NDB Cluster Configuration Files value. 0 is the default, and means no logging is performed; 1 enables trace logging, and 2 enables logging of additional  DBDICT  debugging output. You can cause threads to be killed immediately whenever watchdog issues occur by enabling the WatchdogImmediateKill  data node configuration parameter. This parameter should be used only when debugging or troubleshooting, to obtain trace files reporting exactly what was occurring the instant that execution ceased. Backup parameters.   The  [ndbd]  parameters discussed in this section define memory buffers set aside for execution of online backups. In creating a backup, there are two buffers used for sending data to the disk. The backup data buffer is used to fill in data recorded by scanning a node’s tables. Once this buffer has been filled to the level specified as  BackupWriteSize , the pages are sent to disk. While flushing data to disk, the backup process can continue filling this buffer until it runs out of space. When this happens, the backup process pauses the scan and waits until some disk writes have completed freeing up memory so that scanning may continue. The default value for this parameter is 16MB. The minimum is 512K. During normal operation, data nodes attempt to maximize the disk write speed used for local checkpoints and backups while remaining within the bounds set by  MinDiskWriteSpeed  and MaxDiskWriteSpeed . Disk write throttling gives each LDM thread an equal share of the total budget. This allows parallel LCPs to take place without exceeding the disk I/O budget. Because a backup is executed by only one LDM thread, this effectively caused a budget cut, resulting in longer backup 4120 Version (or later) NDB 8.0.13 Type or units boolean Default false Range true, false Restart Type N (NDB 8.0.13) Version (or later) NDB 8.0.13 Type or units bytes Default 16M Range 512K - 4294967039 (0xFFFFFEFF) Deprecated Yes (in NDB 7.6) Restart Type N (NDB 8.0.13) Version (or later) NDB 8.0.13 Type or units percent Default 50 Range 0 - 90 Restart Type N (NDB 8.0.13) • WatchdogImmediateKill • BackupDataBufferSize • BackupDiskWriteSpeedPct