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Oidhirp ri analogue de ASH a chruthachadh airson PostgreSQL

Aithris dhuilgheadas

Gus ceistean PostgreSQL a bharrachadh, tha feum mòr air a’ chomas air eachdraidh gnìomhachd a sgrùdadh, gu sònraichte, feitheamh, glasan, agus staitistig bùird.

Cothroman rim faighinn

Inneal Mion-sgrùdadh eallach obrach eachdraidheil no "AWR airson Postgres": fuasgladh gu math inntinneach, ach chan eil eachdraidh pg_stat_activity agus pg_locks ann.

leudachadh pgsentinel :
«Chan eil a h-uile fiosrachadh cruinnichte air a stòradh ach ann an RAM, agus tha an ìre de chuimhne a thèid a chaitheamh air a riaghladh leis an àireamh de na clàran mu dheireadh a chaidh a stòradh.

Tha an raon queryid air a chur ris - an aon queryid bhon leudachadh pg_stat_statements (feumar ro-stàladh).«

Bhiodh seo, gu dearbh, na chuideachadh mòr, ach is e an rud as duilghe a’ chiad phuing. ”Chan eil a h-uile fiosrachadh cruinnichte air a stòradh ach ann an RAM ”, i.e. tha buaidh air a’ bhunait targaid. A bharrachd air an sin, chan eil eachdraidh glasaidh agus staitistig bùird ann. An fheadhainn sin. tha am fuasgladh sa chumantas neo-iomlan: “Chan eil pasgan deiseil ann airson a stàladh fhathast. Thathas a’ moladh na stòran a luchdachadh sìos agus an leabharlann a chruinneachadh thu fhèin. Feumaidh tu an-toiseach am pasgan “devel” a stàladh airson an fhrithealaiche agad agus an t-slighe gu pg_config a shuidheachadh anns an caochladair PATH.".

San fharsaingeachd, tha tòrr fealla-dhà ann, agus a thaobh droch stòran-dàta toraidh, is dòcha nach bi e comasach dad a dhèanamh leis an fhrithealaiche. Feumaidh sinn rudeigin a dhèanamh dhuinn fhìn a-rithist.

Rabhadh

Mar thoradh air an ìre caran mòr agus mar thoradh air an ùine deuchainn neo-choileanta, tha an artaigil gu ìre mhòr de nàdar fiosrachaidh, seach mar sheata de thràchdas agus toraidhean eadar-mheadhanach.
Thèid stuth nas mionaidiche ullachadh nas fhaide air adhart, ann am pàirtean

Dreach riatanasan airson fuasgladh

Tha e riatanach inneal a leasachadh a leigeas leat stòradh:

pg_stat_activity eachdraidh sealladh
Eachdraidh glasaidh seisean a’ cleachdadh an t-sealladh pg_locks

Feum air fuasgladh- lùghdachadh a’ bhuaidh air an stòr-dàta targaidte.

Beachd coitcheann- tha an t-àidseant cruinneachadh dàta air a chuir air bhog chan ann san stòr-dàta targaid, ach san stòr-dàta sgrùdaidh mar sheirbheis siostaim. Tha, tha cuid de chall dàta comasach, ach chan eil seo deatamach airson aithris, ach chan eil buaidh sam bith air an stòr-dàta targaid a thaobh cuimhne agus àite diosc. Agus a thaobh cleachdadh amar ceangail, chan eil a’ bhuaidh air pròiseasan luchd-cleachdaidh ach glè bheag.

Ìrean buileachaidh

1.Seirbheis bùird

Bithear a’ cleachdadh sgeama air leth airson clàran a stòradh, gus nach dèan e iom-fhillte air mion-sgrùdadh nam prìomh chlàran a thathar a’ cleachdadh.

DROP SCHEMA IF EXISTS activity_hist ;
CREATE SCHEMA activity_hist AUTHORIZATION monitor ;

Cudromach: Chan eil an sgeama air a chruthachadh anns an stòr-dàta targaid, ach anns an stòr-dàta sgrùdaidh.

pg_stat_activity eachdraidh sealladh

Tha clàr air a chleachdadh gus dealbhan gnàthaichte den t-sealladh pg_stat_activity a stòradh

activity_hist.history_pg_stat_activity :

--ACTIVITY_HIST.HISTORY_PG_STAT_ACTIVITY
DROP TABLE IF EXISTS activity_hist.history_pg_stat_activity;
CREATE TABLE activity_hist.history_pg_stat_activity
(
  timepoint timestamp without time zone ,
  datid             oid  , 
  datname           name ,
  pid               integer,
  usesysid          oid    ,
  usename           name   ,
  application_name  text   ,
  client_addr       inet   ,
  client_hostname   text   ,
  client_port       integer,
  backend_start     timestamp with time zone ,
  xact_start        timestamp with time zone ,
  query_start       timestamp with time zone ,
  state_change      timestamp with time zone ,
  wait_event_type   text ,                     
  wait_event        text ,                   
  state             text ,                  
  backend_xid       xid  ,                 
  backend_xmin      xid  ,                
  query             text ,               
  backend_type      text ,  
  queryid           bigint
);

Gus cuir a-steach a luathachadh - gun chlàran-amais no cuingealachaidhean.

Gus an eachdraidh fhèin a stòradh, thathas a’ cleachdadh clàr air a sgaradh:

activity_hist.archive_pg_stat_activity :

DROP TABLE IF EXISTS activity_hist.archive_pg_stat_activity;
CREATE TABLE activity_hist.archive_pg_stat_activity
(
  timepoint timestamp without time zone ,
  datid             oid  , 
  datname           name ,
  pid               integer,
  usesysid          oid    ,
  usename           name   ,
  application_name  text   ,
  client_addr       inet   ,
  client_hostname   text   ,
  client_port       integer,
  backend_start     timestamp with time zone ,
  xact_start        timestamp with time zone ,
  query_start       timestamp with time zone ,
  state_change      timestamp with time zone ,
  wait_event_type   text ,                     
  wait_event        text ,                   
  state             text ,                  
  backend_xid       xid  ,                 
  backend_xmin      xid  ,                
  query             text ,               
  backend_type      text ,
  queryid           bigint
)
PARTITION BY RANGE (timepoint);

Leis nach eil riatanasan sam bith ann airson astar cuir a-steach sa chùis seo, chaidh cuid de chlàran-amais a chruthachadh gus cruthachadh aithisgean a luathachadh.

Eachdraidh casg seisean

Tha clàr air a chleachdadh gus dealbhan gnàthach de ghlasan seisean a stòradh:

gnìomhachd_hist.history_glasadh :

--ACTIVITY_HIST.HISTORY_LOCKING
DROP TABLE IF EXISTS activity_hist.history_locking;
CREATE TABLE activity_hist.history_locking
(
	timepoint timestamp without time zone ,
	locktype text ,
	relation oid ,
	mode text ,
	tid xid ,
	vtid text ,
	pid integer ,
	blocking_pids integer[] ,
	granted boolean
);

Cuideachd, gus cuir a-steach a luathachadh, chan eil clàran-amais no cuingealachaidhean ann.

Gus an eachdraidh fhèin a stòradh, thathas a’ cleachdadh clàr air a sgaradh:

gnìomhachd_hist.archive_glasadh:

DROP TABLE IF EXISTS activity_hist.archive_locking;
CREATE TABLE activity_hist.archive_locking
(
	timepoint timestamp without time zone ,
	locktype text ,
	relation oid ,
	mode text ,
	tid xid ,
	vtid text ,
	pid integer ,
	blocking_pids integer[] ,
	granted boolean	
)
PARTITION BY RANGE (timepoint);

Leis nach eil riatanasan sam bith ann airson astar cuir a-steach sa chùis seo, chaidh cuid de chlàran-amais a chruthachadh gus cruthachadh aithisgean a luathachadh.

2.Filling a-mach an-dràsta eachdraidh

Gus dealbhan seallaidh a chruinneachadh gu dìreach, thèid sgriobt bash a chleachdadh a ruitheas gnìomh plpgsql.

faigh_current_activity.sh

#!/bin/bash
#########################################################
#get_current_activity.sh

ERROR_FILE='/home/demon/get_current_activity'$(date +%Y%m%d-)'T'$(date +%H)$(date +%M)$(date +%S)
host=$1
s_name=$2
s_pass=$3

psql  -A -t -q -v ON_ERROR_STOP=1 -c "SELECT activity_hist.get_current_activity( '$host' , '$s_name' , '$s_pass' )" >/dev/null 2>$ERROR_FILE

line_count=`cat $ERROR_FILE | wc -l`
if [[ $line_count != '0' ]];
then
    rm -f /home/demon/*.err >/dev/null 2>/dev/null
	cp $ERROR_FILE $ERROR_FILE'.err' >/dev/null 2>/dev/null  
fi
rm $ERROR_FILE >/dev/null 2>/dev/null
exit 0

plpgsql Bidh an gnìomh dblink a’ faighinn cothrom air seallaidhean anns an stòr-dàta targaid agus a’ cuir a-steach sreathan ann an clàran seirbheis san stòr-dàta sgrùdaidh.

faigh_current_activity.sql

CREATE OR REPLACE FUNCTION activity_hist.get_current_activity( current_host text , current_s_name text , current_s_pass text ) RETURNS BOOLEAN AS $$
DECLARE 
  database_rec record;
  dblink_str text ;
BEGIN   

	EXECUTE 'SELECT dblink_connect(''LINK1'',''host='||current_host||' port=5432 dbname=postgres'||
	                                         ' user='||current_s_name||' password='||current_s_pass|| ' '')';



--------------------------------------------------------------------
--GET pg_stat_activity stats
	INSERT INTO activity_hist.history_pg_stat_activity
	(
		SELECT * FROM dblink('LINK1',
			'SELECT 
			now() , 
			datid             , 
			datname           ,
			pid               ,
			usesysid              ,
			usename              ,
			application_name     ,
			client_addr          ,
			client_hostname      ,
			client_port       ,
			backend_start         ,
			xact_start            ,
			query_start           ,
			state_change          ,
			wait_event_type    ,                     
			wait_event         ,                   
			state              ,                  
			backend_xid         ,                 
			backend_xmin        ,                
			query              ,               
			backend_type   			
		FROM pg_stat_activity
		') 
		AS t (
		    timepoint 		  timestamp without time zone ,			
			datid             oid  , 
			datname           name ,
			pid               integer,
			usesysid          oid    ,
			usename           name   ,
			application_name  text   ,
			client_addr       inet   ,
			client_hostname   text   ,
			client_port       integer,
			backend_start     timestamp with time zone ,
			xact_start        timestamp with time zone ,
			query_start       timestamp with time zone ,
			state_change      timestamp with time zone ,
			wait_event_type   text ,                     
			wait_event        text ,                   
			state             text ,                  
			backend_xid       xid  ,                 
			backend_xmin      xid  ,                
			query             text ,               
			backend_type      text 			
		)
	);

---------------------------------------	
--ACTIVITY_HIST.HISTORY_LOCKING	
	INSERT INTO activity_hist.history_locking
	(
		SELECT * FROM dblink('LINK1',
			'SELECT 
			now() , 
			lock.locktype,
			lock.relation,
			lock.mode,
			lock.transactionid as tid,
			lock.virtualtransaction as vtid,
			lock.pid,
			pg_blocking_pids(lock.pid), 
			lock.granted
			FROM 	pg_catalog.pg_locks lock LEFT JOIN pg_catalog.pg_database db ON db.oid = lock.database
			WHERE NOT lock.pid = pg_backend_pid()	
		') 
		AS t (
			timepoint timestamp without time zone ,
			locktype text ,
			relation oid , 
			mode text ,
			tid xid ,
			vtid text ,
			pid integer ,
			blocking_pids integer[] ,
			granted boolean
		)
	);
	PERFORM dblink_disconnect('LINK1');
	
	RETURN TRUE ;
END
$$ LANGUAGE plpgsql;

Gus dealbhan seallaidh a chruinneachadh, thathas a’ cleachdadh an t-seirbheis systemd agus dà sgriobt:

pg_current_activity.service

# /etc/systemd/system/pg_current_activity.service
[Unit]
Description=Collect history of pg_stat_activity , pg_locks 
Wants=pg_current_activity.timer

[Service]
Type=forking
StartLimitIntervalSec=0
ExecStart=/home/postgres/pgutils/demon/get_current_activity.sh 10.124.70.40 postgres postgres

[Install]
WantedBy=multi-user.target

pg_current_activity.timer

# /etc/systemd/system/pg_current_activity.timer
[Unit]
Description=Run pg_current_activity.sh every 1 second
Requires=pg_current_activity.service

[Timer]
Unit=pg_current_activity.service
OnCalendar=*:*:0/1
AccuracySec=1

[Install]
WantedBy=timers.target

Sònraich còraichean airson sgriobtaichean:
# chmod 755 pg_current_activity.timer
# chmod 755 pg_current_activity.service

Feuch an tòisich sinn air an t-seirbheis:
# systemctl daemon-reload
# systemctl tòisich pg_current_activity.service

Mar sin, tha eachdraidh bheachdan air a chruinneachadh ann an cruth dealbhan dàrna-às-diog. Gu dearbh, ma tha a h-uile càil air fhàgail mar a tha, bidh na clàran a 'meudachadh gu luath ann am meud agus bidh obair nas cinneasaiche no nas lugha do-dhèanta.

Tha e riatanach tasglann dàta a chuir air dòigh.

3. Eachdraidh tasglann

Airson tasglann, thathas a’ cleachdadh tasglann bùird air an sgaradh *.

Bidh sgaraidhean ùra air an cruthachadh gach uair a thìde, fhad ‘s a thèid seann dàta a thoirt air falbh bho na clàran eachdraidh *, agus mar sin chan eil meud nan clàran eachdraidh * ag atharrachadh mòran agus chan eil an astar cuir a-steach a’ dol sìos thar ùine.

Bithear a’ cruthachadh earrannan ùra leis a’ ghnìomh plpgsql activity_hist.archive_current_activity. Tha an algairim obrach gu math sìmplidh (a’ cleachdadh eisimpleir na h-earrainn airson a’ chlàr archive_pg_stat_activity).

Cruthaich agus lìon earrann ùr

EXECUTE format(
'CREATE TABLE ' || partition_name || 
' PARTITION OF activity_hist.archive_pg_stat_activity FOR VALUES FROM ( %L ) TO ( %L ) ' , 
to_char(date_trunc('year', partition_min_range ),'YYYY')||'-'||
to_char(date_trunc('month', partition_min_range ),'MM')||'-'||
to_char(date_trunc('day', partition_min_range ),'DD')||' '||
to_char(date_trunc('hour', partition_min_range ),'HH24')||':00', 
to_char(date_trunc('year', partition_max_range ),'YYYY')||'-'||
to_char(date_trunc('month', partition_max_range ),'MM')||'-'||
to_char(date_trunc('day', partition_max_range ),'DD')||' '||
to_char(date_trunc('hour', partition_max_range ),'HH24')||':00'
);

INSERT INTO activity_hist.archive_pg_stat_activity
(
	SELECT 	* 
	FROM 	activity_hist.history_pg_stat_activity
	WHERE 	timepoint BETWEEN partition_min_range AND partition_max_range 		
);

Cruthachadh clàran-amais

EXECUTE format	(
'CREATE INDEX '||index_name||
' ON '||partition_name||' ( wait_event_type , backend_type , timepoint )' 
);

EXECUTE format	('CREATE INDEX '||index_name||
' ON '||partition_name||' ( wait_event_type , backend_type , timepoint , queryid )' 
);

A' toirt air falbh seann dàta on chlàr history_pg_stat_activity

DELETE 
FROM 	activity_hist.history_pg_stat_activity
WHERE 	timepoint < partition_max_range;

Gu dearbh, bho àm gu àm, thèid seann earrannan a dhubhadh às mar rud nach eil riatanach.

Aithisgean bunaiteach

Gu fìrinneach, carson a tha seo uile ga dhèanamh? Gus aithisgean fhaighinn a tha gu math neo-shoilleir a 'cuimhneachadh air AWR Oracle.

Tha e cudromach a chur ris gus am faigh thu aithisgean, feumaidh tu ceangal a thogail eadar na seallaidhean pg_stat_activity agus pg_stat_statements. Tha na clàran ceangailte le bhith a' cur colbh 'queryid' ris na clàran 'history_pg_stat_activity', 'archive_pg_stat_activity'. Tha an dòigh air luach colbh a chur ris nas fhaide na raon an artaigil seo agus tha e air a mhìneachadh an seo - pg_stat_statements +pg_stat_activity +loq_query = pg_ash? .

Àm CPU IOMLAN AIRSON CEISTEANAN

Iarrtas:

WITH hist AS
(
SELECT 
	aa.query ,aa.queryid ,			
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.archive_pg_stat_activity aa
WHERE timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND  pg_stat_history_end+(current_hour_diff * interval '1 hour')  AND backend_type = 'client backend' AND datname != 'postgres' AND	( aa.wait_event_type IS NULL  ) ANDaa.state = 'active'
GROUP BY aa.wait_event_type , aa.wait_event , aa.query ,aa.queryid		
UNION 
SELECT 
	ha.query ,ha.queryid,
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.history_pg_stat_activity_for_reports ha
WHERE timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour')  AND 	backend_type = 'client backend' AND datname != 'postgres' AND ( ha.wait_event_type IS NULL  )AND ha.state = 'active'
GROUP BY ha.wait_event_type , ha.wait_event , ha.query ,ha.queryid		
)
SELECT 	query , queryid , SUM( duration ) as duration 
FROM hist
GROUP BY  query , queryid 
ORDER BY 3 DESC

Eisimpleir:

-------------------------------------------------------------------
| TOTAL CPU TIME FOR QUERIES : 07:47:36
+----+----------------------------------------+--------------------
|   #|                                 queryid|            duration
+----+----------------------------------------+--------------------
|   1|                      389015618226997618|            04:28:58
|   2|                                        |            01:07:29
|   3|                     1237430309438971376|            00:59:38
|   4|                     4710212362688288619|            00:50:48
|   5|                       28942442626229688|            00:15:50
|   6|                     9150846928388977274|            00:04:46
|   7|                    -6572922443698419129|            00:00:06
|   8|                                        |            00:00:01
+----+----------------------------------------+--------------------

IOMLAN FHEASGAIR AIRSON CEISTEAN

Iarrtas:

WITH hist AS
(
SELECT 
	aa.query ,aa.queryid ,			
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.archive_pg_stat_activity aa
WHERE timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour')  AND 
	backend_type = 'client backend' AND datname != 'postgres' AND
	( aa.wait_event_type IS NOT NULL  ) 
GROUP BY aa.wait_event_type , aa.wait_event , aa.query ,aa.queryid		
UNION 
SELECT 
	ha.query ,ha.queryid,
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.history_pg_stat_activity_for_reports ha
WHERE timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour')  AND 
	backend_type = 'client backend' AND datname != 'postgres' AND				
	( ha.wait_event_type IS NOT NULL  )
GROUP BY ha.wait_event_type , ha.wait_event , ha.query ,ha.queryid		
)
SELECT 	query , queryid , SUM( duration ) as duration 
FROM hist
GROUP BY  query , queryid 
ORDER BY 3 DESC

Eisimpleir:

-------------------------------------------------------------------
| TOTAL WAITINGS TIME FOR QUERIES : 21:55:04
+----+----------------------------------------+--------------------
|   #|                                 queryid|            duration
+----+----------------------------------------+--------------------
|   1|                      389015618226997618|            16:19:05
|   2|                                        |            03:47:04
|   3|                     8085340880788646241|            00:40:20
|   4|                     4710212362688288619|            00:13:35
|   5|                     9150846928388977274|            00:12:25
|   6|                       28942442626229688|            00:11:32
|   7|                     1237430309438971376|            00:09:45
|   8|                     2649515222348904837|            00:09:37
|   9|                                        |            00:03:45
|  10|                     3167065002719415275|            00:02:20
|  11|                     5731212217001535134|            00:02:13
|  12|                     8304755792398128062|            00:01:31
|  13|                     2649515222348904837|            00:00:59
|  14|                     2649515222348904837|            00:00:22
|  15|                                        |            00:00:12
|  16|                     3422818749220588372|            00:00:08
|  17|                    -5730801771815999400|            00:00:03
|  18|                    -1473395109729441239|            00:00:02
|  19|                     2404820632950544954|            00:00:02
|  20|                    -6572922443698419129|            00:00:02
|  21|                     2369289265278398647|            00:00:01
|  22|                      180077086776069052|            00:00:01
+----+----------------------------------------+--------------------

FEITHEAMH AIRSON CEISTEAN

Iarrtasan:

WITH hist AS
(
SELECT 
	aa.wait_event_type , aa.wait_event 
FROM 	activity_hist.archive_pg_stat_activity aa
WHERE timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND 
	backend_type = 'client backend' AND datname != 'postgres' AND
	aa.wait_event IS NOT NULL 
GROUP BY aa.wait_event_type , aa.wait_event
UNION 
SELECT 
	ha.wait_event_type , ha.wait_event 
FROM 	activity_hist.history_pg_stat_activity_for_reports ha
WHERE timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND 
	backend_type = 'client backend' AND datname != 'postgres' AND
	ha.wait_event IS NOT NULL 
GROUP BY ha.wait_event_type , ha.wait_event		
)
SELECT 	wait_event_type , wait_event 
FROM hist
GROUP BY wait_event_type , wait_event
ORDER BY 1 ASC,2 ASC

----------------------------------------------------------------------

WITH hist AS
(
SELECT 
	aa.wait_event_type , aa.wait_event , aa.query ,aa.queryid ,			
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.archive_pg_stat_activity aa
WHERE timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND 
	backend_type = 'client backend' AND datname != 'postgres' AND
	( aa.wait_event_type = waitings_stat_rec.wait_event_type AND aa.wait_event = waitings_stat_rec.wait_event )
GROUP BY aa.wait_event_type , aa.wait_event , aa.query ,aa.queryid		
UNION 
SELECT 
	ha.wait_event_type , ha.wait_event , ha.query ,ha.queryid,
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.history_pg_stat_activity_for_reports ha
WHERE timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND 
	backend_type = 'client backend' AND datname != 'postgres' AND				
	( ha.wait_event_type = waitings_stat_rec.wait_event_type AND ha.wait_event = waitings_stat_rec.wait_event )
GROUP BY ha.wait_event_type , ha.wait_event , ha.query ,ha.queryid		
)
SELECT 	query , queryid , SUM( duration ) as duration 
FROM hist
GROUP BY  query , queryid 
ORDER BY 3 DESC

Eisimpleir:

------------------------------------------------
| WAITINGS FOR QUERIES
+-----------------------------------------------
|                      wait_event_type = Client|
|                       wait_event = ClientRead|
|                        Total time  = 00:46:56|
------------------------------------------------
|    #|             queryid|            duration
+-----+--------------------+--------------------
|    1| 8085340880788646241|            00:40:20
|    2|                    |            00:03:45
|    3| 5731212217001535134|            00:01:53
|    4|                    |            00:00:12
|    5| 9150846928388977274|            00:00:09
|    6| 3422818749220588372|            00:00:08
|    7| 1237430309438971376|            00:00:06
|    8|   28942442626229688|            00:00:05
|    9| 4710212362688288619|            00:00:05
|   10|-5730801771815999400|            00:00:03
|   11| 8304755792398128062|            00:00:02
|   12|-6572922443698419129|            00:00:02
|   13|-1473395109729441239|            00:00:02
|   14| 2404820632950544954|            00:00:02
|   15|  180077086776069052|            00:00:01
|   16| 2369289265278398647|            00:00:01

+-----------------------------------------------
|                          wait_event_type = IO|
|                      wait_event = BufFileRead|
|                        Total time  = 00:00:38|
------------------------------------------------
|    #|             queryid|            duration
+-----+--------------------+--------------------
|    1|   28942442626229688|            00:00:38

+-----------------------------------------------

EACHDRAIDH LUACHMHOR GHAIDHEALACH

Iarrtas:

SELECT 
MIN(date_trunc('second',timepoint)) AS started , 
	count(*) * interval '1 second' as duration ,
	pid , blocking_pids , relation , mode , locktype 	 
FROM 
	activity_hist.archive_locking al 
WHERE 
	timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND
	NOT granted AND 
	locktype = 'relation' 
GROUP BY pid , blocking_pids , relation , mode , locktype			
UNION
SELECT 
	MIN(date_trunc('second',timepoint)) AS started , 
	count(*) * interval '1 second' as duration ,
	pid , blocking_pids , relation , mode , locktype
FROM 
	activity_hist.history_locking 
WHERE 
	timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND
	NOT granted AND 
	locktype = 'relation' 
GROUP BY pid , blocking_pids , relation , mode , locktype			
ORDER BY 1

Eisimpleir:

------------------------------------------------ ------------------------------------------------ ------------------------------
| EACHDRAIDH LUACHMHOR GHAIDHEALACH
+---------+---------+-------------------+------ ----+ -------------------+-------------------+--- ----- -----------+----------
| #| pid | thòisich | fad | bacadh_pids| dàimh | modh | seòrsa glasaidh
+---------+---------+-------------------+------ ----+ -------------------+-------------------+--- ----- -----------+----------
| 1| 26224| 2019-09-02 19:32:16| 00:01:45| {26211} | 16541| AccessShareLock | dàimh
| 2| 26390| 2019-09-02 19:34:03| 00:00:53| {26211} | 16541| AccessShareLock | dàimh
| 3| 26391 | 2019-09-02 19:34:03| 00:00:53| {26211} | 16541| AccessShareLock | dàimh
| 4| 26531| 2019-09-02 19:35:27| 00:00:12| {26211} | 16541| AccessShareLock | dàimh
| 5| 27284| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock | dàimh
| 6| 27283| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock | dàimh
| 7| 27286| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock | dàimh
| 8| 27423| 2019-09-02 19:45:24| 00:00:12| {27394}| 16541| AccessShareLock | dàimh
| 9| 27648| 2019-09-02 19:48:06| 00:00:20| {27647}| 16541| AccessShareLock | dàimh
| 10| 27650| 2019-09-02 19:48:06| 00:00:20| {27647}| 16541| AccessShareLock | dàimh
| 11| 27735| 2019-09-02 19:49:08| 00:00:06| {27650} | 16541| AccessExclusiveLock | dàimh
| 12| 28380| 2019-09-02 19:56:03| 00:01:56| {28379} | 16541| AccessShareLock | dàimh
| 13| 28379| 2019-09-02 19:56:03| 00:00:01| 28377| 16541| AccessExclusiveLock | dàimh
| | | | | 28376| |

EACHDRAIDH BLAR CHRIOSDUIDH

Iarrtasan:

SELECT 
blocking_pids 
FROM 
	activity_hist.archive_locking al 
WHERE 
	timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND
	NOT granted AND 
	locktype = 'relation' 
GROUP BY blocking_pids 		
UNION
SELECT 
	blocking_pids 
FROM 
	activity_hist.history_locking 
WHERE 
	timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') AND
	NOT granted AND 
	locktype = 'relation' 
GROUP BY blocking_pids 		
ORDER BY 1

---------------------------------------------------------------

SELECT 
	pid , usename , application_name , datname ,
	MIN(date_trunc('second',timepoint)) as started , 
	count(*) * interval '1 second' as duration ,		 
	state , 
	query
				FROM  	activity_hist.archive_pg_stat_activity
				WHERE 	pid= current_pid AND 
						timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') 						 
				GROUP BY pid , usename , application_name , 
						datname , 
						state_change, 
						state , 
						query 
				UNION
				SELECT 
					pid , usename , application_name , datname ,
					MIN(date_trunc('second',timepoint)) as started , 
					count(*) * interval '1 second' as duration ,		 
					state , 
					query
				FROM  	activity_hist.history_pg_stat_activity_for_reports
				WHERE 	pid= current_pid AND 
						timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') 						 
				GROUP BY pid , usename , application_name , 
						datname , 
						state_change, 
						state , 
						query 
				ORDER BY 5 , 1

Eisimpleir:

------------------------------------------------ ------------------------------------------------ ------------------------------------------------ ---------------------
EACHDRAIDH BLAR CHRIOSDUIDH
+---------+---------+---------+-----+- -------- +------------------+------------------ -+------ ----------------------+---------------- --------- ------------
| #| pid | ainm-cleachdaidh | iarrtas_ainm| ainm-dath | thòisich | fad | stàite | ceist
+---------+---------+---------+-----+- -------- +------------------+------------------ -+------ ----------------------+---------------- --------- ------------
| 1| 26211| tusair | psql | tdb1| 2019-09-02 19:31:54| 00:00:04| leisg |
| 2| 26211| tusair | psql | tdb1| 2019-09-02 19:31:58| 00:00:06| leisg ann an malairt | tòiseachadh;
| 3| 26211| tusair | psql | tdb1| 2019-09-02 19:32:16| 00:01:45| leisg ann an malairt | clàr glasaidh wafer_data;
| 4| 26211| tusair | psql | tdb1| 2019-09-02 19:35:54| 00:01:23 | leisg | tiomnadh;
| 5| 26211| tusair | psql | tdb1| 2019-09-02 19:38:46| 00:00:02| leisg ann an malairt | tòiseachadh;
| 6| 26211| tusair | psql | tdb1| 2019-09-02 19:38:54| 00:00:08| leisg ann an malairt | clàr glasaidh wafer_data;
| 7| 26211| tusair | psql | tdb1| 2019-09-02 19:39:08| 00:42:42| leisg | tiomnadh;
| 8| 26211| tusair | psql | tdb1| 2019-09-03 07:12:07| 00:00:52| gnìomhach | tagh test_del();

Leasachadh.

Tha na ceistean bunaiteach a chaidh a nochdadh agus na h-aithisgean a thàinig às a dhèidh mar-thà a’ dèanamh beatha fada nas fhasa nuair a thathar a’ dèanamh anailis air tachartasan coileanaidh.
Stèidhichte air ceistean bunaiteach, gheibh thu aithisg a tha gu math coltach ri Oracle's AWR.
Eisimpleir geàrr-chunntas

+---------------------------------------------- ---------------------------------
| AITHISG DHAONTAICHTE AIRSON GNÌOMHACHADH AGUS FREAGRADH.

Ri leantainn. An ath loidhne tha cruthachadh eachdraidh glasaidh (pg_stat_locks), tuairisgeul nas mionaidiche air a’ phròiseas lìonadh chlàran.

Source: www.habr.com

Cuir beachd ann