ProHoster > Π‘Π»ΠΎΠ³ > administratio > Cras PostgreSQL inquisitionis effectus. Pars 1 - renuntiatio

Cras PostgreSQL inquisitionis effectus. Pars 1 - renuntiatio

Ingenium - e Latino - inspiratum.
ingeniarius aliquid facere potest. (c) R. Diesel.
EPIGRAMMATA.
Cras PostgreSQL inquisitionis effectus. Pars 1 - renuntiatio
Vel narratio de causa quare administratoris database meminisse debet suum praeteritum programmandi.

praefatio

Omnia nomina mutata sunt. temere coincidentia sunt. Materia sola auctoris opinionem repraesentat personalem.

Disclaimer warantis: Articulorum series conposita non continent accuratam et accuratam tabularum et scriptorum descriptionem. Materiae statim adhiberi non possunt "AS IS".
Uno ex magno volumine;
secundo, propter arctam necessitudinem cum basi productionis veri emptoris.
Articuli ergo in communissima forma solum ideas et descriptiones continebunt.
Forsitan in futurum ratio crescet ad gradum dispositae in GitHub, vel fortasse non. Tempus ostendet.

Initium fabulae - "Meministi quomodo omnes coeperunt".
Quid inde evenit, in verbis communissimis - "Synthesis una modorum emendandi PostgreSQL perficiendiΒ»

Quid opus est his omnibus?

Primo quidem, ut non obliviscar, dies gloriosos in quiete reminiscens.
Secundo ut disponat ea quae scripta sunt. Quia interdum incipiunt confundi et quasdam partes oblivisci.

Bene, et maximi momenti est ut in promptu ad aliquem veniat et adiuvet ne reinventionem rotae et non rastro colligendo. Aliis verbis, emenda karma tuum (non Khabrov). Quia pretiosissimum in hoc mundo ideae sunt. Praecipua idea est invenire. Sed idea in rem conversa est quaestio mere technica.

Sic, paulatim incipiamus...

Formula problematis.

Praesto:

PostgreSQL(10.5) datorum, mixti oneris genus (OLTP+DSS), sarcina media levis, in nube AWS sita.
Nulla magna datorum est, sed magna infrastructura in forma instrumenti AWS vexillum minima configuratione providetur.

exigit:

Monitor faciendi et status datorum, invenire et habere initialem informationem ad optimizing gravia datorum quaesita.

Brevis introductio seu analysis solutionis optiones

In primis, studeamus analysin optiones ad problema solvendum ex parte analyseos comparativae beneficiorum et incommoditatum ad ipsum fabrum, et illi qui ei competit secundum cedulam bajulantem, de beneficiis ac damna procurationis.

Option 1 - "Opus in demanda"

ut omnia relinquimus. Si emptori non contentus in aliqua functione, persecutione datorum vel applicationis, fabrum DBA certiorem faciet ab inscriptione electronica vel incidenti in lance creando.
Praefectus, accepta notificatione, problema intelliget, solutionem vel quaestionem in turibulo posteriori ponet, sperans omnia se expediturum esse, et nihilominus omnia mox oblivioni tradenda erunt.
Gingerbread et doughnuts, livor et labefecitGingerbread et doughnuts:
1. Nihil opus est facere aliquid extra.
2. Est semper occasio excusandi et cochleae.
3. Multum temporis est quod pro tua prudentia expendas.
Livor et labefecit;
1. Mox vel serius, emptorem cogitabit de essentia exsistentiae et de iustitia universali in hoc mundo et iterum a se ipso quaesitum est - cur illis pecuniam meam solvo? Consequentia semper eadem est - sola quaestio est, cum emptorem perdenda et unda vale vale. et satietas vacua erit. Tristique sit.
2. Engineer development - nulla.
3. Difficultates in consilio opus et loading

Option 2- "Saltare cum tympanis, fumare et induere calceis"

Paragraphus 1Cur ratio vigilantia opus est, petitionibus omnia accipiemus. Fasciculum omnium quaesitorum ad notationes dictionarii ac dynamicas opiniones currimus, in calculis omnia genera vertimus, omnia in tabulas ponimus, ac tabulas et tabulas periodice analysi. Quam ob rem nos pulchras aut non tam pulchras graphas, tabulas, referimus. Summa est, plus, plus.
Paragraphus 2- Operationem generamus et analysin haec omnia deducimus.
Paragraphus 3- Paramus quoddam documentum, hoc solum documentum appellamus - "quomodo database constituere debeamus".
Paragraphus 4- Lorem, cum totum hunc grapharum ac numerorum splendorem, in puerili et simplici fiducia est - nunc omnia nobis mox operabuntur. Ac facile et sine dolore partes suas pecuniasque administrabat. In administratione nostra etiam confidimus magna opera fabrum nostrorum. Proin quis maximus ante.
Paragraphus 5Gradus I -Repeat semper.
Gingerbread et doughnuts, livor et labefecitGingerbread et doughnuts:
1. Vita curatorum et fabrum est simplex, praedictio et actione plena. Omnia fremunt, quisque est occupatus.
2. Lorem vita quoque mala non est - semper certus est quod iustus eget ut paulum patiens sit omniaque operantur. Melius non est, bene, mundus iniquus est, in altera vita felix eris.
Livor et labefecit;
1. Vel serius ocius erit provisor similium servitutis, qui idem faciet, sed paulo vilius. Et si idem est, cur plura. Quod rursus ad pascens ablatione ducunt.
2. taedet. Ut sit amet aliquam inani.
3. Sicut in priori versione nulla est explicatio. Sed ad ingeniarium, downside est quod, dissimilis optionis primae, debes constanter generare IBD. Etiam id suscipit dui. Quas expendere potes ad utilitatem dilecti tui. Quia curare te non potes, nemo de te refert.

Optio 3 - Bicyclum fingere non debes, modo emere et equitare debes.

Nihil non est quod fabrum ex aliis societatibus pizza cum cervisia comedat (oh, gloria dies St. Petersburg in 90s). Systematis vigilantiae utamur, quae factae sunt, debugged et operati sunt, et generaliter beneficium loquendo (bene, saltem creatoribus suis).
Gingerbread et doughnuts, livor et labefecitGingerbread et doughnuts:
1. Nihil opus est omittere tempus ascendendi cum aliquo iam invento. Accipe et utere.
2. Vigilantiae a stultis scriptae non sunt et sunt utique utiles.
3. Systemata vigilantia laborantes plerumque informationes eliquatas utiles praebere possunt.
Livor et labefecit;
1. Ingeniarius in hac causa ingeniarius non est, sed iustus usor alterius operis.
2. Emptorem persuasum esse debet de necessitate aliquid emere, quod, generaliter loquendo, intelligere nolit, et non debet, et generaliter praevisionem anni probatum et non mutatum. Tunc auxilium separatum collocare debes et pro certa ratione configurare. Illae. prius debes reddere, reddere et iterum reddere. et mos est avarus. Haec norma vitae.

Quid ad - Chernyshevsky? Valde pertinet quaestio tua. (Cum)

In hoc casu particulari et praesenti condicione, id paulo aliter facere potes. nostra magna ratio faciamus.
Cras PostgreSQL inquisitionis effectus. Pars 1 - renuntiatio
Bene, non ratio, utique, in sensu pleno verbi, nimis magna et praesumptuosa est, sed saltem aliquo modo negotium tuum facilius et plura notitias ad res agendis componendas componendas fac. Ut te in re non invenias - "Ibi, nescio ubi, aliquid reperio, quid nescio."

Quae sunt pros et cons huius optionis:

pros,
1. Hoc mihi gratum est. Bene, certe plus interesting est quam assidue "refugiat datafile, alterare tablespace, etc."
2. Hae sunt artes novae et progressus novae. Quae, serius aut serius, gingermam et donutam bene meritas tibi dabit.
cons:
1. laborandum erit. Laborare.
2. Omnino actionis sensum et spem regulariter explicabis.
3. Immolare aliquid debebit, quod unicum machinatori - tempore - ab universo limitatur copia.
4. Quod pessimum et injucundissimum - bullshit sicut "Non mus, non rana, sed animal ignotum."

Qui periculum non capit Campaniam non bibunt.
Sic β€” incipit iocus.

Generalis idea - schematically

Cras PostgreSQL inquisitionis effectus. Pars 1 - renuntiatio
(Illustratio ex articulo Β«Synthesis una modorum emendandi PostgreSQL perficiendiΒ»)

explicandum:

  • Vexillum PostgreSQL extensio "pg_stat_statements" in clypeo datorum inauguratur.
  • In magna datorum vigilantia, tabulas utiles creamus ad accommodandarum rerum pg_stat_statum historiae in primo statu et ad metricas instituendas et vigilantia in futuro.
  • In magna multitudine, copia litterarum vercundus creamus, in iis quae in tessera ratio incidentes gignunt.

Officium tabularum

Primum, schematicum simplicior ERD, quod factum est in fine:
Cras PostgreSQL inquisitionis effectus. Pars 1 - renuntiatio
Brevis descriptio tabularumendpoint - hospes, punctum connexionis ad instantiam
Database - database parametri
pg_stat_history - Tabula historica ad tempus accommodandi snapshots pg_stat_statementorum intuitu scopo database
metric_glossarium - dictionary of perficiendi metrics
metric_config - configuratione singula metrics
quod metrica illa - a propria postulatio metrica ad id est viverra
metric_alert_history - historia perficiendi admonitiones
log_query - in servitio mensa pro repono parsed records ex PostgreSQL stipes lima downloaded ex AWS
basi collocantur - ambitum temporis ut basis
LAPIS - Configuratione metrics ad reprehendo statum database
checkpoint_alert_history - Monitum historiae salutis database reprehendo metrics
pg_stat_db_queries - ministerium mensae petitiones activae
actio iniuriarum - actio iniuriarum ministerium in mensa
trap_oid - captionem configuratione ministerium mensa

Scaena 1 - statistica notitia collecta de agendis et relationibus recipiendis

Mensam adhibetur ad reponunt actuariorum notitia pg_stat_history
pg_stat_history table structure

                                          Table "public.pg_stat_history" Column | Type | Modifiers ----------------------+-------------------------------- -+---------------------------------------- id | integer | not null default nextval('pg_stat_history_id_seq'::regclass) snapshot_timestamp | indicatione temporis sine zona | database_id | integer | dbid | oid | userid | oid | queryid | bigint | query | text | vocat | bigint | total_time | duplex cura | min_time | duplex cura | max_time | duplex cura | mean_time | duplex cura | stddev_time | duplex cura | ordines | bigint | shared_blks_hit | bigint | shared_blks_read | bigint | shared_blks_dirtied | bigint | shared_blks_written | bigint | local_blks_hit | bigint | local_blks_read | bigint | local_blks_dirtied | bigint | local_blks_written | bigint | temp_blks_read | bigint | temp_blks_written | bigint | blk_read_time | duplex cura | blk_write_time | duplex cura | baseline_id | integer | Indices: "pg_stat_history_pkey" PRIMARY CLAVIS, btree (id) "database_idx" btree (database_id) "queryid_idx" btree (queryid) "snapshot_timestamp_idx" btree (snapshot_timestamp) angustiis datorum aliena-key ) DE DELETE CASCADE

Ut videre potes, mensa est sententia cumulativa data pg_stat_statements in scopum database.

Per hanc mensam valde simplex

pg_stat_history statisticae interrogationis exsecutionem pro unaquaque hora coacervatam exhibebit. Initio cuiusque horae, expleta mensa, statistica pg_stat_statements reset cum pg_stat_statements_reset ().
Note: Statistica pro quaestionibus collectis cum duratione exsecutionis plus quam 1 secundae.
Populatio ad mensam pg_stat_history

--pg_stat_history.sql
CREATE OR REPLACE FUNCTION pg_stat_history( ) RETURNS boolean AS $$
DECLARE
  endpoint_rec record ;
  database_rec record ;
  pg_stat_snapshot record ;
  current_snapshot_timestamp timestamp without time zone;
BEGIN
  current_snapshot_timestamp = date_trunc('minute',now());  
  
  FOR endpoint_rec IN SELECT * FROM endpoint 
  LOOP
    FOR database_rec IN SELECT * FROM database WHERE endpoint_id = endpoint_rec.id 
	  LOOP
	    
		RAISE NOTICE 'NEW SHAPSHOT IS CREATING';
		
		--Connect to the target DB	  
	    EXECUTE 'SELECT dblink_connect(''LINK1'',''host='||endpoint_rec.host||' dbname='||database_rec.name||' user=USER password=PASSWORD '')';
 
        RAISE NOTICE 'host % and dbname % ',endpoint_rec.host,database_rec.name;
		RAISE NOTICE 'Creating snapshot of pg_stat_statements for database %',database_rec.name;
		
		SELECT 
	      *
		INTO 
		  pg_stat_snapshot
	    FROM dblink('LINK1',
	      'SELECT 
	       dbid , SUM(calls),SUM(total_time),SUM(rows) ,SUM(shared_blks_hit) ,SUM(shared_blks_read) ,SUM(shared_blks_dirtied) ,SUM(shared_blks_written) , 
           SUM(local_blks_hit) , SUM(local_blks_read) , SUM(local_blks_dirtied) , SUM(local_blks_written) , SUM(temp_blks_read) , SUM(temp_blks_written) , SUM(blk_read_time) , SUM(blk_write_time)
	       FROM pg_stat_statements WHERE dbid=(SELECT oid from pg_database where datname=current_database() ) 
		   GROUP BY dbid
  	      '
	               )
	      AS t
	       ( dbid oid , calls bigint , 
  	         total_time double precision , 
	         rows bigint , shared_blks_hit bigint , shared_blks_read bigint ,shared_blks_dirtied bigint ,shared_blks_written	 bigint ,
             local_blks_hit	 bigint ,local_blks_read bigint , local_blks_dirtied bigint ,local_blks_written bigint ,
             temp_blks_read	 bigint ,temp_blks_written bigint ,
             blk_read_time double precision , blk_write_time double precision	  
	       );
		 
		INSERT INTO pg_stat_history
          ( 
		    snapshot_timestamp  ,database_id  ,
			dbid , calls  ,total_time ,
            rows ,shared_blks_hit  ,shared_blks_read  ,shared_blks_dirtied  ,shared_blks_written ,local_blks_hit , 	 	
            local_blks_read,local_blks_dirtied,local_blks_written,temp_blks_read,temp_blks_written, 	
            blk_read_time, blk_write_time 
		  )		  
	    VALUES
	      (
	       current_snapshot_timestamp ,
		   database_rec.id ,
	       pg_stat_snapshot.dbid ,pg_stat_snapshot.calls,
	       pg_stat_snapshot.total_time,
	       pg_stat_snapshot.rows ,pg_stat_snapshot.shared_blks_hit ,pg_stat_snapshot.shared_blks_read ,pg_stat_snapshot.shared_blks_dirtied ,pg_stat_snapshot.shared_blks_written , 
           pg_stat_snapshot.local_blks_hit , pg_stat_snapshot.local_blks_read , pg_stat_snapshot.local_blks_dirtied , pg_stat_snapshot.local_blks_written , 
	       pg_stat_snapshot.temp_blks_read , pg_stat_snapshot.temp_blks_written , pg_stat_snapshot.blk_read_time , pg_stat_snapshot.blk_write_time 	   
	      );		   
		  
        RAISE NOTICE 'Creating snapshot of pg_stat_statements for queries with min_time more than 1000ms';
	
        FOR pg_stat_snapshot IN
          --All queries with max_time greater than 1000 ms
	      SELECT 
	        *
	      FROM dblink('LINK1',
	        'SELECT 
	         dbid , userid ,queryid,query,calls,total_time,min_time ,max_time,mean_time, stddev_time ,rows ,shared_blks_hit ,
			 shared_blks_read ,shared_blks_dirtied ,shared_blks_written , 
             local_blks_hit , local_blks_read , local_blks_dirtied , 
			 local_blks_written , temp_blks_read , temp_blks_written , blk_read_time , 
			 blk_write_time
	         FROM pg_stat_statements 
			 WHERE dbid=(SELECT oid from pg_database where datname=current_database() AND min_time >= 1000 ) 
  	        '

	                  )
	        AS t
	         ( dbid oid , userid oid , queryid bigint ,query text , calls bigint , 
  	           total_time double precision ,min_time double precision	 ,max_time double precision	 , mean_time double precision	 ,  stddev_time double precision	 , 
	           rows bigint , shared_blks_hit bigint , shared_blks_read bigint ,shared_blks_dirtied bigint ,shared_blks_written	 bigint ,
               local_blks_hit	 bigint ,local_blks_read bigint , local_blks_dirtied bigint ,local_blks_written bigint ,
               temp_blks_read	 bigint ,temp_blks_written bigint ,
               blk_read_time double precision , blk_write_time double precision	  
	         )
	    LOOP
		  INSERT INTO pg_stat_history
          ( 
		    snapshot_timestamp  ,database_id  ,
			dbid ,userid  , queryid  , query  , calls  ,total_time ,min_time ,max_time ,mean_time ,stddev_time ,
            rows ,shared_blks_hit  ,shared_blks_read  ,shared_blks_dirtied  ,shared_blks_written ,local_blks_hit , 	 	
            local_blks_read,local_blks_dirtied,local_blks_written,temp_blks_read,temp_blks_written, 	
            blk_read_time, blk_write_time 
		  )		  
	      VALUES
	      (
	       current_snapshot_timestamp ,
		   database_rec.id ,
	       pg_stat_snapshot.dbid ,pg_stat_snapshot.userid ,pg_stat_snapshot.queryid,pg_stat_snapshot.query,pg_stat_snapshot.calls,
	       pg_stat_snapshot.total_time,pg_stat_snapshot.min_time ,pg_stat_snapshot.max_time,pg_stat_snapshot.mean_time, pg_stat_snapshot.stddev_time ,
	       pg_stat_snapshot.rows ,pg_stat_snapshot.shared_blks_hit ,pg_stat_snapshot.shared_blks_read ,pg_stat_snapshot.shared_blks_dirtied ,pg_stat_snapshot.shared_blks_written , 
           pg_stat_snapshot.local_blks_hit , pg_stat_snapshot.local_blks_read , pg_stat_snapshot.local_blks_dirtied , pg_stat_snapshot.local_blks_written , 
	       pg_stat_snapshot.temp_blks_read , pg_stat_snapshot.temp_blks_written , pg_stat_snapshot.blk_read_time , pg_stat_snapshot.blk_write_time 	   
	      );
		  
        END LOOP;

        PERFORM dblink_disconnect('LINK1');  
				
	  END LOOP ;--FOR database_rec IN SELECT * FROM database WHERE endpoint_id = endpoint_rec.id 
    
  END LOOP;

RETURN TRUE;  
END
$$ LANGUAGE plpgsql;

Quam ob rem post aliquod temporis spatium in mensa pg_stat_history habebimus a paro of snapshots de contentis in mensa pg_stat_statements target database.

Nam renuntiationes

Simplicibus quaestionibus utens, satis utiles et iucundas relationes accipere potes.

Aggregata data ad tempus datum

inquisitionis

SELECT 
  database_id , 
  SUM(calls) AS calls ,SUM(total_time)  AS total_time ,
  SUM(rows) AS rows , SUM(shared_blks_hit)  AS shared_blks_hit,
  SUM(shared_blks_read) AS shared_blks_read ,
  SUM(shared_blks_dirtied) AS shared_blks_dirtied,
  SUM(shared_blks_written) AS shared_blks_written , 
  SUM(local_blks_hit) AS local_blks_hit , 
  SUM(local_blks_read) AS local_blks_read , 
  SUM(local_blks_dirtied) AS local_blks_dirtied , 
  SUM(local_blks_written)  AS local_blks_written,
  SUM(temp_blks_read) AS temp_blks_read, 
  SUM(temp_blks_written) temp_blks_written , 
  SUM(blk_read_time) AS blk_read_time , 
  SUM(blk_write_time) AS blk_write_time
FROM 
  pg_stat_history
WHERE 
  queryid IS NULL AND
  database_id = DATABASE_ID  AND
  snapshot_timestamp BETWEEN BEGIN_TIMEPOINT AND END_TIMEPOINT
GROUP BY database_id ;

DB Tempus

to_char(intervallum '1 millisecondum' * pg_total_statum_rec.total_time, 'HH24:MI:SS.MS')

I/O Tempus

to_char ( interuallum ' 1 millisecundum ' * ( pg_total_stat_history_rec.blk_read_time + pg_total_stat_history_rec.blk_write_time ), 'HH24:MI:SS.MS')

TOP10 SQL by total_time

inquisitionis

SELECT 
  queryid , 
  SUM(calls) AS calls ,
  SUM(total_time)  AS total_time  	
FROM 
  pg_stat_history
WHERE 
  queryid IS NOT NULL AND 
  database_id = DATABASE_ID AND
  snapshot_timestamp BETWEEN BEGIN_TIMEPOINT AND END_TIMEPOINT 
GROUP BY queryid 
ORDER BY 3 DESC 
LIMIT 10
-------------------------------------------------- ------------------------------------ | TOP10 SQL BY TOTAL EXSECUTION TIME | #| queryid| vocat | vocat %| total_time (ms) | dbtime % +----------+-----------+-----------+-----------+ ------ ------------------------------+---------- | 1| 821760255| 2| .00001|00:03:23.141(203141.681 ms.)| 5.42 | 2| 4152624390| 2| .00001|00:03:13.929(193929.215 ms.)| 5.17 | 3| 1484454471| 4| .00001|00:02:09.129( 129129.057 ms.)| 3.44 | 4| 655729273| 1| .00000|00:02:01.869(121869.981 ms.)| 3.25 | 5| 2460318461| 1| .00000|00:01:33.113(93113.835 ms.)| 2.48 | 6| 2194493487| 4| .00001|00:00:17.377(17377.868 ms.)| .46 | 7| 1053044345| 1| .00000|00:00:06.156(6156.352 ms.)| .16 | 8| 3644780286| 1| .00000|00:00:01.063(1063.830 ms.)| .03

TOP10 SQL in summa I / O tempore

inquisitionis

SELECT 
  queryid , 
  SUM(calls) AS calls ,
  SUM(blk_read_time + blk_write_time)  AS io_time
FROM 
  pg_stat_history
WHERE 
  queryid IS NOT NULL AND 
  database_id = DATABASE_ID  AND
  snapshot_timestamp BETWEEN BEGIN_TIMEPOINT AND END_TIMEPOINT
GROUP BY  queryid 
ORDER BY 3 DESC 
LIMIT 10
-------------------------------------------------- ---------------------------------------- | TOP10 SQL BY TOTAL I/O TIME | #| queryid| vocat | vocat %| I/O tempus (ms)|db I/O tempus %+----+-----------+-----------+------ -----------+---------------------------------+----- ------ | 1| 4152624390| 2| .00001|00:08:31.616(511616.592 ms.)| 31.06 | 2| 821760255| 2| .00001|00:08:27.099(507099.036 ms.)| 30.78 | 3| 655729273| 1| .00000|00:05:02.209(302209.137 ms.)| 18.35 | 4| 2460318461| 1| .00000|00:04:05.981( 245981.117 ms.)| 14.93 | 5| 1484454471| 4| .00001|00:00:39.144(39144.221 ms.)| 2.38 | 6| 2194493487| 4| .00001|00:00:18.182(18182.816 ms.)| 1.10 | 7| 1053044345| 1| .00000|00:00:16.611( 16611.722 ms.)| 1.01 | 8| 3644780286| 1| .00000|00:00:00.436( 436.205 ms.)| .03

TOP10 SQL in max tempore executionis

inquisitionis

SELECT 
  id AS snapshotid , 
  queryid , 
  snapshot_timestamp ,  
  max_time 
FROM 
  pg_stat_history 
WHERE 
  queryid IS NOT NULL AND 
  database_id = DATABASE_ID  AND
  snapshot_timestamp BETWEEN BEGIN_TIMEPOINT AND END_TIMEPOINT
ORDER BY 4 DESC 
LIMIT 10

-------------------------------------------------- ---------------------------------------- | TOP10 SQL BY MAX EXSECUTION TIME | #| snapshot| snapshotID| queryid| max_time (ms) +----+------------------+-----------+--------- --+---------------------------------- | 1| 05.04.2019/01/03 4169:655729273| 00| 02| 01.869:121869.981:2(04.04.2019 ms.) | 17| 00/4153/821760255 00:01| 41.570| 101570.841| 3:04.04.2019:16(00 ms.) | 4146| 821760255/00/01 41.570:101570.841| 4| 04.04.2019| 16:00:4144(4152624390 ms.) | 00| 01/36.964/96964.607 5:04.04.2019| 17| 00| 4151:4152624390:00(01 ms.) | 36.964| 96964.607/6/05.04.2019 10:00| 4188| 1484454471| 00:01:33.452(93452.150 ms.) | 7| 04.04.2019/17/00 4150:2460318461| 00| 01| 33.113:93113.835:8( 04.04.2019 ms.) | 15| 00/4140/1484454471 00:00| 11.892| 11892.302| 9:04.04.2019:16(00 ms.) | 4145| 1484454471/00/00 11.892:11892.302| 10| 04.04.2019| 17:00:4152( 1484454471 ms.) | 00| 00/11.892/11892.302 XNUMX:XNUMX| XNUMX| XNUMX| XNUMX:XNUMX:XNUMX( XNUMX ms.) | XNUMX| XNUMX/XNUMX/XNUMX XNUMX:XNUMX| XNUMX| XNUMX| XNUMX:XNUMX:XNUMX( XNUMX ms.)

TOP10 SQL quiddam legere / scribere

inquisitionis

SELECT 
  id AS snapshotid , 
  queryid ,
  snapshot_timestamp , 
  shared_blks_read , 
  shared_blks_written 
FROM 
  pg_stat_history
WHERE 
  queryid IS NOT NULL AND 
  database_id = DATABASE_ID  AND
  snapshot_timestamp BETWEEN BEGIN_TIMEPOINT AND END_TIMEPOINT AND
  ( shared_blks_read > 0 OR shared_blks_written > 0 )
ORDER BY 4 DESC  , 5 DESC 
LIMIT 10
-------------------------------------------------- ---------------------------------------- | TOP10 SQL BUFFER Shared READ/WRITE | #| snapshot| snapshotID| queryid| participatur cuneos legitur | communi caudices scribe +----+------------------+-----------+---------- -+----------------------+--------------------- | 1| 04.04.2019/17/00 4153:821760255| 797308| 0| 2| 04.04.2019 | 16| 00/4146/821760255 797308:0| 3| 05.04.2019| 01| 03 | 4169| 655729273/797158/0 4:04.04.2019| 16| 00| 4144| 4152624390 | 756514| 0/5/04.04.2019 17:00| 4151| 4152624390| 756514| 0 | 6| 04.04.2019/17/00 4150:2460318461| 734117| 0| 7| 04.04.2019 | 17| 00/4155/3644780286 52973:0| 8| 05.04.2019| 01| 03 | 4168| 1053044345/52818/0 9:04.04.2019| 15| 00| 4141| 2194493487 | 52813| 0/10/04.04.2019 16:00| 4147| 2194493487| 52813| 0 | XNUMX| XNUMX/XNUMX/XNUMX XNUMX:XNUMX| XNUMX| XNUMX| XNUMX| XNUMX | XNUMX| XNUMX/XNUMX/XNUMX XNUMX:XNUMX| XNUMX| XNUMX| XNUMX| XNUMX ------------------------------------------------- ----------------------------------------

Histogrammum precum distributionis per tempus maximum supplicium

petitiones

SELECT  
  MIN(max_time) AS hist_min  , 
  MAX(max_time) AS hist_max , 
  (( MAX(max_time) - MIN(min_time) ) / hist_columns ) as hist_width
FROM 
  pg_stat_history 
WHERE 
  queryid IS NOT NULL AND
  database_id = DATABASE_ID  AND
  snapshot_timestamp BETWEEN BEGIN_TIMEPOINT AND END_TIMEPOINT ;

SELECT 
  SUM(calls) AS calls
FROM 
  pg_stat_history 
WHERE 
  queryid IS NOT NULL AND
  database_id =DATABASE_ID  AND
  snapshot_timestamp BETWEEN BEGIN_TIMEPOINT AND END_TIMEPOINT AND 
  ( max_time >= hist_current_min AND  max_time < hist_current_max ) ;

|------------------------------------------------ - ---------------------------------------- | MAX_TIME HISTOGRAM | TOTAL CALLS: 33851920 | MIN TIME: 00:00:01.063 | MAX TIME: 00:02:01.869 -------------------------------------------------------- ---------------------------------------- | min duration| max duration | vocat +--------------------------------+------------- ----------------------+---------- | 00:00:01.063(1063.830 ms.) | 00:00:13.144( 13144.445 ms.) | 9 | 00:00:13.144( 13144.445 ms.) | 00:00:25.225( 25225.060 ms.) | 0 | 00:00:25.225( 25225.060 ms.) | 00:00:37.305( 37305.675 ms.) | 0 | 00:00:37.305( 37305.675 ms.) | 00:00:49.386(49386.290 ms.) | 0 | 00:00:49.386(49386.290 ms.) | 00:01:01.466(61466.906 ms.) | 0 | 00:01:01.466(61466.906 ms.) | 00:01:13.547( 73547.521 ms.) | 0 | 00:01:13.547( 73547.521 ms.) | 00:01:25.628( 85628.136 ms.) | 0 | 00:01:25.628( 85628.136 ms.) | 00:01:37.708(97708.751 ms.) | 4 | 00:01:37.708(97708.751 ms.) | 00:01:49.789(109789.366 ms.) | 2 | 00:01:49.789(109789.366 ms.) | 00:02:01.869(121869.981 ms.) | 0

TOP10 Snapshots by Query per Second

petitiones

--pg_qps.sql
--Calculate Query Per Second 
CREATE OR REPLACE FUNCTION pg_qps( pg_stat_history_id integer ) RETURNS double precision AS $$
DECLARE
 pg_stat_history_rec record ;
 prev_pg_stat_history_id integer ;
 prev_pg_stat_history_rec record;
 total_seconds double precision ;
 result double precision;
BEGIN 
  result = 0 ;
  
  SELECT *
  INTO pg_stat_history_rec
  FROM 
    pg_stat_history
  WHERE id = pg_stat_history_id ;

  IF pg_stat_history_rec.snapshot_timestamp IS NULL 
  THEN
    RAISE EXCEPTION 'ERROR - Not found pg_stat_history for id = %',pg_stat_history_id;
  END IF ;  
  
 --RAISE NOTICE 'pg_stat_history_id = % , snapshot_timestamp = %', pg_stat_history_id , 
 pg_stat_history_rec.snapshot_timestamp ;
  
  SELECT 
    MAX(id)   
  INTO
    prev_pg_stat_history_id
  FROM
    pg_stat_history
  WHERE 
    database_id = pg_stat_history_rec.database_id AND
	queryid IS NULL AND
	id < pg_stat_history_rec.id ;

  IF prev_pg_stat_history_id IS NULL 
  THEN
    RAISE NOTICE 'Not found previous pg_stat_history shapshot for id = %',pg_stat_history_id;
	RETURN NULL ;
  END IF;
  
  SELECT *
  INTO prev_pg_stat_history_rec
  FROM 
    pg_stat_history
  WHERE id = prev_pg_stat_history_id ;
  
  --RAISE NOTICE 'prev_pg_stat_history_id = % , prev_snapshot_timestamp = %', prev_pg_stat_history_id , prev_pg_stat_history_rec.snapshot_timestamp ;    

  total_seconds = extract(epoch from ( pg_stat_history_rec.snapshot_timestamp - prev_pg_stat_history_rec.snapshot_timestamp ));
  
  --RAISE NOTICE 'total_seconds = % ', total_seconds ;    
  
  --RAISE NOTICE 'calls = % ', pg_stat_history_rec.calls ;      
  
  IF total_seconds > 0 
  THEN
    result = pg_stat_history_rec.calls / total_seconds ;
  ELSE
   result = 0 ; 
  END IF;
   
 RETURN result ;
END
$$ LANGUAGE plpgsql;


SELECT 
  id , 
  snapshot_timestamp ,
  calls , 	
  total_time , 
  ( select pg_qps( id )) AS QPS ,
  blk_read_time ,
  blk_write_time
FROM 
  pg_stat_history
WHERE 
  queryid IS NULL AND 
  database_id = DATABASE_ID  AND
  snapshot_timestamp BETWEEN BEGIN_TIMEPOINT AND END_TIMEPOINT AND
  ( select pg_qps( id )) IS NOT NULL 
ORDER BY 5 DESC 
LIMIT 10

|------------------------------------------------ - | ---------------------------------------- | TOP10 Snapshots iubet a QueryPerSeconds numeros ---------------------------------------- -------------------------------------------------- ------------------------------------------------- | #| snapshot| snapshotID| vocat | summa dbtime| QPS| I/O tempus| I/O tempus % +-----+------------------+-----------+------- ----+----------------------------------+---------- -+----------------------------------+----------- | 1| 04.04.2019/20/04 4161:5758631| 00| 06| 30.513:390513.926:1573.396( 00 ms.)| 00| 01.470:1470.110:376(2 ms.)| .04.04.2019 | 17| 00/4149/3529197 00:11| 48.830| 708830.618| 980.332:00:12(47.834 ms.)| 767834.052| 108.324:3:04.04.2019(16 ms.)| 00 | 4143| 3525360/00/10 13.492:613492.351| 979.267| 00| 08:41.396:521396.555(84.988 ms.)| 4| 04.04.2019:21:03(4163 ms.)| 2781536 | 00| 03/06.470/186470.979 785.745:00| 00| 00.249| 249.865:134:5( 04.04.2019 ms.)| 19| 03:4159:2890362(00 ms.)| .03 | 16.784| 196784.755 776.979:00| 00| 01.441| 1441.386:732:6(04.04.2019 ms.)| 14| 00:4137:2397326( 00 ms.)| .04 | 43.033| 283033.854/665.924/00 00:00.024| 24.505| 009| 7:04.04.2019:15(00 ms.)| 4139| 2394416:00:04(51.435 ms.)| .291435.010 | 665.116| 00/00/12.025 12025.895:4.126| 8| 04.04.2019| 13:00:4135(2373043 ms.)| 00| 04:26.791:266791.988( 659.179 ms.)| 00 | 00| 00.064 64.261:024| 9| 05.04.2019| 01:03:4167( 4387191 ms.)| 00| 06:51.380:411380.293(609.332 ms.)| .00 | 05| 18.847/318847.407/77.507 10:04.04.2019| 18| 01| 4157:1145596:00( 01 ms.)| 19.217| 79217.372:313.004:00( 00 ms.)| 01.319 | 1319.676| 1.666/XNUMX/XNUMX XNUMX:XNUMX| XNUMX| XNUMX| XNUMX:XNUMX:XNUMX( XNUMX ms.)| XNUMX| XNUMX:XNUMX:XNUMX( XNUMX ms.)| XNUMX

Hourly Executio Historiae cum QueryPerSeconds et I/O Time

inquisitionis

SELECT 
  id , 
  snapshot_timestamp ,
  calls , 	
  total_time , 
  ( select pg_qps( id )) AS QPS ,
  blk_read_time ,
  blk_write_time
FROM 
  pg_stat_history
WHERE 
  queryid IS NULL AND 
  database_id = DATABASE_ID  AND
  snapshot_timestamp BETWEEN BEGIN_TIMEPOINT AND END_TIMEPOINT
ORDER BY 2

|-----------------------------------------------------------------------------------------------
| HOURLY EXECUTION HISTORY  WITH QueryPerSeconds and I/O Time
-----------------------------------------------------------------------------------------------------------------------------------------------
| QUERY PER SECOND HISTORY
|    #|          snapshot| snapshotID|      calls|                      total dbtime|        QPS|                          I/O time| I/O time %
+-----+------------------+-----------+-----------+----------------------------------+-----------+----------------------------------+-----------
|    1|  04.04.2019 11:00|       4131|       3747|  00:00:00.835(       835.374 ms.)|      1.041|  00:00:00.000(          .000 ms.)|       .000
|    2|  04.04.2019 12:00|       4133|    1002722|  00:01:52.419(    112419.376 ms.)|    278.534|  00:00:00.149(       149.105 ms.)|       .133
|    3|  04.04.2019 13:00|       4135|    2373043|  00:04:26.791(    266791.988 ms.)|    659.179|  00:00:00.064(        64.261 ms.)|       .024
|    4|  04.04.2019 14:00|       4137|    2397326|  00:04:43.033(    283033.854 ms.)|    665.924|  00:00:00.024(        24.505 ms.)|       .009
|    5|  04.04.2019 15:00|       4139|    2394416|  00:04:51.435(    291435.010 ms.)|    665.116|  00:00:12.025(     12025.895 ms.)|      4.126
|    6|  04.04.2019 16:00|       4143|    3525360|  00:10:13.492(    613492.351 ms.)|    979.267|  00:08:41.396(    521396.555 ms.)|     84.988
|    7|  04.04.2019 17:00|       4149|    3529197|  00:11:48.830(    708830.618 ms.)|    980.332|  00:12:47.834(    767834.052 ms.)|    108.324
|    8|  04.04.2019 18:01|       4157|    1145596|  00:01:19.217(     79217.372 ms.)|    313.004|  00:00:01.319(      1319.676 ms.)|      1.666
|    9|  04.04.2019 19:03|       4159|    2890362|  00:03:16.784(    196784.755 ms.)|    776.979|  00:00:01.441(      1441.386 ms.)|       .732
|   10|  04.04.2019 20:04|       4161|    5758631|  00:06:30.513(    390513.926 ms.)|   1573.396|  00:00:01.470(      1470.110 ms.)|       .376
|   11|  04.04.2019 21:03|       4163|    2781536|  00:03:06.470(    186470.979 ms.)|    785.745|  00:00:00.249(       249.865 ms.)|       .134
|   12|  04.04.2019 23:03|       4165|    1443155|  00:01:34.467(     94467.539 ms.)|    200.438|  00:00:00.015(        15.287 ms.)|       .016
|   13|  05.04.2019 01:03|       4167|    4387191|  00:06:51.380(    411380.293 ms.)|    609.332|  00:05:18.847(    318847.407 ms.)|     77.507
|   14|  05.04.2019 02:03|       4171|     189852|  00:00:10.989(     10989.899 ms.)|     52.737|  00:00:00.539(       539.110 ms.)|      4.906
|   15|  05.04.2019 03:01|       4173|       3627|  00:00:00.103(       103.000 ms.)|      1.042|  00:00:00.004(         4.131 ms.)|      4.010
|   16|  05.04.2019 04:00|       4175|       3627|  00:00:00.085(        85.235 ms.)|      1.025|  00:00:00.003(         3.811 ms.)|      4.471
|   17|  05.04.2019 05:00|       4177|       3747|  00:00:00.849(       849.454 ms.)|      1.041|  00:00:00.006(         6.124 ms.)|       .721
|   18|  05.04.2019 06:00|       4179|       3747|  00:00:00.849(       849.561 ms.)|      1.041|  00:00:00.000(          .051 ms.)|       .006
|   19|  05.04.2019 07:00|       4181|       3747|  00:00:00.839(       839.416 ms.)|      1.041|  00:00:00.000(          .062 ms.)|       .007
|   20|  05.04.2019 08:00|       4183|       3747|  00:00:00.846(       846.382 ms.)|      1.041|  00:00:00.000(          .007 ms.)|       .001
|   21|  05.04.2019 09:00|       4185|       3747|  00:00:00.855(       855.426 ms.)|      1.041|  00:00:00.000(          .065 ms.)|       .008
|   22|  05.04.2019 10:00|       4187|       3797|  00:01:40.150(    100150.165 ms.)|      1.055|  00:00:21.845(     21845.217 ms.)|     21.812

Textus omnium SQL-eligit

inquisitionis

SELECT 
  queryid , 
  query 
FROM 
  pg_stat_history
WHERE 
  queryid IS NOT NULL AND 
  database_id = DATABASE_ID  AND
  snapshot_timestamp BETWEEN BEGIN_TIMEPOINT AND END_TIMEPOINT
GROUP BY queryid , query

exitum

Ut videre potes, adhibitis satis simplicibus mediis, multam utilem informationem de inposuit et statu datorum accipere potes.

Nota:Si queryid in quaestionibus recordamur, historiam quaesitum separatum obtinebimus (ad spatium servandum, relationes pro interrogatione separata omittuntur).

Itaque statistica notitia de inquisitione facienda in promptu est et colligitur.
Primus gradus "collectio notitiarum statisticarum" perficitur.

Ad secundum gradum progredi potes - "metris faciendis constituere".
Cras PostgreSQL inquisitionis effectus. Pars 1 - renuntiatio

Sed haec omnino alia fabula est.

Ut continued ...

Source: www.habr.com