🥇Yek ji awayên bidestxistina dîroka qefilandinê di PostgreSQL

Berdewama gotara ”Hewldanek ji bo afirandina analogek ASH ji bo PostgreSQL ".

Gotar dê bi karanîna pirs û nimûneyên taybetî vekolîne û nîşan bide ku bi karanîna dîroka dîtina pg_locks çi agahdariya kêrhatî dikare were bidestxistin.

Hişyariyê
Ji ber nûbûna mijarê û heyama ceribandinê ya neqediyayî, dibe ku gotar xeletiyan bike. Rexne û şîrove bi tundî tê pêşwazîkirin û hêvîkirin.

Daneyên têketinê

Dîroka nûneriya pg_locks

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 
);

Di eslê xwe de, tablo dişibe tabloyê archive_pg_stat_activity, bi hûrgulî li vir hatî şirove kirin - pg_stat_statements + pg_stat_activity + loq_query = pg_ash? û li vir - Hewldanek ji bo afirandina analogek ASH ji bo PostgreSQL.

Ji bo dagirtina stûnek queryid fonksiyon tê bikaranîn

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;

Daxûyanî: nirxa stûna queryid di tabloya history_locking de tê nûve kirin, û dûv re dema ku dabeşek nû ji bo tabloya archive_locking were afirandin, nirx dê di nirxên dîrokî de were hilanîn.

Karûabr

Agahdariya gelemperî li ser pêvajoyên gelemperî.

LI BER LOCKTYPES LI BENDA LOCKYAN

Daxwaz kirin

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

Nimûne:

| LI BER LOCKTÎPÊN LI HERÎ LI LI BENDÊ KIRIN +-----------+------------------------------- ------------------- | locktype| mode| demdirêj +---------------------------------------------- --+-------------------- | danûstandin| ShareLock| 19:39:26 | qasê| AccessExclusiveLock| 00:03:35 +------------------------------------------- -------+----------

LI SER LOCKTYPÊN KIRINÊN LOCK

Daxwaz kirin

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

Nimûne:

| LI SER LOCKTÎPÊN GIRTINÊN kilît +-------------------+---------------------- --------+------------------- | locktype| mode| demdirêj +---------------------------------------------- --+-------------------- | têkilî| RowExclusiveLock| 51:11:10 | virtualxid| ExclusiveLock| 48:10:43 | danûstandin| ExclusiveLock| 44:24:53 | têkilî| AccessShareLock| 20:06:13 | qat| AccessExclusiveLock| 17:58:47 | qasê| ExclusiveLock| 01:40:41 | têkilî| ShareUpdateExclusiveLock| 00:26:41 | objekt| RowExclusiveLock| 00:00:01 | danûstandin| ShareLock| 00:00:01 | dirêjkirin| ExclusiveLock| 00:00:01 +------------------------------------------- -------+----------

Agahiyên berfireh li ser daxwazên queryid yên taybetî

LI BENDA LOCKTÎPÊN BI QUERYID LI BENDA LOCKYÊN

Daxwaz kirin

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

Nimûne:

| LI BER LOCKTYPÊN LI BER QUERYID LI HERÎ KIRIN +---------+------------------------------- +------------------------------------------------------ -+--------------------+----------- --------- | pid| locktype| mode| dest pê kir| queryid| blocking_pids| demdirêj +----------+------------------------------------ ---------+--------------------------------------- ------------------------------------------------ --- | 11288| danûstandin| ShareLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| danûstandin| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| danûstandin| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| danûstandin| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| danûstandin| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| danûstandin| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| danûstandin| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| danûstandin| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| danûstandin| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| danûstandin| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| danûstandin| ShareLock| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

LI SER LOCKTYPAN BI QUERYID KILINDIN

Daxwaz kirin

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

Nimûne:

| GIRTIN LOCK BI LOCKTYPAN BI QUERYID +----------+----------+--------------------+ ------------------------------------------------- --------------------------------- -------- | pid| locktype| mode| dest pê kir| queryid| blocking_pids| demdirêj +----------+------------------------------------ ---------+--------------------------------------- ------------------------------------------------ --- | 11288| têkilî| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| danûstandin| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| têkilî| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| têkilî| 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| danûstandin| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| qasê| AccessExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34

Bikaranîna dîroka kilîtkirinê ji bo analîzkirina bûyerên performansê.

Daxwazek bi queryid=389015618226997618 ku ji hêla pêvajoyek bi pid=11288 ve hatî pêkanîn, ji 2019-09-17 10:00:00 ve ji bo 3 hûrdeman li benda astengkirinê bû.
Girtî bi pêvajoyek bi pid=11092 ve hate girtin
Pêvajoyek bi pid=11092 ku daxwazek bi queryid=389015618226997618 pêk tîne ku ji 2019-09-17 10:00:00 dest pê dike 3 hûrdem girt.

Encam

Naha, ez hêvî dikim, beşa herî balkêş û kêrhatî dê dest pê bike - berhevkirina statîstîkan û analîzkirina dozên li ser dîroka bendewarî û astengkirinê.

Di paşerojê de, ez dixwazim bawer bikim, em ê komek hin notan bistînin (mîna metallinka Oracle).

Bi gelemperî, ji ber vê yekê ye ku metodolojiya ku tê bikar anîn bi zûtirîn dem ji her kesî re tê peyda kirin.

Ez ê hewl bidim ku di demek nêzîk de projeyê li ser github bişînim.

Source: www.habr.com

Yek ji rêbazên ji bo bidestxistina dîroka qefilandinê di PostgreSQL de

Daneyên têketinê

Dîroka nûneriya pg_locks

Karûabr

LI BER LOCKTYPES LI BENDA LOCKYAN

LI SER LOCKTYPÊN KIRINÊN LOCK

LI BENDA LOCKTÎPÊN BI QUERYID LI BENDA LOCKYÊN

LI SER LOCKTYPAN BI QUERYID KILINDIN

Encam

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