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With its distributed, shared-nothing architecture, MySQL Cluster has been carefully designed to deliver 99.999% availability ensuring resilience to failures and the ability to perform scheduled maintenance without downtime.
Protecting against outages:
Figure 1: With no single point of failure, MySQL Cluster delivers extreme resilience to failures.
MySQL Cluster also protects against the estimated 30% of downtime resulting from scheduled maintenance activities by allowing on-line operations, including: