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26.12.3.2 The file_instances Table
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 will not be 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
will be 0. To list all the files currently opened by the server, useWHERE OPEN_COUNT > 0
.
The file_instances
table has
these indexes:
Primary key on (
FILE_NAME
)Index on (
EVENT_NAME
)
TRUNCATE TABLE
is not permitted
for the file_instances
table.
Document created the 26/06/2006, last modified the 26/10/2018
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