# Heartbeat Parameters

When the active server heartbeat stops, the standby server waits for its activation interval (elapsed time since it detected the most recent heartbeat); then the standby server retrieves information from shared storage and assumes the role of active server.

The default heartbeat interval is 3 seconds, and the default activation interval is 10 seconds. The activation interval must be at least twice the heartbeat interval. Both intervals are specified in seconds. You can set these intervals in the server configuration files. See Fault Tolerance Parameters for details.

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