🥇Imodzi mwa njira zopezera mbiri ya loko mu PostgreSQL

Kupitiliza kwa nkhaniyo "Kuyesera kupanga analogue ya ASH ya PostgreSQL ".

Nkhaniyi iwunika ndikuwonetsa, pogwiritsa ntchito mafunso ndi zitsanzo, ndi chidziwitso chotani chomwe chingapezeke pogwiritsa ntchito mbiri ya pg_locks view.

Chenjezo.
Chifukwa cha zachilendo za mutuwo komanso nthawi yoyesera yosamalizidwa, nkhaniyi ikhoza kukhala ndi zolakwika. Kutsutsidwa ndi ndemanga zimalandiridwa kwambiri ndikuyembekezeredwa.

Lowetsani deta

Mbiri ya pg_locks kuyimira

archive_kutseka

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 
);

Kwenikweni, tebulo likufanana ndi tebulo archive_pg_stat_activity, yafotokozedwa mwatsatanetsatane apa - pg_stat_statements + pg_stat_activity + loq_query = pg_ash? ndi apa - Kuyesera kupanga analogue ya ASH ya PostgreSQL.

Kuti mudzaze ndime queryid ntchito imagwiritsidwa ntchito

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;

Kufotokozera: mtengo wa queryid column umasinthidwa mu history_locking table, ndiyeno pamene gawo latsopano lapangidwa pa tebulo la archive_locking, mtengowo udzasungidwa muzolemba zakale.

Zotsatira

Zambiri pamachitidwe ambiri.

KUDIKIRA MALOKO NDI MALOKO

Funsani

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

Chitsanzo:

| | KUDIKIRANI MALOKO NDI MA LOCKTYPES +---------------------------------- --------+ ------------------- | mtundu| mode| nthawi +----------------------------------------------- - ---------------------- | transactionid| ShareLock| 19:39:26 | tulo| AccessExclusiveLock| 00:03:35 +-------------------------------------------- -------+-----------

KUGWIRITSA ZINTHU MALOKO NDI LOCKTYPES

Funsani

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

Chitsanzo:

| | KUGWIRITSA ZINTHU MALOKO NDI MALOKO +--------------------------------------------- --------+------------------- | mtundu| mode| nthawi +----------------------------------------------- - ---------------------- | mgwirizano| RowExclusiveLock| 51:11:10 | virtualxid | ExclusiveLock| 48:10:43 | transactionid| ExclusiveLock| 44:24:53 | mgwirizano| AccessShareLock| 20:06:13 | tulo| AccessExclusiveLock| 17:58:47 | tulo| ExclusiveLock| 01:40:41 | mgwirizano| ShareUpdateExclusiveLock| 00:26:41 | chinthu| RowExclusiveLock| 00:00:01 | transactionid| ShareLock| 00:00:01 | kuwonjezera | ExclusiveLock| 00:00:01 +-------------------------------------------- -------+-----------

Tsatanetsatane wa zopempha za queryid

KUDIKIRA MALOKO PA MALOKO PA QUERYID

Funsani

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

Chitsanzo:

| | KUDIKIRA MALOKO NDI MA LOCKTYPES NDI QUERYID +----------+-----------+----- --------------- +-------------------------------- ----------------- - + pid| mtundu| mode| anayamba | funso| blocking_pids| nthawi +------------------------------------------------- -------------------------------------------------- --------------------------------------------------- --- | 11288 | transactionid| ShareLock| 2019-09-17 10:00:00.302936 | 389015618226997618| {11092} | 00:03:34 | 11626 | transactionid| ShareLock| 2019-09-17 10:00:21.380921 | 389015618226997618| {12380} | 00:00:29 | 11626 | transactionid| ShareLock| 2019-09-17 10:00:21.380921 | 389015618226997618| {11092} | 00:03:25 | 11626 | transactionid| ShareLock| 2019-09-17 10:00:21.380921 | 389015618226997618| {12213} | 00:01:55 | 11626 | transactionid| ShareLock| 2019-09-17 10:00:21.380921 | 389015618226997618| {12751} | 00:00:01 | 11629 | transactionid| ShareLock| 2019-09-17 10:00:24.331935 | 389015618226997618| {11092} | 00:03:22 | 11629 | transactionid| ShareLock| 2019-09-17 10:00:24.331935 | 389015618226997618| {12007} | 00:00:01 | 12007 | transactionid| ShareLock| 2019-09-17 10:05:03.327933 | 389015618226997618| {11629} | 00:00:13 | 12007 | transactionid| ShareLock| 2019-09-17 10:05:03.327933 | 389015618226997618| {11092} | 00:01:10 | 12007 | transactionid| ShareLock| 2019-09-17 10:05:03.327933 | 389015618226997618| {11288} | 00:00:05 | 12213 | transactionid| ShareLock| 2019-09-17 10:06:07.328019 | 389015618226997618| {12007} | 00:00:10

KUTENGA MALOKO PA MALOKO PA QUERYID

Funsani

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

Chitsanzo:

| | KUTENGA MA LOCKTYPES PA QUERYID +----------+-------------------------------------------------- --------------------------------- ----------------+ -------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | pid| mtundu| mode| anayamba | funso| blocking_pids| nthawi +------------------------------------------------- -------------------------------------------------- --------------------------------------------------- --- | 11288 | mgwirizano| 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 | mgwirizano| RowExclusiveLock| 2019-09-17 10:00:00.302936 | 389015618226997618| {}| 00:00:10 | 11092 | mgwirizano| 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 | tulo| AccessExclusiveLock| 2019-09-17 10:00:00.302936 | 389015618226997618| {11092} | 00:03:34

Kugwiritsa ntchito mbiri ya loko kusanthula zochitika zantchito.

Pempho lokhala ndi queryid=389015618226997618 lochitidwa ndi pid=11288 linali kuyembekezera kutsekereza kuyambira 2019-09-17 10:00:00 kwa mphindi zitatu.
Chotsekeracho chidachitika ndi pid=11092
Njira yokhala ndi pid=11092 yofunsira ndi queryid=389015618226997618 kuyambira 2019-09-17 10:00:00 idagwira loko kwa mphindi zitatu.

Zotsatira

Tsopano, ndikuyembekeza, gawo losangalatsa kwambiri komanso lothandiza lidzayamba - kusonkhanitsa ziwerengero ndi kusanthula milandu pa mbiri ya kuyembekezera ndi kutsekereza.

M'tsogolomu, ndikufuna kukhulupirira, tidzalandira zolemba zina (zofanana ndi Oracle's metalink).

Nthawi zambiri, ndichifukwa chake njira yomwe imagwiritsidwa ntchito imaperekedwa kwa aliyense mwachangu momwe angathere.

Ndiyesera kutumiza polojekitiyi pa github posachedwa.

Source: www.habr.com

Imodzi mwa njira zopezera mbiri ya loko mu PostgreSQL

Lowetsani deta

Mbiri ya pg_locks kuyimira

Zotsatira

KUDIKIRA MALOKO NDI MALOKO

KUGWIRITSA ZINTHU MALOKO NDI LOCKTYPES

KUDIKIRA MALOKO PA MALOKO PA QUERYID

KUTENGA MALOKO PA MALOKO PA QUERYID

Zotsatira

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