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The ability to specify an arbitrary list of labels and to query based on these in real time is why Prometheus' data model is called multi-dimensional. [16] [8] [9] Prometheus stores data locally on disk, which helps for fast data storage and fast querying. [8] There is the ability to store metrics in remote storage. [17]
Redis popularized the idea of a system that can be considered a store and a cache at the same time. It was designed so that data is always modified and read from the main computer memory, but also stored on disk in a format that is unsuitable for random data access.
Apache HBase began as a project by the company Powerset out of a need to process massive amounts of data for the purposes of natural-language search. Since 2010 it is a top-level Apache project. Facebook elected to implement its new messaging platform using HBase in November 2010, but migrated away from HBase in 2018. [4]
To prevent data loss, DynamoDB features a two-tier backup system of replication and long-term storage. [30] Each partition features three nodes, each of which contains a copy of that partition's data. Each node also contains two data structures: a B tree used to locate items, and a replication log that notes all changes made to the node.
The Simple Cloud API is a common API for accessing cloud application services offered by multiple vendors. The following services are supported: Storage with adapters for services such as Amazon S3 and Nirvanix [6] Document with adapters for services such as Azure Table Storage and Amazon SimpleDB [7]
[6] [7] NoSQL databases are increasingly used in big data and real-time web applications. [8] Motivations for this approach include simplicity of design, simpler "horizontal" scaling to clusters of machines (which is a problem for relational databases), [5] finer control over availability, and limiting the object-relational impedance mismatch. [9]
For example, a near-real-time display depicts an event or situation as it existed at the current time minus the processing time, as nearly the time of the live event. [ 12 ] The distinction between the terms "near real time" and "real time" is somewhat nebulous and must be defined for the situation at hand.
Amazon S3 Glacier is an online file storage web service that provides storage for data archiving and backup. [2]Glacier is part of the Amazon Web Services suite of cloud computing services, and is designed for long-term storage of data that is infrequently accessed and for which retrieval latency times of 3 to 5 hours are acceptable.