🥇Youn nan metòd pou jwenn istwa fèmen nan PostgreSQL

Kontinyasyon atik la "Yon tantativ pou kreye yon analogue ASH pou PostgreSQL ".

Atik la pral konsidere epi montre sou kesyon espesifik ak egzanp ki enfòmasyon itil yo ka jwenn lè l sèvi avèk istwa pg_locks gade.

Avètisman
Akòz kado a nan sijè a ak enkonplè nan peryòd tès la, atik la ka gen erè. Kritik ak kòmantè yo akeyi ak espere.

Antre done

pg_locks istwa reprezantasyon

achiv_bloke

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 
);

Fondamantalman, tab la sanble ak tab la archive_pg_stat_activitydekri an plis detay isit la - pg_stat_statements + pg_stat_activity + loq_query = pg_ash? ak isit la - Yon tantativ pou kreye yon analogue ASH pou PostgreSQL.

Pou ranpli yon kolòn queryid fonksyon yo itilize

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;

Eksplikasyon: valè kolòn queryid la mete ajou nan tablo history_locking, epi lè sa a lè yo kreye yon nouvo patisyon pou tab archive_locking, valè a pral estoke nan valè istorik.

Выходные данные

Enfòmasyon jeneral sou pwosesis an jeneral.

TANTAN POU KADYE PA LOCKTYPES

Ankèt

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

Egzanp

| TANTAN POU KALDÈ PA LOCKTYPES +--------------------+----------------------- -------+-------------------- | locktype| mòd| dire +--------------------+-------------------- ---+-- ------------------ | tranzaksyonid| sharelock| 19:39:26 | tuple| AccessExclusiveLock| 00:03:35 +--------------------+----------------------- -------+--------------------

PRAN KALDÈ PAR KARMÈ

Ankèt

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

Egzanp

| TAKING OF LOCKS PA LOCKTYPES +--------------------+----------------------- -------+-------------------- | locktype| mòd| dire +--------------------+-------------------- ---+-- ------------------ | relasyon| RowExclusiveLock| 51:11:10 | virtualxid| ExclusiveLock| 48:10:43 | tranzaksyonid| ExclusiveLock| 44:24:53 | relasyon| AccessShareLock| 20:06:13 | tuple| AccessExclusiveLock| 17:58:47 | tuple| ExclusiveLock| 01:40:41 | relasyon| ShareUpdateExclusiveLock| 00:26:41 | objè| RowExclusiveLock| 00:00:01 | tranzaksyonid| sharelock| 00:00:01 | pwolonje| ExclusiveLock| 00:00:01 +--------------------+----------------------- -------+--------------------

Enfòmasyon detaye pou demann espesifik keryid

TANTAN KADYE BY LOCKTYPES BY QUERYID

Ankèt

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

Egzanp

| TANTAN POU KÒD BY LOCKTYPES BY QUERYID +----------+-------------------------+----- ---------------+-----------------------------+--- ------------------+-------------------+---------- - --------- | pid| locktype| mòd| te kòmanse| queryid| blocking_pids| dire +----------+------------------------+------------ ---------+-----------------------------+---------- ---+--------------------+----------------- --- | 11288| tranzaksyonid| sharelock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| tranzaksyonid| sharelock| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| tranzaksyonid| sharelock| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| tranzaksyonid| sharelock| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| tranzaksyonid| sharelock| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| tranzaksyonid| sharelock| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| tranzaksyonid| sharelock| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| tranzaksyonid| sharelock| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| tranzaksyonid| sharelock| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| tranzaksyonid| sharelock| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| tranzaksyonid| sharelock| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

PRAN KADYE PAR LOCKTYPES BY QUERYID

Ankèt

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

Egzanp

| PRAN KADRA PAR LOCKTYPES PAR QUERYID +----------+-------------------------+------ --------------+-----------------------------+---- -+--------------------+----------- -------- | pid| locktype| mòd| te kòmanse| queryid| blocking_pids| dire +----------+------------------------+------------ ---------+-----------------------------+---------- -----------+--------------------+----------------- --- | 11288| relasyon| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| tranzaksyonid| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| relasyon| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| relasyon| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11092| virtualxid| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| virtualxid| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| tranzaksyonid| ExclusiveLock| 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

Sèvi ak istwa bloke lè w ap analize ensidan pèfòmans yo.

Yon rechèch ak queryid=389015618226997618 egzekite pa yon pwosesis ak pid=11288 ap tann pou yon seri depi 2019-09-17 10:00:00 pou 3 minit.
Lock a te kenbe pa yon pwosesis ak pid = 11092
Yon pwosesis ki gen pid = 11092 k ap egzekite yon rechèch ak queryid = 389015618226997618 depi 2019-09-17 10:00:00 kenbe seri a pandan 3 minit.

Total

Koulye a, mwen espere, bagay ki pi enteresan ak itil yo pral kòmanse - kolekte estatistik ak analize ka sou istwa a nan ap atann ak bloke.

Nan lavni, mwen ta renmen kwè, ou pral jwenn yon seri kèk kalite nòt (menm jan ak metalink Oracle a).

An jeneral, se pou rezon sa a ke metodoloji yo itilize a parèt pi vit posib pou familyarize piblik la.

Nan fiti prè mwen pral eseye mete pwojè a sou github.

Sous: www.habr.com

Youn nan metòd pou jwenn istwa fèmen nan PostgreSQL

Antre done

pg_locks istwa reprezantasyon

Выходные данные

TANTAN POU KADYE PA LOCKTYPES

PRAN KALDÈ PAR KARMÈ

TANTAN KADYE BY LOCKTYPES BY QUERYID

PRAN KADYE PAR LOCKTYPES BY QUERYID

Total

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