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Amazon Relational Database Service (or Amazon RDS) is a distributed relational database service by Amazon Web Services (AWS). [2] It is a web service running "in the cloud" designed to simplify the setup, operation, and scaling of a relational database for use in applications. [ 3 ]
Amazon Simple Queue Service (Amazon SQS) is a distributed message queuing service introduced by Amazon.com as a beta in late 2004, and generally available in mid 2006. [ 1 ] [ 2 ] It supports programmatic sending of messages via web service applications as a way to communicate over the Internet.
AWS launches Simple Notification Service (SNS), a tool to allow developers to push messages generated from an application to other systems and people (by methods such as email or webhooks). [39] 2010: April 29: Regional diversification: AWS launches a region, called ap-southeast-1, in Singapore. This is its first region in the Asia-Pacific, and ...
Amazon Aurora is a proprietary relational database offered as a service by Amazon Web Services (AWS) since October 2014. [ 1 ] [ 2 ] Aurora is available as part of the Amazon Relational Database Service (RDS).
Earliest deadline first (EDF) or least time to go is a dynamic priority scheduling algorithm used in real-time operating systems to place processes in a priority queue. Whenever a scheduling event occurs (task finishes, new task released, etc.) the queue will be searched for the process closest to its deadline.
Multi-master replication can also be contrasted with failover clustering where passive replica servers are replicating the master data in order to prepare for takeover in the event that the master stops functioning. The master is the only server active for client interaction.
High-availability clusters (also known as HA clusters, fail-over clusters) are groups of computers that support server applications that can be reliably utilized with a minimum amount of down-time. They operate by using high availability software to harness redundant computers in groups or clusters that provide continued service when system ...
Fair queuing uses one queue per packet flow and services them in rotation, such that each flow can "obtain an equal fraction of the resources". [1] [2]The advantage over conventional first in first out (FIFO) or priority queuing is that a high-data-rate flow, consisting of large packets or many data packets, cannot take more than its fair share of the link capacity.