Default 0 Range 0 - 4294967039 (0xFFFFFEFF) Added NDB 8.0.16 Deprecated NDB 8.0.19 Restart Type N (NDB 8.0.13) Dynamic buffer space (in bytes) for key and attribute data allocated to each data node. • TransactionMemory Version (or later) NDB 8.0.19 Type or units bytes Default 0 Range 0 - 16384G Added NDB 8.0.19 Restart Type N (NDB 8.0.13) This parameter determines the memory (in bytes) allocated for transactions on each data node. Setting of transaction memory can be handled in any one of the three ways listed here: Parameters incompatible with TransactionMemory.   The following parameters cannot be used concurrently with  TransactionMemory  and are deprecated as of NDB 8.0.19: Explicitly setting any of the parameters just listed when  TransactionMemory  has also been set in the cluster configuration file ( config.ini ) keeps the management node from starting. For more information regarding resource allocation in NDB Cluster data nodes, see Section 23.3.3.13, “Data Node Memory Management” . Scans and buffering.   There are additional  [ndbd]  parameters in the  Dblqh  module (in ndb/src/kernel/blocks/Dblqh/Dblqh.hpp ) that affect reads and updates. These include ZATTRINBUF_FILESIZE , set by default to 10000 × 128 bytes (1250KB) and  ZDATABUF_FILE_SIZE , set by default to 10000*16 bytes (roughly 156KB) of buffer space. To date, there have been neither any 4085 • MaxNoOfLocalScans • MaxNoOfLocalOperations • MaxNoOfFiredTriggers • MaxNoOfConcurrentIndexOperations •If neither any incompatible parameters are set nor  TransactionMemory  is set, transaction memory is set by  NDB  to 10% of the value of the  DataMemory  configuration parameter. •If  TransactionMemory  is set, this value is used for determining transaction memory. •A number of configuration parameters are incompatible with  TransactionMemory . If any of these are set, transaction memory is calculated as it was previous to NDB 8.0.19. You should be aware that it is not possible to set any of these parameters concurrently with  TransactionMemory ; if you attempt to do so, the management server is unable to start (see Parameters incompatible with TransactionMemory). NDB Cluster Configuration Files