Oracle Latch Hit Ratios Report
This script displays current latch hit ratios in the Oracle database. It queries the V$LATCH view to show latch gets, misses, and calculated hit ratios, helping DBAs analyze latch contention and diagnose concurrency-related performance issues.
oraclesqlperformance-tuningv1.0.0
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By OracleDba • Created
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-- -----------------------------------------------------------------------------------
-- File Name : https://oracle-base.com/dba/monitoring/latch_hit_ratios.sql
-- Author : Tim Hall
-- Description : Displays current latch hit ratios.
-- Requirements : Access to the V$ 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;