2026-03-12 20:23:15

vg/dictionary_cache_effectiveness.sql

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+SET ECHO off 
+REM NAME:   TFSDCEFF.SQL 
+REM USAGE:"@path/tfsdceff" 
+REM ------------------------------------------------------------------------ 
+REM REQUIREMENTS: 
+REM    Should be run as SYS 
+REM ------------------------------------------------------------------------ 
+REM PURPOSE: 
+REM    Reports dictionary cache parameter effectiveness.  It recommends 
+REM    an action based on maintaining more than 80% usage ofthe available 
+REM    cache entries while encountering cache misses no more than 10% of 
+REM    the time. 
+REM  
+REM ------------------------------------------------------------------------ 
+REM Main text of script follows: 
+ 
+ttitle - 
+  center 'Dictionary Cache Statistics Report'  skip 2 
+ 
+col parameter heading 'Parameter Name'    format a20       justify c trunc 
+col count     heading 'Entries|Allocated' format 9999990   justify c 
+col usage     heading 'Entries|Used'      format 9999990   justify c 
+col gets heading 'Gets'              format 9999990   justify c 
+col getmisses heading 'Get|Misses'        format 9999990   justify c 
+col pctused   heading 'Pct|Used'       format     990.0 justify c 
+col pctmisses heading 'Pct|Misses'        format     990.0 justify c 
+col action    heading 'Rec''d|Action'     format a6  justify c 
+ 
+select 
+  parameter, 
+  count, 
+  usage, 
+  100*nvl(usage,0)/decode(count,null,1,0,1,count) pctused, 
+  gets, 
+  getmisses, 
+  100*nvl(getmisses,0)/decode(gets,null,1,0,1,gets) pctmisses, 
+  decode( 
+    greatest(100*nvl(usage,0)/decode(count,null,1,0,1,count),80), 
+    80, ' Lower', 
+    decode(least(100*nvl(getmisses,0)/decode(gets,null,1,0,1,gets),10), 
+    10, '*Raise', ' Ok') 
+  ) action 
+from 
+  v$rowcache 
+order by 
+  1 
+/ 
+ 
+prompt 
+prompt 
+prompt Rec'd Action is based on maintaining >80% Entries Used and <10% Gets Missed. 
+