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Pokušaj stvaranja analoga ASH-a za PostgreSQL

Formuliranje problema

Za optimizaciju PostgreSQL upita vrlo je potrebna sposobnost analize povijesti aktivnosti, posebno čekanja, zaključavanja i statistike tablice.

Dostupne mogućnosti

Alat za povijesnu analizu radnog opterećenja ili "AWR za Postgres": vrlo zanimljivo rješenje, ali nema povijesti pg_stat_activity i pg_locks.

pgsentinel proširenje :
«Sve prikupljene informacije pohranjuju se samo u RAM, a potrošena količina memorije regulirana je brojem zadnjih pohranjenih zapisa.

Dodano je polje queryid - isti queryid iz proširenja pg_stat_statements (potrebna predinstalacija).«

To bi, naravno, puno pomoglo, ali najproblematičnija je prva točka.”Sve prikupljene informacije pohranjuju se samo u RAM-u “, tj. postoji utjecaj na ciljnu bazu. Osim toga, nema povijesti zaključavanja i tablične statistike. Oni. rješenje je generalno govoreći nepotpuno: “Još nema gotovog paketa za instalaciju. Predlaže se preuzimanje izvora i samostalno sastavljanje biblioteke. Najprije trebate instalirati paket “devel” za vaš poslužitelj i postaviti put do pg_config u varijabli PATH.".

Općenito, frka je velika, a kod ozbiljnih produkcijskih baza možda se ne može ništa napraviti sa serverom. Opet treba smisliti nešto svoje.

Upozorenje.

Zbog dosta velikog obima i zbog nepotpunog razdoblja testiranja, članak je uglavnom informativne prirode, više kao skup teza i međurezultata.
Detaljniji materijal će biti pripremljen naknadno, u dijelovima

Nacrt zahtjeva za rješenje

Potrebno je razviti alat koji vam omogućuje pohranu:

pg_stat_activity pregled povijesti
Povijest zaključavanja sesije pomoću pogleda pg_locks

Zahtjev rješenja– minimizirati utjecaj na ciljanu bazu podataka.

Generalna ideja– agent za prikupljanje podataka se ne pokreće u ciljnoj bazi podataka, već u bazi podataka za praćenje kao systemd usluga. Da, moguć je određeni gubitak podataka, ali to nije kritično za izvješćivanje, ali nema utjecaja na ciljanu bazu podataka u smislu memorije i prostora na disku. A u slučaju korištenja skupa veza, utjecaj na korisničke procese je minimalan.

Faze provedbe

1. Servisni stolovi

Za pohranjivanje tablica koristi se zasebna shema, kako se ne bi komplicirala analiza glavnih korištenih tablica.

DROP SCHEMA IF EXISTS activity_hist ;
CREATE SCHEMA activity_hist AUTHORIZATION monitor ;

Važno: Shema se ne stvara u ciljnoj bazi podataka, već u bazi podataka za praćenje.

pg_stat_activity pregled povijesti

Tablica se koristi za pohranjivanje trenutnih snimaka prikaza pg_stat_activity

activity_hist.history_pg_stat_activity :

--ACTIVITY_HIST.HISTORY_PG_STAT_ACTIVITY
DROP TABLE IF EXISTS activity_hist.history_pg_stat_activity;
CREATE TABLE activity_hist.history_pg_stat_activity
(
  timepoint timestamp without time zone ,
  datid             oid  , 
  datname           name ,
  pid               integer,
  usesysid          oid    ,
  usename           name   ,
  application_name  text   ,
  client_addr       inet   ,
  client_hostname   text   ,
  client_port       integer,
  backend_start     timestamp with time zone ,
  xact_start        timestamp with time zone ,
  query_start       timestamp with time zone ,
  state_change      timestamp with time zone ,
  wait_event_type   text ,                     
  wait_event        text ,                   
  state             text ,                  
  backend_xid       xid  ,                 
  backend_xmin      xid  ,                
  query             text ,               
  backend_type      text ,  
  queryid           bigint
);

Za ubrzanje umetanja - bez indeksa ili ograničenja.

Za pohranu same povijesti koristi se particionirana tablica:

activity_hist.archive_pg_stat_activity :

DROP TABLE IF EXISTS activity_hist.archive_pg_stat_activity;
CREATE TABLE activity_hist.archive_pg_stat_activity
(
  timepoint timestamp without time zone ,
  datid             oid  , 
  datname           name ,
  pid               integer,
  usesysid          oid    ,
  usename           name   ,
  application_name  text   ,
  client_addr       inet   ,
  client_hostname   text   ,
  client_port       integer,
  backend_start     timestamp with time zone ,
  xact_start        timestamp with time zone ,
  query_start       timestamp with time zone ,
  state_change      timestamp with time zone ,
  wait_event_type   text ,                     
  wait_event        text ,                   
  state             text ,                  
  backend_xid       xid  ,                 
  backend_xmin      xid  ,                
  query             text ,               
  backend_type      text ,
  queryid           bigint
)
PARTITION BY RANGE (timepoint);

Budući da u ovom slučaju nema zahtjeva za brzinom umetanja, stvoreni su neki indeksi koji ubrzavaju izradu izvješća.

Povijest blokiranja sesije

Tablica se koristi za pohranjivanje trenutnih snimaka zaključavanja sesije:

activity_hist.history_locking :

--ACTIVITY_HIST.HISTORY_LOCKING
DROP TABLE IF EXISTS activity_hist.history_locking;
CREATE TABLE activity_hist.history_locking
(
	timepoint timestamp without time zone ,
	locktype text ,
	relation oid ,
	mode text ,
	tid xid ,
	vtid text ,
	pid integer ,
	blocking_pids integer[] ,
	granted boolean
);

Također, kako bi se ubrzalo umetanje, nema indeksa ili ograničenja.

Za pohranu same povijesti koristi se particionirana tablica:

aktivnost_hist.archive_locking:

DROP TABLE IF EXISTS activity_hist.archive_locking;
CREATE TABLE activity_hist.archive_locking
(
	timepoint timestamp without time zone ,
	locktype text ,
	relation oid ,
	mode text ,
	tid xid ,
	vtid text ,
	pid integer ,
	blocking_pids integer[] ,
	granted boolean	
)
PARTITION BY RANGE (timepoint);

Budući da u ovom slučaju nema zahtjeva za brzinom umetanja, stvoreni su neki indeksi koji ubrzavaju izradu izvješća.

2. Ispunjavanje trenutne povijesti

Za izravno prikupljanje snimaka pogleda koristi se bash skripta koja pokreće funkciju plpgsql.

get_current_activity.sh

#!/bin/bash
#########################################################
#get_current_activity.sh

ERROR_FILE='/home/demon/get_current_activity'$(date +%Y%m%d-)'T'$(date +%H)$(date +%M)$(date +%S)
host=$1
s_name=$2
s_pass=$3

psql  -A -t -q -v ON_ERROR_STOP=1 -c "SELECT activity_hist.get_current_activity( '$host' , '$s_name' , '$s_pass' )" >/dev/null 2>$ERROR_FILE

line_count=`cat $ERROR_FILE | wc -l`
if [[ $line_count != '0' ]];
then
    rm -f /home/demon/*.err >/dev/null 2>/dev/null
	cp $ERROR_FILE $ERROR_FILE'.err' >/dev/null 2>/dev/null  
fi
rm $ERROR_FILE >/dev/null 2>/dev/null
exit 0

plpgsql Funkcija dblink pristupa prikazima u ciljnoj bazi podataka i umeće retke u servisne tablice u bazi podataka za praćenje.

get_current_activity.sql

CREATE OR REPLACE FUNCTION activity_hist.get_current_activity( current_host text , current_s_name text , current_s_pass text ) RETURNS BOOLEAN AS $$
DECLARE 
  database_rec record;
  dblink_str text ;
BEGIN   

	EXECUTE 'SELECT dblink_connect(''LINK1'',''host='||current_host||' port=5432 dbname=postgres'||
	                                         ' user='||current_s_name||' password='||current_s_pass|| ' '')';



--------------------------------------------------------------------
--GET pg_stat_activity stats
	INSERT INTO activity_hist.history_pg_stat_activity
	(
		SELECT * FROM dblink('LINK1',
			'SELECT 
			now() , 
			datid             , 
			datname           ,
			pid               ,
			usesysid              ,
			usename              ,
			application_name     ,
			client_addr          ,
			client_hostname      ,
			client_port       ,
			backend_start         ,
			xact_start            ,
			query_start           ,
			state_change          ,
			wait_event_type    ,                     
			wait_event         ,                   
			state              ,                  
			backend_xid         ,                 
			backend_xmin        ,                
			query              ,               
			backend_type   			
		FROM pg_stat_activity
		') 
		AS t (
		    timepoint 		  timestamp without time zone ,			
			datid             oid  , 
			datname           name ,
			pid               integer,
			usesysid          oid    ,
			usename           name   ,
			application_name  text   ,
			client_addr       inet   ,
			client_hostname   text   ,
			client_port       integer,
			backend_start     timestamp with time zone ,
			xact_start        timestamp with time zone ,
			query_start       timestamp with time zone ,
			state_change      timestamp with time zone ,
			wait_event_type   text ,                     
			wait_event        text ,                   
			state             text ,                  
			backend_xid       xid  ,                 
			backend_xmin      xid  ,                
			query             text ,               
			backend_type      text 			
		)
	);

---------------------------------------	
--ACTIVITY_HIST.HISTORY_LOCKING	
	INSERT INTO activity_hist.history_locking
	(
		SELECT * FROM dblink('LINK1',
			'SELECT 
			now() , 
			lock.locktype,
			lock.relation,
			lock.mode,
			lock.transactionid as tid,
			lock.virtualtransaction as vtid,
			lock.pid,
			pg_blocking_pids(lock.pid), 
			lock.granted
			FROM 	pg_catalog.pg_locks lock LEFT JOIN pg_catalog.pg_database db ON db.oid = lock.database
			WHERE NOT lock.pid = pg_backend_pid()	
		') 
		AS t (
			timepoint timestamp without time zone ,
			locktype text ,
			relation oid , 
			mode text ,
			tid xid ,
			vtid text ,
			pid integer ,
			blocking_pids integer[] ,
			granted boolean
		)
	);
	PERFORM dblink_disconnect('LINK1');
	
	RETURN TRUE ;
END
$$ LANGUAGE plpgsql;

Za prikupljanje snimki pregleda koristi se usluga systemd i dvije skripte:

pg_trenutna_aktivnost.usluga

# /etc/systemd/system/pg_current_activity.service
[Unit]
Description=Collect history of pg_stat_activity , pg_locks 
Wants=pg_current_activity.timer

[Service]
Type=forking
StartLimitIntervalSec=0
ExecStart=/home/postgres/pgutils/demon/get_current_activity.sh 10.124.70.40 postgres postgres

[Install]
WantedBy=multi-user.target

pg_current_activity.timer

# /etc/systemd/system/pg_current_activity.timer
[Unit]
Description=Run pg_current_activity.sh every 1 second
Requires=pg_current_activity.service

[Timer]
Unit=pg_current_activity.service
OnCalendar=*:*:0/1
AccuracySec=1

[Install]
WantedBy=timers.target

Dodijelite prava skriptama:
# chmod 755 pg_current_activity.timer
# chmod 755 pg_current_activity.service

Pokrenimo uslugu:
# systemctl daemon-reload
# systemctl pokrenite pg_current_activity.service

Stoga se povijest pregleda prikuplja u obliku snimaka sekunde po sekundu. Naravno, ako sve ostane kako jest, stolovi će se vrlo brzo povećati i više ili manje produktivan rad postat će nemoguć.

Potrebno je organizirati arhiviranje podataka.

3. Povijest arhiviranja

Za arhiviranje se koriste particionirane tablice archive*.

Nove se particije stvaraju svakih sat vremena, dok se stari podaci uklanjaju iz tablica povijesti*, tako da se veličina tablica povijesti* ne mijenja mnogo, a brzina umetanja ne opada tijekom vremena.

Kreiranje novih odjeljaka vrši plpgsql funkcija activity_hist.archive_current_activity. Algoritam rada je vrlo jednostavan (na primjeru odjeljka za tablicu archive_pg_stat_activity).

Stvorite i ispunite novi odjeljak

EXECUTE format(
'CREATE TABLE ' || partition_name || 
' PARTITION OF activity_hist.archive_pg_stat_activity FOR VALUES FROM ( %L ) TO ( %L ) ' , 
to_char(date_trunc('year', partition_min_range ),'YYYY')||'-'||
to_char(date_trunc('month', partition_min_range ),'MM')||'-'||
to_char(date_trunc('day', partition_min_range ),'DD')||' '||
to_char(date_trunc('hour', partition_min_range ),'HH24')||':00', 
to_char(date_trunc('year', partition_max_range ),'YYYY')||'-'||
to_char(date_trunc('month', partition_max_range ),'MM')||'-'||
to_char(date_trunc('day', partition_max_range ),'DD')||' '||
to_char(date_trunc('hour', partition_max_range ),'HH24')||':00'
);

INSERT INTO activity_hist.archive_pg_stat_activity
(
	SELECT 	* 
	FROM 	activity_hist.history_pg_stat_activity
	WHERE 	timepoint BETWEEN partition_min_range AND partition_max_range 		
);

Izrada indeksa

EXECUTE format	(
'CREATE INDEX '||index_name||
' ON '||partition_name||' ( wait_event_type , backend_type , timepoint )' 
);

EXECUTE format	('CREATE INDEX '||index_name||
' ON '||partition_name||' ( wait_event_type , backend_type , timepoint , queryid )' 
);

Uklanjanje starih podataka iz tablice history_pg_stat_activity

DELETE 
FROM 	activity_hist.history_pg_stat_activity
WHERE 	timepoint < partition_max_range;

Naravno, s vremena na vrijeme stare rubrike se brišu kao nepotrebne.

Osnovna izvješća

Zapravo, zašto se sve to radi? Za dobivanje izvješća koja vrlo nejasno podsjećaju na Oracleov AWR.

Važno je dodati da za primanje izvješća morate izgraditi vezu između pogleda pg_stat_activity i pg_stat_statements. Tablice su povezane dodavanjem stupca 'queryid' u tablice 'history_pg_stat_activity', 'archive_pg_stat_activity'. Metoda dodavanja vrijednosti stupca je izvan opsega ovog članka i opisana je ovdje − pg_stat_statements + pg_stat_activity + loq_query = pg_ash? .

UKUPNO CPU VRIJEME ZA UPITE

zahtjev:

WITH hist AS
(
SELECT 
	aa.query ,aa.queryid ,			
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.archive_pg_stat_activity aa
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 backend_type = 'client backend' AND datname != 'postgres' AND	( aa.wait_event_type IS NULL  ) ANDaa.state = 'active'
GROUP BY aa.wait_event_type , aa.wait_event , aa.query ,aa.queryid		
UNION 
SELECT 
	ha.query ,ha.queryid,
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.history_pg_stat_activity_for_reports ha
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 	backend_type = 'client backend' AND datname != 'postgres' AND ( ha.wait_event_type IS NULL  )AND ha.state = 'active'
GROUP BY ha.wait_event_type , ha.wait_event , ha.query ,ha.queryid		
)
SELECT 	query , queryid , SUM( duration ) as duration 
FROM hist
GROUP BY  query , queryid 
ORDER BY 3 DESC

Primjer:

-------------------------------------------------------------------
| TOTAL CPU TIME FOR QUERIES : 07:47:36
+----+----------------------------------------+--------------------
|   #|                                 queryid|            duration
+----+----------------------------------------+--------------------
|   1|                      389015618226997618|            04:28:58
|   2|                                        |            01:07:29
|   3|                     1237430309438971376|            00:59:38
|   4|                     4710212362688288619|            00:50:48
|   5|                       28942442626229688|            00:15:50
|   6|                     9150846928388977274|            00:04:46
|   7|                    -6572922443698419129|            00:00:06
|   8|                                        |            00:00:01
+----+----------------------------------------+--------------------

UKUPNO VRIJEME ČEKANJA NA UPITE

zahtjev:

WITH hist AS
(
SELECT 
	aa.query ,aa.queryid ,			
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.archive_pg_stat_activity aa
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 
	backend_type = 'client backend' AND datname != 'postgres' AND
	( aa.wait_event_type IS NOT NULL  ) 
GROUP BY aa.wait_event_type , aa.wait_event , aa.query ,aa.queryid		
UNION 
SELECT 
	ha.query ,ha.queryid,
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.history_pg_stat_activity_for_reports ha
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 
	backend_type = 'client backend' AND datname != 'postgres' AND				
	( ha.wait_event_type IS NOT NULL  )
GROUP BY ha.wait_event_type , ha.wait_event , ha.query ,ha.queryid		
)
SELECT 	query , queryid , SUM( duration ) as duration 
FROM hist
GROUP BY  query , queryid 
ORDER BY 3 DESC

Primjer:

-------------------------------------------------------------------
| TOTAL WAITINGS TIME FOR QUERIES : 21:55:04
+----+----------------------------------------+--------------------
|   #|                                 queryid|            duration
+----+----------------------------------------+--------------------
|   1|                      389015618226997618|            16:19:05
|   2|                                        |            03:47:04
|   3|                     8085340880788646241|            00:40:20
|   4|                     4710212362688288619|            00:13:35
|   5|                     9150846928388977274|            00:12:25
|   6|                       28942442626229688|            00:11:32
|   7|                     1237430309438971376|            00:09:45
|   8|                     2649515222348904837|            00:09:37
|   9|                                        |            00:03:45
|  10|                     3167065002719415275|            00:02:20
|  11|                     5731212217001535134|            00:02:13
|  12|                     8304755792398128062|            00:01:31
|  13|                     2649515222348904837|            00:00:59
|  14|                     2649515222348904837|            00:00:22
|  15|                                        |            00:00:12
|  16|                     3422818749220588372|            00:00:08
|  17|                    -5730801771815999400|            00:00:03
|  18|                    -1473395109729441239|            00:00:02
|  19|                     2404820632950544954|            00:00:02
|  20|                    -6572922443698419129|            00:00:02
|  21|                     2369289265278398647|            00:00:01
|  22|                      180077086776069052|            00:00:01
+----+----------------------------------------+--------------------

ČEKA UPITE

Zahtjevi:

WITH hist AS
(
SELECT 
	aa.wait_event_type , aa.wait_event 
FROM 	activity_hist.archive_pg_stat_activity aa
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 
	backend_type = 'client backend' AND datname != 'postgres' AND
	aa.wait_event IS NOT NULL 
GROUP BY aa.wait_event_type , aa.wait_event
UNION 
SELECT 
	ha.wait_event_type , ha.wait_event 
FROM 	activity_hist.history_pg_stat_activity_for_reports ha
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 
	backend_type = 'client backend' AND datname != 'postgres' AND
	ha.wait_event IS NOT NULL 
GROUP BY ha.wait_event_type , ha.wait_event		
)
SELECT 	wait_event_type , wait_event 
FROM hist
GROUP BY wait_event_type , wait_event
ORDER BY 1 ASC,2 ASC

----------------------------------------------------------------------

WITH hist AS
(
SELECT 
	aa.wait_event_type , aa.wait_event , aa.query ,aa.queryid ,			
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.archive_pg_stat_activity aa
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 
	backend_type = 'client backend' AND datname != 'postgres' AND
	( aa.wait_event_type = waitings_stat_rec.wait_event_type AND aa.wait_event = waitings_stat_rec.wait_event )
GROUP BY aa.wait_event_type , aa.wait_event , aa.query ,aa.queryid		
UNION 
SELECT 
	ha.wait_event_type , ha.wait_event , ha.query ,ha.queryid,
	count(*) * interval '1 second' AS duration 
FROM 	activity_hist.history_pg_stat_activity_for_reports ha
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 
	backend_type = 'client backend' AND datname != 'postgres' AND				
	( ha.wait_event_type = waitings_stat_rec.wait_event_type AND ha.wait_event = waitings_stat_rec.wait_event )
GROUP BY ha.wait_event_type , ha.wait_event , ha.query ,ha.queryid		
)
SELECT 	query , queryid , SUM( duration ) as duration 
FROM hist
GROUP BY  query , queryid 
ORDER BY 3 DESC

Primjer:

------------------------------------------------
| WAITINGS FOR QUERIES
+-----------------------------------------------
|                      wait_event_type = Client|
|                       wait_event = ClientRead|
|                        Total time  = 00:46:56|
------------------------------------------------
|    #|             queryid|            duration
+-----+--------------------+--------------------
|    1| 8085340880788646241|            00:40:20
|    2|                    |            00:03:45
|    3| 5731212217001535134|            00:01:53
|    4|                    |            00:00:12
|    5| 9150846928388977274|            00:00:09
|    6| 3422818749220588372|            00:00:08
|    7| 1237430309438971376|            00:00:06
|    8|   28942442626229688|            00:00:05
|    9| 4710212362688288619|            00:00:05
|   10|-5730801771815999400|            00:00:03
|   11| 8304755792398128062|            00:00:02
|   12|-6572922443698419129|            00:00:02
|   13|-1473395109729441239|            00:00:02
|   14| 2404820632950544954|            00:00:02
|   15|  180077086776069052|            00:00:01
|   16| 2369289265278398647|            00:00:01

+-----------------------------------------------
|                          wait_event_type = IO|
|                      wait_event = BufFileRead|
|                        Total time  = 00:00:38|
------------------------------------------------
|    #|             queryid|            duration
+-----+--------------------+--------------------
|    1|   28942442626229688|            00:00:38

+-----------------------------------------------

POVIJEST ZAKLJUČANIH PROCESA

Zahtjev:

SELECT 
MIN(date_trunc('second',timepoint)) AS started , 
	count(*) * interval '1 second' as duration ,
	pid , blocking_pids , relation , mode , locktype 	 
FROM 
	activity_hist.archive_locking al 
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 
	locktype = 'relation' 
GROUP BY pid , blocking_pids , relation , mode , locktype			
UNION
SELECT 
	MIN(date_trunc('second',timepoint)) AS started , 
	count(*) * interval '1 second' as duration ,
	pid , blocking_pids , relation , mode , locktype
FROM 
	activity_hist.history_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 
	locktype = 'relation' 
GROUP BY pid , blocking_pids , relation , mode , locktype			
ORDER BY 1

Primjer:

-------------------------------------------------- -------------------------------------------------- ---------------------------------- | POVIJEST ZAKLJUČANIH PROCESA +-----+----------+-----+-------- --+------------ --------+--------------------+----- --------------- +------------------- | #| pid| započeo| trajanje| blokiranje_pids| odnos| način| vrsta zaključavanja +----------+----------+-----+---------- +--------- -----------+-----------+------- -------------+----- -------------- | 1| 26224| 2019-09-02 19:32:16| 00:01:45| {26211}| 16541| AccessShareLock| odnos | 2| 26390| 2019-09-02 19:34:03| 00:00:53| {26211}| 16541| AccessShareLock| odnos | 3| 26391| 2019-09-02 19:34:03| 00:00:53| {26211}| 16541| AccessShareLock| odnos | 4| 26531| 2019-09-02 19:35:27| 00:00:12| {26211}| 16541| AccessShareLock| odnos | 5| 27284| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock| odnos | 6| 27283| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock| odnos | 7| 27286| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock| odnos | 8| 27423| 2019-09-02 19:45:24| 00:00:12| {27394}| 16541| AccessShareLock| odnos | 9| 27648| 2019-09-02 19:48:06| 00:00:20| {27647}| 16541| AccessShareLock| odnos | 10| 27650| 2019-09-02 19:48:06| 00:00:20| {27647}| 16541| AccessShareLock| odnos | 11| 27735| 2019-09-02 19:49:08| 00:00:06| {27650}| 16541| AccessExclusiveLock| odnos | 12| 28380| 2019-09-02 19:56:03| 00:01:56| {28379}| 16541| AccessShareLock| odnos | 13| 28379| 2019-09-02 19:56:03| 00:00:01| 28377| 16541| AccessExclusiveLock| odnos | | | | | 28376| |

POVIJEST PROCESA BLOKIRANJA

Zahtjevi:

SELECT 
blocking_pids 
FROM 
	activity_hist.archive_locking al 
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 
	locktype = 'relation' 
GROUP BY blocking_pids 		
UNION
SELECT 
	blocking_pids 
FROM 
	activity_hist.history_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 
	locktype = 'relation' 
GROUP BY blocking_pids 		
ORDER BY 1

---------------------------------------------------------------

SELECT 
	pid , usename , application_name , datname ,
	MIN(date_trunc('second',timepoint)) as started , 
	count(*) * interval '1 second' as duration ,		 
	state , 
	query
				FROM  	activity_hist.archive_pg_stat_activity
				WHERE 	pid= current_pid AND 
						timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') 						 
				GROUP BY pid , usename , application_name , 
						datname , 
						state_change, 
						state , 
						query 
				UNION
				SELECT 
					pid , usename , application_name , datname ,
					MIN(date_trunc('second',timepoint)) as started , 
					count(*) * interval '1 second' as duration ,		 
					state , 
					query
				FROM  	activity_hist.history_pg_stat_activity_for_reports
				WHERE 	pid= current_pid AND 
						timepoint BETWEEN pg_stat_history_begin+(current_hour_diff * interval '1 hour') AND pg_stat_history_end+(current_hour_diff * interval '1 hour') 						 
				GROUP BY pid , usename , application_name , 
						datname , 
						state_change, 
						state , 
						query 
				ORDER BY 5 , 1

Primjer:

-------------------------------------------------- -------------------------------------------------- -------------------------------------------------- ---------------------- POVIJEST PROCESA BLOKIRANJA +----+----------+------- ---+--------------------+----------+-------------- ------+--------------------+-------------------- - -------+------------------------------------------ | #| pid| korisničko ime| naziv_aplikacije| datname| započeo| trajanje| stanje| upit +----------+----------+----------+-----+ --------- -+--------------------+------------------ --+------ --------------------------------+---------------- ------- ----------------- | 1| 26211| tuser| psql| tdb1| 2019-09-02 19:31:54| 00:00:04| neaktivan| | 2| 26211| tuser| psql| tdb1| 2019-09-02 19:31:58| 00:00:06| mirovanje u transakciji| početi; | 3| 26211| tuser| psql| tdb1| 2019-09-02 19:32:16| 00:01:45| mirovanje u transakciji| zaključaj tablicu wafer_data; | 4| 26211| tuser| psql| tdb1| 2019-09-02 19:35:54| 00:01:23| neaktivan| počiniti; | 5| 26211| tuser| psql| tdb1| 2019-09-02 19:38:46| 00:00:02| mirovanje u transakciji| početi; | 6| 26211| tuser| psql| tdb1| 2019-09-02 19:38:54| 00:00:08| mirovanje u transakciji| zaključaj tablicu wafer_data; | 7| 26211| tuser| psql| tdb1| 2019-09-02 19:39:08| 00:42:42| neaktivan| počiniti; | 8| 26211| tuser| psql| tdb1| 2019-09-03 07:12:07| 00:00:52| aktivan| odaberite test_del();

Razvoj.

Osnovni prikazani upiti i rezultirajuća izvješća već znatno olakšavaju život pri analizi incidenata performansi.
Na temelju osnovnih upita možete dobiti izvješće koje neodređeno podsjeća na Oracleov AWR.
Primjer sažetog izvješća

+------------------------------------------------ ---------------------------------- | KONSOLIDIRANO IZVJEŠĆE ZA AKTIVNOSTI I ČEKANJA.

Nastavit će se. Sljedeća na redu je izrada povijesti zaključavanja (pg_stat_locks), detaljniji opis procesa popunjavanja tablica.

Izvor: www.habr.com

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