A description for this Performance-schema Table has not yet been added to this Documentation.
CREATE TABLE `file_instances` ( `FILE_NAME` varchar(512) NOT NULL COMMENT 'File name.', `EVENT_NAME` varchar(128) NOT NULL COMMENT 'Instrument name associated with the file.', `OPEN_COUNT` int(10) unsigned NOT NULL COMMENT 'Open handles on the file. A value of greater than zero means that the file is currently open.' )
Additional information on this topic may be found in the MariaDB Public Knowledge Base.
Information specific to MariaDB SkySQL can be found on the file_instances page in the SkySQL Documentation.