2026-03-12 20:23:15

vg/awr_buffer_hit_ratio_trend.sql

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+@@header
+
+/*
+*
+*  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
+/
+
+
+@@footer