ORA-00600: internal error code, arguments: [19004], [], [], [], [], [], [], []

Of course, you know the 00600 fateful error has  tons of posible  faces. And of course, you know, 9 dba colleagues out of 10 will urge you to the famous Metalink. I won't debate here about Metalink, i've never made a single SR. Just downloaded some updates or patches. One of the 000600 erros, the one having 19004 as argument can be easely overcome like this:

begin 
dbms_stats.DELETE_SCHEMA_STATS('username');
end;

Too easy? Sometimes, time is more than money.