V$BUFFER_POOL_STATISTICS definition in Oracle Database 11.2
V$BUFFER_POOL_STATISTICS

select
  id,                                      -- ID NUMBER
  name,                                    -- NAME VARCHAR2(20)
  block_size,                              -- BLOCK_SIZE NUMBER
  set_msize,                               -- SET_MSIZE NUMBER
  cnum_repl,                               -- CNUM_REPL NUMBER
  cnum_write,                              -- CNUM_WRITE NUMBER
  cnum_set,                                -- CNUM_SET NUMBER
  buf_got,                                 -- BUF_GOT NUMBER
  sum_write,                               -- SUM_WRITE NUMBER
  sum_scan,                                -- SUM_SCAN NUMBER
  free_buffer_wait,                        -- FREE_BUFFER_WAIT NUMBER
  write_complete_wait,                     -- WRITE_COMPLETE_WAIT NUMBER
  buffer_busy_wait,                        -- BUFFER_BUSY_WAIT NUMBER
  free_buffer_inspected,                   -- FREE_BUFFER_INSPECTED NUMBER
  dirty_buffers_inspected,                 -- DIRTY_BUFFERS_INSPECTED NUMBER
  db_block_change,                         -- DB_BLOCK_CHANGE NUMBER
  db_block_gets,                           -- DB_BLOCK_GETS NUMBER
  consistent_gets,                         -- CONSISTENT_GETS NUMBER
  physical_reads,                          -- PHYSICAL_READS NUMBER
  physical_writes                          -- PHYSICAL_WRITES NUMBER
from
  gv$buffer_pool_statistics
where
  inst_id = USERENV('Instance')

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