2026-03-12 20:23:15

timhall/monitoring/latch_hit_ratios.sql

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+-- -----------------------------------------------------------------------------------
+-- File Name    : https://oracle-base.com/dba/monitoring/latch_hit_ratios.sql
+-- Author       : Tim Hall
+-- Description  : Displays current latch hit ratios.
+-- Requirements : Access to the V$ views.
+-- Call Syntax  : @latch_hit_ratios
+-- Last Modified: 15-JUL-2000
+-- -----------------------------------------------------------------------------------
+SET LINESIZE 200
+
+COLUMN latch_hit_ratio FORMAT 990.00
+ 
+SELECT l.name,
+       l.gets,
+       l.misses,
+       ((1 - (l.misses / l.gets)) * 100) AS latch_hit_ratio
+FROM   v$latch l
+WHERE  l.gets   != 0
+UNION
+SELECT l.name,
+       l.gets,
+       l.misses,
+       100 AS latch_hit_ratio
+FROM   v$latch l
+WHERE  l.gets   = 0
+ORDER BY 4 DESC;