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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.
--------------------------------------------------------------------------------
--
-- File name: ash_wait_chains.sql (v0.2 BETA)
-- Purpose: Display ASH wait chains (multi-session wait signature, a session
-- waiting for another session etc.)
--
-- Author: Tanel Poder
-- Copyright: (c) http://blog.tanelpoder.com
--
-- Usage:
-- @ash_wait_chains <grouping_cols> <filters> <fromtime> <totime>
--
-- Example:
-- @ash_wait_chains username||':'||program2||event2 session_type='FOREGROUND' sysdate-1/24 sysdate
--
-- Other:
-- This script uses only the in-memory V$ACTIVE_SESSION_HISTORY, use
-- @dash_wait_chains.sql for accessiong the DBA_HIST_ACTIVE_SESS_HISTORY archive
--
-- Oracle 10g does not have the BLOCKING_INST_ID column in ASH so you'll need
-- to comment out this column in this script. This may give you somewhat
-- incorrect results in RAC environment with global blockers.
--
--------------------------------------------------------------------------------
COL wait_chain FOR A300 WORD_WRAP
COL "%This" FOR A6
PROMPT
PROMPT -- Display ASH Wait Chain Signatures script v0.4 BETA by Tanel Poder ( http://blog.tanelpoder.com )
WITH
bclass AS (SELECT class, ROWNUM r from v$waitstat),
ash AS (SELECT /*+ QB_NAME(ash) LEADING(a) USE_HASH(u) SWAP_JOIN_INPUTS(u) */
a.*
, u.username
, CASE WHEN a.session_type = 'BACKGROUND' OR REGEXP_LIKE(a.program, '.*\([PJ]\d+\)') THEN
REGEXP_REPLACE(SUBSTR(a.program,INSTR(a.program,'(')), '\d', 'n')
ELSE
'('||REGEXP_REPLACE(REGEXP_REPLACE(a.program, '(.*)@(.*)(\(.*\))', '\1'), '\d', 'n')||')'
END || ' ' program2
, NVL(a.event||CASE WHEN a.event IN ('buffer busy waits', 'gc buffer busy', 'gc buffer busy acquire', 'gc buffer busy release')
THEN ' ['||NVL((SELECT class FROM bclass WHERE r = a.p3),'undo @bclass '||a.p3)||']' ELSE null END,'ON CPU')
|| ' ' event2
, TO_CHAR(CASE WHEN session_state = 'WAITING' THEN p1 ELSE null END, '0XXXXXXXXXXXXXXX') p1hex
, TO_CHAR(CASE WHEN session_state = 'WAITING' THEN p2 ELSE null END, '0XXXXXXXXXXXXXXX') p2hex
, TO_CHAR(CASE WHEN session_state = 'WAITING' THEN p3 ELSE null END, '0XXXXXXXXXXXXXXX') p3hex
FROM
gv$active_session_history a
, dba_users u
WHERE
a.user_id = u.user_id (+)
AND sample_time BETWEEN &3 AND &4
),
ash_samples AS (SELECT DISTINCT sample_id FROM ash),
ash_data AS (SELECT /*+ MATERIALIZE */ * FROM ash),
chains AS (
SELECT
sample_time ts
, level lvl
, session_id sid
, REPLACE(SYS_CONNECT_BY_PATH(&1, '->'), '->', ' -> ')||CASE WHEN CONNECT_BY_ISLEAF = 1 AND d.blocking_session IS NOT NULL THEN ' -> [idle blocker '||d.blocking_inst_id||','||d.blocking_session||','||d.blocking_session_serial#||(SELECT ' ('||s.program||')' FROM gv$session s WHERE (s.inst_id, s.sid , s.serial#) = ((d.blocking_inst_id,d.blocking_session,d.blocking_session_serial#)))||']' ELSE NULL END path -- there's a reason why I'm doing this
--, SYS_CONNECT_BY_PATH(&1, ' -> ')||CASE WHEN CONNECT_BY_ISLEAF = 1 THEN '('||d.session_id||')' ELSE NULL END path
-- , REPLACE(SYS_CONNECT_BY_PATH(&1, '->'), '->', ' -> ')||CASE WHEN CONNECT_BY_ISLEAF = 1 AND LEVEL > 1 THEN ' [sid='||session_id||' seq#='||TO_CHAR(seq#)||']' ELSE NULL END path -- there's a reason why I'm doing this
--, REPLACE(SYS_CONNECT_BY_PATH(&1, '->'), '->', ' -> ') path -- there's a reason why I'm doing this (ORA-30004 :)
, CASE WHEN CONNECT_BY_ISLEAF = 1 THEN d.session_id ELSE NULL END sids
, CONNECT_BY_ISLEAF isleaf
, CONNECT_BY_ISCYCLE iscycle
, d.*
FROM
ash_samples s
, ash_data d
WHERE
s.sample_id = d.sample_id
AND d.sample_time BETWEEN &3 AND &4
CONNECT BY NOCYCLE
( PRIOR d.blocking_session = d.session_id
AND PRIOR d.blocking_inst_id = d.inst_id
AND PRIOR s.sample_id = d.sample_id
)
START WITH &2
)
SELECT * FROM (
SELECT
LPAD(ROUND(RATIO_TO_REPORT(COUNT(*)) OVER () * 100)||'%',5,' ') "%This"
, COUNT(*) seconds
, ROUND(COUNT(*) / ((CAST(&4 AS DATE) - CAST(&3 AS DATE)) * 86400), 1) AAS
, path wait_chain
, TO_CHAR(MIN(sample_time), 'YYYY-MM-DD HH24:MI:SS') first_seen
, TO_CHAR(MAX(sample_time), 'YYYY-MM-DD HH24:MI:SS') last_seen
-- , COUNT(DISTINCT sids)
-- , MIN(sids)
-- , MAX(sids)
FROM
chains
WHERE
isleaf = 1
GROUP BY
&1
, path
ORDER BY
COUNT(*) DESC
)
WHERE
ROWNUM <= 30
/