🥇የመቆለፊያ ታሪክን በPostgreSQL | ለማግኘት አንዱ ዘዴ ፕሮሆስተር

የጽሁፉ ቀጣይ "ለ PostgreSQL የ ASH analogue ለመፍጠር የተደረገ ሙከራ ".

ጽሑፉ የpg_locks እይታን ታሪክ በመጠቀም ምን ጠቃሚ መረጃ ማግኘት እንደሚቻል የተወሰኑ ጥያቄዎችን እና ምሳሌዎችን ይመረምራል እና ያሳያል።

ማስጠንቀቂያ
በርዕሱ አዲስነት እና ባልተጠናቀቀው የሙከራ ጊዜ ምክንያት ጽሑፉ ስህተቶችን ሊይዝ ይችላል። ትችት እና አስተያየቶች በጣም የተቀበሉ እና የሚጠበቁ ናቸው.

የግቤት ውሂብ

የpg_locks ውክልና ታሪክ

ማህደር_መቆለፍ

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 
);

በመሠረቱ, ጠረጴዛው ከጠረጴዛው ጋር ተመሳሳይ ነው ማህደር_pg_stat_እንቅስቃሴእዚህ በበለጠ ዝርዝር ውስጥ ተብራርቷል - pg_stat_statements + pg_stat_እንቅስቃሴ + loq_query = pg_ash? እና እዚህ - ለ PostgreSQL የ ASH አናሎግ ለመፍጠር የተደረገ ሙከራ።

አንድ አምድ ለመሙላት ጥያቄ ተግባር ጥቅም ላይ ይውላል

ታሪክን_አዘምን_መቆለፍ_በጥያቄ

--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;

ማብራሪያ- የጥያቄ ዓምድ ዋጋ በታሪክ_መቆለፊያ ሠንጠረዥ ውስጥ ተዘምኗል፣ እና ከዚያ ለመዝገብ_መቆለፊያ ጠረጴዛ አዲስ ክፍልፍል ሲፈጠር እሴቱ በታሪካዊ እሴቶች ውስጥ ይከማቻል።

ውጤት

በአጠቃላይ ሂደቶች ላይ አጠቃላይ መረጃ.

መቆለፊያዎችን በመቆለፍ በመጠባበቅ ላይ

ጥያቄ

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

ለምሳሌ:

| መቆለፊያዎችን በመቆለፍ በመጠበቅ ላይ +---------------------------- ------------------ | የመቆለፊያ ዓይነት| ሁነታ| ቆይታ +----------------------------------- --+------------------- | ግብይት| ShareLock| 19፡39፡26 | tuple| AccessExclusiveLock| 00:03:35 +-------------------------------------------------- -------------

መቆለፊያዎችን በመቆለፊያ ዓይነቶች መውሰድ

ጥያቄ

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

ለምሳሌ:

| መቆለፊያዎችን በመቆለፊያ ዓይነቶች መውሰድ +------------ --------+---- | የመቆለፊያ ዓይነት| ሁነታ| ቆይታ +----------------------------------- --+------------------- | ግንኙነት| RowExclusiveLock| 51፡11፡10 | virtualxid| ExclusiveLock| 48፡10፡43 | ግብይት| ExclusiveLock| 44፡24፡53 | ግንኙነት| ይድረስShareLock| 20:06:13 | tuple| AccessExclusiveLock| 17፡58፡47 | tuple| ExclusiveLock| 01:40:41 | ግንኙነት| ShareUpdateExclusiveLock| 00:26:41 | እቃ| RowExclusiveLock| 00:00:01 | ግብይት| ShareLock| 00:00:01 | ማራዘም| ExclusiveLock| 00:00:01 +------------------------------------ -------------

በተወሰኑ የጥያቄ ጥያቄዎች ላይ ዝርዝር መረጃ

መቆለፊያዎችን በመጠበቅ ላይ በ LOCKTYPES በ QUERYID

ጥያቄ

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

ለምሳሌ:

| መቆለፊያዎችን በመቆለፍ በመጠባበቅ ላይ በQUERYID +--------------------------------- ----------------------------------- ------------------------ | ፒድ | የመቆለፊያ ዓይነት| ሁነታ| ጀመረ| queryid| ማገድ_pids| ቆይታ +--------------- ----------------- ---------------- --- | 11288| ግብይት| ShareLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11626| ግብይት| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12380}| 00:00:29 | 11626| ግብይት| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {11092}| 00:03:25 | 11626| ግብይት| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12213}| 00:01:55 | 11626| ግብይት| ShareLock| 2019-09-17 10:00:21.380921| 389015618226997618| {12751}| 00:00:01 | 11629| ግብይት| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {11092}| 00:03:22 | 11629| ግብይት| ShareLock| 2019-09-17 10:00:24.331935| 389015618226997618| {12007}| 00:00:01 | 12007| ግብይት| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11629}| 00:00:13 | 12007| ግብይት| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11092}| 00:01:10 | 12007| ግብይት| ShareLock| 2019-09-17 10:05:03.327933| 389015618226997618| {11288}| 00:00:05 | 12213| ግብይት| ShareLock| 2019-09-17 10:06:07.328019| 389015618226997618| {12007}| 00:00:10

መቆለፊያዎችን በ LOCKTYPES በ QUERYID መውሰድ

ጥያቄ

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

ለምሳሌ:

| መቆለፊያዎችን በመቆለፍ በQUERYID +---------------------------------- ------------------------------------ ----------------------- | ፒድ | የመቆለፊያ ዓይነት| ሁነታ| ጀመረ| queryid| ማገድ_pids| ቆይታ +--------------- ----------------- ---------------- --- | 11288| ግንኙነት| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {11092}| 00:03:34 | 11092| ግብይት| ExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:03:34 | 11288| ግንኙነት| RowExclusiveLock| 2019-09-17 10:00:00.302936| 389015618226997618| {}| 00:00:10 | 11092| ግንኙነት| 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| ግብይት| 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

የአፈጻጸም ክስተቶችን ለመተንተን የመቆለፊያ ታሪክን መጠቀም።

ጥያቄ በ queryid=389015618226997618 በ pid=11288 የተፈፀመ ጥያቄ ከ2019-09-17 10፡00፡00 ለ 3 ደቂቃዎች ለመከልከል እየጠበቀ ነበር።
መቆለፊያው በ pid=11092 በሂደት ተይዟል።
ከ11092-389015618226997618-2019 09:17:10 ጀምሮ pid=00 ጥያቄን በ queryid=00 የማስፈጸም ሂደት ለ3 ደቂቃ ያህል ቆልፏል።

ውጤቱ

አሁን ፣ እኔ ተስፋ አደርጋለሁ ፣ በጣም አስደሳች እና ጠቃሚው ክፍል ይጀምራል - ስታቲስቲክስን መሰብሰብ እና በመጠባበቅ እና በእገዳ ታሪክ ላይ ጉዳዮችን መተንተን።

ለወደፊቱ, ማመን እፈልጋለሁ, አንዳንድ ማስታወሻዎች ስብስብ እናገኛለን (ከኦራክል ሜታሊንክ ጋር ተመሳሳይ ነው).

በአጠቃላይ በዚህ ምክንያት ነው ጥቅም ላይ የዋለው ዘዴ በተቻለ ፍጥነት ለሁሉም ሰው ይቀርባል.

በቅርብ ጊዜ ውስጥ ፕሮጀክቱን በ github ላይ ለመለጠፍ እሞክራለሁ።

ምንጭ: hab.com

በ PostgreSQL ውስጥ የመቆለፊያ ታሪክን ለማግኘት አንዱ ዘዴ

የግቤት ውሂብ

የpg_locks ውክልና ታሪክ

ውጤት

መቆለፊያዎችን በመቆለፍ በመጠባበቅ ላይ

መቆለፊያዎችን በመቆለፊያ ዓይነቶች መውሰድ

መቆለፊያዎችን በመጠበቅ ላይ በ LOCKTYPES በ QUERYID

መቆለፊያዎችን በ LOCKTYPES በ QUERYID መውሰድ

ውጤቱ

አስተያየት ያክሉ ምላሽ መሰረዝ