🥇 Aon de na dòighean air eachdraidh glasaidh fhaighinn ann am PostgreSQL

A’ leantainn leis an artaigil "Oidhirp ri analogue de ASH a chruthachadh airson PostgreSQL ".

Beachdaichidh agus seallaidh an artaigil air ceistean agus eisimpleirean sònraichte dè am fiosrachadh feumail a gheibhear a’ cleachdadh eachdraidh seallaidh pg_locks.

Rabhadh
Air sgàth cho ùr sa tha a’ chuspair agus cho neo-iomlanachd sa tha an ùine deuchainn, faodaidh mearachdan a bhith san artaigil. Tha fàilte air càineadh agus beachdan agus thathar an dùil.

Dàta inntrigidh

pg_locks eachdraidh riochdachaidh

tasglann_glasadh

CREATE TABLE archive_locking 
(       timepoint timestamp without time zone ,
	locktype text ,
	relation oid ,
	mode text ,
	tid xid ,
	vtid text ,
	pid integer ,
	blocking_pids integer[] ,
	granted boolean ,
        queryid bigint 
);

Gu bunaiteach, tha an clàr coltach ris a’ chlàr archive_pg_stat_activeair a mhìneachadh nas mionaidiche an seo - pg_stat_statements +pg_stat_activity +loq_query = pg_ash? agus an seo - Oidhirp ri analogue de ASH a chruthachadh airson PostgreSQL.

Airson colbh a lìonadh ceisteach tha gnìomh air a chleachdadh

update_history_locking_by_queryid

--update_history_locking_by_queryid.sql
CREATE OR REPLACE FUNCTION update_history_locking_by_queryid() RETURNS boolean AS $$
DECLARE
  result boolean ;
  current_minute double precision ; 
  
  start_minute integer ;
  finish_minute integer ;
  
  start_period timestamp without time zone ;
  finish_period timestamp without time zone ;
  
  lock_rec record ; 
  endpoint_rec record ; 
  
  current_hour_diff double precision ;
BEGIN
  RAISE NOTICE '***update_history_locking_by_queryid';
  
  result = TRUE ;
  
  current_minute = extract ( minute from now() );

  SELECT * FROM endpoint WHERE is_need_monitoring
  INTO endpoint_rec ;
  
  current_hour_diff = endpoint_rec.hour_diff ;
  
  IF current_minute < 5 
  THEN
	RAISE NOTICE 'Current time is less than 5 minute.';
	
	start_period = date_trunc('hour',now()) + (current_hour_diff * interval '1 hour');
    finish_period = start_period - interval '5 minute' ;
  ELSE 
    finish_minute =  extract ( minute from now() ) / 5 ;
    start_minute =  finish_minute - 1 ;
  
    start_period = date_trunc('hour',now()) + interval '1 minute'*start_minute*5+(current_hour_diff * interval '1 hour');
    finish_period = date_trunc('hour',now()) + interval '1 minute'*finish_minute*5+(current_hour_diff * interval '1 hour') ;
    
  END IF ;  
  
  RAISE NOTICE 'start_period = %', start_period;
  RAISE NOTICE 'finish_period = %', finish_period;

	FOR lock_rec IN   
	WITH act_queryid AS
	 (
		SELECT 
				pid , 
				timepoint ,
				query_start AS started ,			
				MAX(timepoint) OVER (PARTITION BY pid ,	query_start   ) AS finished ,			
				queryid 
		FROM 
				activity_hist.history_pg_stat_activity 			
		WHERE 			
				timepoint BETWEEN start_period and 
								  finish_period
		GROUP BY 
				pid , 
				timepoint ,  
				query_start ,
				queryid 
	 ),
	 lock_pids AS
		(
			SELECT
				hl.pid , 
				hl.locktype  ,
				hl.mode ,
				hl.timepoint , 
				MIN ( timepoint ) OVER (PARTITION BY pid , locktype  ,mode ) as started 
			FROM 
				activity_hist.history_locking hl
			WHERE 
				hl.timepoint between start_period and 
								     finish_period
			GROUP BY 
				hl.pid , 
				hl.locktype  ,
				hl.mode ,
				hl.timepoint 
		)
	SELECT 
		lp.pid , 
		lp.locktype  ,
		lp.mode ,
		lp.timepoint ,     
		aq.queryid 
	FROM lock_pids 	lp LEFT OUTER JOIN act_queryid aq ON ( lp.pid = aq.pid AND lp.started BETWEEN aq.started AND aq.finished )
	WHERE aq.queryid IS NOT NULL 
	GROUP BY  
		lp.pid , 
		lp.locktype  ,
		lp.mode ,
		lp.timepoint , 
		aq.queryid
	LOOP
		UPDATE activity_hist.history_locking SET queryid = lock_rec.queryid 
		WHERE pid = lock_rec.pid AND locktype = lock_rec.locktype AND mode = lock_rec.mode AND timepoint = lock_rec.timepoint ;	
	END LOOP;    
  
  RETURN result ;
END
$$ LANGUAGE plpgsql;

Mìneachadh: tha luach a’ cholbh queryid air ùrachadh sa chlàr history_locking, agus an uairsin nuair a thèid sgaradh ùr a chruthachadh airson a’ chlàr archive_locking, thèid an luach a stòradh ann an luachan eachdraidheil.

Toraidhean

Fiosrachadh coitcheann mu phròiseasan san fharsaingeachd.

A 'feitheamh ri glasan le locktypes

Iarrtas

WITH
t AS
(
	SELECT 
		locktype  ,
		mode ,
		count(*) as total 
	FROM 
		activity_hist.archive_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
	GROUP BY 
		locktype  ,
		mode  
)
SELECT 
	locktype  ,
	mode ,
	total * interval '1 second' as duration			
FROM t 		
ORDER BY 3 DESC

Eisimpleir:

| A’ feitheamh ri glasan le lockTYPES +-------------------+--------------------- -------+-------------------- | seòrsa glas | modh | fad + -------------------+------------------- ---+-- ----------------- | malairt | glas-roinn | 19:39:26 | tuple | AccessExclusiveLock | 00:03:35 +------------------+--------------------- ------+------------------

A 'GABHAIL DE CHUIDEAN AIRSON LOCKTYPES

Iarrtas

WITH
t AS
(
	SELECT 
		locktype  ,
		mode ,
		count(*) as total 
	FROM 
		activity_hist.archive_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 
		granted
	GROUP BY 
		locktype  ,
		mode  
)
SELECT 
	locktype  ,
	mode ,
	total * interval '1 second' as duration			
FROM t 		
ORDER BY 3 DESC

Eisimpleir:

| A ’GABHAIL A-STEACH AIRSON LOCKTYPES +--------------------+---------------------- -------+-------------------- | seòrsa glas | modh | fad + -------------------+------------------- ---+-- ----------------- | dàimh | RowExclusiveLock | 51:11:10 | mas-fhìor | Glasadh sònraichte | 48:10:43 | malairt | Glasadh sònraichte | 44:24:53 | dàimh | AccessShareLock | 20:06:13 | tuple | AccessExclusiveLock | 17:58:47 | tuple | Glasadh sònraichte | 01:40:41 | dàimh | ShareUpdateExclusiveLock| 00:26:41 | nì | RowExclusiveLock | 00:00:01 | malairt | glas-roinn | 00:00:01 | leudachadh | Glasadh sònraichte | 00:00:01 +------------------+--------------------- ------+------------------

Fiosrachadh mionaideach airson ceistean queryid sònraichte

A' FHitheamh AIRSON glasan-glasaidh a-rèir QUERYID

Iarrtas

WITH
lt AS
(
	SELECT
		pid , 
		locktype  ,
		mode ,
		timepoint , 
		queryid , 
		blocking_pids ,
                MIN ( timepoint ) OVER (PARTITION BY pid , locktype  ,mode ) as started  
	FROM 
		activity_hist.archive_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
	       queryid IS NOT NULL 
	GROUP BY 
	        pid , 
		locktype  ,
		mode ,
		timepoint ,
		queryid ,
		blocking_pids 
)
SELECT 
        lt.pid , 
	lt.locktype  ,
	lt.mode ,			
        lt.started ,
	lt.queryid  ,
	lt.blocking_pids ,
	COUNT(*)  * interval '1 second'	 as duration		
FROM lt 	
GROUP BY 
	lt.pid , 
        lt.locktype  ,
	lt.mode ,			
        lt.started ,
        lt.queryid ,
	lt.blocking_pids 
ORDER BY 4

Eisimpleir:

| A’ feitheamh ri glasan-glasaidh le QUERYID +---------+-----------------------+----- --------------+-----------------------------+--- -----------------+--------------------+--------- - --------- | pid | seòrsa glas | modh | thòisich | ceist | bacadh_pids| fad + ----------+------------------------+---------- --------+----------------------------+-------- ---+-------------------+---------------- --- | 11288| malairt | glas-roinn | 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| malairt | glas-roinn | 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| malairt | glas-roinn | 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| malairt | glas-roinn | 2019-09-17 10:00:21.380921| 389015618226997618| {12213} | 00:01:55 | 11626| malairt | glas-roinn | 2019-09-17 10:00:21.380921| 389015618226997618| {12751} | 00:00:01 | 11629| malairt | glas-roinn | 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| malairt | glas-roinn | 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| malairt | glas-roinn | 2019-09-17 10:05:03.327933| 389015618226997618| {11629} | 00:00:13 | 12007| malairt | glas-roinn | 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| malairt | glas-roinn | 2019-09-17 10:05:03.327933| 389015618226997618| {11288} | 00:00:05 | 12213 | malairt | glas-roinn | 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

A' GABHAIL A BHITH A' CLEACHDADH A BHITH A' TAGHADH AIRSON QUERYID

Iarrtas

WITH
lt AS
(
	SELECT
		pid , 
		locktype  ,
		mode ,
		timepoint , 
		queryid , 
		blocking_pids ,
                MIN ( timepoint ) OVER (PARTITION BY pid , locktype  ,mode ) as started  
	FROM 
		activity_hist.archive_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 
		granted AND
		queryid IS NOT NULL 
	GROUP BY 
	        pid , 
		locktype  ,
		mode ,
		timepoint ,
		queryid ,
		blocking_pids 
)
SELECT 
        lt.pid , 
	lt.locktype  ,
	lt.mode ,			
        lt.started ,
	lt.queryid  ,
	lt.blocking_pids ,
	COUNT(*)  * interval '1 second'	 as duration			
FROM lt 	
GROUP BY 
	lt.pid , 
	lt.locktype  ,
	lt.mode ,			
        lt.started ,
	lt.queryid ,
	lt.blocking_pids 
ORDER BY 4

Eisimpleir:

| A’ gabhail glasan le glasan-seòrsa le QUERYID +---------+------------------------+------ -------------+-----------------------------+---- -+-------------------+-------------------- pid | seòrsa glas | modh | thòisich | ceist | bacadh_pids| fad + ----------+------------------------+---------- --------+----------------------------+-------- ---+-------------------+---------------- --- | 11288| dàimh | RowExclusiveLock | 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| malairt | Glasadh sònraichte | 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| dàimh | RowExclusiveLock | 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| dàimh | RowExclusiveLock | 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11092| mas-fhìor | Glasadh sònraichte | 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| mas-fhìor | Glasadh sònraichte | 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| malairt | Glasadh sònraichte | 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| tuple | AccessExclusiveLock | 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34

A’ cleachdadh eachdraidh bacaidh nuair a thathar a’ dèanamh anailis air tachartasan coileanaidh.

Tha ceist le queryid=389015618226997618 air a chur gu bàs le pròiseas le pid=11288 air a bhith a’ feitheamh ri glas bho 2019-09-17 10:00:00 airson 3 mionaidean.
Chaidh a’ ghlas a chumail le pròiseas le pid=11092
Chùm pròiseas le pid=11092 a’ cur an gnìomh ceist le queryid=389015618226997618 bho 2019-09-17 10:00:00 a’ ghlas airson 3 mionaidean.

An toradh

A-nis, tha mi an dòchas, tòisichidh an rud as inntinniche agus as fheumaile - a 'cruinneachadh staitistig agus a' sgrùdadh chùisean air eachdraidh sùileachadh agus bacadh.

Anns an àm ri teachd, bu mhath leam a chreidsinn, gheibh thu seata de sheòrsa air choreigin (coltach ri metalink Oracle).

San fharsaingeachd, is ann air an adhbhar seo a tha am modh-obrach a thathar a’ cleachdadh air a thaisbeanadh cho luath ‘s a ghabhas airson eòlas poblach.

Ann an ùine ghoirid feuchaidh mi ris a 'phròiseact a chuir air github.

Source: www.habr.com

Aon de na dòighean air eachdraidh glas fhaighinn ann am PostgreSQL

Dàta inntrigidh

pg_locks eachdraidh riochdachaidh

Toraidhean

A 'feitheamh ri glasan le locktypes

A 'GABHAIL DE CHUIDEAN AIRSON LOCKTYPES

A' FHitheamh AIRSON glasan-glasaidh a-rèir QUERYID

A' GABHAIL A BHITH A' CLEACHDADH A BHITH A' TAGHADH AIRSON QUERYID

An toradh

Cuir beachd ann freagairt a chur dheth