Overview of NDB Cluster Configuration Parameters, Options, and Variables • CrashOnCorruptedTuple : When enabled, forces node to shut down whenever it detects corrupted tuple. • DataDir : Data directory for this node. • DataMemory : Number of bytes on each data node allocated for storing data; subject to available system RAM and size of IndexMemory. • DefaultHashMapSize : Set size (in buckets) to use for table hash maps. Three values are supported: 0, 240, and 3840.. • DictTrace : Enable DBDICT debugging; for NDB development. • DiskDataUsingSameDisk : Set to false if Disk Data tablespaces are located on separate physical disks. • DiskIOThreadPool : Number of unbound threads for file access, applies to disk data only. • Diskless : Run without using disk. • DiskPageBufferEntries : Memory to allocate in DiskPageBufferMemory; very large disk transactions may require increasing this value. • DiskPageBufferMemory : Number of bytes on each data node allocated for disk page buffer cache. • DiskSyncSize : Amount of data written to file before synch is forced. • EnablePartialLcp : Enable partial LCP (true); if this is disabled (false), all LCPs write full checkpoints. • EnableRedoControl : Enable adaptive checkpointing speed for controlling redo log usage. • EventLogBufferSize : Size of circular buffer for NDB log events within data nodes. • ExecuteOnComputer : String referencing earlier defined COMPUTER. • ExtraSendBufferMemory : Memory to use for send buffers in addition to any allocated by TotalSendBufferMemory or SendBufferMemory. Default (0) allows up to 16MB. • FileSystemPath : Path to directory where data node stores its data (directory must exist). • FileSystemPathDataFiles : Path to directory where data node stores its Disk Data files. Default value is FilesystemPathDD, if set; otherwise, FilesystemPath is used if it is set; otherwise, value of DataDir is used. • FileSystemPathDD : Path to directory where data node stores its Disk Data and undo files. Default value is FileSystemPath, if set; otherwise, value of DataDir is used. • FileSystemPathUndoFiles : Path to directory where data node stores its undo files for Disk Data. Default value is FilesystemPathDD, if set; otherwise, FilesystemPath is used if it is set; otherwise, value of DataDir is used. • FragmentLogFileSize : Size of each redo log file. • HeartbeatIntervalDbApi : Time between API node-data node heartbeats. (API connection closed after 3 missed heartbeats). • HeartbeatIntervalDbDb : Time between data node-to-data node heartbeats; data node considered dead after 3 missed heartbeats. 4033