Databases – Fault Tolerance

Fault Tolerance

Fault tolerance is the property that enables a system to continue its intended operation, possibly at a reduced level, rather than failing completely, when some portion of the system fails.

A database is fault-tolerant when it can access a secondary shard when the primary is unavailable.

This is achieved through:

  • Database Replication
  • Fault Detection & Failover

A database that maintains multiple copies of all data in different physical nodes located across independent physical sub-systems, such as server racks and network routers, has a higher probability to continue operating when the primary copy of the data is unavailable due to its ability to read data from multiple replications.

In large-scale distribution systems, it becomes increasingly important to have reliable failure detection systems that can identify failing storage drives and provide failover units in order to maximise service uptime.

This article needs improvement. You can help improve this article. You can also write similar articles and help the community.