🥇 Una methodorum ad historiam seram obtinendam in PostgreSQL

Continuatio articuli "Conatum ad creandum analogum ASH pro PostgreSQL ".

Articulus examinabit et ostendet, certis quaestionibus et exemplis adhibitis, quid notitiae utiles haberi possint utens historia pg_locks intuitu.

Admonitio.
Ob novitatem argumenti et periodi probationis imperfectam, articulus errores continere potest. Criticae et commentationes valde gratae et expectatae sunt.

Input data

Historia pg_locks representation

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 
);

Mensa essentialiter est similis mensae archive_pg_stat_activityhic fusius descriptus - pg_stat_statements + pg_stat_activity + loq_query = pg_ash ? et hic - Conatus analogum ASH pro PostgreSQL creare.

Implere agmen queryid munus adhibetur

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;

explicandum: valor columnae queryid renovatur in tabula historiae_ densis, et tunc cum nova partitio pro tabula scrinium claudenda creata est, valor in valoribus historicis reponendus est.

output

Informationes generales de processibus in genere.

EXSPECTATIO crines LOCKTYPES

inquisitionis

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

exempli gratia

| EXSPECTATIO CAESARIES PER LOCKTYPES +-----------+---------------------------------------+ ------------------- | locktype| mode| diuturnitas +------------------+------------------------------------------------ --+------------------ | transactionid | ShareLock| 19:39:26 | tuple| AccessExclusiveLock| 00:03:35 +--------------------+-------------------------------- -------+----------

Takings crines LOCKTYPES

inquisitionis

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

exempli gratia

| Captivi COMES PER LOCKTYPES +----------------------------------+----------------------- ---------+------------------ | locktype| mode| diuturnitas +------------------+------------------------------------------------ --+------------------ | relation| RowExclusiveLock| 51:11:10 | virtualxid| ExclusiveLock| 48:10:43 | transactionid | ExclusiveLock| 44:24:53 | relation| AccessShareLock| 20:06:13 | tuple| AccessExclusiveLock| 17:58:47 | tuple| ExclusiveLock| 01:40:41 | relation| ShareUpdateExclusiveLock| 00:26:41 | object| RowExclusiveLock| 00:00:01 | transactionid | ShareLock| 00:00:01 | extend| ExclusiveLock| 00:00:01 +--------------------+-------------------------------- -------+----------

Detailed notitia super specifica petitiones queryid

EXSPECTATIO crines per locktypes by QUERYID

inquisitionis

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

exempli gratia

| EXSPECTATIO crines per locktypes per QUERYID +----------+----------+----- --------------- +----------------------------+--- ----------------- -+------------------+----------- --------- | pid| locktype| mode| coepi | queryid| blocking_pids| diuturnitas +----------+--------------------------------+----------- ---------+------------------------------+--------- -----------+---------------------+----------------- --- | 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

Captivi comas per Locktypes per QUERYID

inquisitionis

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

exempli gratia

| ACCIPIENDIS COMA PER LOCORUM QUERYID +----------+----------+------ --------------+ -------------------------------+---- -----------------+ ----------------------+------------ -------- | pid| locktype| mode| coepi | queryid| blocking_pids| diuturnitas +----------+--------------------------------+----------- ---------+------------------------------+--------- -----------+---------------------+----------------- --- | 11288| relation| 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| relation| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| relation| 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| tuple| AccessExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34

Utens historia cincinno ad incidentes resolvere effectus.

Exhibitio cum queryid=389015618226997618 exsecuta est per processum cum pid=11288 exspectabat interclusio initium ab 2019-09-17 10:00:00 pro 3 minutis.
Sera tenebatur per processum cum pid=11092
Processus cum pid=11092 rogationem exsequens cum queryid=389015618226997618 incipiens ab 2019-09-17 10:00:00 lock pro 3 minutis tenuit.

exitum

Nunc, ut spero, pars maxima interesting et utilissima incipiet - statistica et analysing causas colligendi in historia exspectationum et impedimentorum.

In posterum, ut credere volo, copia notarum aliquarum (similis metalink Oraculi).

In universum ideo methodus adhibita omnibus quam celerrime praesto est.

Conabor post project in github in proximo futuro.

Source: www.habr.com

Una methodorum ad historiam seram obtinendam in PostgreSQL

Input data

Historia pg_locks representation

output

EXSPECTATIO crines LOCKTYPES

Takings crines LOCKTYPES

EXSPECTATIO crines per locktypes by QUERYID

Captivi comas per Locktypes per QUERYID

exitum

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