ProHoster > Π‘Π»ΠΎΠ³ > administratio > Conatum ad creandum analogum ASH pro PostgreSQL

Conatum ad creandum analogum ASH pro PostgreSQL

DE PECCATO quaestio

Ad optimize PostgreSQL queries, facultas analysin historicam activitatem, in specie, observat, seras et mensam statisticam, valde requiritur.

Praesto occasiones

Historical Workload Analysis Instrumentum seu "AWR ad Postgres"Valde interesting solutio, sed nulla historia pg_stat_activity et pg_locks.

pgsentinel extensio :
Β«Omnia cumulata indicia tantum in RAM reponuntur, et memoriae copia consumta ab ultimis monumentis condita regitur.

Ager queryid additur - idem queryid ex pg_stat_statuum extensione (pre-installation requiritur).Β«

Hoc sane multum proderit, sed primum illud molestissimum est.Omnes exaggeratus notitia reponitur in RAM ", i.e. est dapibus turpis. Praeterea nulla est historia crinem ac tabulam mutant. Illae. solutio plerumque incompleta loquitur: "Nulla sarcina parata ad institutionem adhuc facta est. suggeritur ut fontes deprimas et bibliothecam teipsum convenias. Primum debes sarcinam "devel" pro servo tuo instituere et viam ad pg_config in PATH variabilis pone.".

In genere multum negotii est, et in casu gravium datorum productionis, quidvis facere cum servo fieri non potest. Opus est ut cum aliquo nostro denuo ascendamus.

Admonitio.

Ob volumen magis magnum et propter incompletam probationem, articulus est maxime naturae informatricis, immo sicut copia thesium et eventus intermedii.
Materia accuratior postea paretur in partibus

Captura requisita ad solutionem

Necesse est instrumentum evolvere quod te condere sinit;

pg_stat_activity view history
Sessio historia cincinno utens pg_locks visum

Solutio postulationem-minimize impulsum in scopum database.

Generalis idea- notitia collectionis agens non in datorum clypeo, sed in magna datorum ratione ut servitii systematis educitur. Etiam aliqua notitia damnum potest, sed hoc in nuntiando non est criticum, sed in scopo database ictum non est secundum spatium memoriae et orbis. In casu autem utendi nexu piscinae, impetus in processibus usoris minimus est.

Gradus exsequendam

1.Service mensas

Schema separatum adhibetur ad tabulas apothecas, ne inpediant analysim tabularum principalis.

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

Maximus: Schema non est creatum in datorum clypeo, sed in datorum vigilantia.

pg_stat_activity view history

Mensa adhibetur ad reponendas venas snapshots pg_stat_activity view

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
);

Accelerare insertionem - nullae indices vel restrictiones.

Ad ipsam historiam condo, tabula partita adhibetur;

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);

Cum in hoc casu nullae requirantur ad celeritatem inserendam, quaedam indices ad creationem relationum accelerandam creata sunt.

Sessionem historiae claudebant

Mensa adhibetur ad reponunt current snapshots sessionis seras:

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
);

Item, ut accelerare debeas, non sunt indices vel restrictiones.

Ad ipsam historiam condo, tabula partita adhibetur;

activity_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);

Cum in hoc casu nullae requirantur ad celeritatem inserendam, quaedam indices ad creationem relationum accelerandam creata sunt.

2.Filling current historiae sunt

Ad rectam sententiam snapshots colligendam, scriptione vercundus adhibetur qui munus plpgsql decurrit.

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 Accessiones functionis dblink views in datorum scopo datorum et ordines in tabulas ministerium in datorum vigilantia inserit.

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;

Ad visum colligendos snapshots, ministerium systematicum et duo scripta adhibentur:

pg_current_activity.service

# /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

Iura scripta assignare:
chmod 755 pg_current_activity.timer
chmod 755 pg_current_activity.service

De servitio scriptor satus:
# Systemctl Reload daemonem,
systemctl # satus pg_current_activity.service

Sic historia sententiarum in secunda per snapshots forma colligitur. Sed si omnia quae supersunt, tabulae celerrime augebuntur et plus minusve opus fructuosum fiet impossibilis.

Data archiving ordinare necesse est.

3. Archiving history

In archivo tabulae, tabulae partitatae adhibentur.

Novae partitiones omni hora creantur, dum vetus notitia tabularum ab historia tollitur, ita magnitudo tabularum historiarum non multum mutat et celeritas insertio tempus non minuit.

Creatio novarum sectionum per plpgsql functionem activitatem_hist.archive_current_activity perficit. Algorithmus laboris valde simplex est (utens exemplo sectionis pro tabula archivorum stat_activity).

Novam partem crea et imple

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 		
);

Partum indices

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 )' 
);

Vetera notitia ex tabula history_pg_stat_activity removere

DELETE 
FROM 	activity_hist.history_pg_stat_activity
WHERE 	timepoint < partition_max_range;

Nimirum subinde veteres sectiones quasi superfluae deletae sunt.

Basic tradit

Profecto quare hoc agitur? Ad obtinendas relationes vage admodum simile AWR Oraculi.

Aliquam sit amet addere ut relationes recipias, nexum inter pg_stat_activity et pg_stat_statum sententiarum condere debes. Tabulae nectuntur addita columna "queryid" cum "historiae_pg_stat_activity", "archive_pg_stat_activity" tabularum. Modus addendi valorem columnae excedit ambitum huius articuli et hic describitur pg_stat_statements + pg_stat_activity + loq_query = pg_ash ? .

TOTAL CPU TEMPUS QUERIES

Petitio :

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

exempli gratia:

-------------------------------------------------------------------
| 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
+----+----------------------------------------+--------------------

TOTAL exspectationes TEMPUS QUERIES

Petitio :

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

exempli gratia:

-------------------------------------------------------------------
| 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
+----+----------------------------------------+--------------------

Expectat QUERIES

Petitiones:

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

exempli gratia:

------------------------------------------------
| 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

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

LOCKED DE PROCESSIBUS HISTORIAE

Rogatio:

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

exempli gratia:

-------------------------------------------------- -------------------------------------------------- --------------------------------- | LOCKED PROCESSIBUS HISTORIAE +-----+----------+-----+-------- --+------------ --------+------------------+----- --------------- +-------------------- | #| pid| coepi | duration| blocking_pids| relation| mode| locktype +----------+----------+-----+---------- +--------- -----------+-----------+------- -------------+----- -------------- | 1| 26224| 2019-09-02 19:32:16| 00:01:45| {26211}| 16541| AccessShareLock| relation | 2| 26390| 2019-09-02 19:34:03| 00:00:53| {26211}| 16541| AccessShareLock| relation | 3| 26391| 2019-09-02 19:34:03| 00:00:53| {26211}| 16541| AccessShareLock| relation | 4| 26531| 2019-09-02 19:35:27| 00:00:12| {26211}| 16541| AccessShareLock| relation | 5| 27284| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock| relation | 6| 27283| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock| relation | 7| 27286| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock| relation | 8| 27423| 2019-09-02 19:45:24| 00:00:12| {27394}| 16541| AccessShareLock| relation | 9| 27648| 2019-09-02 19:48:06| 00:00:20| {27647}| 16541| AccessShareLock| relation | 10| 27650| 2019-09-02 19:48:06| 00:00:20| {27647}| 16541| AccessShareLock| relation | 11| 27735| 2019-09-02 19:49:08| 00:00:06| {27650}| 16541| AccessExclusiveLock| relation | 12| 28380| 2019-09-02 19:56:03| 00:01:56| {28379}| 16541| AccessShareLock| relation | 13| 28379| 2019-09-02 19:56:03| 00:00:01| 28377| 16541| AccessExclusiveLock| relation | | | | | 28376| |

DE PROCESSIBUS OBSIDENDUS HISTORIA

Petitiones:

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

exempli gratia:

-------------------------------------------------- -------------------------------------------------- -------------------------------------------------- ----------------------- INTERPRETATIO PROCESSIBUS HISTORIAE +----+----------+------- ---+---------------------+----------+-------------- -------+------------------+-------------------------------- ------------------------------------------------------- | | #| pid| usename| application_name| datname| coepi | duration| state| quaesitum +----------+----------+----------+-----+ --------- -+------------------+------------------ --+------ ----------------------+----------------------- ----------------- | 1| 26211| tuser| psql| tdb1| 2019-09-02 19:31:54| 00:00:04| otiosus| | 2| 26211| tuser| psql| tdb1| 2019-09-02 19:31:58| 00:00:06| otiosus in transaction | Incipiunt; | 3| 26211| tuser| psql| tdb1| 2019-09-02 19:32:16| 00:01:45| otiosus in transaction | lock table wafer_data; | 4| 26211| tuser| psql| tdb1| 2019-09-02 19:35:54| 00:01:23| otiosus| committere; | 5| 26211| tuser| psql| tdb1| 2019-09-02 19:38:46| 00:00:02| otiosus in transaction | Incipiunt; | 6| 26211| tuser| psql| tdb1| 2019-09-02 19:38:54| 00:00:08| otiosus in transaction | lock table wafer_data; | 7| 26211| tuser| psql| tdb1| 2019-09-02 19:39:08| 00:42:42| otiosus| committere; | 8| 26211| tuser| psql| tdb1| 2019-09-03 07:12:07| 00:00:52| active| select test_del();

Development.

Quaestiones fundamentales ostensae sunt et inde relationes iam multo facilius vitam faciunt cum incidents analysing perficiendi.
Fundatis in quaestionibus fundamentalibus, relationem accipere potes quae vage simile est AWR Oraculi.
Exemplum fama summary

+------------------------------------------------ ------------------------------------ | CONSOLATUS SERMO ACTIONIS ET PLACITALIS.

Continuanda. Proxima linea est creatio historiae lock (pg_stat_locks), accuratior descriptio processus impletionum tabularum.

Source: www.habr.com