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Ymgais i greu analog ASH ar gyfer PostgreSQL

Datganiad o'r broblem

Er mwyn gwneud y gorau o ymholiadau PostgreSQL, mae angen y gallu i ddadansoddi hanes gweithgaredd, yn benodol, amseroedd aros, cloeon ac ystadegau bwrdd.

Cyfleoedd sydd ar gael

Offeryn Dadansoddi Llwyth Gwaith Hanesyddol neu "AWR ar gyfer Postgres": ateb diddorol iawn, ond nid oes hanes pg_stat_activity a pg_locks.

estyniad pgsentinel :
«Mae'r holl wybodaeth gronedig yn cael ei storio mewn RAM yn unig, ac mae faint o gof a ddefnyddir yn cael ei reoleiddio gan nifer y cofnodion storio diwethaf.

Ychwanegir y maes queryid - yr un queryid o'r estyniad pg_stat_statements (angen gosod ymlaen llaw).«

Byddai hyn, wrth gwrs, yn helpu llawer, ond y peth mwyaf trafferthus yw’r pwynt cyntaf.”Mae'r holl wybodaeth gronedig yn cael ei storio mewn RAM yn unig ”, h.y. mae effaith ar y sylfaen darged. Yn ogystal, nid oes hanes clo ac ystadegau tabl. Y rhai. mae'r ateb yn gyffredinol yn anghyflawn: “Nid oes pecyn parod i'w osod eto. Awgrymir lawrlwytho'r ffynonellau a rhoi'r llyfrgell at ei gilydd eich hun. Yn gyntaf mae angen i chi osod y pecyn “datblygu” ar gyfer eich gweinydd a gosod y llwybr i pg_config yn y newidyn PATH.".

Yn gyffredinol, mae llawer o ffwdan, ac yn achos cronfeydd data cynhyrchu difrifol, efallai na fydd yn bosibl gwneud unrhyw beth gyda'r gweinydd. Mae angen i ni feddwl am rywbeth ein hunain eto.

Rhybudd.

Oherwydd y cyfaint eithaf mawr ac oherwydd y cyfnod profi anghyflawn, mae'r erthygl at ddibenion gwybodaeth yn bennaf, yn hytrach fel set o draethodau ymchwil a chanlyniadau canolradd.
Bydd deunydd manylach yn cael ei baratoi yn ddiweddarach, mewn rhannau

Gofynion drafft ar gyfer y datrysiad

Mae angen datblygu offeryn sy'n eich galluogi i storio:

pg_stat_gweithgaredd hanes gweld
Hanes clo sesiwn gan ddefnyddio'r olwg pg_locks

Gofyniad datrysiad–lleihau'r effaith ar y gronfa ddata darged.

Syniad cyffredinol– caiff yr asiant casglu data ei lansio nid yn y gronfa ddata darged, ond yn y gronfa ddata fonitro fel gwasanaeth system. Ydy, mae rhywfaint o golli data yn bosibl, ond nid yw hyn yn hanfodol ar gyfer adrodd, ond nid oes unrhyw effaith ar y gronfa ddata darged o ran cof a gofod disg. Ac yn achos defnyddio cronfa gysylltu, mae'r effaith ar brosesau defnyddwyr yn fach iawn.

Camau gweithredu

Tablau 1.Service

Defnyddir sgema ar wahân i storio tablau, er mwyn peidio â chymhlethu'r dadansoddiad o'r prif dablau a ddefnyddir.

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

Pwysig: Nid yn y gronfa ddata darged y caiff y sgema ei greu, ond yn y gronfa ddata monitro.

pg_stat_gweithgaredd hanes gweld

Defnyddir y tabl pg_stat_activity i storio cipluniau cyfredol o'r olygfa

gweithgaredd_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
);

Er mwyn cyflymu'r gosodiad - dim mynegeion na chyfyngiadau.

I storio'r hanes ei hun, defnyddir tabl rhanedig:

gweithgaredd_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);

Gan nad oes unrhyw ofynion ar gyfer cyflymder mewnosod yn yr achos hwn, mae rhai mynegeion wedi'u creu i gyflymu'r broses o greu adroddiadau.

Hanes blocio sesiynau

Defnyddir tabl i storio cipluniau cyfredol o gloeon sesiwn:

gweithgaredd_hist.history_cloi :

--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
);

Hefyd, er mwyn cyflymu'r gosodiad, nid oes unrhyw fynegeion na chyfyngiadau.

I storio'r hanes ei hun, defnyddir tabl rhanedig:

gweithgaredd_hist.archif_cloi:

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);

Gan nad oes unrhyw ofynion ar gyfer cyflymder mewnosod yn yr achos hwn, mae rhai mynegeion wedi'u creu i gyflymu'r broses o greu adroddiadau.

2.Llenwi'r hanes cyfredol

I gasglu cipluniau gweld yn uniongyrchol, defnyddir sgript bash sy'n rhedeg y swyddogaeth 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 Mae'r swyddogaeth dblink yn cyrchu golygfeydd yn y gronfa ddata darged ac yn mewnosod rhesi mewn tablau gwasanaeth yn y gronfa ddata monitro.

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;

I gasglu cipluniau gweld, defnyddir y gwasanaeth systemd a dwy sgript:

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

Neilltuo hawliau i sgriptiau:
# chmod 755 pg_current_activity.timer
# chmod 755 pg_current_activity.service

Rydyn ni'n dechrau'r gwasanaeth:
# systemctl daemon-reload
# systemctl cychwyn pg_current_activity.service

Felly, cesglir hanes golygfeydd ar ffurf cipluniau eiliad-wrth-eiliad. Wrth gwrs, os bydd popeth ar ôl fel y mae, bydd y tablau'n cynyddu'n gyflym iawn mewn maint a bydd mwy neu lai o waith cynhyrchiol yn dod yn amhosibl.

Mae angen trefnu archifo data.

3. Hanes archifo

Ar gyfer archifo, defnyddir archif tablau rhanedig*.

Mae rhaniadau newydd yn cael eu creu bob awr, tra bod hen ddata yn cael ei dynnu o'r tablau hanes*, felly nid yw maint y tablau hanes* yn newid llawer ac nid yw'r cyflymder mewnosod yn diraddio dros amser.

Perfformir creu adrannau newydd gan y swyddogaeth plpgsql activity_hist.archive_current_activity. Mae'r algorithm gwaith yn syml iawn (gan ddefnyddio enghraifft yr adran ar gyfer y tabl gweithgaredd archive_pg_stat_activity).

Creu a llenwi adran newydd

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 		
);

Creu mynegeion

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 )' 
);

Tynnu hen ddata o'r tabl gweithgaredd history_pg_stat_activity

DELETE 
FROM 	activity_hist.history_pg_stat_activity
WHERE 	timepoint < partition_max_range;

Wrth gwrs, o bryd i'w gilydd, caiff hen adrannau eu dileu fel rhai diangen.

Adroddiadau sylfaenol

A dweud y gwir, pam mae hyn i gyd yn cael ei wneud? I gael adroddiadau yn annelwig iawn atgoffa rhywun o Oracle's AWR.

Mae'n bwysig ychwanegu bod angen i chi adeiladu cysylltiad rhwng y golygfeydd pg_stat_activity a pg_stat_statements er mwyn derbyn adroddiadau. Cysylltir y tablau drwy ychwanegu colofn 'queryid' at y tablau 'history_pg_stat_activity', 'archive_pg_stat_activity'. Mae'r dull o ychwanegu gwerth colofn y tu hwnt i gwmpas yr erthygl hon ac fe'i disgrifir yma − pg_stat_statements +pg_stat_activity +loq_query = pg_ash? .

CYFANSWM AMSER CPU AR GYFER YMHOLIADAU

Cais:

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

Enghraifft:

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

CYFANSWM AMSER AROS AR GYFER YMHOLIADAU

Cais:

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

Enghraifft:

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

AROS AM YMHOLIADAU

Ceisiadau:

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

Enghraifft:

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

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

HANES PROSESAU AR GLO

Cais:

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

Enghraifft:

---------------------------------------------- ---------------------------------------------- ------------------------------- | HANES PROSESAU AR GLO +-----+----------+-----+---------+----------- -------+------------------+----- -------------- +----------------- | #| pid| dechrau| hyd| blocio_pids| perthynas| modd| locktype +---------+---------+-----+---------------- ----------+----------+------------------+----- ------------- | 1| 26224| 2019-09-02 19:32:16| 00:01:45| {26211}| 16541| AccessShareLock| perthynas | 2| 26390| 2019-09-02 19:34:03| 00:00:53| {26211}| 16541| AccessShareLock| perthynas | 3| 26391| 2019-09-02 19:34:03| 00:00:53| {26211}| 16541| AccessShareLock| perthynas | 4| 26531| 2019-09-02 19:35:27| 00:00:12| {26211}| 16541| AccessShareLock| perthynas | 5| 27284| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock| perthynas | 6| 27283| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock| perthynas | 7| 27286| 2019-09-02 19:44:02| 00:00:19| {27276}| 16541| AccessShareLock| perthynas | 8| 27423| 2019-09-02 19:45:24| 00:00:12| {27394}| 16541| AccessShareLock| perthynas | 9| 27648| 2019-09-02 19:48:06| 00:00:20| {27647}| 16541| AccessShareLock| perthynas | 10| 27650| 2019-09-02 19:48:06| 00:00:20| {27647}| 16541| AccessShareLock| perthynas | 11| 27735| 2019-09-02 19:49:08| 00:00:06| {27650}| 16541| AccessExclusiveLock| perthynas | 12| 28380| 2019-09-02 19:56:03| 00:01:56| {28379}| 16541| AccessShareLock| perthynas | 13| 28379| 2019-09-02 19:56:03| 00:00:01| 28377| 16541| AccessExclusiveLock| perthynas | | | | | 28376| |

BLOCIO HANES PROSESAU

Ceisiadau:

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

Enghraifft:

----------------------------------------------- ----------------------------------------------- ----------------------------------------------- ---------------------- HANES PROSESAU RHOI +----+---------+------ ---+-------------------+---------+------------- ------+------------------+-------------------- ------+------------------------------------- | #| pid| enw defnydd| cais_enw| enw dat| dechrau| hyd| cyflwr| ymholiad +---------+----------+---------+-----+ -------- -+------------------+------------------+------ ------------------------+---------------------- ---------------- | 1| 26211| tuser| psql| tdb1| 2019-09-02 19:31:54| 00:00:04| segur| | 2| 26211| tuser| psql| tdb1| 2019-09-02 19:31:58| 00:00:06| segur mewn trafodiad| dechreu; | 3| 26211| tuser| psql| tdb1| 2019-09-02 19:32:16| 00:01:45| segur mewn trafodiad| wafer_data bwrdd clo; | 4| 26211| tuser| psql| tdb1| 2019-09-02 19:35:54| 00:01:23| segur| ymrwymo; | 5| 26211| tuser| psql| tdb1| 2019-09-02 19:38:46| 00:00:02| segur mewn trafodiad| dechreu; | 6| 26211| tuser| psql| tdb1| 2019-09-02 19:38:54| 00:00:08| segur mewn trafodiad| wafer_data bwrdd clo; | 7| 26211| tuser| psql| tdb1| 2019-09-02 19:39:08| 00:42:42| segur| ymrwymo; | 8| 26211| tuser| psql| tdb1| 2019-09-03 07:12:07| 00:00:52| gweithredol| dewiswch test_del();

Datblygiad.

Mae'r ymholiadau sylfaenol a ddangoswyd a'r adroddiadau dilynol eisoes yn gwneud bywyd yn llawer haws wrth ddadansoddi digwyddiadau perfformiad.
Yn seiliedig ar ymholiadau sylfaenol, gallwch gael adroddiad sy'n ymdebygu'n fras i Oracle's AWR.
Enghraifft o adroddiad cryno

+-------------------------------------------- --------------------------------- | ADRODDIAD CYFUNOL AR GYFER GWEITHGAREDD AC AROS.

I'w barhau. Nesaf yn y llinell mae creu hanes clo (pg_stat_locks), disgrifiad manylach o'r broses o lenwi tablau.

Ffynhonnell: hab.com

Ychwanegu sylw