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Kiran Kumar Kolli

Hari Sudan Sundar

Dharma Kiritkumar Shukla

Karthik Raman

Momin Mahmoud Al-Ghosien

Ji Huang

Shireesh Kumar Thota

Arsalan Ahmad

Pankaj Sharma

Madhan Gajendran

Ankur Jauhari

Sujit Vattathil Kuruvilla

Liang Li

Yogesh Kumar

Per Mikael Horal

Adam Thomas Bishop

Muthukumaran Arumugam

Brikesh Kumar

Mohammad Derakhshani

Denis Rystsov

Swarnim Vyas

A database management system for managing a database includes each document being stored as a number of replicas for accessibility and data preservation. The system includes: a processor; a network interface; and a memory comprising programming instructions for execution by the processor to implement a database management service, the service configured to maintain a primary replica of a document, a number of secondary replicas of the document, and another log-only replica storing a log of changes to the document rather than contents of the document. The service makes head reads to the primary replica as needed when a read request to the number of secondary replicas does not result in a quorum.

Document database system using replicas of a stored document

Data services are often provided with consistency guarantees of either strong consistency models, comprising uniform wall-clock consistency, or eventual consistency models, where temporary logical inconsistency is guaranteed to be resolved only after full data propagation. However, the performance characteristics of contemporary services often require an intermediate consistency model, where some aspects of the service have specific consistency expectations and other aspects of the service are flexible, such as bounded staleness (e.g., a maximum delay in reaching consistency); session consistency (e.g., individual sessions remain logically consistent, but ordering may vary across sessions); and prefix consistency (e.g., each view during a session is logically consistent, but ordering may vary between session views). Service guarantees may involve a selection within a range of consistency models that includes one or more intermediate consistency levels, and server configurations may be selected and applied to fulfill the intermediate consistency level selected in the service level agreement.

Intermediate consistency levels for database configuration

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Kiran Kumar Kolli