2026-03-12 20:23:15
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342
tpt/exadata/exafriendly.sql
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342
tpt/exadata/exafriendly.sql
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-- 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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--------------------------------------------------------------------------------
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-- File name: exafriendly.sql (report non-exadata-friendly SQL and their stats)
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--
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-- Purpose: This script is a collection of queries against ASH, which will
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-- report and drill down into workloads which don't use Exadata smart
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-- scanning and are doing buffered full table scans or random single
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-- block reads instead. It uses the 11g new ASH columns
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-- (SQL_PLAN_OPERATION, SQL_PLAN_OPTIONS) which give SQL plan line
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-- level activity breakdown.
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--
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-- Note that this script is not a single SQL performance diagnosis tool,
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-- for looking into a single SQL, use the SQL Monitoring report. This
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-- exafriendly.sql script is aimed for giving you a high-level
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-- bird's-eye view of "exadata-friendiness" of your workloads, so you'd
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-- detect systemic problems and drill down where needed.
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--
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-- Usage: @exafriendly.sql <ash_data_source>
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--
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-- Examples: @exafriendly.sql gv$active_session_history
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--
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-- @exafriendly.sql "dba_hist_active_sess_history WHERE snap_time > SYSDATE-1"
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--
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-- Author: Tanel Poder ( http://blog.tanelpoder.com | tanel@tanelpoder.com )
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--
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-- Copyright: (c) 2012 All Rights Reserved
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--
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--
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-- Other: I strongly recommend you to read through the script to understand
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-- what it's doing and how the drilldown happens. You likely need
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-- to customize things (or at least adjust filters) when you diagnose
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-- stuff in your environment.
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--
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--------------------------------------------------------------------------------
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set timing on tab off verify off linesize 999 pagesize 5000 trimspool on trimout on null ""
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COL wait_class FOR A20
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COL event FOR A40
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COL plan_line FOR A40
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COL command_name FOR A15
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COL pct FOR 999.9
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define ash=&1
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SELECT MAX(sample_time) - MIN(sample_time)
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FROM &ash
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/
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PROMPT Report the top active SQL statements regardless of their CPU usage/wait event breakdown
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SELECT * FROM (
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SELECT
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sql_id
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM &ash
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WHERE
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session_type = 'FOREGROUND'
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GROUP BY
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sql_id
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report the top session state/wait class breakdown
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SELECT * FROM (
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SELECT
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session_state,wait_class
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM &ash
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GROUP BY
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session_state,wait_class
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report the top session state/wait event breakdown (just like TOP-5 Timed Events in AWR)
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SELECT * FROM (
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SELECT
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session_state,wait_class,event
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM &ash
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GROUP BY
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session_state,wait_class,event
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report the top SQL waiting for buffered single block reads
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SELECT * FROM (
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SELECT
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session_state,wait_class,event,sql_id
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM &ash
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WHERE
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session_state = 'WAITING'
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AND event = 'cell single block physical read'
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GROUP BY
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session_state,wait_class,event,sql_id
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report the top SQL waiting for buffered single block reads the most (with sampled execution count)
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SELECT * FROM (
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SELECT
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sql_plan_operation||' '||sql_plan_options plan_line,event,sql_id
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, COUNT(DISTINCT(sql_exec_id)) noticed_executions
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM &ash
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WHERE
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session_state = 'WAITING'
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AND event = 'cell single block physical read'
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GROUP BY
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sql_plan_operation||' '||sql_plan_options,event,sql_id
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report what kind of SQL execution plan operations, executed by which user wait for buffered single block reads the most
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SELECT * FROM (
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SELECT
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sql_plan_operation||' '||sql_plan_options plan_line,u.username,event
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM &ash a
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, dba_users u
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WHERE
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a.user_id = u.user_id
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AND session_state = 'WAITING'
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AND event = 'cell single block physical read'
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GROUP BY
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sql_plan_operation||' '||sql_plan_options,event,u.username
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report what kind of execution plan operations wait for buffered single block reads
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SELECT * FROM (
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SELECT
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sql_plan_operation||' '||sql_plan_options plan_line,event
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM &ash
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WHERE
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session_state = 'WAITING'
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AND event = 'cell single block physical read'
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GROUP BY
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sql_plan_operation||' '||sql_plan_options,event
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report what kind of execution plan operations wait for buffered single block reads - against which schemas
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SELECT * FROM (
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SELECT
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sql_plan_operation||' '||sql_plan_options plan_line,p.object_owner,event
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM
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v$active_session_history a
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, v$sql_plan p
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WHERE
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a.sql_id = p.sql_id
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AND a.sql_child_number = p.child_number
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AND a.sql_plan_line_id = p.id
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AND session_state = 'WAITING'
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AND event = 'cell single block physical read'
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GROUP BY
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sql_plan_operation||' '||sql_plan_options,p.object_owner,event
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report what kind of execution plan operations wait for buffered single block reads - against which objects
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SELECT * FROM (
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SELECT
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sql_plan_operation||' '||sql_plan_options plan_line,p.object_owner,p.object_name,event
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM
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v$active_session_history a
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, v$sql_plan p
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WHERE
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a.sql_id = p.sql_id
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AND a.sql_child_number = p.child_number
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AND a.sql_plan_line_id = p.id
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AND session_state = 'WAITING'
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AND event = 'cell single block physical read'
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GROUP BY
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sql_plan_operation||' '||sql_plan_options,p.object_owner,p.object_name,event
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report which SQL command type consumes the most time (broken down by wait class)
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SELECT * FROM (
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SELECT
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command_name,session_state,wait_class
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM &ash, v$sqlcommand
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WHERE &ash..sql_opcode = v$sqlcommand.command_type
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GROUP BY
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command_name,session_state,wait_class
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report what kind of execution plan operations wait for buffered multiblock reads the most
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SELECT * FROM (
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SELECT
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sql_plan_operation||' '||sql_plan_options plan_line,event
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM
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&ash
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WHERE
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session_state = 'WAITING'
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AND event = 'cell multiblock physical read'
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GROUP BY
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sql_plan_operation||' '||sql_plan_options,event
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report what kind of execution plan operations wait for buffered multiblock reads - against which objects
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SELECT * FROM (
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SELECT
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sql_plan_operation||' '||sql_plan_options plan_line,p.object_owner,p.object_name,event
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM
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v$active_session_history a
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, v$sql_plan p
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WHERE
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a.sql_id = p.sql_id
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AND a.sql_child_number = p.child_number
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AND a.sql_plan_line_id = p.id
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AND session_state = 'WAITING'
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AND event = 'cell multiblock physical read'
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GROUP BY
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sql_plan_operation||' '||sql_plan_options,p.object_owner,p.object_name,event
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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PROMPT Report any PARALLEL full table scans which use buffered reads (in-memory PX)
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SELECT * FROM (
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SELECT
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sql_id
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, sql_plan_operation||' '||sql_plan_options plan_line
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, CASE WHEN qc_session_id IS NULL THEN 'SERIAL' ELSE 'PARALLEL' END is_parallel
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-- , px_flags
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, session_state
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, wait_class
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, event
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, COUNT(*)
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM &ash
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WHERE
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sql_plan_operation = 'TABLE ACCESS'
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AND sql_plan_options = 'STORAGE FULL'
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AND session_state = 'WAITING'
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AND event IN ('cell single block physical read', 'cell multiblock physical read', 'cell list of blocks physical read')
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AND qc_session_id IS NOT NULL -- is a px session
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GROUP BY
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sql_id
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, sql_plan_operation||' '||sql_plan_options
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, CASE WHEN qc_session_id IS NULL THEN 'SERIAL' ELSE 'PARALLEL' END --is_parallel
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-- , px_flags
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, session_state
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, wait_class
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, event
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ORDER BY COUNT(*) DESC
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)
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WHERE rownum <= 20
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/
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DEF sqlid=4mpjt2rhwd1p4
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PROMPT Report a single SQL_ID &sqlid
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SELECT * FROM (
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SELECT
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sql_plan_operation||' '||sql_plan_options plan_line,session_state,event
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, SUM(1) seconds
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, ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100, 1) pct
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FROM &ash
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WHERE
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sql_id = '&sqlid'
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GROUP BY
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sql_plan_operation||' '||sql_plan_options,session_state,event
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ORDER BY
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seconds DESC
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)
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WHERE
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rownum <= 10
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/
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Reference in New Issue
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