🥇 Ceann de na modhanna chun stair ghlais a fháil in PostgreSQL

Leanúint leis an alt “Iarracht chun analóg ASH a chruthú do PostgreSQL ".

Scrúdóidh agus léireoidh an t-alt, ag baint úsáide as ceisteanna agus samplaí sonracha, cén fhaisnéis úsáideach is féidir a fháil ag baint úsáide as stair an dearcadh pg_locks.

Rabhadh.
Mar gheall ar úrnuacht an ábhair agus an tréimhse tástála neamhchríochnaithe, féadfaidh earráidí a bheith san alt. Fáiltítear go láidir roimh cháineadh agus tuairimí agus táthar ag súil go mór leo.

Sonraí ionchuir

Stair na hionadaíochta pg_locks

cartlann_glasáil

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 
);

Go bunúsach, tá an tábla cosúil leis an tábla archive_pg_stat_ghníomhaíocht, cur síos níos mine anseo - pg_stat_statements +pg_stat_activity +loq_query = pg_ash? agus anseo - Iarracht chun analóg de ASH a chruthú do PostgreSQL.

Chun colún a líonadh queryid úsáidtear feidhm

nuashonrú_stair_glasáil_le_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;

Míniú: déantar luach an cholúin queryid a nuashonrú sa tábla history_locking, agus ansin nuair a chruthaítear deighilt nua don tábla archive_locking, stórálfar an luach sna luachanna stairiúla.

Aschur

Eolas ginearálta ar phróisis go ginearálta.

AG FHEITHIMH AR CHINEÁLACHA Glais

Iarratas

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

Sampla

| AG FEITHICLÍ Glais DE RÉIR ghlais +-----------+--------------------- --------- ------------------ | cineál glas | mód| ré +-------------------+------------------------ --+------------------- | idirbheartaid| ShareLock| 19:39:26 | tupla| AccessExclusiveLock| 00:03:35 +------------------+--------------------- -------+---------

TÓGÁLACHA Glais DE RÉIR CHINEÁLACHA

Iarratas

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

Sampla

| AG TABHAIRT Glais DE RÉIR ghlais +-------------------------------------------- --------+------------------ | cineál glas | mód| ré +-------------------+------------------------ --+------------------- | gaol| RowExclusiveLock| 51:11:10 | fíorúil | Glas Eisiach| 48:10:43 | idirbheartaid| Glas Eisiach| 44:24:53 | gaol| AccessShareLock| 20:06:13 | tupla| AccessExclusiveLock| 17:58:47 | tupla| Glas Eisiach| 01:40:41 | gaol| ShareUpdateExclusiveLock| 00:26:41 | réad| RowExclusiveLock| 00:00:01 | idirbheartaid| ShareLock| 00:00:01 | síneadh | Glas Eisiach| 00:00:01 +------------------+--------------------- -------+---------

Faisnéis mhionsonraithe ar iarratais cheistiúcháin ar leith

AG FHEITHIMH AR CHINEÁLACHA GLAS DE CHUID QUERYID

Iarratas

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

Sampla

| AG FEITHICLÍ Glais DE RÉIR ghlais QUERYID +----------+---------+---- ------------- +------------------------------ ---------------- -+-------------------+---------- --------- pid| cineál glas | mód| thosaigh| ceisteach| ag bacadh_pids| ré +---------+-----------------------+---------- --------+--------------------------+---------- --------+-------------------+----------------- - | 11288| idirbheartaid| ShareLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| idirbheartaid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| idirbheartaid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| idirbheartaid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| idirbheartaid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| idirbheartaid| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| idirbheartaid| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| idirbheartaid| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| idirbheartaid| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| idirbheartaid| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| idirbheartaid| ShareLock| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

AG TABHAIRT Glais DE RÉIR GLAS DE CHUID QUERYID

Iarratas

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

Sampla

| AG TABHAIRT Glais DE RÉIR GLAS AG QUERYID +----------+----------+----- --------------+ --------------------------+---- ----------------+ -------------------+------------------- | pid| cineál glas | mód| thosaigh| ceisteach| ag bacadh_pids| ré +---------+-----------------------+---------- --------+----------------------------+-------- ----------+-------------------+---------------- --- | 11288| gaol| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| idirbheartaid| Glas Eisiach| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| gaol| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| gaol| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11092| fíorúil | Glas Eisiach| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| fíorúil | Glas Eisiach| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| idirbheartaid| Glas Eisiach| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| tupla| AccessExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34

Úsáid stair ghlas chun teagmhais feidhmíochta a anailísiú.

Bhí iarratas le queryid=389015618226997618 curtha i gcrích ag próiseas le pid=11288 ag fanacht le blocáil ag tosú ó 2019-09-17 10:00:00 ar feadh 3 nóiméad.
Coinníodh an glas trí phróiseas le pid=11092
Choinnigh próiseas ina raibh pid=11092 ag déanamh iarratais le queryid=389015618226997618 ag tosú ó 2019-09-17 10:00:00 an glas ar feadh 3 nóiméad.

Iomlán na

Anois, tá súil agam, cuirfear tús leis an gcuid is suimiúla agus is úsáideach - staitisticí a bhailiú agus anailís a dhéanamh ar chásanna ar stair feithimh agus blocálacha.

Sa todhchaí, ba mhaith liom a chreidiúint, gheobhaidh muid sraith de roinnt nótaí (cosúil le metalink Oracle).

Go ginearálta, is ar an gcúis seo a chuirtear an mhodheolaíocht a úsáidtear ar fáil do gach duine chomh tapa agus is féidir.

Déanfaidh mé iarracht an tionscadal a phostáil ar github go luath amach anseo.

Foinse: will.com

Ceann de na modhanna chun stair ghlais a fháil i PostgreSQL

Sonraí ionchuir

Stair na hionadaíochta pg_locks

Aschur

AG FHEITHIMH AR CHINEÁLACHA Glais

TÓGÁLACHA Glais DE RÉIR CHINEÁLACHA

AG FHEITHIMH AR CHINEÁLACHA GLAS DE CHUID QUERYID

AG TABHAIRT Glais DE RÉIR GLAS DE CHUID QUERYID

Iomlán na

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