D Flashcards
dashboard
See service health dashboard.
data consistency
A concept that describes when data is written or updated successfully and all copies of the data are updated in all AWS regions. However, it takes time for the data to propagate to all storage locations. To support varied application requirements, Amazon DynamoDB supports both eventually consistent and strongly consistent reads.
See Also eventual consistency.
See Also eventually consistent read.
See Also strongly consistent read.
data node
Amazon Elasticsearch Service (Amazon ES): An Elasticsearch instance that holds data and responds to data upload requests.
See Also dedicated master node.
See Also node.
data schema
See schema.
data source
The database, file, or repository that provides information required by an application or database. For example, in AWS OpsWorks, valid data sources include an instance for a stack’s MySQL layer or a stack’s Amazon RDS service layer. In Amazon Redshift , valid data sources include text files in an Amazon S3 bucket, in an Amazon EMR cluster, or on a remote host that a cluster can access through an SSH connection.
See Also datasource.
database engine
The database software and version running on the DB instance.
database name
The name of a database hosted in a DB instance. A DB instance can host multiple databases, but databases hosted by the same DB instance must each have a unique name within that instance.
datasource
Amazon Machine Learning: An object that contains metadata about the input data. Amazon ML reads the input data, computes descriptive statistics on its attributes, and stores the statistics—along with a schema and other information—as part of the datasource object. Amazon ML uses datasources to train and evaluate a machine learning model and generate batch predictions.
See Also data source.
DB compute class
Size of the database compute platform used to run the instance.
DB instance
An isolated database environment running in the cloud. A DB instance can contain multiple user-created databases.
DB instance identifier
User-supplied identifier for the DB instance. The identifier must be unique for that user in an AWS region.
DB parameter group
A container for database engine parameter values that apply to one or more DB instances.
DB security group
A method that controls access to the DB instance. By default, network access is turned off to DB instances. After ingress is configured for a security group, the same rules apply to all DB instances associated with that group.
DB snapshot
A user-initiated point backup of a DB instance.
Dedicated Host
A physical server with EC2 instance capacity fully dedicated to a user.
Dedicated Instance
An instance that is physically isolated at the host hardware level and launched within a VPC.
dedicated master node
Amazon Elasticsearch Service (Amazon ES): An Elasticsearch instance that performs cluster management tasks, but does not hold data or respond to data upload requests. Amazon Elasticsearch Service (Amazon ES) uses dedicated master nodes to increase cluster stability.
See Also data node.
See Also node.
Dedicated Reserved Instance
An option that you purchase to guarantee that sufficient capacity will be available to launch Dedicated Instances into a VPC.
delegation
Within a single AWS account: Giving AWS users access to resources in your AWS account.
Between two AWS accounts: Setting up a trust between the account that owns the resource (the trusting account), and the account that contains the users that need to access the resource (the trusted account).
See Also trust policy.
delete marker
An object with a key and version ID, but without content. Amazon S3 inserts delete markers automatically into versioned buckets when an object is deleted.
deliverability
The likelihood that an email message will arrive at its intended destination.
deliveries
The number of email messages, sent through Amazon SES, that were accepted by an internet service provider for delivery to recipients over a period of time.
deny
The result of a policy statement that includes deny as the effect, so that a specific action or actions are expressly forbidden for a user, group, or role. Explicit deny take precedence over explicit allow.
deployment configuration
AWS CodeDeploy: A set of deployment rules and success and failure conditions used by the service during a deployment.
deployment group
AWS CodeDeploy: A set of individually tagged instances, EC2 instances in Auto Scaling groups, or both.
detailed monitoring
Monitoring of AWS provided metrics derived at a 1-minute frequency.
Description property
A property added to parameters, resources, resource properties, mappings, and outputs to help you to document AWS CloudFormation template elements.
dimension
A name–value pair (for example, InstanceType=m1.small, or EngineName=mysql), that contains additional information to identify a metric.
discussion forums
A place where AWS users can post technical questions and feedback to help accelerate their development efforts and to engage with the AWS community. The discussion forums are located at https://aws.amazon.com/forums/.
distribution
A link between an origin server (such as an Amazon S3 bucket) and a domain name, which CloudFront automatically assigns. Through this link, CloudFront identifies the object you have stored in your origin server.
DKIM
DomainKeys Identified Mail. A standard that email senders use to sign their messages. ISPs use those signatures to verify that messages are legitimate. For more information, see http://www.dkim.org.
DNS
See Domain Name System.
Docker image
A layered file system template that is the basis of a Docker container. Docker images can comprise specific operating systems or applications.
document
Amazon CloudSearch: An item that can be returned as a search result. Each document has a collection of fields that contain the data that can be searched or returned. The value of a field can be either a string or a number. Each document must have a unique ID and at least one field.
document batch
Amazon CloudSearch: A collection of add and delete document operations. You use the document service API to submit batches to update the data in your search domain.
document service API
Amazon CloudSearch: The API call that you use to submit document batches to update the data in a search domain.
document service endpoint
Amazon CloudSearch: The URL that you connect to when sending document updates to an Amazon CloudSearch domain. Each search domain has a unique document service endpoint that remains the same for the life of the domain.
domain
Amazon Elasticsearch Service (Amazon ES): The hardware, software, and data exposed by Amazon Elasticsearch Service (Amazon ES) endpoints. An Amazon ES domain is a service wrapper around an Elasticsearch cluster. An Amazon ES domain encapsulates the engine instances that process Amazon ES requests, the indexed data that you want to search, snapshots of the domain, access policies, and metadata.
See Also cluster.
See Also Elasticsearch.
Domain Name System
A service that routes internet traffic to websites by translating friendly domain names like www.example.com into the numeric IP addresses like 192.0.2.1 that computers use to connect to each other.
Donation button
An HTML-coded button to provide an easy and secure way for US-based, IRS-certified 501(c)3 nonprofit organizations to solicit donations.
DynamoDB stream
An ordered flow of information about changes to items in anAmazon DynamoDB table. When you enable a stream on a table, DynamoDB captures information about every modification to data items in the table.
See Also Amazon DynamoDB Streams.
