39 lines
1.8 KiB
SQL
39 lines
1.8 KiB
SQL
-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
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-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
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-- this scripts uses "ASH math" by Graham Wood, Uri Shaft and John Beresniewicz for
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-- estimating the event counts (and average durations)
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COL evh_event HEAD WAIT_EVENT for A50 TRUNCATE
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COL evh_graph HEAD "Awesome|Graphic" JUST CENTER FOR A12
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COL pct_evt_time HEAD "% Event|Time"
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COL evh_est_total_ms HEAD "Estimated|Total ms"
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COL evh_millisec HEAD "Wait time|bucket ms+"
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COL evh_event HEAD "Wait Event"
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COL evh_sample_count HEAD "Num ASH|Samples"
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COL evh_est_event_count HEAD "Estimated|Total Waits"
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BREAK ON evh_event SKIP 1
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SELECT
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event evh_event
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, CASE WHEN time_waited = 0 THEN 0 ELSE TRUNC(POWER(2,TRUNC(LOG(2,time_waited/1000)))) END evh_millisec
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, COUNT(*) evh_sample_count
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, ROUND(SUM(CASE WHEN time_waited >= 1000000 THEN 1 WHEN time_waited = 0 THEN 0 ELSE 1000000 / time_waited END),1) evh_est_event_count
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, ROUND(CASE WHEN time_waited = 0 THEN 0 ELSE TRUNC(POWER(2,TRUNC(LOG(2,time_waited/1000)))) END * COUNT(*),1) evh_est_total_ms
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, ROUND ( 100 * RATIO_TO_REPORT( CASE WHEN time_waited = 0 THEN 0 ELSE TRUNC(POWER(2,TRUNC(LOG(2,time_waited/1000)))) END * COUNT(*) ) OVER (PARTITION BY event) , 1 ) pct_evt_time
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, '|'||RPAD(NVL(RPAD('#', ROUND (10 * RATIO_TO_REPORT( CASE WHEN time_waited = 0 THEN 0 ELSE TRUNC(POWER(2,TRUNC(LOG(2,time_waited/1000)))) END * COUNT(*) ) OVER (PARTITION BY event)), '#'),' '), 10)||'|' evh_graph
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FROM
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V$ACTIVE_SESSION_HISTORY
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--dba_hist_active_sess_history
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WHERE
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regexp_like(event, '&1')
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AND sample_time > SYSDATE - 1
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AND time_waited > 0 -- TODO
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GROUP BY
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event
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, CASE WHEN time_waited = 0 THEN 0 ELSE TRUNC(POWER(2,TRUNC(LOG(2,time_waited/1000)))) END -- evh_millisec
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ORDER BY 1, 2
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/
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