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/*
*
*  Author  : Vishal Gupta
*  Purpose : Display Buffer Hit Ratio from AWR data
*
*  Revision History:
*  ===================
*  Date       Author        Description
*  ---------  ------------  -----------------------------------------
*  05-Aug-06  Vishal Gupta  First Draft
*  15-May-07  Vishal Gupta  Formatted the output
*/

set pages 10000

COLUMN mydate HEADING 'YYYY-MM-DD HH24'
COLUMN bhr    HEADING 'Buffer Hit|Ratio (%)' FORMAT 999

select 
   to_char(sn.END_INTERVAL_TIME,'yyyy-mm-dd HH24') mydate,
   new.name buffer_pool_name,
  (((new.consistent_gets-old.consistent_gets)+(new.db_block_gets-old.db_block_gets))-(new.physical_reads-old.physical_reads)) 
   /((new.consistent_gets-old.consistent_gets)+(new.db_block_gets-old.db_block_gets))*100 bhr
from DBA_HIST_buffer_pool_stat old,
     DBA_HIST_buffer_pool_stat new,
     DBA_HIST_snapshot sn
where sn.dbid = (select dbid from v$database)
  AND sn.dbid = new.dbid
  AND sn.instance_number = new.instance_number
  AND new.dbid = old.dbid
  AND new.instance_number = old.instance_number
  and new.name = old.name
  and new.snap_id = sn.snap_id
  AND old.snap_id = sn.snap_id-1
  and sn.END_INTERVAL_TIME > sysdate - &&1
order by 1 asc
/


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