ndbinfo: The NDB Cluster Information Database Upper bound Page read latency (ms) Page write latency (ms) Log wait latency (ms) Latency of  get_page()  calls (ms) The read latency ( page_reads  column) measures the time from when the read request is sent to the file system thread until the read is complete and has been reported back to the execution thread. The write latency ( page_writes ) is calculated in a similar fashion. The size of the page read to or written from a Disk Data tablespace is always 32 KB. Log wait latency ( log_waits  column) is the length of time a page write must wait for the undo log to be flushed, which must be done prior to each page write. The  pgman_time_track_stats  table was added in NDB 8.0.19. This table contains information about NDB Cluster node processes; each node is represented by the row in the table. Only nodes that are connected to the cluster are shown in this table. You can obtain information about nodes that are configured but not connected to the cluster from the  nodes  and  config_nodes tables. The  processes  table contains the following columns: The node’s unique node ID in the cluster Type of node (management, data, or API node; see text) Version of the  NDB  software program running on this node. This node’s process ID Process ID of this node’s angel process 4572 • angel_process_id • process_id • node_version • node_type • node_id 23.5.14.41 The ndbinfo processes Table Notes • get_page • log_waits • page_writes • page_reads