🥇Salah sahiji metode pikeun meunangkeun sajarah konci dina PostgreSQL

Sambungan artikel "Usaha pikeun nyieun analog ASH pikeun PostgreSQL ".

Artikel bakal nalungtik tur némbongkeun, ngagunakeun queries husus sarta conto, naon informasi mangpaat bisa diala ngagunakeun sajarah view pg_locks.

Perhatosan.
Kusabab kabaruan topik sareng periode tés anu teu acan réngsé, tulisan éta tiasa ngandung kasalahan. Kritik sareng komentar ditampi pisan sareng dipiharep.

Input data

Sajarah ngagambarkeun 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 
);

Intina, méja sami sareng méja archive_pg_stat_activity, dijelaskeun leuwih jéntré di dieu - pg_stat_statements + pg_stat_activity + loq_query = pg_ash? sareng di dieu- Usaha pikeun nyieun analog ASH pikeun PostgreSQL.

Pikeun ngeusian kolom queryid fungsi dipaké

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;

Katerangan: nilai kolom queryid diropéa dina tabel history_locking, lajeng nalika partisi anyar dijieun pikeun tabel archive_locking, nilai bakal disimpen dina nilai sajarah.

Kaluaran

Inpormasi umum ngeunaan prosés sacara umum.

Nungguan konci ku LOCKTYPES

Kahoyong

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

conto

| Nungguan konci ku LOCKTYPES
+------------------------------------------- -----------------------
| locktype| modeu| lilana
+------------------------------------------- -----------------------
| transactionid| ShareLock| 19:39:26
| tupel| AccessExclusiveLock| 00:03:35
+------------------------------------------- -------------------------

Nyokot konci ku LOCKTYPES

Kahoyong

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

conto

| Nyokot konci ku LOCKTYPES
+------------------------------------------- -------------------------
| locktype| modeu| lilana
+------------------------------------------- -------------------------
| hubungan| RowExclusiveLock| 51:11:10
| virtualxid| ExclusiveLock| 48:10:43
| transactionid| ExclusiveLock| 44:24:53
| hubungan| AccessShareLock| 20:06:13
| tulak| AccessExclusiveLock| 17:58:47
| tulak| ExclusiveLock| 01:40:41
| hubungan| ShareUpdateExclusiveLock| 00:26:41
| objék| RowExclusiveLock| 00:00:01
| transactionid| ShareLock| 00:00:01
| ngalegaan| ExclusiveLock| 00:00:01
+------------------------------------------- -----------------------

Inpo wincik dina requests queryid husus

Nungguan konci ku LOCKTYPES ku QUERYID

Kahoyong

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

conto

| Nungguan konci ku LOCKTYPES ku QUERYID
+----------+---------+------------ --------+------ -----------------------+--------- -----------+------- ---------------------------+--------
| pid| locktype| modeu| dimimitian| queryid| blocking_pids| lilana
+----------+---------+------------ --------+------ -----------------------+--------- -----------+------- ---------------------------+--------
| 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

Nyandak konci ku LOCKTYPES ku QUERYID

Kahoyong

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

conto

| Nyandak konci ku LOCKTYPES ku QUERYID
+----------+---------+------------ --------+------ -----------------------+--------- -----------+------- ---------------------------+--------
| pid| locktype| modeu| dimimitian| queryid| blocking_pids| lilana
+----------+---------+------------ --------+------ -----------------------+--------- -----------+------- ---------------------------+--------
| 11288| hubungan| 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| hubungan| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10
| 11092| hubungan| 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| tupel| AccessExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34

Ngagunakeun sajarah konci pikeun nganalisis insiden kinerja.

Paménta kalayan queryid = 389015618226997618 dieksekusi ku prosés kalayan pid = 11288 ngantosan blokiran mimitian ti 2019-09-17 10:00:00 salami 3 menit.
Koncina dilaksanakeun ku prosés kalayan pid=11092
Prosés kalawan pid = 11092 executing pamundut kalawan queryid = 389015618226997618 mimitian ti 2019-09-17 10:00:00 nahan konci pikeun 3 menit.

hasil

Ayeuna, kuring ngarepkeun, bagian anu paling pikaresepeun sareng mangpaat bakal ngamimitian - ngumpulkeun statistik sareng nganalisa kasus dina sajarah ngantosan sareng blocking.

Dina mangsa nu bakal datang, abdi hoyong percanten, urang bakal meunang susunan sababaraha catetan (sarupa metalink Oracle urang).

Sacara umum, alesan ieu yén metodologi anu dianggo disayogikeun ka sadayana gancang-gancang.

Kuring bakal nyobian masangkeun proyék dina github dina mangsa nu bakal datang.

sumber: www.habr.com

Salah sahiji metodeu pikeun meunangkeun sajarah konci dina PostgreSQL

Input data

Sajarah ngagambarkeun pg_locks

Kaluaran

Nungguan konci ku LOCKTYPES

Nyokot konci ku LOCKTYPES

Nungguan konci ku LOCKTYPES ku QUERYID

Nyandak konci ku LOCKTYPES ku QUERYID

hasil

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