🥇Usa sa mga pamaagi sa pagkuha sa kasaysayan sa lock sa PostgreSQL

Pagpadayon sa artikulo "Usa ka pagsulay sa paghimo og ASH analogue alang sa PostgreSQL ".

Susihon ug ipakita sa artikulo, gamit ang piho nga mga pangutana ug pananglitan, kung unsang mapuslanon nga kasayuran ang makuha gamit ang kasaysayan sa pagtan-aw sa pg_locks.

Pasidaan
Tungod sa kabag-ohan sa hilisgutan ug sa wala pa nahuman nga panahon sa pagsulay, ang artikulo mahimong adunay mga sayup. Ang pagsaway ug mga komento kusganong gidawat ug gipaabot.

Input data

Kasaysayan sa representasyon sa 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 
);

Sa tinuud, ang lamesa parehas sa lamesa archive_pg_stat_activity, gihulagway sa mas detalyado dinhi - pg_stat_statements + pg_stat_activity + loq_query = pg_ash? ug dinhi- Usa ka pagsulay sa paghimo og analogue sa ASH para sa PostgreSQL.

Aron pun-on ang usa ka kolum pangutana gigamit ang function

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;

Pagpatin-aw: ang bili sa kolum sa queryid gi-update sa history_locking table, ug unya sa diha nga ang usa ka bag-ong partition gihimo para sa archive_locking table, ang bili itago sa historical values.

Paggawas

Kinatibuk-ang impormasyon sa mga proseso sa kinatibuk-an.

NAGHULAT SA MGA LOCK PINAAGI SA MGA LOCKTYPES

Paghangyo

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

Pananglitan:

| NAGHULAT SA MGA LOCKS BY LOCKTYPES +------------+---------- ---------+ ------------------- | locktype| mode| gidugayon +---------------------+-------------------------------------- - ----------------------------------- | transactionid| ShareLock| 19:39:26 | tupol| AccessExclusiveLock| 00:03:35 +----------------------+----------------------- - -------+----------

PAGKUHA SA MGA LOCK PINAAGI SA LOCKTYPES

Paghangyo

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

Pananglitan:

| PAGKUHA SA MGA LOCKS PINAAGI SA LOCKTYPES +----------------------------------------------- --------------------------------------------- | locktype| mode| gidugayon +---------------------+-------------------------------------- - ----------------------------------- | relasyon| RowExclusiveLock| 51:11:10 | virtualxid| ExclusiveLock| 48:10:43 | transactionid| ExclusiveLock| 44:24:53 | relasyon| AccessShareLock| 20:06:13 | tupol| AccessExclusiveLock| 17:58:47 | tupol| ExclusiveLock| 01:40:41 | relasyon| ShareUpdateExclusiveLock| 00:26:41 | butang| RowExclusiveLock| 00:00:01 | transactionid| ShareLock| 00:00:01 | ipalawig| ExclusiveLock| 00:00:01 +----------------------+---------------------- - -------+----------

Detalyadong impormasyon sa piho nga mga hangyo sa queryid

NAGHULAT SA MGA LOCK PINAAGI SA MGA LOCKTYPES NI QUERYID

Paghangyo

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

Pananglitan:

| NAGHULAT SA MGA LOCK PINAAGI SA MGA LOCKTYPES NI QUERYID +----------+----------+----- --------------- +----------------------------+-------------------- -----------------------+----------- --------- | pid| locktype| mode| nagsugod| queryid| blocking_pids| gidugayon +-----------+------------------------+----------- ----------+--------------------------------+--------- --------------------------+---------------------+----------------- --- | 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

PAGKUHA SA MGA LOCK PINAAGI SA LOCKTYPES PINAAGI SA QUERYID

Paghangyo

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

Pananglitan:

| PAGKUHA SA MGA LOCK PINAAGI SA LOCKTYPES PINAAGI SA QUERYID +----------+-----------+------ --------------+ ------------------------------------- ---------------------------------- --------- | pid| locktype| mode| nagsugod| queryid| blocking_pids| gidugayon +-----------+------------------------+----------- ----------+--------------------------------+--------- --------------------------+---------------------+----------------- --- | 11288| relasyon| 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| relasyon| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| relasyon| 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| tupol| AccessExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34

Paggamit sa kasaysayan sa lock aron pag-analisar sa mga insidente sa pasundayag.

Usa ka hangyo nga adunay queryid=389015618226997618 nga gipatuman sa usa ka proseso nga adunay pid=11288 naghulat alang sa pag-block sugod sa 2019-09-17 10:00:00 sa 3 minuto.
Ang kandado gihuptan sa usa ka proseso nga adunay pid=11092
Usa ka proseso nga adunay pid=11092 nga nagpatuman sa usa ka hangyo nga adunay queryid=389015618226997618 sugod sa 2019-09-17 10:00:00 naggunit sa lock sa 3 minuto.

Ang resulta

Karon, nanghinaut ko, magsugod ang labing makapaikag ug mapuslanon nga bahin - pagkolekta sa mga estadistika ug pag-analisar sa mga kaso sa kasaysayan sa paghulat ug pag-block.

Sa umaabot, gusto ko nga motuo, makakuha kami usa ka set sa pipila nga mga nota (sama sa metalink sa Oracle).

Sa kinatibuk-an, tungod niini nga hinungdan nga ang pamaagi nga gigamit magamit sa tanan sa labing madali nga panahon.

Akong sulayan nga i-post ang proyekto sa github sa umaabot nga umaabot.

Source: www.habr.com

Usa sa mga pamaagi sa pagkuha sa kasaysayan sa lock sa PostgreSQL

Input data

Kasaysayan sa representasyon sa pg_locks

Paggawas

NAGHULAT SA MGA LOCK PINAAGI SA MGA LOCKTYPES

PAGKUHA SA MGA LOCK PINAAGI SA LOCKTYPES

NAGHULAT SA MGA LOCK PINAAGI SA MGA LOCKTYPES NI QUERYID

PAGKUHA SA MGA LOCK PINAAGI SA LOCKTYPES PINAAGI SA QUERYID

Ang resulta

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