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• START BACKUP  is used to perform an online backup in the ndb_mgm  client; the ABORT BACKUP command is used to cancel a backup already in progress. For more information, see Section 23.5.8, “Online Backup of NDB Cluster” . 

•The CLUSTERLOG  command is used to perform various logging functions. See Section 23.5.3, “Event Reports Generated in NDB Cluster” , for more information and examples. NODELOG DEBUG  activates or deactivates debug printouts in node logs, as described previously in this section. 

•For testing and diagnostics work, the client supports a DUMP  command which can be used to execute internal commands on the cluster. It should never be used in a production setting unless directed to do so by MySQL Support. For more information, see MySQL NDB Cluster Internals Manual. 

## 23.5.2 NDB Cluster Log Messages 

This section contains information about the messages written to the cluster log in response to different cluster log events. It provides additional, more specific information on NDB  transporter errors. 

## 23.5.2.1 NDB Cluster: Messages in the Cluster Log 

The following table lists the most common NDB  cluster log messages. For information about the cluster log, log events, and event types, see Section 23.5.3, “Event Reports Generated in NDB Cluster” . These log messages also correspond to log event types in the MGM API; see The Ndb_logevent_type Type, for related information of interest to Cluster API developers. 

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