ndbinfo: The NDB Cluster Information Database parent_fq_name  is the fully qualified name of this object’s parent object (table). table_id  is the table’s internal ID generated by  NDB . This is the same internal table ID shown in other ndbinfo  tables; it is also visible in the output of  ndb_show_tables . The  type  column shows the type of table. This is always one of  System table ,  User table ,  Unique hash index ,  Hash index ,  Unique ordered index ,  Ordered index ,  Hash index trigger , Subscription trigger ,  Read only constraint ,  Index trigger ,  Reorganize trigger , Tablespace ,  Log file group ,  Data file ,  Undo file ,  Hash map ,  Foreign key definition , Foreign key parent trigger ,  Foreign key child trigger , or  Schema transaction . The values shown in all of the columns  ex_req ,  ex_req_imm_ok ,  ex_wait_ok ,  ex_wait_fail , sh_req ,  sh_req_imm_ok ,  sh_wait_ok , and  sh_wait_fail  represent cumulative numbers of requests since the table or fragment was created, or since the last restart of this node, whichever of these occurred later. This is also true for the time values shown in the  wait_ok_millis  and  wait_fail_millis columns. Every lock request is considered either to be in progress, or to have completed in some way (that is, to have succeeded or failed). This means that the following relationships are true: The number of requests currently in progress is the current number of incomplete requests, which can be found as shown here: A failed wait indicates an aborted transaction, but the abort may or may not be caused by a lock wait timeout. You can obtain the total number of aborts while waiting for locks as shown here: The  logbuffer  table provides information on NDB Cluster log buffer usage. The  logbuffers  table contains the following columns: The ID of this data node. Type of log. One of:  REDO ,  DD-UNDO ,  BACKUP-DATA , or  BACKUP-LOG . The log ID; for Disk Data undo log files, this is the same as the value shown in the LOGFILE_GROUP_NUMBER  column of the  INFORMATION_SCHEMA.FILES  tableas well as the value shown for the  log_id  column of the  ndbinfo logspaces  table 4559 • log_part • log_id • log_type • node_id [aborts while waiting for locks] = ex_wait_fail + sh_wait_fail 23.5.14.33 The ndbinfo logbuffers Table ex_req >= (ex_req_imm_ok + ex_wait_ok + ex_wait_fail) sh_req >= (sh_req_imm_ok + sh_wait_ok + sh_wait_fail) [exclusive lock requests in progress] = ex_req - (ex_req_imm_ok + ex_wait_ok + ex_wait_fail) [shared lock requests in progress] = sh_req - (sh_req_imm_ok + sh_wait_ok + sh_wait_fail)