DESC sys.latest_file_io;
Field	Type	Null	Key	Default	Extra
thread	varchar(316)	YES		NULL	
file	varchar(512)	YES		NULL	
latency	text	YES		NULL	
operation	varchar(32)	NO		NULL	
requested	text	YES		NULL	
SELECT * FROM sys.latest_file_io;
DESC sys.x$latest_file_io;
Field	Type	Null	Key	Default	Extra
thread	varchar(316)	YES		NULL	
file	varchar(512)	YES		NULL	
latency	bigint(20) unsigned	YES		NULL	
operation	varchar(32)	NO		NULL	
requested	bigint(20)	YES		NULL	
SELECT * FROM sys.x$latest_file_io;