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-- 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.
-- @awr/awr_sqlstats_unstable.sql version 0.1 BETA by Tanel Poder
--
-- detect sql_id that use a varying amount of *elapsed time per execution* across different plan hash values
-- or across AWR time ranges
--
-- usage examples:
-- a) typical use - show SQL_IDs from last 2 weeks that have different plans with different
-- elapsed time per execution (per plan)
--
-- @awr/awr_sqlstats_unstable sql_id plan_hash_value sysdate-14 sysdate
--
-- b) special case use with SQL using literals (note that AWR may not persist many of these queries)
-- as due to literals these tend to be executed only once
--
-- @awr/awr_sqlstats_unstable force_matching_signature plan_hash_value sysdate-14 sysdate
--
-- c) advanced use - show cases where *the same plan* (same plan hash value) uses different amounts
-- of elapsed time per execution over time. so it's not a *plan* flipping problem
--
-- @awr/awr_sqlstats_unstable sql_id,plan_hash_value begin_interval_time sysdate-14 sysdate
--
-- Once you have found a SQL_ID of interest, you can drill down into its actual plans and elapsed times using:
--
-- @awr/awr_sqlstats_per_exec &sqlid % sysdate-14 sysdate
--
--
-- other:
-- Inspired by Kerry Osborne's unstable_plans.sql script - http://kerryosborne.oracle-guy.com/2008/10/unstable-plans/
--
SET TERMOUT OFF pagesize 5000 tab off verify off linesize 999 trimspool on trimout on null ""
SET TERMOUT ON
COL force_matching_signature FOR 99999999999999999999
WITH metrics AS(
SELECT
&1
, MIN(CAST(begin_interval_time AS DATE)) first_seen
, MAX(CAST(end_interval_time AS DATE)) last_seen
, SUM(executions_delta) executions
, ROUND(SUM(elapsed_time_delta ) / CASE WHEN SUM(executions_delta) = 0 THEN 1 ELSE SUM(executions_delta) END) ela_us_per_exec
, ROUND(SUM(cpu_time_delta ) / NULLIF(SUM(executions_delta),0)) cpu_us_per_exec
, ROUND(SUM(rows_processed_delta) / NULLIF(SUM(executions_delta),0),1) rows_per_exec
, ROUND(SUM(buffer_gets_delta ) / NULLIF(SUM(executions_delta),0),1) lios_per_exec
, ROUND(SUM(disk_reads_delta ) / NULLIF(SUM(executions_delta),0),1) blkrd_per_exec
, ROUND(SUM(iowait_delta ) / NULLIF(SUM(executions_delta),0)) iow_us_per_exec
, ROUND(SUM(iowait_delta ) / NULLIF(SUM(physical_read_requests_delta)+SUM(physical_write_requests_delta),0),1) avg_iow_us
, ROUND(SUM(clwait_delta ) / NULLIF(SUM(executions_delta),0)) clw_us_per_exec
, ROUND(SUM(apwait_delta ) / NULLIF(SUM(executions_delta),0)) apw_us_per_exec
, ROUND(SUM(ccwait_delta ) / NULLIF(SUM(executions_delta),0)) ccw_us_per_exec
FROM
dba_hist_snapshot sn
, dba_hist_sqlstat st
WHERE
-- join conditions
sn.snap_id = st.snap_id
AND sn.dbid = st.dbid
AND sn.instance_number = st.instance_number
-- filter conditions
AND executions_delta > 0
AND begin_interval_time >= &3
AND end_interval_time <= &4
GROUP BY
&1, &2
)
, sq AS (
SELECT
&1
, executions
, ela_us_per_exec
, STDDEV(ela_us_per_exec) OVER (PARTITION BY &1) ela_us_stddev
FROM
metrics
), norm AS (
SELECT
&1
, SUM(executions) total_executions
, MIN(ela_us_per_exec) / 1000000 min_s_per_exec
, MAX(ela_us_per_exec) / 1000000 max_s_per_exec
, ela_us_stddev / MIN(ela_us_per_exec) ela_norm_stddev
, ela_us_stddev / 1000000 seconds_stddev
FROM
sq
GROUP BY
&1
, ela_us_stddev
)
SELECT
*
FROM
norm
WHERE
ela_norm_stddev > 3
AND max_s_per_exec > 1 -- avoid reporting very short queries
ORDER BY
ela_norm_stddev DESC
/