ndbinfo: The NDB Cluster Information Database +-----------------------------+ | Data Memory Used, All Nodes | +-----------------------------+ | 6460 | +-----------------------------+ 1 row in set (0.37 sec) mysql>  SELECT SUM(max) as ’Total IndexMemory Available’ > FROM memoryusage > WHERE memory_type = ’Index memory’; +-----------------------------+ | Total IndexMemory Available | +-----------------------------+ | 25664 | +-----------------------------+ 1 row in set (0.33 sec) mysql>  SELECT * FROM nodes; +---------+--------+---------+-------------+ | node_id | uptime | status | start_phase | +---------+--------+---------+-------------+ | 1 | 13602 | STARTED | 0 | | 2 | 16 | STARTED | 0 | +---------+--------+---------+-------------+ 2 rows in set (0.04 sec) mysql>  SELECT * FROM Nodes; ERROR 1146 (42S02): Table ’ndbinfo.Nodes’ doesn’t exist 4524 • arb_connected • arb_ticket • arbitrator • node_id ndbinfo  table and column names are case-sensitive (as is the name of the  ndbinfo  database itself). These identifiers are in lowercase. Trying to use the wrong lettercase results in an error, as shown in this example: mysqldump  ignores the  ndbinfo  database entirely, and excludes it from any output. This is true even when using the  --databases  or  --all-databases  option. NDB Cluster also maintains tables in the  INFORMATION_SCHEMA  information database, including the FILES  table which contains information about files used for NDB Cluster Disk Data storage, and the ndb_transid_mysql_connection_map  table, which shows the relationships between transactions, transaction coordinators, and NDB Cluster API nodes. For more information, see the descriptions of the tables or Section 23.5.15, “INFORMATION_SCHEMA Tables for NDB Cluster” . The  arbitrator_validity_detail  table shows the view that each data node in the cluster has of the arbitrator. It is a subset of the  membership  table. The  arbitrator_validity_detail  table contains the following columns: This node’s node ID Node ID of arbitrator Internal identifier used to track arbitration 23.5.14.1 The ndbinfo arbitrator_validity_detail Table