🥇Salah sawijining cara kanggo entuk riwayat kunci ing PostgreSQL

Lanjutan saka artikel "Coba nggawe analog ASH kanggo PostgreSQL ".

Artikel kasebut bakal nliti lan nuduhake, nggunakake pitakon lan conto tartamtu, informasi migunani apa sing bisa dipikolehi nggunakake riwayat tampilan pg_locks.

Piweling
Amarga topik anyar lan periode tes sing durung rampung, artikel kasebut bisa uga ana kesalahan. Kritik lan komentar banget ditampani lan dikarepake.

Input data

Sajarah perwakilan 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 
);

Ateges, meja padha karo meja archive_pg_stat_activity, diterangake luwih rinci ing kene - pg_stat_statements + pg_stat_activity + loq_query = pg_ash? lan kene- Usaha kanggo nggawe analog saka ASH kanggo PostgreSQL.

Kanggo ngisi kolom queryid fungsi digunakake

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;

Panjelasan: Nilai kolom queryid dianyari ing tabel history_locking, banjur nalika partisi anyar digawe kanggo tabel archive_locking, Nilai bakal disimpen ing nilai sajarah.

Output

Informasi umum babagan proses umum.

Nunggu LOCKS BY LOCKTYPES

Panjaluk

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:

| Nunggu LOCKS BY LOCKTYPES
+------------------------------------------ ---+-------------------
| jinis kunci | modus| suwene
+------------------------------------------ ---+-------------------
| transaksiid| ShareLock| 19:39:26
| tuwung| AccessExclusiveLock| 00:03:35
+------------------------------------------ ---+-------------------

PENGGUNAAN KUNCI BY LOCKTYPES

Panjaluk

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:

| PENGGUNAAN KUNCI BY LOCKTYPES
+------------------------------------------ ---+-------------------
| jinis kunci | modus| suwene
+------------------------------------------ ---+-------------------
| hubungane | RowExclusiveLock| 51:11:10
| virtualxid| Kunci Eksklusif| 48:10:43
| transaksiid| Kunci Eksklusif| 44:24:53
| hubungane | AccessShareLock| 20:06:13
| tuwung| AccessExclusiveLock| 17:58:47
| tuwung| Kunci Eksklusif| 01:40:41
| hubungane | ShareUpdateExclusiveLock| 00:26:41
| obyek | RowExclusiveLock| 00:00:01
| transaksiid| ShareLock| 00:00:01
| ngluwihi | Kunci Eksklusif| 00:00:01
+------------------------------------------ ---+-------------------

Informasi rinci babagan panjalukan queryid tartamtu

Nunggu LOCKS BY LOCKTYPES BY QUERYID

Panjaluk

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:

| Nunggu LOCKS BY LOCKTYPES BY QUERYID
+----------+---------+------------------+------ -------------------------------------------+------- ---------------------------+-------
| pid| jinis kunci | modus| wiwit | pitakon | blocking_pids| suwene
+----------+---------+------------------+------ -------------------------------------------+------- ---------------------------+-------
| 11288| transaksiid| ShareLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34
| 11626| transaksiid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29
| 11626| transaksiid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25
| 11626| transaksiid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55
| 11626| transaksiid| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01
| 11629| transaksiid| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22
| 11629| transaksiid| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01
| 12007| transaksiid| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13
| 12007| transaksiid| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10
| 12007| transaksiid| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05
| 12213| transaksiid| ShareLock| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

NANGGO KUNCI BY LOCKTYPES BY QUERYID

Panjaluk

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:

| NANGGO KUNCI BY LOCKTYPES BY QUERYID
+----------+---------+------------------+------ -------------------------------------------+------- --------------------------+-------
| pid| jinis kunci | modus| wiwit | pitakon | blocking_pids| suwene
+----------+---------+------------------+------ -------------------------------------------+------- --------------------------+-------
| 11288| hubungane | RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34
| 11092| transaksiid| Kunci Eksklusif| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34
| 11288| hubungane | RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10
| 11092| hubungane | RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34
| 11092| virtualxid| Kunci Eksklusif| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34
| 11288| virtualxid| Kunci Eksklusif| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34
| 11288| transaksiid| Kunci Eksklusif| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34
| 11288| tuwung| AccessExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34

Nggunakake riwayat kunci kanggo nganalisa kedadeyan kinerja.

Panjaluk karo queryid=389015618226997618 ditindakake kanthi proses kanthi pid=11288 ngenteni pamblokiran wiwit 2019-09-17 10:00:00 suwene 3 menit.
Kunci kasebut ditindakake kanthi proses kanthi pid=11092
Proses kanthi pid=11092 nglakokake panjalukan kanthi queryid=389015618226997618 wiwit 2019-09-17 10:00:00 nyekel kunci sajrone 3 menit.

Asile

Saiki, muga-muga, bagean sing paling menarik lan migunani bakal diwiwiti - ngumpulake statistik lan nganalisa kasus babagan sejarah ngenteni lan pamblokiran.

Ing mangsa ngarep, aku pengin pracaya, kita bakal entuk set sawetara cathetan (padha karo metalink Oracle).

Umumé, amarga metodologi sing digunakake kasedhiya kanggo kabeh wong kanthi cepet.

Aku bakal nyoba ngirim proyek ing github ing mangsa ngarep.

Source: www.habr.com

Salah sawijining cara kanggo njupuk riwayat kunci ing PostgreSQL

Input data

Sajarah perwakilan pg_locks

Output

Nunggu LOCKS BY LOCKTYPES

PENGGUNAAN KUNCI BY LOCKTYPES

Nunggu LOCKS BY LOCKTYPES BY QUERYID

NANGGO KUNCI BY LOCKTYPES BY QUERYID

Asile

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