL
            Constraints: Must contain from 8 to 128 characters.
            

    :type DBSecurityGroups: list
    :param DBSecurityGroups: A list of DB security groups to associate with this DB instance.
            Default: The default DB security group for the database engine.
            (string) --
            

    :type VpcSecurityGroupIds: list
    :param VpcSecurityGroupIds: A list of EC2 VPC security groups to associate with this DB instance.
            Default: The default EC2 VPC security group for the DB subnet group's VPC.
            (string) --
            

    :type AvailabilityZone: string
    :param AvailabilityZone: The EC2 Availability Zone that the database instance will be created in. For information on regions and Availability Zones, see Regions and Availability Zones .
            Default: A random, system-chosen Availability Zone in the endpoint's region.
            Example: us-east-1d
            Constraint: The AvailabilityZone parameter cannot be specified if the MultiAZ parameter is set to true . The specified Availability Zone must be in the same region as the current endpoint.
            

    :type DBSubnetGroupName: string
    :param DBSubnetGroupName: A DB subnet group to associate with this DB instance.
            If there is no DB subnet group, then it is a non-VPC DB instance.
            

    :type PreferredMaintenanceWindow: string
    :param PreferredMaintenanceWindow: The weekly time range during which system maintenance can occur, in Universal Coordinated Time (UTC). For more information, see DB Instance Maintenance .
            Format: ddd:hh24:mi-ddd:hh24:mi
            Default: A 30-minute window selected at random from an 8-hour block of time per region, occurring on a random day of the week. To see the time blocks available, see Adjusting the Preferred Maintenance Window in the Amazon RDS User Guide.
            Valid Days: Mon, Tue, Wed, Thu, Fri, Sat, Sun
            Constraints: Minimum 30-minute window.
            

    :type DBParameterGroupName: string
    :param DBParameterGroupName: The name of the DB parameter group to associate with this DB instance. If this argument is omitted, the default DBParameterGroup for the specified engine will be used.
            Constraints:
            Must be 1 to 255 alphanumeric characters
            First character must be a letter
            Cannot end with a hyphen or contain two consecutive hyphens
            

    :type BackupRetentionPeriod: integer
    :param BackupRetentionPeriod: The number of days for which automated backups are retained. Setting this parameter to a positive number enables backups. Setting this parameter to 0 disables automated backups.
            Default: 1
            Constraints:
            Must be a value from 0 to 35
            Cannot be set to 0 if the DB instance is a source to Read Replicas
            

    :type PreferredBackupWindow: string
    :param PreferredBackupWindow: The daily time range during which automated backups are created if automated backups are enabled, using the BackupRetentionPeriod parameter. For more information, see DB Instance Backups .
            Default: A 30-minute window selected at random from an 8-hour block of time per region. To see the time blocks available, see Adjusting the Preferred DB Instance Maintenance Window .
            Constraints:
            Must be in the format hh24:mi-hh24:mi .
            Times should be in Universal Coordinated Time (UTC).
            Must not conflict with the preferred maintenance window.
            Must be at least 30 minutes.
            

    :type Port: integer
    :param Port: The port number on which the database accepts connections.
            MySQL
            Default: 3306
            Valid Values: 1150-65535
            Type: Integer
            MariaDB
            Default: 3306
            Valid Values: 1150-65535
            Type: Integer
            PostgreSQL
            Default: 5432
            Valid Values: 1150-65535
            Type: Integer
            Oracle
            Default: 1521
            Valid Values: 1150-65535
            SQL Server
            Default: 1433
            Valid Values: 1150-65535 except for 1434 , 3389 , 47001 , 49152 , and 49152 through 49156 .
            Amazon Aurora
            Default: 3306
            Valid Values: 1150-65535
            Type: Integer
            

    :type MultiAZ: boolean
    :param MultiAZ: Specifies if the DB instance is a Multi-AZ deployment. You cannot set the AvailabilityZone parameter if the MultiAZ parameter is set to true.

    :type EngineVersion: string
    :param EngineVersion: The version number of the database engine to use.
            The following are the database engines and major and minor versions that are available with Amazon RDS. Not every database engine is available for every AWS region.
            Amazon Aurora
            Version 5.6 (available in these AWS regions: ap-northeast-1, ap-northeast-2, ap-south-1, ap-southeast-2, eu-west-1, us-east-1, us-east-2, us-west-2): 5.6.10a
            MariaDB
            Version 10.1 (available in these AWS regions: us-east-2): 10.1.16
            Version 10.1 (available in these AWS regions: ap-northeast-1, ap-northeast-2, ap-south-1, ap-southeast-1, ap-southeast-2, eu-central-1, eu-west-1, sa-east-1, us-east-1, us-west-1, us-west-2): 10.1.14
            Version 10.0 (available in all AWS regions): 10.0.24
            Version 10.0 (available in these AWS regions: ap-northeast-1, ap-northeast-2, ap-south-1, ap-southeast-1, ap-southeast-2, eu-central-1, eu-west-1, sa-east-1, us-east-1, us-gov-west-1, us-west-1, us-west-2): 10.0.17
            Microsoft SQL Server 2016
            13.00.2164.0.v1 (supported for all editions, and all AWS regions except sa-east-1)
            Microsoft SQL Server 2014
            12.00.5000.0.v1 (supported for all editions, and all AWS regions)
            12.00.4422.0.v1 (supported for all editions except Enterprise Edition, and all AWS regions except us-east-2)
            Microsoft SQL Server 2012
            11.00.6020.0.v1 (supported for all editions, and all AWS regions)
            11.00.5058.0.v1 (supported for all editions, and all AWS regions except us-east-2)
            11.00.2100.60.v1 (supported for all editions, and all AWS regions except us-east-2)
            Microsoft SQL Server 2008 R2
            10.50.6529.0.v1 (supported for all editions, and all AWS regions except us-east-2)
            10.50.6000.34.v1 (supported for all editions, and all AWS regions except us-east-2)
            10.50.2789.0.v1 (supported for all editions, and all AWS regions except us-east-2)
            MySQL
            Version 5.7 (available in all AWS regions): 5.7.11
            Version 5.7 (available in these AWS regions: ap-northeast-1, ap-northeast-2, ap-south-1, ap-southeast-1, ap-southeast-2, eu-central-1, eu-west-1, sa-east-1, us-east-1, us-gov-west-1, us-west-1, us-west-2): 5.7.10
            Version 5.6 (available in all AWS regions): 5.6.29
            Version 5.6 (available in these AWS regions: ap-northeast-1, ap-northeast-2, ap-south-1, ap-southeast-1, ap-southeast-2, eu-central-1, eu-west-1, sa-east-1, us-east-1, us-gov-west-1, us-west-1, us-west-2): 5.6.27
            Version 5.6 (available in these AWS regions: ap-northeast-1, ap-northeast-2, ap-southeast-1, ap-southeast-2, eu-central-1, eu-west-1, sa-east-1, us-east-1, us-gov-west-1, us-west-1, us-west-2): 5.6.23
            Version 5.6 (available in these AWS regions: ap-northeast-1, ap-southeast-1, ap-southeast-2, eu-central-1, eu-west-1, sa-east-1, us-east-1, us-gov-west-1, us-west-1, us-west-2): 5.6.19a | 5.6.19b | 5.6.21 | 5.6.21b | 5.6.22
            Version 5.5 (available in all AWS regions): 5.5.46
            Version 5.1 (only available in AWS regions ap-northeast-1, ap-southeast-1, ap-southeast-2, eu-west-1, sa-east-1, us-east-1, us-gov-west-1, us-west-1, us-west-2): 5.1.73a | 5.1.73b
            Oracle 12c
            12.1.0.2.v8 (supported for EE in all AWS regions, and SE2 in all AWS regions except us-gov-west-1)
            12.1.0.2.v7 (supported for EE in all AWS regions, and SE2 in all AWS regions except us-gov-west-1)
            12.1.0.2.v6 (supported for EE in all AWS regions, and SE2 in all AWS regions except us-gov-west-1)
            12.1.0.2.v5 (supported for EE in all AWS regions, and SE2 in all AWS regions except us-gov-west-1)
            12.1.0.2.v4 (supported for EE in all AWS regions, and SE2 in all AWS regions except us-gov-west-1)
            12.1.0.2.v3 (supported for EE in all AWS regions, and SE2 in all AWS regions except us-gov-west-1)
            12.1.0.2.v2 (supported for EE in all AWS regions, and SE2 in all AWS regions except us-gov-west-1)
            12.1.0.2.v1 (supported for EE in all AWS regions, and SE2 in all AWS regions except us-gov-west-1)
            Oracle 11g
            11.2.0.4.v12 (supported for EE, SE1, and SE, in all AWS regions)
            11.2.0.4.v11 (supported for EE, SE1, and SE, in all AWS regions)
            11.2.0.4.v10 (supported for EE, SE1, and SE, in all AWS regions)
            11.2.0.4.v9 (supported for EE, SE1, and SE, in all AWS regions)
            11.2.0.4.v8 (supported for EE, SE1, and SE, in all AWS regions)
            11.2.0.4.v7 (supported for EE, SE1, and SE, in all AWS regions)
            11.2.0.4.v6 (supported for EE, SE1, and SE, in all AWS regions)
            11.2.0.4.v5 (supported for EE, SE1, and SE, in all AWS regions)
            11.2.0.4.v4 (supported for EE, SE1, and SE, in all AWS regions)
            11.2.0.4.v3 (supported for EE, SE1, and SE, in all AWS regions)
            11.2.0.4.v1 (supported for EE, SE1, and SE, in all AWS regions)
            PostgreSQL
            Version 9.6.x: 9.6.1 | 9.6.2
            Version 9.5.x: 9.5.6 | 9.5.4 | 9.5.2
            Version 9.4.x: 9.4.11 | 9.4.9 | 9.4.7
            Version 9.3.x: 9.3.16 | 9.3.14 | 9.3.12
            

    :type AutoMinorVersionUpgrade: boolean
    :param AutoMinorVersionUpgrade: Indicates that minor engine upgrades will be applied automatically to the DB instance during the maintenance window.
            Default: true
            

    :type LicenseModel: string
    :param LicenseModel: License model information for this DB instance.
            Valid values: license-included | bring-your-own-license | general-public-license
            

    :type Iops: integer
    :param Iops: The amount of Provisioned IOPS (input/output operations per second) to be initially allocated for the DB instance.
            Constraints: Must be a multiple between 3 and 10 of the storage amount for the DB instance. Must also be an integer multiple of 1000. For example, if the size of your DB instance is 500 GB, then your Iops value can be 2000, 3000, 4000, or 5000.
            

    :type OptionGroupName: string
    :param OptionGroupName: Indicates that the DB instance should be associated with the specified option group.
            Permanent options, such as the TDE option for Oracle Advanced Security TDE, cannot be removed from an option group, and that option group cannot be removed from a DB instance once it is associated with a DB instance
            

    :type CharacterSetName: string
    :param CharacterSetName: For supported engines, indicates that the DB instance should be associated with the specified CharacterSet.

    :type PubliclyAccessible: boolean
    :param PubliclyAccessible: Specifies the accessibility options for the DB instance. A value of true specifies an Internet-facing instance with a publicly resolvable DNS name, which resolves to a public IP address. A value of false specifies an internal instance with a DNS name that resolves to a private IP address.
            Default: The default behavior varies depending on whether a VPC has been requested or not. The following list shows the default behavior in each case.
            Default VPC: true
            VPC: false
            If no DB subnet group has been specified as part of the request and the PubliclyAccessible value has not been set, the DB instance will be publicly accessible. If a specific DB subnet group has been specified as part of the request and the PubliclyAccessible value has not been set, the DB instance will be private.
            

    :type Tags: list
    :param Tags: A list of tags.
            (dict) --Metadata assigned to an Amazon RDS resource consisting of a key-value pair.
            Key (string) --A key is the required name of the tag. The string value can be from 1 to 128 Unicode characters in length and cannot be prefixed with 'aws:' or 'rds:'. The string can only contain only the set of Unicode letters, digits, white-space, '_', '.', '/', '=', '+', '-' (Java regex: '^([\\p{L}\\p{Z}\\p{N}_.:/=+\\-]*)$').
            Value (string) --A value is the optional value of the tag. The string value can be from 1 to 256 Unicode characters in length and cannot be prefixed with 'aws:' or 'rds:'. The string can only contain only the set of Unicode letters, digits, white-space, '_', '.', '/', '=', '+', '-' (Java regex: '^([\\p{L}\\p{Z}\\p{N}_.:/=+\\-]*)$').
            
            

    :type DBClusterIdentifier: string
    :param DBClusterIdentifier: The identifier of the DB cluster that the instance will belong to.
            For information on creating a DB cluster, see CreateDBCluster .
            Type: String
            

    :type StorageType: string
    :param StorageType: Specifies the storage type to be associated with the DB instance.
            Valid values: standard | gp2 | io1
            If you specify io1 , you must also include a value for the Iops parameter.
            Default: io1 if the Iops parameter is specified; otherwise standard
            

    :type TdeCredentialArn: string
    :param TdeCredentialArn: The ARN from the Key Store with which to associate the instance for TDE encryption.

    :type TdeCredentialPassword: string
    :param TdeCredentialPassword: The password for the given ARN from the Key Store in order to access the device.

    :type StorageEncrypted: boolean
    :param StorageEncrypted: Specifies whether the DB instance is encrypted.
            Default: false
            

    :type KmsKeyId: string
    :param KmsKeyId: The KMS key identifier for an encrypted DB instance.
            The KMS key identifier is the Amazon Resource Name (ARN) for the KMS encryption key. If you are creating a DB instance with the same AWS account that owns the KMS encryption key used to encrypt the new DB instance, then you can use the KMS key alias instead of the ARN for the KM encryption key.
            If the StorageEncrypted parameter is true, and you do not specify a value for the KmsKeyId parameter, then Amazon RDS will use your default encryption key. AWS KMS creates the default encryption key for your AWS account. Your AWS account has a different default encryption key for each AWS region.
            

    :type Domain: string
    :param Domain: Specify the Active Directory Domain to create the instance in.

    :type CopyTagsToSnapshot: boolean
    :param CopyTagsToSnapshot: True to copy all tags from the DB instance to snapshots of the DB instance; otherwise false. The default is false.

    :type MonitoringInterval: integer
    :param MonitoringInterval: The interval, in seconds, between points when Enhanced Monitoring metrics are collected for the DB instance. To disable collecting Enhanced Monitoring metrics, specify 0. The default is 0.
            If MonitoringRoleArn is specified, then you must also set MonitoringInterval to a value other than 0.
            Valid Values: 0, 1, 5, 10, 15, 30, 60
            

    :type MonitoringRoleArn: string
    :param MonitoringRoleArn: The ARN for the IAM role that permits RDS to send enhanced monitoring metrics to CloudWatch Logs. For example, arn:aws:iam:123456789012:role/emaccess . For information on creating a monitoring role, go to Setting Up and Enabling Enhanced Monitoring .
            If MonitoringInterval is set to a value other than 0, then you must supply a MonitoringRoleArn value.
            

    :type DomainIAMRoleName: string
    :param DomainIAMRoleName: Specify the name of the IAM role to be used when making API calls to the Directory Service.

    :type PromotionTier: integer
    :param PromotionTier: A value that specifies the order in which an Aurora Replica is promoted to the primary instance after a failure of the existing primary instance. For more information, see Fault Tolerance for an Aurora DB Cluster .
            Default: 1
            Valid Values: 0 - 15
            

    :type Timezone: string
    :param Timezone: The time zone of the DB instance. The time zone parameter is currently supported only by Microsoft SQL Server .

    :type EnableIAMDatabaseAuthentication: boolean
    :param EnableIAMDatabaseAuthentication: True to enable mapping of AWS Identity and Access Management (IAM) accounts to database accounts; otherwise false.
            You can enable IAM database authentication for the following database engines
            For MySQL 5.6, minor version 5.6.34 or higher
            For MySQL 5.7, minor version 5.7.16 or higher
            Default: false
            

    :rtype: dict
    :return: {
        'DBInstance': {
            'DBInstanceIdentifier': 'string',
            'DBInstanceClass': 'string',
            'Engine': 'string',
            'DBInstanceStatus': 'string',
            'MasterUsername': 'string',
            'DBName': 'string',
            'Endpoint': {
                'Address': 'string',
                'Port': 123,
                'HostedZoneId': 'string'
            },
            'AllocatedStorage': 123,
            'InstanceCreateTime': datetime(2015, 1, 1),
            'PreferredBackupWindow': 'string',
            'BackupRetentionPeriod': 123,
            'DBSecurityGroups': [
                {
                    'DBSecurityGroupName': 'string',
                    'Status': 'string'
                },
            ],
            'VpcSecurityGroups': [
                {
                    'VpcSecurityGroupId': 'string',
                    'Status': 'string'
                },
            ],
            'DBParameterGroups': [
                {
                    'DBParameterGroupName': 'string',
                    'ParameterApplyStatus': 'string'
                },
            ],
            'AvailabilityZone': 'string',
            'DBSubnetGroup': {
                'DBSubnetGroupName': 'string',
                'DBSubnetGroupDescription': 'string',
                'VpcId': 'string',
                'SubnetGroupStatus': 'string',
                'Subnets': [
                    {
                        'SubnetIdentifier': 'string',
                        'SubnetAvailabilityZone': {
                            'Name': 'string'
                        },
                        'SubnetStatus': 'string'
                    },
                ],
                'DBSubnetGroupArn': 'string'
            },
            'PreferredMaintenanceWindow': 'string',
            'PendingModifiedValues': {
                'DBInstanceClass': 'string',
                'AllocatedStorage': 123,
                'MasterUserPassword': 'string',
                'Port': 123,
                'BackupRetentionPeriod': 123,
                'MultiAZ': True|False,
                'EngineVersion': 'string',
                'LicenseModel': 'string',
                'Iops': 123,
                'DBInstanceIdentifier': 'string',
                'StorageType': 'string',
                'CACertificateIdentifier': 'string',
                'DBSubnetGroupName': 'string'
            },
            'LatestRestorableTime': datetime(2015, 1, 1),
            'MultiAZ': True|False,
            'EngineVersion': 'string',
            'AutoMinorVersionUpgrade': True|False,
            'ReadReplicaSourceDBInstanceIdentifier': 'string',
            'ReadReplicaDBInstanceIdentifiers': [
                'string',
            ],
            'ReadReplicaDBClusterIdentifiers': [
                'string',
            ],
            'LicenseModel': 'string',
            'Iops': 123,
            'OptionGroupMemberships': [
                {
                    'OptionGroupName': 'string',
                    'Status': 'string'
                },
            ],
            'CharacterSetName': 'string',
            'SecondaryAvailabilityZone': 'string',
            'PubliclyAccessible': True|False,
            'StatusInfos': [
                {
                    'StatusType': 'string',
                    'Normal': True|False,
                    'Status': 'string',
                    'Message': 'string'
                },
            ],
            'StorageType': 'string',
            'TdeCredentialArn': 'string',
            'DbInstancePort': 123,
            'DBClusterIdentifier': 'string',
            'StorageEncrypted': True|False,
            'KmsKeyId': 'string',
            'DbiResourceId': 'string',
            'CACertificateIdentifier': 'string',
            'DomainMemberships': [
                {
                    'Domain': 'string',
                    'Status': 'string',
                    'FQDN': 'string',
                    'IAMRoleName': 'string'
                },
            ],
            'CopyTagsToSnapshot': True|False,
            'MonitoringInterval': 123,
            'EnhancedMonitoringResourceArn': 'string',
            'MonitoringRoleArn': 'string',
            'PromotionTier': 123,
            'DBInstanceArn': 'string',
            'Timezone': 'string',
            'IAMDatabaseAuthenticationEnabled': True|False
        }
    }
    
    
    :returns: 
    CreateDBInstance
    DeleteDBInstance
    ModifyDBInstance
    
    """
    pass
