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MySQL 5.7 Reference Manual
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25.12.3.2 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, use WHERE OPEN_COUNT > 0.

TRUNCATE TABLE is not permitted for the file_instances table.


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