DESC sys.user_summary_by_file_io;
Field	Type	Null	Key	Default	Extra
user	varchar(32)	YES		NULL
ios	decimal(42,0)	YES		NULL
io_latency	text	YES		NULL
SELECT * FROM sys.user_summary_by_file_io;
DESC sys.x$user_summary_by_file_io;
Field	Type	Null	Key	Default	Extra
user	varchar(32)	YES		NULL
ios	decimal(42,0)	YES		NULL
io_latency	decimal(42,0)	YES		NULL
SELECT * FROM sys.x$user_summary_by_file_io;
