AWS Snowball User Guide
marker See pagination token.
master node A process running on an Amazon Machine Image (AMI) (p. 112) that keeps track
of the work its core and task nodes complete.
maximum price The maximum price you will pay to launch one or more Spot Instance (p. 153)s.
If your maximum price exceeds the current Spot price (p. 153) and your
restrictions are met, Amazon EC2 (p. 111) launches instances on your behalf.
maximum send rate The maximum number of email messages that you can send per second using
Amazon SES (p. 113).
mebibyte A contraction of mega binary byte, a mebibyte is 2^20 or 1,048,576 bytes. A
megabyte (MB) is 10^6 or 1,000,000 bytes. 1,024 MiB is a gibibyte (p. 133).
member resources See resource.
message ID Amazon Simple Email Service (Amazon SES) (p. 113): A unique identifier that is
assigned to every email message that is sent.
Amazon Simple Queue Service (Amazon SQS) (p. 113): The identifier returned
when you send a message to a queue.
metadata Information about other data or objects. In Amazon Simple Storage Service
(Amazon S3) (p. 113) and Amazon EMR (Amazon EMR) (p. 111) metadata takes
the form of name–value pairs that describe the object. These include default
metadata such as the date last modified and standard HTTP metadata such as
Content-Type. Users can also specify custom metadata at the time they store
an object. In Amazon Elastic Compute Cloud (Amazon EC2) (p. 111) metadata
includes data about an EC2 instance (p. 129) that the instance can retrieve to
determine things about itself, such as the instance type, the IP address, and so on.
metric An element of time-series data defined by a unique combination of exactly
one namespace (p. 141), exactly one metric name, and between zero and ten
dimensions. Metrics and the statistics derived from them are the basis of Amazon
CloudWatch (p. 110).
metric name The primary identifier of a metric, used in combination with a
namespace (p. 141) and optional dimensions.
MFA See multi-factor authentication (MFA).
micro instance A type of EC2 instance (p. 129) that is more economical to use if you have
occasional bursts of high CPU activity.
MIME See Multipurpose Internet Mail Extensions (MIME).
ML model In machine learning (ML), a mathematical model that generates predictions by
finding patterns in data. Amazon Machine Learning supports three types of ML
models: binary classification, multiclass classification, and regression. Also known
as a predictive model.
See Also binary classification model, multiclass classification model, regression
model.
MTA See Mail Transfer Agent (MTA).
Multi-AZ deployment A primary DB instance (p. 127) that has a synchronous standby replica in a
different Availability Zone (p. 116). The primary DB instance is synchronously
replicated across Availability Zones to the standby replica.
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