MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
These views summarize file I/O activity, grouped by file and thread. By default, rows are sorted with most recent I/O first.
The latest_file_io and
x$latest_file_io views have
these columns:
thread
For foreground threads, the account associated with the thread (and port number for TCP/IP connections). For background threads, the thread name and thread ID
file
The file path name.
latency
The wait time of the file I/O event.
operation
The type of operation.
requested
The number of data bytes requested for the file I/O event.