David Fitzjarrell wants to see which indexes are in use:
Database performance is one of the biggest areas for DBAs to address, measured primarily in time. Users usually complain when queries “take too long” and immediately run to the DBA team to register their disappointment. One avenue used to address such concerns is the creation and maintenance of indexes, and as any DBA with any experience can attest, simply throwing indexes at a table isn’t necessarily the smartest play; a major concern is if the index is actually being utilized. Oracle, in its wisdom, has provided tools to monitor these objects in the form of system views. Let’s look at what is available and how to get the most benefit out of them.
Click through for some scripts and information on how to tell whether an index is in use or not.