🥇Ose tasi o auala mo le mauaina o loka tala faasolopito i PostgreSQL

Fa'aauauina o le tusiga "Se taumafaiga e fatu se fa'atusa o le ASH mo PostgreSQL ".

O le tusiga o le a iloiloina ma faʻaalia i luga o fesili faʻapitoa ma faʻataʻitaʻiga mea aoga e mafai ona maua e faʻaaoga ai le pg_locks view history.

Lapataiga
Ona o le fou o le autu ma le le atoatoa o le taimi o suʻega, o le tusiga e ono i ai ni mea sese. O faitioga ma manatu e talia ma faamoemoeina.

Fa'amatalaga tu'u

pg_locks tala fa'atusa

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 
);

Ole mea masani, ole laulau e tutusa ma le laulau archive_pg_stat_activityfaʻamatalaina atili faʻamatalaga iinei - pg_stat_statements + pg_stat_activity + loq_query = pg_ash? ma iinei- Se taumafaiga e fatu se fa'atusa o le ASH mo PostgreSQL.

E faatumu se koluma queryid fa'aaogaina galuega

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;

Faamatalaga: o le tau o le koluma queryid e faʻafouina i le history_locking table, ona faʻatupuina lea o se vaeluaga fou mo le archive_locking table, o le tau o le a teuina i totonu o tala faʻasolopito.

Galuega Faatino

Fa'amatalaga lautele i fa'agasologa lautele.

FAATALI MO LOKA E LOCKTYPES

Suesuega

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

Faataitaiga:

| FAATALI MO LOKA E LOCKTYPES +---------------------+---------------------- --------------------------------------------- | ituaiga loka| faiga| umi +--------------------+--------------------- ---+-- ------------------- | transactionid| sea loka| 19:39:26 | tuple| AccessExclusiveLock| 00:03:35 +----------------------+---------------------- ----------------------+-------------------

TA'eina o loka e ala i LOCKTYPES

Suesuega

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

Faataitaiga:

| FA'ATA'INA O LOKA E FA'AVAE LOCKTYPES +--------------------------------------------- --------------------------------------------- | ituaiga loka| faiga| umi +--------------------+--------------------- ---+-- ------------------- | sootaga| RowExclusiveLock| 51:11:10 | virtualxid| Loka Fa'apitoa| 48:10:43 | transactionid| Loka Fa'apitoa| 44:24:53 | sootaga| AccessShareLock| 20:06:13 | tuple| AccessExclusiveLock| 17:58:47 | tuple| Loka Fa'apitoa| 01:40:41 | sootaga| ShareUpdateExclusiveLock| 00:26:41 | mea| RowExclusiveLock| 00:00:01 | transactionid| sea loka| 00:00:01 | fa'alautele| Loka Fa'apitoa| 00:00:01 +----------------------+---------------------- ----------------------+-------------------

Fa'amatalaga au'ili'ili mo fa'amatalaga fa'amatalaga fa'apitoa

FA'atali MO LOKA E LOCKTYPES E QUERYID

Suesuega

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

Faataitaiga:

| FAATALI MO LOKA E LOCKTYPES E QUERYID +----------+------------------------+----- --------------+--------------------------------+--- ----------------------------+----------------------- - --------- | pid| ituaiga loka| faiga| amata| queryid| poloka_pids| umi +----------+-----------------------+---------- -----------------------+--------------------------------+--------- ---+--------------------+----------------- --- | 11288| transactionid| loka fa'asoa| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| transactionid| loka fa'asoa| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| transactionid| loka fa'asoa| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| transactionid| loka fa'asoa| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| transactionid| loka fa'asoa| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| transactionid| loka fa'asoa| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| transactionid| loka fa'asoa| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| transactionid| loka fa'asoa| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| transactionid| loka fa'asoa| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| transactionid| loka fa'asoa| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| transactionid| loka fa'asoa| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

FAI LOKA I LOCKTYPES E QUERYID

Suesuega

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

Faataitaiga:

| FAI LOKA I LOCKTYPES E QUERYID +----------+------------------------+------ --------------+--------------------------------+---- -----------------------+------------ --------- | pid| ituaiga loka| faiga| amata| queryid| poloka_pids| umi +----------+-----------------------+---------- -----------------------+--------------------------------+--------- ---+--------------------+----------------- --- | 11288| sootaga| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| transactionid| Loka Fa'apitoa| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| sootaga| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| sootaga| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11092| virtualxid| Loka Fa'apitoa| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| virtualxid| Loka Fa'apitoa| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11288| transactionid| Loka Fa'apitoa| 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

Fa'aaogā le polokaina o tala fa'asolopito pe a su'esu'eina mea fa'atino.

O se fesili ma le queryid=389015618226997618 na faia e se faʻagasologa ma pid=11288 o loʻo faʻatali mo se loka talu mai le 2019-09-17 10:00:00 mo le 3 minute.
O le loka na taofia e se faagasologa ma pid=11092
O se fa'agasologa ma le pid=11092 fa'atino se fesili ma le queryid=389015618226997618 talu mai le 2019-09-17 10:00:00 na taofia le loka mo le 3 minute.

Le iʻuga

O lenei, ou te faʻamoemoe, o le a amata le mea e sili ona manaia ma aoga - aoina faʻamaumauga ma suʻesuʻeina mataupu i le talaʻaga o faʻamoemoega ma poloka.

I le lumanaʻi, ou te manaʻo e talitonu, o le ae mauaina se seti o se ituaiga o faʻamatalaga (e tutusa ma Oracle's metalink).

I se tulaga lautele, o le mafuaʻaga lea e faʻaalia vave ai le metotia faʻaaogaina mo le faʻasalalauga lautele.

I se taimi lata mai o le a ou taumafai e tuʻu le poloketi ile github.

puna: www.habr.com

O se tasi o metotia mo le mauaina o tala faʻasolopito i PostgreSQL

Fa'amatalaga tu'u

pg_locks tala fa'atusa

Galuega Faatino

FAATALI MO LOKA E LOCKTYPES

TA'eina o loka e ala i LOCKTYPES

FA'atali MO LOKA E LOCKTYPES E QUERYID

FAI LOKA I LOCKTYPES E QUERYID

Le iʻuga

Faaopoopo i ai se faamatalaga faalēaogāina tali