ndbinfo: The NDB Cluster Information Database Note Both management nodes and API nodes are eligible to become arbitrators. Querying this table provides information similar to that provided by the  ALL REPORT MemoryUsage command in the  ndb_mgm  client, or logged by  ALL DUMP 1000 . The  memoryusage  table contains the following columns: The node ID of this data node. One of  Data memory ,  Index memory , or  Long message buffer . Number of bytes currently used for data memory or index memory by this data node. Number of pages currently used for data memory or index memory by this data node; see text. 23.5.14.36 The ndbinfo memoryusage Table Total number of bytes of data memory or index memory available for this data node; see text. Total number of memory pages available for data memory or index memory on this data node; see text. • node_id • memory_type • used • used_pages • total • total_pages Notes The  total  column represents the total amount of memory in bytes available for the given resource (data memory or index memory) on a particular data node. This number should be approximately equal to the setting of the corresponding configuration parameter in the  config.ini  file. Suppose that the cluster has 2 data nodes having node IDs  5  and  6 , and the  config.ini  file contains the following: Suppose also that the value of the  LongMessageBuffer  configuration parameter is allowed to assume its default (64 MB). The following query shows approximately the same values: [ndbd default] DataMemory = 1G IndexMemory = 1G mysql> SELECT node_id, memory_type, total > FROM ndbinfo.memoryusage; +---------+---------------------+------------+ | node_id | memory_type | total | +---------+---------------------+------------+ | 5 | Data memory | 1073741824 | | 5 | Index memory | 1074003968 | 4563