Script: user_hit_ratio.sql

-- -----------------------------------------------------------------------------------
-- File Name    : https://oracle-base.com/dba/monitoring/user_hit_ratio.sql
-- Author       : Tim Hall
-- Description  : Displays the Cache Hit Ratio per user.
-- Requirements : Access to the V$ views.
-- Call Syntax  : @user_hit_ratio
-- Last Modified: 15/07/2000
-- -----------------------------------------------------------------------------------
SET LINESIZE 500
COLUMN "Hit Ratio %" FORMAT 999.99

SELECT a.username "Username",
       b.consistent_gets "Consistent Gets",
       b.block_gets "DB Block Gets",
       b.physical_reads "Physical Reads",
       Round(100* (b.consistent_gets + b.block_gets - b.physical_reads) /
       (b.consistent_gets + b.block_gets),2) "Hit Ratio %"
FROM   v$session a,
       v$sess_io b
WHERE  a.sid = b.sid
AND    (b.consistent_gets + b.block_gets) > 0
AND    a.username IS NOT NULL;