missing x$kcbrbh in 8.1.6

hello,

regarding the discussion about increasing/decreasing buffers , Niemiec's book (and some papers) recommend querying x$kcbrbh and x$kcbcbh

If I query them I get "table or view does not exist" on the 8.1.6 instance , but I can query them in the 8.0.5 instance. Also the related parameter DB_BLOCK_LRU_STATISTICS seems to be obsolete since 8.1.3

So, my question is - how do I get this information in 8.1.6?

thanx,

    Marin

"The important thing for all of us is never look *at* the bars, look *through* them. Because if you keep looking *at* bars, you'll never get anything done, and you'll never have fun in life, any joy."

                                                  William Wharton, "Pride"