V$sess_io: meaning of the columns in this view

Hello all
I've RTM:
http://docs.oracle.com/cd/B19306_01/server.102/b14237/dynviews_2086.htm
However, I cannot seem to find a clear explanation of what each column is showing, so here is my guess:
BLOCK_GETS: Blocks read from (er.. not entirely sure, given the next two columns)
CONSISTENT_GETS: Blocks read from the buffer cache
PHYSICAL_READS: Blocks read from disk
BLOCK_CHANGES: Number of Blocks changed in total
CONSISTENT_CHANGES: Number of Blocks changed in the buffer cache
Also, when determining the IO for a particular session, is v$sess_io the most accurate view, or is there another that's updated more often and/or more accurately?
Thanks
bt

when you are instered in I/O's and the top events are I/O's related you would want to look at infamous sql's producing significant i/o's on your system specifically for the problematic sessions usually in waiting state.....
SELECT sql_id, COUNT(*) FROM v$active_session_history ash, v$event_name evt
WHERE ash.sample_time > SYSDATE - 1/24
AND ash.session_state = 'WAITING'
AND ash.event_id = evt.event_id
AND evt.wait_class = 'User I/O'
GROUP BY sql_id
ORDER BY COUNT(*) DESC;
Regards
Karan

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