MySQL 5.6 Reference Manual Including MySQL NDB Cluster 7.3-7.4 Reference Guide
The 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 is not listed in
file_instances
. When a file is
deleted from the disk, it is also removed from the
file_instances
table.
The file_instances
table has
these columns:
FILE_NAME
The file name.
EVENT_NAME
The instrument name associated with the file.
OPEN_COUNT
The count of open handles on the file. If a file was
opened and then closed, it was opened 1 time, but
OPEN_COUNT
is 0. To list all the files
currently opened by the server, use WHERE
OPEN_COUNT > 0
.
TRUNCATE TABLE
is not permitted
for the file_instances
table.