AWS Snowball User Guide
takes time for the data to propagate to all storage locations. To support varied
application requirements, Amazon DynamoDB (p. 110) supports both eventually
consistent and strongly consistent reads.
See Also eventual consistency, eventually consistent read, strongly consistent
read.
data node Amazon Elasticsearch Service (Amazon ES) (p. 111): An Elasticsearch instance
that holds data and responds to data upload requests.
See Also dedicated master node, 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 (p. 119), valid data
sources include an instance (p. 136) for a stack’s MySQL layer or a stack’s
Amazon RDS (p. 113) service layer. In Amazon Redshift (p. 113), valid data
sources include text files in an Amazon S3 (p. 113) bucket (p. 122), in an
Amazon EMR (p. 111) 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 (p. 127).
database name The name of a database hosted in a DB instance (p. 127). 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 (p. 112): 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 (p. 147).
DB parameter group A container for database engine parameter values that apply to one or more DB
instance (p. 127)s.
DB security group A method that controls access to the DB instance (p. 127). By default, network
access is turned off to DB instances. After ingress is configured for a security
group (p. 151), the same rules apply to all DB instances associated with that
group.
DB snapshot A user-initiated point backup of a DB instance (p. 127).
Dedicated Host A physical server with EC2 instance (p. 129) capacity fully dedicated to a user.
Dedicated Instance An instance (p. 136) that is physically isolated at the host hardware level and
launched within a VPC (p. 159).
dedicated master node Amazon Elasticsearch Service (Amazon ES) (p. 111): An Elasticsearch instance
that performs cluster management tasks, but does not hold data or respond to
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