🥇 PostgreSQL ۾ لاڪ هسٽري حاصل ڪرڻ جو هڪ طريقو

مضمون جو تسلسل "PostgreSQL لاءِ ASH اينالاگ ٺاهڻ جي ڪوشش ".

مضمون جانچيندو ۽ ڏيکاريندو، مخصوص سوالن ۽ مثالن کي استعمال ڪندي، pg_locks ڏيک جي تاريخ استعمال ڪندي ڪھڙي مفيد معلومات حاصل ڪري سگھجي ٿي.

ڊيڄاريندڙ.
موضوع جي نواڻ ۽ نامڪمل جاچ واري دور جي ڪري، مضمون ۾ غلطيون ٿي سگهن ٿيون. تنقيد ۽ تبصرا سخت استقبال ۽ توقع آهن.

ان پٽ ڊيٽا

pg_locks جي نمائندگي جي تاريخ

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 
);

لازمي طور تي، ٽيبل جي برابر آهي archive_pg_stat_activityهتي وڌيڪ تفصيل سان بيان ڪيو ويو آهي - pg_stat_statements + pg_stat_activity + loq_query = pg_ash؟ ۽ هتي - PostgreSQL لاءِ ASH جو هڪ اينالاگ ٺاهڻ جي ڪوشش.

ڪالم ڀرڻ لاءِ سوال فنڪشن استعمال ڪيو ويندو آهي

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;

وضاحت: queryid ڪالمن جي قيمت history_locking ٽيبل ۾ اپڊيٽ ڪئي ويندي آهي، ۽ پوءِ جڏهن archive_locking ٽيبل لاءِ نئون ورهاڱو ٺاهيو ويندو، ته قيمت تاريخي قدرن ۾ محفوظ ڪئي ويندي.

ٻاھر

عام طور تي عملن تي عام معلومات.

لاڪ ٽائيپ ذريعي لاڪ جي انتظار ۾

عرض ڪيو

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

مثال طور

| لاڪ ٽائپس پاران لاڪ جي انتظار ۾ +------------------------- +------------------------------- ------------------- | locktype| موڊ| مدت +-------------------------------------------- --+---------| transactionid| شيئر لاڪ | 19:39:26 | ٽوپل| AccessExclusiveLock| 00:03:35 +--------------------------------------------------------- -------- +------------

لاڪ ٽائيپ ذريعي لاڪ وٺڻ

عرض ڪيو

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

مثال طور

| لاڪ ٽائيپ ذريعي لاڪ وٺڻ +-------------------------------------------- --------+-------------------------------- | locktype| موڊ| مدت +-------------------------------------------- --+---------| تعلق | RowExclusiveLock| 51:11:10 | virtualxid| ExclusiveLock| 48:10:43 | transactionid| ExclusiveLock| 44:24:53 | تعلق | AccessShareLock| 20:06:13 | ٽوپل| AccessExclusiveLock| 17:58:47 | ٽوپل| ExclusiveLock| 01:40:41 | تعلق | ShareUpdateExclusiveLock| 00:26:41 | اعتراض| RowExclusiveLock| 00:00:01 | transactionid| شيئر لاڪ | 00:00:01 | وڌايو| ExclusiveLock| 00:00:01 +--------------------------------------------------------- -------- +------------

مخصوص سوالن جي درخواستن تي تفصيلي ڄاڻ

QUERYID پاران لاڪ ٽائپس پاران لاڪ لاء انتظار ڪريو

عرض ڪيو

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

مثال طور

| QUERYID پاران لاڪ ٽائپس پاران لاڪ جي انتظار ۾ +--------- +------------ +--------------- +------------------------------------------------------------------------- ------------------------- +------------------------------- | pid| locktype| موڊ| شروع ڪيو | queryid| blocking_pids| عرصو +--------- +------------------------- + --------- +---------------------------- +--------- ------------------------- +----------------------------------------- --- | 11288| transactionid| شيئر لاڪ | 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| transactionid| شيئر لاڪ | 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| transactionid| شيئر لاڪ | 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| transactionid| شيئر لاڪ | 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| transactionid| شيئر لاڪ | 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| transactionid| شيئر لاڪ | 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| transactionid| شيئر لاڪ | 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| transactionid| شيئر لاڪ | 2019-09-17 10:05:03.327933| 389015618226997618| {11629} 00:00:13 | 12007| transactionid| شيئر لاڪ | 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| transactionid| شيئر لاڪ | 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| transactionid| شيئر لاڪ | 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

QUERYID پاران لاڪ ٽائپس ذريعي لاڪ کڻڻ

عرض ڪيو

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

مثال طور

| لاڪ ٽائپس ذريعي ڪائيريڊ +------------ +------------ +------------------------------- ----------------------------------------- +------------------------- ----------- +------------------------- -------- | pid| locktype| موڊ| شروع ڪيو | queryid| blocking_pids| عرصو +--------- +------------------------- + --------- +---------------------------- +--------- ------------------------- +----------------------------------------- --- | 11288| تعلق | RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| transactionid| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| تعلق | RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| تعلق | 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| transactionid| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| ٽوپل| AccessExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34

ڪارڪردگي جي واقعن جو تجزيو ڪرڻ لاءِ تالا جي تاريخ استعمال ڪندي.

queryid=389015618226997618 سان گڏ هڪ درخواست pid=11288 سان عمل ڪندي 2019-09-17 10:00:00 کان 3 منٽن تائين بلاڪ ٿيڻ جي انتظار ۾ هئي.
تالا هڪ عمل سان منعقد ڪيو ويو pid = 11092
هڪ عمل pid=11092 سان هڪ درخواست تي عمل ڪندي queryid=389015618226997618 2019-09-17 10:00:00 کان شروع ٿيندي 3 منٽن لاءِ تالا رکيا.

نتيجو

هاڻي، مون کي اميد آهي ته، سڀ کان وڌيڪ دلچسپ ۽ مفيد حصو شروع ٿيندو - انگ اکر گڏ ڪرڻ ۽ انتظار ۽ بلاڪ جي تاريخ تي ڪيسن جو تجزيو.

مستقبل ۾، مان يقين ڪرڻ چاهيان ٿو، اسان ڪجهه نوٽس جو هڪ سيٽ حاصل ڪنداسين (Oracle’s metalink وانگر).

عام طور تي، اهو ئي سبب آهي ته اهو طريقو استعمال ڪيو ويو آهي هر ڪنهن کي جلدي ممڪن طور تي دستياب آهي.

آئون ويجهي مستقبل ۾ گٿب تي پروجيڪٽ پوسٽ ڪرڻ جي ڪوشش ڪندس.

جو ذريعو: www.habr.com

PostgreSQL ۾ تالا جي تاريخ حاصل ڪرڻ جو هڪ طريقو

ان پٽ ڊيٽا

pg_locks جي نمائندگي جي تاريخ

ٻاھر

لاڪ ٽائيپ ذريعي لاڪ جي انتظار ۾

لاڪ ٽائيپ ذريعي لاڪ وٺڻ

QUERYID پاران لاڪ ٽائپس پاران لاڪ لاء انتظار ڪريو

QUERYID پاران لاڪ ٽائپس ذريعي لاڪ کڻڻ

نتيجو

تبصرو شامل ڪريو جواب منسوخ