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29.12.3.2 The file_instances Table

Thefile_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 shown infile_instances. When a file is deleted from the disk, it is also removed from thefile_instances table.

Thefile_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, butOPEN_COUNT is 0. To list all the files currently opened by the server, useWHERE OPEN_COUNT > 0.

Thefile_instances table has these indexes:

  • Primary key on (FILE_NAME)

  • Index on (EVENT_NAME)

TRUNCATE TABLE is not permitted for thefile_instances table.