If a cluster is in low performance or cannot work properly, you may need to restart it for restoration. After modifying a cluster's configurations, such as security settings and parameters in the parameter group, manually restart the cluster to make the configurations take effect.
If the cluster is processing service data, such as importing data, querying data, creating snapshots, or restoring snapshots, cluster restarting will cause file damage or restart failure. You are advised to stop all cluster tasks before restarting the cluster.
View the Session Count and Active SQL Count metrics to check whether the cluster has active events. For details, see section Monitoring a Cluster.
Task Information changes to Restarting. When Cluster Status changes to Available again, the cluster is successfully restarted.