ProHoster > blog > Utawala > Mojawapo ya njia za kupata historia ya kufuli katika PostgreSQL

Mojawapo ya njia za kupata historia ya kufuli katika PostgreSQL

Muendelezo wa makala "Jaribio la kuunda analogi ya ASH kwa PostgreSQL ".

Nakala itachunguza na kuonyesha, kwa kutumia maswali na mifano maalum, ni habari gani muhimu inaweza kupatikana kwa kutumia historia ya mtazamo wa pg_locks.

Onyo
Kwa sababu ya riwaya ya mada na kipindi cha majaribio ambacho hakijakamilika, kifungu kinaweza kuwa na makosa. Ukosoaji na maoni yanakaribishwa sana na kutarajiwa.

Data ya kuingiza

Historia ya uwakilishi wa pg_locks

kuhifadhi_kufunga

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 
);

Kimsingi, meza ni sawa na meza archive_pg_stat_activity, imeelezwa kwa undani zaidi hapa - pg_stat_statements + pg_stat_activity + loq_query = pg_ash? na hapa - Jaribio la kuunda analogi ya ASH kwa PostgreSQL.

Ili kujaza safu swali kazi inatumika

sasisha_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;

Maelezo: thamani ya safu wima ya queryid inasasishwa katika jedwali_la_kufunga historia, na kisha kizigeu kipya kinapoundwa kwa ajili ya jedwali_la_kufungia kumbukumbu, thamani itahifadhiwa katika thamani za kihistoria.

Pato

Maelezo ya jumla juu ya michakato kwa ujumla.

KUSUBIRI KUFUNGWA KWA LOCKTYPES

Omba

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

Mfano

| KUSUBIRI KUFUNGWA KWA AINA ZA KUFUGI +--------------------------------- --------+ ------------------- | aina ya kufuli| hali| muda +--------------------------------------------- - --+-------------------- | muamala| ShirikiLock| 19:39:26 | tuple| AccessExclusiveLock| 00:03:35 +------------------+----------------------- - -------+-----------

KUCHUKUA KUFULI KWA AINA ZA KUFUNGA

Omba

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

Mfano

| KUCHUKUA KUFULI KWA AINA ZA KUFUTI +-------------------------------------------- --------+------------------- | aina ya kufuli| hali| muda +--------------------------------------------- - --+-------------------- | uhusiano| RowExclusiveLock| 51:11:10 | virtualxid| ExclusiveLock| 48:10:43 | muamala| ExclusiveLock| 44:24:53 | uhusiano| AccessShareLock| 20:06:13 | tuple| AccessExclusiveLock| 17:58:47 | tuple| ExclusiveLock| 01:40:41 | uhusiano| ShareUpdateExclusiveLock| 00:26:41 | kitu| RowExclusiveLock| 00:00:01 | muamala| ShirikiLock| 00:00:01 | kupanua| ExclusiveLock| 00:00:01 +------------------------------------------ - -------+-----------

Maelezo ya kina juu ya maombi maalum ya queryid

INASUBIRI KUFULI KWA AINA ZA KUFUNGA KWA QUERYID

Omba

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

Mfano

| KUSUBIRI KUFUNGWA KWA AINA ZA KUFUNGA KWA QUERYID +----------+----------+----- --------------- +--------------------------+--- ----------------- -+-------------------+----------- --------- | pid| aina ya kufuli| hali| imeanza| swali| blocking_pids| muda +----------------------------------------------- ---------+--------------------------------------- -------------------------------+----------------- --- | 11288| muamala| ShirikiLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| muamala| ShirikiLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| muamala| ShirikiLock| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| muamala| ShirikiLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| muamala| ShirikiLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| muamala| ShirikiLock| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| muamala| ShirikiLock| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| muamala| ShirikiLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| muamala| ShirikiLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| muamala| ShirikiLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| muamala| ShirikiLock| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

KUCHUKUA KUFUNGU KWA AINA ZA KUFUNGA KWA QUERYID

Omba

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

Mfano

| KUCHUKUA KUFULI KWA AINA ZA KUFUNGA KWA QUERYID +----------+---------------------------------------- --------------------------+---- ----------------+ -------------------+------------ -------- | pid| aina ya kufuli| hali| imeanza| swali| blocking_pids| muda +----------------------------------------------- ---------+--------------------------------------- -------------------------------+----------------- --- | 11288| uhusiano| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| muamala| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| uhusiano| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| uhusiano| 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| muamala| 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

Kutumia historia ya kufuli kuchanganua matukio ya utendakazi.

  1. Ombi lenye queryid=389015618226997618 lililotekelezwa kwa mchakato wa pid=11288 lilikuwa likingoja kuzuiwa kuanzia 2019-09-17 10:00:00 kwa dakika 3.
  2. Kufuli ilishikiliwa na mchakato wa pid=11092
  3. Mchakato ulio na pid=11092 kutekeleza ombi kwa queryid=389015618226997618 kuanzia 2019-09-17 10:00:00 ulishikilia kufuli kwa dakika 3.

Jumla ya

Sasa, natumaini, sehemu ya kuvutia zaidi na yenye manufaa itaanza - kukusanya takwimu na kuchambua kesi kwenye historia ya kusubiri na kuzuia.

Katika siku zijazo, nataka kuamini, tutapata seti ya vidokezo (sawa na metalink ya Oracle).

Kwa ujumla, ni kwa sababu hii kwamba mbinu inayotumiwa inapatikana kwa kila mtu haraka iwezekanavyo.

Nitajaribu kutuma mradi kwenye github katika siku za usoni.

Chanzo: mapenzi.com

Kuongeza maoni