Distributed Databases Questions
Data replication in a distributed database refers to the process of creating and maintaining multiple copies of data across different nodes or sites within the database system. This is done to improve data availability, fault tolerance, and performance. Each copy of the data is stored on a separate node, allowing for local access and reducing the need for data transfer across the network.
Consistency in a distributed database refers to the property that ensures all copies of replicated data are kept in sync and reflect the same value at any given time. It ensures that updates or modifications made to the data are propagated to all copies in a coordinated manner, maintaining data integrity and avoiding conflicts or inconsistencies. Various techniques such as two-phase commit protocols, quorum-based approaches, or consensus algorithms are used to achieve consistency in distributed databases.