DESC sys.user_summary_by_file_io_type;
Field	Type	Null	Key	Default	Extra
user	varchar(128)	YES		NULL	
event_name	varchar(128)	NO		NULL	
total	bigint(20) unsigned	NO		NULL	
latency	text	YES		NULL	
max_latency	text	YES		NULL	
SELECT * FROM sys.user_summary_by_file_io_type;
DESC sys.x$user_summary_by_file_io_type;
Field	Type	Null	Key	Default	Extra
user	varchar(128)	YES		NULL	
event_name	varchar(128)	NO		NULL	
total	bigint(20) unsigned	NO		NULL	
latency	bigint(20) unsigned	NO		NULL	
max_latency	bigint(20) unsigned	NO		NULL	
SELECT * FROM sys.x$user_summary_by_file_io_type;