DESC sys.wait_classes_global_by_latency;
Field	Type	Null	Key	Default	Extra
event_class	varchar(128)	YES		NULL	
total	decimal(42,0)	YES		NULL	
total_latency	varchar(11)	YES		NULL	
min_latency	varchar(11)	YES		NULL	
avg_latency	varchar(11)	YES		NULL	
max_latency	varchar(11)	YES		NULL	
SELECT * FROM sys.wait_classes_global_by_latency;
DESC sys.x$wait_classes_global_by_latency;
Field	Type	Null	Key	Default	Extra
event_class	varchar(128)	YES		NULL	
total	decimal(42,0)	YES		NULL	
total_latency	decimal(42,0)	YES		NULL	
min_latency	bigint unsigned	YES		NULL	
avg_latency	decimal(46,4)	NO		0.0000	
max_latency	bigint unsigned	YES		NULL	
SELECT * FROM sys.x$wait_classes_global_by_latency;