States of a Node

A node can be in any one of the following states:

• Starting: The node is starting.

• Waiting: The node cannot decide its start level and is offline. If a single node is in this state for more than two minutes, stop the node and then start it at the repair level; see Stopping a Node and Starting a Node Clearing a database.

• Running: The node is providing all services that are appropriate for its role.

• Stopping: The node is in the process of stopping.

• Stopped: The node is inactive. Repair of a stopped node is prohibited.

• Recovering: The node is being recovered. When a node fails, the mirror node takes over the functions of the failed node. The failed node tries to recover by using the data and log records in main memory or on disk. The failed node uses the log records from the mirror node to catch up with the transactions performed when it was down. If recovery is successful, the node becomes active. If recovery fails, the node state changes to repairing.

• Repairing: The node is being repaired. This operation reinitializes the node and copies the data and log records from the mirror node. Repair is more time consuming than recovery.