ndbinfo: The NDB Cluster Information Database Whether this node is connected to the arbitrator; either of  Yes  or  No Arbitration state The node ID is the same as that reported by  ndb_mgm -e "SHOW" . All nodes should show the same  arbitrator  and  arb_ticket  values as well as the same  arb_state value. Possible  arb_state  values are  ARBIT_NULL ,  ARBIT_INIT ,  ARBIT_FIND ,  ARBIT_PREP1 , ARBIT_PREP2 ,  ARBIT_START ,  ARBIT_RUN ,  ARBIT_CHOOSE ,  ARBIT_CRASH , and  UNKNOWN . arb_connected  shows whether the current node is connected to the  arbitrator . The  arbitrator_validity_summary  table provides a composite view of the arbitrator with regard to the cluster’s data nodes. The  arbitrator_validity_summary  table contains the following columns: Node ID of arbitrator Internal identifier used to track arbitration Whether this arbitrator is connected to the cluster Number of data nodes that see this node as arbitrator; either of  Yes  or  No In normal operations, this table should have only 1 row for any appreciable length of time. If it has more than 1 row for longer than a few moments, then either not all nodes are connected to the arbitrator, or all nodes are connected, but do not agree on the same arbitrator. The  arbitrator  column shows the arbitrator’s node ID. arb_ticket  is the internal identifier used by this arbitrator. arb_connected  shows whether this node is connected to the cluster as an arbitrator. This table provides a way to find the ID of the backup started most recently for this cluster. The  backup_id  table contains a single column  id , which corresponds to a backup ID taken using the ndb_mgm  client  START BACKUP  command. This table contains a single row. 4525 23.5.14.3 The ndbinfo backup_id Table Notes 23.5.14.2 The ndbinfo arbitrator_validity_summary Table Notes • arb_state • arbitrator • arb_ticket • arb_connected • consensus_count