NDB Cluster Configuration Files All memory allocation for a data node is performed when the node is started. This ensures that the data node can run in a stable manner without using swap memory, so that  NDB  can be used for latency- sensitive (realtime) applications. The following types of memory are allocated on data node startup: 23.3.3.13 Data Node Memory Management •Data memory •Shared global memory •Redo log buffers •Job buffers •Send buffers •Page cache for disk data records •Schema transaction memory •Transaction memory •Undo log buffer •Query memory •Block objects •Schema memory •Block data structures •Long signal memory •Shared memory communication buffers •Data Memory ( DataMemory ) •Redo log buffers ( RedoBuffer ) •Job buffers The  NDB  memory manager, which regulates most data node memory, handles the following memory resources: 4232 Symbol Restart Type Description a Rolling Restart of an NDB Cluster” ) S System All cluster nodes must be shut down completely, then restarted, to effect a change in this parameter I Initial Data nodes must be restarted using the  --initial  option •Send buffers ( SendBufferMemory ,  TotalSendBufferMemory ,  ExtraSendBufferMemory , ReservedSendBufferMemory )