2026-03-12 20:23:15

tpt/evh.sql

@@ -0,0 +1,27 @@
+-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
+-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
+
+-- EST_TIME_S column is a rough ESTIMATE of total wait time consumed by waits in a latency bucket
+-- it assumes random distribution of event latencies between adjacent buckets which may not be the
+-- case in reality
+
+COL evh_event HEAD WAIT_EVENT
+COL evh_est_time HEAD "EST_TIME_S*"
+COL wait_count_graph FOR A22
+COL evh_wait_time_milli HEAD WAIT_TIME_MILLI FOR A15 JUST RIGHT
+BREAK ON evh_event SKIP 1
+
+SELECT
+    event             evh_event 
+  , LPAD('< ' ||wait_time_milli, 15)  evh_wait_time_milli
+  , wait_count 
+  , CASE WHEN wait_count = 0 THEN NULL ELSE ROUND(wait_time_milli * wait_count * CASE WHEN wait_time_milli = 1 THEN 0.5 ELSE 0.75 END / 1000, 3) END evh_est_time
+  , last_update_time   -- 11g
+fROM
+    v$event_histogram
+WHERE
+    regexp_like(event, '&1', 'i')
+ORDER BY
+    event
+  , wait_time_milli
+/