def create_db_instance(options = {})
      resp = @client.create_db_instance(options)
      DBInstance.new(
        id: resp.data.db_instance.db_instance_identifier,
        data: resp.data.db_instance,
        client: @client
      )
    end
def create_db_instance(options = {})
      resp = @client.create_db_instance(options)
      DBInstance.new(
        id: resp.data.db_instance.db_instance_identifier,
        data: resp.data.db_instance,
        client: @client
      )
    end
@example Request syntax with placeholder values

   dbinstance = rds.create_db_instance({
     db_name: "String",
     db_instance_identifier: "String", # required
     allocated_storage: 1,
     db_instance_class: "String", # required
     engine: "String", # required
     master_username: "String",
     master_user_password: "String",
     db_security_groups: ["String"],
     vpc_security_group_ids: ["String"],
     availability_zone: "String",
     db_subnet_group_name: "String",
     preferred_maintenance_window: "String",
     db_parameter_group_name: "String",
     backup_retention_period: 1,
     preferred_backup_window: "String",
     port: 1,
     multi_az: false,
     engine_version: "String",
     auto_minor_version_upgrade: false,
     license_model: "String",
     iops: 1,
     option_group_name: "String",
     character_set_name: "String",
     publicly_accessible: false,
     tags: [
       {
         key: "String",
         value: "String",
       },
     ],
     db_cluster_identifier: "String",
     storage_type: "String",
     tde_credential_arn: "String",
     tde_credential_password: "String",
     storage_encrypted: false,
     kms_key_id: "String",
     domain: "String",
     copy_tags_to_snapshot: false,
     monitoring_interval: 1,
     monitoring_role_arn: "String",
     domain_iam_role_name: "String",
     promotion_tier: 1,
     timezone: "String",
     enable_iam_database_authentication: false,
     enable_performance_insights: false,
     performance_insights_kms_key_id: "String",
     performance_insights_retention_period: 1,
     enable_cloudwatch_logs_exports: ["String"],
     processor_features: [
       {
         name: "String",
         value: "String",
       },
     ],
     deletion_protection: false,
   })
 @param [Hash] options ({})
 @option options [String] :db_name
   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 letters or numbers.

   * Can't 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 letters or numbers.

   * Can't 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 letters, numbers, or underscores.

   * Must begin with a letter or an underscore. Subsequent characters can
     be letters, underscores, or digits (0-9).

   * Can't 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:

   * Can't 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 letters or numbers.

   * Can't be a word reserved by the specified database engine
 @option options [required, String] :db_instance_identifier
   The DB instance identifier. This parameter is stored as a lowercase
   string.

   Constraints:

   * Must contain from 1 to 63 letters, numbers, or hyphens.

   * First character must be a letter.

   * Can't end with a hyphen or contain two consecutive hyphens.

   Example: `mydbinstance`
 @option options [Integer] :allocated_storage
   The amount of storage (in gibibytes) to allocate for the DB 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 to the amount of storage for each storage type are the
   following:

   * General Purpose (SSD) storage (gp2): Must be an integer from 20 to
     32768.

   * Provisioned IOPS storage (io1): Must be an integer from 100 to
     32768.

   * Magnetic storage (standard): Must be an integer from 5 to 3072.

   **MariaDB**

   Constraints to the amount of storage for each storage type are the
   following:

   * General Purpose (SSD) storage (gp2): Must be an integer from 20 to
     32768.

   * Provisioned IOPS storage (io1): Must be an integer from 100 to
     32768.

   * Magnetic storage (standard): Must be an integer from 5 to 3072.

   **PostgreSQL**

   Constraints to the amount of storage for each storage type are the
   following:

   * General Purpose (SSD) storage (gp2): Must be an integer from 20 to
     32768.

   * Provisioned IOPS storage (io1): Must be an integer from 100 to
     32768.

   * Magnetic storage (standard): Must be an integer from 5 to 3072.

   **Oracle**

   Constraints to the amount of storage for each storage type are the
   following:

   * General Purpose (SSD) storage (gp2): Must be an integer from 20 to
     32768.

   * Provisioned IOPS storage (io1): Must be an integer from 100 to
     32768.

   * Magnetic storage (standard): Must be an integer from 10 to 3072.

   **SQL Server**

   Constraints to the amount of storage for each storage type are the
   following:

   * General Purpose (SSD) storage (gp2):

     * Enterprise and Standard editions: Must be an integer from 200 to
       16384.

     * Web and Express editions: Must be an integer from 20 to 16384.

   * Provisioned IOPS storage (io1):

     * Enterprise and Standard editions: Must be an integer from 200 to
       16384.

     * Web and Express editions: Must be an integer from 100 to 16384.

   * Magnetic storage (standard):

     * Enterprise and Standard editions: Must be an integer from 200 to
       1024.

     * Web and Express editions: Must be an integer from 20 to 1024.
 @option options [required, String] :db_instance_class
   The compute and memory capacity of the DB instance, for example,
   `db.m4.large`. Not all DB instance classes are available in all AWS
   Regions, or for all database engines. For the full list of DB instance
   classes, and availability for your engine, see [DB Instance Class][1]
   in the *Amazon RDS User Guide.*



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.DBInstanceClass.html
 @option options [required, String] :engine
   The name of the database engine to be used for this instance.

   Not every database engine is available for every AWS Region.

   Valid Values:

   * `aurora` (for MySQL 5.6-compatible Aurora)

   * `aurora-mysql` (for MySQL 5.7-compatible Aurora)

   * `aurora-postgresql`

   * `mariadb`

   * `mysql`

   * `oracle-ee`

   * `oracle-se2`

   * `oracle-se1`

   * `oracle-se`

   * `postgres`

   * `sqlserver-ee`

   * `sqlserver-se`

   * `sqlserver-ex`

   * `sqlserver-web`
 @option options [String] :master_username
   The name for the master user.

   **Amazon Aurora**

   Not applicable. The name for the master user is managed by the DB
   cluster. For more information, see CreateDBCluster.

   **MariaDB**

   Constraints:

   * Required for MariaDB.

   * Must be 1 to 16 letters or numbers.

   * Can't be a reserved word for the chosen database engine.

   **Microsoft SQL Server**

   Constraints:

   * Required for SQL Server.

   * Must be 1 to 128 letters or numbers.

   * The first character must be a letter.

   * Can't be a reserved word for the chosen database engine.

   **MySQL**

   Constraints:

   * Required for MySQL.

   * Must be 1 to 16 letters or numbers.

   * First character must be a letter.

   * Can't be a reserved word for the chosen database engine.

   **Oracle**

   Constraints:

   * Required for Oracle.

   * Must be 1 to 30 letters or numbers.

   * First character must be a letter.

   * Can't be a reserved word for the chosen database engine.

   **PostgreSQL**

   Constraints:

   * Required for PostgreSQL.

   * Must be 1 to 63 letters or numbers.

   * First character must be a letter.

   * Can't be a reserved word for the chosen database engine.
 @option options [String] :master_user_password
   The password for the master user. The password can include any
   printable ASCII character except "/", """, or "@".

   **Amazon Aurora**

   Not applicable. The password for the master user is managed by the DB
   cluster. For more information, see CreateDBCluster.

   **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.
 @option options [Array<String>] :db_security_groups
   A list of DB security groups to associate with this DB instance.

   Default: The default DB security group for the database engine.
 @option options [Array<String>] :vpc_security_group_ids
   A list of Amazon EC2 VPC security groups to associate with this DB
   instance.

   **Amazon Aurora**

   Not applicable. The associated list of EC2 VPC security groups is
   managed by the DB cluster. For more information, see CreateDBCluster.

   Default: The default EC2 VPC security group for the DB subnet group's
   VPC.
 @option options [String] :availability_zone
   The EC2 Availability Zone that the DB instance is created in. For
   information on AWS Regions and Availability Zones, see [Regions and
   Availability Zones][1].

   Default: A random, system-chosen Availability Zone in the endpoint's
   AWS Region.

   Example: `us-east-1d`

   Constraint: The AvailabilityZone parameter can't be specified if the
   MultiAZ parameter is set to `true`. The specified Availability Zone
   must be in the same AWS Region as the current endpoint.



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.RegionsAndAvailabilityZones.html
 @option options [String] :db_subnet_group_name
   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.
 @option options [String] :preferred_maintenance_window
   The time range each week during which system maintenance can occur, in
   Universal Coordinated Time (UTC). For more information, see [Amazon
   RDS Maintenance Window][1].

   Format: `ddd:hh24:mi-ddd:hh24:mi`

   The default is a 30-minute window selected at random from an 8-hour
   block of time for each AWS Region, occurring on a random day of the
   week.

   Valid Days: Mon, Tue, Wed, Thu, Fri, Sat, Sun.

   Constraints: Minimum 30-minute window.



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_UpgradeDBInstance.Maintenance.html#Concepts.DBMaintenance
 @option options [String] :db_parameter_group_name
   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 is used.

   Constraints:

   * Must be 1 to 255 letters, numbers, or hyphens.

   * First character must be a letter

   * Can't end with a hyphen or contain two consecutive hyphens
 @option options [Integer] :backup_retention_period
   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.

   **Amazon Aurora**

   Not applicable. The retention period for automated backups is managed
   by the DB cluster. For more information, see CreateDBCluster.

   Default: 1

   Constraints:

   * Must be a value from 0 to 35

   * Can't be set to 0 if the DB instance is a source to Read Replicas
 @option options [String] :preferred_backup_window
   The daily time range during which automated backups are created if
   automated backups are enabled, using the `BackupRetentionPeriod`
   parameter. For more information, see [The Backup Window][1] in the
   *Amazon RDS User Guide*.

   **Amazon Aurora**

   Not applicable. The daily time range for creating automated backups is
   managed by the DB cluster. For more information, see CreateDBCluster.

   The default is a 30-minute window selected at random from an 8-hour
   block of time for each AWS Region. To see the time blocks available,
   see [ Adjusting the Preferred DB Instance Maintenance Window][2] in
   the *Amazon RDS User Guide*.

   Constraints:

   * Must be in the format `hh24:mi-hh24:mi`.

   * Must be in Universal Coordinated Time (UTC).

   * Must not conflict with the preferred maintenance window.

   * Must be at least 30 minutes.



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_WorkingWithAutomatedBackups.html#USER_WorkingWithAutomatedBackups.BackupWindow
   [2]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_UpgradeDBInstance.Maintenance.html#AdjustingTheMaintenanceWindow
 @option options [Integer] :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
 @option options [Boolean] :multi_az
   A value that specifies whether the DB instance is a Multi-AZ
   deployment. You can't set the AvailabilityZone parameter if the
   MultiAZ parameter is set to true.
 @option options [String] :engine_version
   The version number of the database engine to use.

   For a list of valid engine versions, call DescribeDBEngineVersions.

   The following are the database engines and links to information about
   the major and minor versions that are available with Amazon RDS. Not
   every database engine is available for every AWS Region.

   **Amazon Aurora**

   Not applicable. The version number of the database engine to be used
   by the DB instance is managed by the DB cluster. For more information,
   see CreateDBCluster.

   **MariaDB**

   See [MariaDB on Amazon RDS Versions][1] in the *Amazon RDS User
   Guide.*

   **Microsoft SQL Server**

   See [Version and Feature Support on Amazon RDS][2] in the *Amazon RDS
   User Guide.*

   **MySQL**

   See [MySQL on Amazon RDS Versions][3] in the *Amazon RDS User Guide.*

   **Oracle**

   See [Oracle Database Engine Release Notes][4] in the *Amazon RDS User
   Guide.*

   **PostgreSQL**

   See [Supported PostgreSQL Database Versions][5] in the *Amazon RDS
   User Guide.*



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_MariaDB.html#MariaDB.Concepts.VersionMgmt
   [2]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_SQLServer.html#SQLServer.Concepts.General.FeatureSupport
   [3]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_MySQL.html#MySQL.Concepts.VersionMgmt
   [4]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Appendix.Oracle.PatchComposition.html
   [5]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_PostgreSQL.html#PostgreSQL.Concepts.General.DBVersions
 @option options [Boolean] :auto_minor_version_upgrade
   Indicates that minor engine upgrades are applied automatically to the
   DB instance during the maintenance window.

   Default: `true`
 @option options [String] :license_model
   License model information for this DB instance.

   Valid values: `license-included` \| `bring-your-own-license` \|
   `general-public-license`
 @option options [Integer] :iops
   The amount of Provisioned IOPS (input/output operations per second) to
   be initially allocated for the DB instance. For information about
   valid Iops values, see see [Amazon RDS Provisioned IOPS Storage to
   Improve Performance][1] in the *Amazon RDS User Guide*.

   Constraints: Must be a multiple between 1 and 50 of the storage amount
   for the DB instance.



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Storage.html#USER_PIOPS
 @option options [String] :option_group_name
   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, can't be removed from an option group, and that option group
   can't be removed from a DB instance once it is associated with a DB
   instance
 @option options [String] :character_set_name
   For supported engines, indicates that the DB instance should be
   associated with the specified CharacterSet.

   **Amazon Aurora**

   Not applicable. The character set is managed by the DB cluster. For
   more information, see CreateDBCluster.
 @option options [Boolean] :publicly_accessible
   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
   `DBSubnetGroupName` is specified.

   If `DBSubnetGroupName` is not specified, and `PubliclyAccessible` is
   not specified, the following applies:

   * If the default VPC in the target region doesn’t have an Internet
     gateway attached to it, the DB instance is private.

   * If the default VPC in the target region has an Internet gateway
     attached to it, the DB instance is public.

   If `DBSubnetGroupName` is specified, and `PubliclyAccessible` is not
   specified, the following applies:

   * If the subnets are part of a VPC that doesn’t have an Internet
     gateway attached to it, the DB instance is private.

   * If the subnets are part of a VPC that has an Internet gateway
     attached to it, the DB instance is public.
 @option options [Array<Types::Tag>] :tags
   A list of tags. For more information, see [Tagging Amazon RDS
   Resources][1] in the *Amazon RDS User Guide.*



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_Tagging.html
 @option options [String] :db_cluster_identifier
   The identifier of the DB cluster that the instance will belong to.

   For information on creating a DB cluster, see CreateDBCluster.

   Type: String
 @option options [String] :storage_type
   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`
 @option options [String] :tde_credential_arn
   The ARN from the key store with which to associate the instance for
   TDE encryption.
 @option options [String] :tde_credential_password
   The password for the given ARN from the key store in order to access
   the device.
 @option options [Boolean] :storage_encrypted
   Specifies whether the DB instance is encrypted.

   **Amazon Aurora**

   Not applicable. The encryption for DB instances is managed by the DB
   cluster. For more information, see CreateDBCluster.

   Default: false
 @option options [String] :kms_key_id
   The AWS 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.

   **Amazon Aurora**

   Not applicable. The KMS key identifier is managed by the DB cluster.
   For more information, see CreateDBCluster.

   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.
 @option options [String] :domain
   Specify the Active Directory Domain to create the instance in.
 @option options [Boolean] :copy_tags_to_snapshot
   True to copy all tags from the DB instance to snapshots of the DB
   instance, and otherwise false. The default is false.

   **Amazon Aurora**

   Not applicable. Copying tags to snapshots is managed by the DB
   cluster. Setting this value for an Aurora DB instance has no effect on
   the DB cluster setting. For more information, see CreateDBCluster.
 @option options [Integer] :monitoring_interval
   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`
 @option options [String] :monitoring_role_arn
   The ARN for the IAM role that permits RDS to send enhanced monitoring
   metrics to Amazon 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][1] in the *Amazon RDS User Guide*.

   If `MonitoringInterval` is set to a value other than 0, then you must
   supply a `MonitoringRoleArn` value.



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_Monitoring.OS.html#USER_Monitoring.OS.Enabling
 @option options [String] :domain_iam_role_name
   Specify the name of the IAM role to be used when making API calls to
   the Directory Service.
 @option options [Integer] :promotion_tier
   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][1] in the *Amazon Aurora User Guide*.

   Default: 1

   Valid Values: 0 - 15



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/Aurora.Managing.Backups.html#Aurora.Managing.FaultTolerance
 @option options [String] :timezone
   The time zone of the DB instance. The time zone parameter is currently
   supported only by [Microsoft SQL Server][1].



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_SQLServer.html#SQLServer.Concepts.General.TimeZone
 @option options [Boolean] :enable_iam_database_authentication
   True to enable mapping of AWS Identity and Access Management (IAM)
   accounts to database accounts, and otherwise false.

   You can enable IAM database authentication for the following database
   engines:

   **Amazon Aurora**

   Not applicable. Mapping AWS IAM accounts to database accounts is
   managed by the DB cluster. For more information, see CreateDBCluster.

   **MySQL**

   * For MySQL 5.6, minor version 5.6.34 or higher

   * For MySQL 5.7, minor version 5.7.16 or higher

   Default: `false`
 @option options [Boolean] :enable_performance_insights
   True to enable Performance Insights for the DB instance, and otherwise
   false.

   For more information, see [Using Amazon Performance Insights][1] in
   the *Amazon Relational Database Service User Guide*.



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PerfInsights.html
 @option options [String] :performance_insights_kms_key_id
   The AWS KMS key identifier for encryption of Performance Insights
   data. The KMS key ID is the Amazon Resource Name (ARN), KMS key
   identifier, or the KMS key alias for the KMS encryption key.
 @option options [Integer] :performance_insights_retention_period
   The amount of time, in days, to retain Performance Insights data.
   Valid values are 7 or 731 (2 years).
 @option options [Array<String>] :enable_cloudwatch_logs_exports
   The list of log types that need to be enabled for exporting to
   CloudWatch Logs. The values in the list depend on the DB engine being
   used. For more information, see [Publishing Database Logs to Amazon
   CloudWatch Logs ][1] in the *Amazon Relational Database Service User
   Guide*.



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_LogAccess.html#USER_LogAccess.Procedural.UploadtoCloudWatch
 @option options [Array<Types::ProcessorFeature>] :processor_features
   The number of CPU cores and the number of threads per core for the DB
   instance class of the DB instance.
 @option options [Boolean] :deletion_protection
   Indicates if the DB instance should have deletion protection enabled.
   The database can't be deleted when this value is set to true. The
   default is false. For more information, see [ Deleting a DB
   Instance][1].



   [1]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_DeleteInstance.html
 @return [DBInstance]