Multimasterreplikaatio

Multimasterreplikaatio, also known as multi-master replication, is a database replication technique where multiple database servers can accept write operations. In a multimaster setup, any of the master servers can be updated, and these updates are then propagated to all other master servers in the replication group. This contrasts with master-slave replication, where only one master server can handle writes, and read operations can be distributed to slave servers.

The primary advantage of multimaster replication is its high availability and disaster recovery capabilities. If one master server fails, the remaining masters can continue to operate without interruption, ensuring continuous service. It also allows for geographically distributed databases, where users can connect to a local master for faster write performance.

However, multimaster replication introduces complexities, primarily around conflict resolution. When two or more masters accept conflicting updates to the same data simultaneously, a mechanism is needed to decide which update to keep. Various conflict resolution strategies exist, including last-writer-wins, first-writer-wins, or more complex application-defined logic. Implementing and managing these conflicts can be challenging and requires careful design.

Another consideration is the potential for increased network traffic due to the continuous synchronization of data between all masters. The overall complexity of managing a multimaster environment is generally higher than that of a master-slave setup, often requiring specialized expertise for deployment and maintenance. Despite these challenges, multimaster replication is a powerful solution for applications demanding high availability, scalability, and performance across multiple locations.