2026-03-12 20:23:15

idev/perf_redo_log_contention.sql

@@ -0,0 +1,68 @@
+-- +----------------------------------------------------------------------------+
+-- |                          Jeffrey M. Hunter                                 |
+-- |                      jhunter@idevelopment.info                             |
+-- |                         www.idevelopment.info                              |
+-- |----------------------------------------------------------------------------|
+-- |      Copyright (c) 1998-2011 Jeffrey M. Hunter. All rights reserved.       |
+-- |----------------------------------------------------------------------------|
+-- | DATABASE : Oracle                                                          |
+-- | FILE     : perf_redo_log_contention.sql                                    |
+-- | CLASS    : Tuning                                                          |
+-- | PURPOSE  : Report on overall redo log contention for the instance since    |
+-- |            the instance was last started.                                  |
+-- | NOTE     : As with any code, ensure to test this script in a development   |
+-- |            environment before attempting to run it in production.          |
+-- +----------------------------------------------------------------------------+
+
+SET LINESIZE 145
+SET PAGESIZE 9999
+SET VERIFY   off
+
+prompt
+prompt =======================================
+prompt Latches
+prompt =======================================
+prompt 
+
+COLUMN name             FORMAT a30           HEADING 'Latch Name'
+COLUMN gets             FORMAT 999,999,999   HEADING 'Gets'
+COLUMN misses           FORMAT 999,999,999   HEADING 'Misses'
+COLUMN sleeps           FORMAT 999,999,999   HEADING 'Sleeps'
+COLUMN immediate_gets   FORMAT 999,999,999   HEADING 'Immediate Gets'
+COLUMN immediate_misses FORMAT 999,999,999   HEADING 'Immediate Misses'
+
+BREAK ON report
+COMPUTE SUM OF gets             ON report
+COMPUTE SUM OF misses           ON report
+COMPUTE SUM OF sleeps           ON report
+COMPUTE SUM OF immediate_gets   ON report
+COMPUTE SUM OF immediate_misses ON report
+
+SELECT 
+    INITCAP(name) name
+  , gets
+  , misses
+  , sleeps
+  , immediate_gets
+  , immediate_misses
+FROM  sys.v_$latch
+WHERE name LIKE 'redo%'
+ORDER BY 1;
+
+
+prompt
+prompt =======================================
+prompt System Statistics
+prompt =======================================
+prompt
+
+COLUMN name    FORMAT a30               HEADING 'Statistics Name'
+COLUMN value   FORMAT 999,999,999,999   HEADING 'Value'
+
+SELECT
+    name
+  , value
+FROM
+    v$sysstat
+WHERE
+    name LIKE 'redo%';