We've probably all heard about STATSPACK. The all mystical and power DBA telemetry suite for Oracle. I know that I myself have suggested to DBAs "don't worry, just run STATSPACK" to which I got an icy stare back.
STATSPACK is effectively made obsolete in 10g because so much of the data previously
kept by STATSPACK is now kept by the database itself. All the data is stored
in more V$ views and is intended to be viewed via the Enterprise Manager.
While graphs aren't as kool as piles of output, I'll take Enterprise Manager in this