🥇Яке аз усулҳои гирифтани таърихи қулф дар PostgreSQL

Идомаи мақола "Кӯшиши эҷоди аналоги ASH барои PostgreSQL ".

Мақола дар бораи дархостҳо ва мисолҳои мушаххас баррасӣ ва нишон медиҳад, ки бо истифода аз таърихи дидани pg_locks кадом иттилооти муфидро метавон ба даст овард.

Огоҳӣ.
Аз сабаби нав будани мавзӯъ ва нопурра будани давраи санҷиш, мақола метавонад хатогиҳо дошта бошад. Танқид ва эродҳо қобили қабул ва интизоранд.

Маълумоти воридшавӣ

таърихи намоиши pg_locks

бойгонии_қуфл

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 
);

Асосан, ҷадвал ба ҷадвал монанд аст archive_pg_stat_activityмуфассалтар дар ин ҷо тасвир шудааст - pg_stat_statements + pg_stat_activity + loq_query = pg_ash? ва дар ин ҷо - Кӯшиши эҷоди аналоги ASH барои PostgreSQL.

Барои пур кардани сутун пурсиш функсия истифода мешавад

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;

Шарҳ: арзиши сутуни queryid дар ҷадвали history_locking нав карда мешавад ва он гоҳ вақте ки қисмати нав барои ҷадвали archive_locking эҷод мешавад, арзиш дар арзишҳои таърихӣ нигоҳ дошта мешавад.

Натиҷа

Маълумоти умумӣ дар бораи равандҳои умумӣ.

ИНТИЗОРИИ ҚУЛФҲО БО ТАЙПҲО

Пурсиш

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

Мисол

| ИНТИЗОРИ ҚУЛФҲО БО ТАЙПҲО +--------------------+----------------------- -------+-------------------- | locktype| режим| давомнокӣ +--------------------+--------------------- ---+-- ------------------ | транзакцияид| sharelock| 19:39:26 | tuple| AccessExclusiveLock| 00:03:35 +--------------------+-------------------------------- -------+--------------------

ГИРИФТАНИ ҚУЛФҲО БО ТАЙПҲО

Пурсиш

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

Мисол

| ГИРИФТАНИ ҚУЛФҲО БО ТАЙПҲО +--------------------+----------------------- -------+-------------------- | locktype| режим| давомнокӣ +--------------------+--------------------- ---+-- ------------------ | муносибат | RowExclusiveLock| 51:11:10 | virtualxid| ExclusiveLock| 48:10:43 | транзакцияид| ExclusiveLock| 44:24:53 | муносибат | AccessShareLock| 20:06:13 | tuple| AccessExclusiveLock| 17:58:47 | tuple| ExclusiveLock| 01:40:41 | муносибат | ShareUpdateExclusiveLock| 00:26:41 | объект| RowExclusiveLock| 00:00:01 | транзакцияид| sharelock| 00:00:01 | васеъ | ExclusiveLock| 00:00:01 +-------------------+----------------------- -------+--------------------

Маълумоти муфассал барои дархостҳои мушаххаси queryid

ИНТИЗОРИ Қулфҳо аз рӯи қуфлҳо аз ҷониби QUERYID

Пурсиш

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

Мисол

| ИНТИЗОРИ ҚУЛФҲО БО ТАЙПҲОИ ҚУЛПП АЗ QUERYID +----------+-------------------------+----- ---------------+------------------------------+--- -----------------+-------------------+---------- - --------- | пид| locktype| режим| оғоз | queryid| blocking_pids| давомнокӣ +----------+-------------------------+----------- ---------+------------------------------+--------- ---+-------------------+----------------- --- | 11288| транзакцияид| sharelock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| транзакцияид| sharelock| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| транзакцияид| sharelock| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| транзакцияид| sharelock| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| транзакцияид| sharelock| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| транзакцияид| sharelock| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| транзакцияид| sharelock| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| транзакцияид| sharelock| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| транзакцияид| sharelock| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| транзакцияид| sharelock| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| транзакцияид| sharelock| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

ГИРИФТАНИ ҚУЛФҲО БО ТАЙПҲО АЗ QUERYID

Пурсиш

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

Мисол

| ГИРИФТАНИ ҚУЛФҲО БО ТАЙПҲОИ ҚУЛПП АЗ QUERYID +----------+--------------------+------ --------------+---------------------------------------+---- -+-------------------+------------ -------- | пид| locktype| режим| оғоз | queryid| blocking_pids| давомнокӣ +----------+-------------------------+----------- ---------+------------------------------+--------- ---+-------------------+----------------- --- | 11288| муносибат | RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| транзакцияид| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| муносибат | RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| муносибат | 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| транзакцияид| 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

Истифодаи таърихи басташавӣ ҳангоми таҳлили ҳодисаҳои иҷроиш.

Пурсиш бо queryid=389015618226997618, ки тавассути раванд бо pid=11288 иҷро шудааст, аз 2019-09-17 соати 10:00:00 3 дақиқа интизори қулф аст.
Қулф бо раванд бо pid = 11092 нигоҳ дошта шуд
Раванди бо pid=11092 иҷро кардани дархост бо queryid=389015618226997618 аз 2019-09-17 10:00:00 қуфлро барои 3 дақиқа нигоҳ дошт.

Натиҷа

Ҳоло, ман умедворам, чизи ҷолибтарин ва муфид оғоз хоҳад шуд - ҷамъоварии омор ва таҳлили парвандаҳо дар бораи таърихи интизориҳо ва басташавӣ.

Дар оянда, ман мехостам бовар кунам, ки шумо як маҷмӯи ёддоштҳоро хоҳед гирифт (монанд ба металинкаи Oracle).

Умуман, аз ин сабаб аст, ки методологияи истифодашуда барои шиносоӣ бо омма ҳарчи зудтар намоиш дода мешавад.

Дар ояндаи наздик ман кӯшиш мекунам лоиҳаро дар github гузорам.

Манбаъ: will.com

Яке аз усулҳои гирифтани таърихи қулф дар PostgreSQL

Маълумоти воридшавӣ

таърихи намоиши pg_locks

Натиҷа

ИНТИЗОРИИ ҚУЛФҲО БО ТАЙПҲО

ГИРИФТАНИ ҚУЛФҲО БО ТАЙПҲО

ИНТИЗОРИ Қулфҳо аз рӯи қуфлҳо аз ҷониби QUERYID

ГИРИФТАНИ ҚУЛФҲО БО ТАЙПҲО АЗ QUERYID

Натиҷа

Илова Эзоҳ Cancel ҷавоб