file_instances table lists
all the files seen by the Performance Schema when executing
file I/O instrumentation. If a file on disk has never been
opened, it will not be in
file_instances. When a file is
deleted from the disk, it is also removed from the
file_instances table has
The file name.
The instrument name associated with the file.
The count of open handles on the file. If a file was opened and then closed, it was opened 1 time, but
OPEN_COUNTwill be 0. To list all the files currently opened by the server, use
WHERE OPEN_COUNT > 0.