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په PostgreSQL کې د لاک تاریخ ترلاسه کولو لپاره یو له میتودونو څخه

د مقالې دوام "د PostgreSQL لپاره د ASH انلاګ جوړولو هڅه ".

مقاله به معاینه کړي او وښیې ، د ځانګړو پوښتنو او مثالونو په کارولو سره ، کوم ګټور معلومات د pg_locks لید تاریخ په کارولو سره ترلاسه کیدی شي.

خبرداری
د موضوع د نوښت او د ازموینې نیمګړې دورې له امله، مقاله ممکن غلطۍ ولري. انتقاد او تبصرې په کلکه هرکلی او تمه کیږي.

د معلوماتو داخلول

د pg_locks نمایش تاریخ

archive_locking

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 
);

په اصل کې، میز د میز سره ورته دی آرشیف_pg_stat_activityپه تفصیل سره دلته تشریح شوي - pg_stat_statements + pg_stat_activity + loq_query = pg_ash؟ او دلته - د PostgreSQL لپاره د ASH انلاګ جوړولو هڅه.

د کالم ډکولو لپاره پوښتنه فعالیت کارول کیږي

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;

توضيح: د queryid کالم ارزښت په history_locking table کې تازه کیږي، او بیا کله چې د آرشیف_لاک کولو میز لپاره نوې برخه جوړه شي، ارزښت به په تاریخي ارزښتونو کې زیرمه شي.

محصول

په عمومي توګه د پروسو په اړه عمومي معلومات.

د لاک ټایپونو لخوا د لاکونو لپاره انتظار کول

غوښتنه

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

بېلګه:

| د لاک ټایپونو لخوا د لاکونو لپاره انتظار کول +------------------------------------------------------------------ ------------------- | locktype| حالت| موده +--------------------------------------------------------- --+---------| transactionid| شریکول| 19:39:26 | ټپل| Access ExclusiveLock| 00:03:35 +---------------------------------------------------------------- --------+------------

د لاک ټایپونو په واسطه د بندونو اخیستل

غوښتنه

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

بېلګه:

| د لاک ټایپونو په واسطه د تالاشۍ اخیستل +--------------------------------------------------------- --------+-------------------------------- | locktype| حالت| موده +--------------------------------------------------------- --+---------| اړیکه | RowExclusiveLock| 51:11:10 | virtualxid| ځانګړې لاک| 48:10:43 | transactionid| ځانګړې لاک| 44:24:53 | اړیکه | AccessShareLock| 20:06:13 | ټپل| Access ExclusiveLock| 17:58:47 | ټپل| ځانګړې لاک| 01:40:41 | اړیکه | ShareUpdateExclusiveLock| 00:26:41 | څيز| RowExclusiveLock| 00:00:01 | transactionid| شریکول| 00:00:01 | پراخول| ځانګړې لاک| 00:00:01 +-------------------------------------------------------------------------------- --------+------------

د ځانګړو پوښتنو غوښتنلیکونو په اړه تفصيلي معلومات

د QUERYID لخوا د لاک ټایپونو لخوا د لاکونو لپاره انتظار کول

غوښتنه

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

بېلګه:

| د کوریډ لخوا د لاک ټایپونو لخوا د لاکونو لپاره انتظار کول +---------+---------------------------------- +-------------------------------------------------------------------------------- ---------------------------------- --------- | pid| locktype| حالت| پیل شو | queryid| blocking_pids| موده +--------------------------------------------------------------- -------------------------------------------------------------- -------------------------------------------------------------- --- | 11288| transactionid| شریکول| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| transactionid| شریکول| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| transactionid| شریکول| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| transactionid| شریکول| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| transactionid| شریکول| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| transactionid| شریکول| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| transactionid| شریکول| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| transactionid| شریکول| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| transactionid| شریکول| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| transactionid| شریکول| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| transactionid| شریکول| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

د QUERYID لخوا د لاک ټایپونو لخوا د لاکونو اخیستل

غوښتنه

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

بېلګه:

| د کوریډ لخوا د لاک ټایپس لخوا د لاکونو اخیستل +------------+---------------------------------------- ---------------------------------------------------------------------------- --------+------------------------- -------- | pid| locktype| حالت| پیل شو | queryid| blocking_pids| موده +----------------------------------------------- --------------------------------------------------------------- -------------------------------------------------------------- --- | 11288| اړیکه | RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| transactionid| ځانګړی لاک| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| اړیکه | RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| اړیکه | RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11092| virtualxid| ځانګړی لاک| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| virtualxid| ځانګړی لاک| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| transactionid| ځانګړی لاک| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| ټپل| Access ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34

د فعالیت پیښو تحلیل کولو لپاره د لاک تاریخ کارول.

  1. د queryid=389015618226997618 سره یوه غوښتنه د pid=11288 سره د پروسې لخوا اجرا شوې د 2019 دقیقو لپاره د 09-17-10 00:00:3 څخه د بلاک کولو په تمه وه.
  2. قلف د pid = 11092 سره د پروسې لخوا نیول شوی و
  3. د pid=11092 سره یوه پروسه چې د queryid=389015618226997618 سره د غوښتنې اجرا کول د 2019-09-17 10:00:00 څخه پیل کیږي د 3 دقیقو لپاره تالا ساتل کیږي.

نتیجه

اوس، زه امید لرم، ترټولو په زړه پورې او ګټوره برخه به پیل شي - د احصایو راټولول او د انتظار او بلاک کولو تاریخ کې قضیې تحلیل کول.

په راتلونکي کې ، زه غواړم باور وکړم ، موږ به د ځینې نوټونو سیټ ترلاسه کړو (د اوریکل میټلینک ته ورته).

په عموم کې، دا د دې دلیل لپاره دی چې کارول شوي میتودولوژي هرڅومره ژر چې امکان ولري چمتو کیږي.

زه به هڅه وکړم په نږدې راتلونکي کې پروژه په ګیتوب کې پوسټ کړم.

سرچینه: www.habr.com

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