MySQL :: MySQL 8.4 Reference Manual :: 29.12.3.2 The file_instances Table (original) (raw)

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29.12.3.2 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 is not shown infile_instances. When a file is deleted from the disk, it is also removed from thefile_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, butOPEN_COUNT is 0. To list all the files currently opened by the server, use WHERE 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.