Critical Node

A critical node is a node whose failure would cause the database to become unsafe and force a shutdown. Nodes can become critical for the following reasons:

  • A node has the only copy of a particular projection.
  • Fewer than half of your nodes are active. In an Eon Mode database, at least half of your primary nodes must be up to maintain data integrity.

The V_MONITOR.CRITICAL_NODES system table lists the critical nodes, if any, in your cluster.

For more information, see K-Safety in an Enterprise Mode Database for Enterprise Mode databases, and Data Integrity and High Availability in an Eon Mode Database for Eon Mode databases.