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Siveyans pèfòmans demann PostgreSQL. Pati 1 - rapò

Enjenyè - tradui soti nan Latin - enspire.
Yon enjenyè ka fè anyen. (c) R. Diesel.
Epigraf.
Siveyans pèfòmans demann PostgreSQL. Pati 1 - rapò
Oswa yon istwa sou poukisa yon administratè baz done bezwen sonje sot pase pwogram li yo.

Avètisman

Tout non yo te chanje. Match yo o aza. Materyèl la se sèlman opinyon pèsonèl otè a.

Limit responsabilite nou sou garanti: nan seri atik ki te planifye yo pap gen deskripsyon detaye ak egzat sou tab yo ak ekriti yo itilize yo. Materyèl pa ka itilize imedyatman "KÒM SE".
Premyèman, akòz gwo kantite materyèl,
Dezyèmman, paske nan netteté ak baz pwodiksyon an nan yon kliyan reyèl.
Se poutèt sa, sèlman lide ak deskripsyon nan fòm ki pi jeneral yo pral bay nan atik yo.
Petèt nan fiti sistèm nan ap grandi nan nivo afiche sou GitHub, oswa petèt pa. Tan ap montre.

Kòmansman istwa a -Èske w sonje ki jan tout bagay te kòmanse?'.
Ki sa ki te pase kòm yon rezilta, nan tèm ki pi jeneral - "Sentèz kòm youn nan metòd pou amelyore pèfòmans PostgreSQL»

Poukisa mwen bezwen tout bagay sa yo?

Oke, premyèman, se konsa yo pa bliye tèt ou, sonje jou yo bèl pouvwa nan pran retrèt.
Dezyèmman, sistematize sa ki te ekri. Pou mwen menm, pafwa mwen kòmanse jwenn konfonn epi bliye pati separe.

Oke, ak pi enpòtan - toudenkou li ka vin an sou la men pou yon moun epi ede pa reenvante volan an epi yo pa kolekte yon rato. Nan lòt mo, amelyore karma ou (pa Khabrovsky). Pou bagay ki gen plis valè nan mond sa a se lide. Bagay pwensipal lan se jwenn yon lide. Ak tradui lide a an reyalite se deja yon pwoblèm piman teknik.

Se konsa, ann kòmanse tou dousman ...

Fòmasyon pwoblèm nan.

Disponib:

PostgreSQL (10.5), chaj melanje (OLTP + DSS), chaj mwayen ak limyè, anime nan nwaj AWS la.
Pa gen okenn siveyans baz done, siveyans enfrastrikti prezante kòm zouti AWS estanda nan yon konfigirasyon minim.

Li obligatwa:

Siveye pèfòmans ak estati baz done a, jwenn epi gen premye enfòmasyon pou optimize demann baz done lou.

Brèf entwodiksyon oswa analiz solisyon yo

Pou kòmanse, ann eseye analize opsyon yo pou rezoud pwoblèm nan nan pwen de vi nan yon analiz konparatif nan benefis yo ak pwoblèm pou enjenyè a, epi kite moun ki sipoze sou lis anplwaye a fè fas ak benefis yo ak pèt. nan jesyon.

Opsyon 1 - "Travay sou demann"

Nou kite tout bagay jan li ye. Si kliyan an pa satisfè ak yon bagay nan sante, pèfòmans nan baz done a oswa aplikasyon an, li pral notifye enjenyè DBA yo pa imel oswa pa kreye yon ensidan nan bwat la tikè.
Yon enjenyè, li te resevwa yon notifikasyon, pral konprann pwoblèm nan, ofri yon solisyon, oswa etajè pwoblèm nan, espere ke tout bagay pral rezoud tèt li, epi de tout fason, tout bagay pral byento bliye.
Gingerbread ak beye, boul ak boulGingerbread ak beye:
1. Pa gen anyen anplis pou fè
2. Toujou gen opòtinite pou soti ak sal.
3. anpil tan ke ou ka pase pou kont ou.
Konfizyon ak boul:
1. Talè oswa pita, kliyan an pral panse sou sans nan yo te ak jistis inivèsèl nan mond sa a ak yon lòt fwa ankò poze tèt li kesyon an - poukisa mwen peye yo lajan mwen an? Konsekans la se toujou menm bagay la - kesyon an sèlman se lè kliyan an vin anwiye ak balanse orevwa. Epi feeder la vid. Li tris.
2. Devlopman yon enjenyè se zewo.
3. Difikilte nan pwograme travay ak chaje

Opsyon 2 - "Danse ak tanbourin, mete yo epi mete soulye yo"

Paragraf 1-Poukisa nou bezwen yon sistèm siveyans, nou pral resevwa tout demann. Nou lanse yon pakèt tout kalite demann nan diksyonè done ak opinyon dinamik, limen tout kalite kontè, pote tout bagay nan tab, detanzantan analize lis ak tab, kòm li te ye. Kòm yon rezilta, nou gen bèl oswa pa trè graf, tab, rapò. Bagay pwensipal lan - sa ta dwe plis, plis.
Paragraf 2-Genere aktivite-kouri analiz de tout bagay sa yo.
Paragraf 3-Nou ap prepare yon sèten dokiman, nou rele dokiman sa a, tou senpleman - "ki jan nou ekipe baz done a."
Paragraf 4- Kliyan an, wè tout mayifisans sa a nan graf ak figi, se nan yon konfyans nayif timoun - kounye a tout bagay pral travay pou nou, byento. Epi, fasil epi san doulè pati ak resous finansye yo. Jesyon tou asire w ke enjenyè nou yo ap travay di. Max chaje.
Paragraf 5- Repete etap 1 regilyèman.
Gingerbread ak beye, boul ak boulGingerbread ak beye:
1. Lavi administratè yo ak enjenyè yo senp, previzib epi li ranpli ak aktivite. Tout bagay ap buz, tout moun okipe.
2. lavi kliyan a tou pa move - li toujou si ke ou bezwen pran pasyans yon ti kras Et tout bagay ap mache. Pa vin pi bon, byen, byen - mond sa a se enjis, nan lavi kap vini an - chans.
Konfizyon ak boul:
1. Pi bonè oswa pita, pral gen yon founisè pi entelijan nan yon sèvis menm jan an ki pral fè menm bagay la, men yon ti kras pi bon mache. Men, si rezilta a se menm, poukisa peye plis. Ki ankò ap mennen nan disparisyon nan feeder la.
2. Se raz. Ki jan raz nenpòt ti aktivite ki gen sans.
3. Kòm nan vèsyon anvan an - pa gen okenn devlopman. Men, pou yon enjenyè, mwens la se ke, kontrèman ak premye opsyon a, isit la ou bezwen toujou ap jenere yon IDB. E sa pran tan. Ki ka depanse pou benefis moun ou renmen an. Paske ou pa ka pran swen tèt ou, tout moun gen sousi pou ou.

Opsyon 3-Pa bezwen envante yon bisiklèt, ou bezwen achte li epi monte li.

Enjenyè ki soti nan lòt konpayi fè espre manje pitza ak byè (o, tan yo bèl pouvwa nan St Petersburg nan ane 90 yo). Ann sèvi ak sistèm siveyans ki fèt, debogaj ak k ap travay, epi an jeneral, yo pote benefis (byen, omwen pou kreyatè yo).
Gingerbread ak beye, boul ak boulGingerbread ak beye:
1. Pa bezwen gaspiye tan envante sa ki deja envante. Pran epi sèvi ak.
2. Siveyans sistèm yo pa ekri pa moun fou, ak nan kou yo itil.
3. Travay sistèm siveyans anjeneral bay enfòmasyon itil filtre.
Konfizyon ak boul:
1. Enjenyè a nan ka sa a se pa yon enjenyè, men se jis yon itilizatè pwodwi yon lòt moun oswa yon itilizatè.
2. Kliyan an dwe konvenki nan bezwen an achte yon bagay ke li jeneralman pa vle konprann, epi li pa ta dwe, ak an jeneral bidjè a pou ane a te apwouve epi yo pa pral chanje. Lè sa a, ou bezwen asiyen yon resous separe, konfigirasyon li pou yon sistèm espesifik. Moun sa yo. Premye ou bezwen peye, peye epi peye ankò. Ak kliyan an se chich. Sa a se nòmal nan lavi sa a.

Kisa pou w fè, Chernyshevsky? Kesyon w la trè enpòtan. (Ak)

Nan ka sa a patikilye ak sitiyasyon aktyèl la, ou ka fè yon ti jan diferan - an nou fè pwòp sistèm siveyans nou.
Siveyans pèfòmans demann PostgreSQL. Pati 1 - rapò
Oke, pa yon sistèm, nan kou, nan sans konplè mo a, sa a se twò fò ak presumptuous, men omwen yon jan kanmenm fè li pi fasil pou tèt ou ak kolekte plis enfòmasyon yo rezoud ensidan pèfòmans. Pou pa jwenn tèt ou nan yon sitiyasyon - "ale la, mwen pa konnen ki kote, jwenn sa, mwen pa konnen ki sa."

Ki avantaj ak dezavantaj opsyon sa a:

Pou:
1. Li enteresan. Oke, omwen pi enteresan pase konstan "retresi datafile, chanje tablespace, elatriye."
2. Sa yo se nouvo ladrès ak nouvo devlopman. Ki nan tan kap vini an, pi bonè oswa pita, pral bay Gingerbread byen merite ak beye.
Kont:
1. gen pou travay. Travay anpil.
2. Ou pral oblije eksplike regilyèman siyifikasyon ak pèspektiv tout aktivite.
3. Yon bagay pral gen yo dwe sakrifye, paske sèlman resous ki disponib nan enjenyè a - tan - limite pa Linivè.
4. Pi move a ak pi dezagreyab - kòm yon rezilta, fatra tankou "Pa yon sourit, pa yon krapo, men yon ti bèt enkoni" ka vire soti.

Ki moun ki pa riske yon bagay pa bwè chanpay.
Se konsa, plezi a kòmanse.

Lide jeneral - schematic

Siveyans pèfòmans demann PostgreSQL. Pati 1 - rapò
(Ilistrasyon pran nan atik la «Sentèz kòm youn nan metòd pou amelyore pèfòmans PostgreSQL»)

Eksplikasyon:

  • Baz done sib la enstale ak ekstansyon estanda PostgreSQL "pg_stat_statements".
  • Nan baz done siveyans la, nou kreye yon seri tab sèvis pou estoke istwa pg_stat_statements nan premye etap la ak konfigirasyon mezi ak siveyans alavni.
  • Sou lame siveyans la, nou kreye yon seri scripts bash, ki gen ladan sa yo pou jenere ensidan nan sistèm tikè a.

Tab sèvis yo

Pou kòmanse, yon ERD senplifye schematik, sa ki te pase nan fen a:
Siveyans pèfòmans demann PostgreSQL. Pati 1 - rapò
Brèf deskripsyon tab yopwen final - lame, pwen koneksyon ak egzanp lan
baz done - opsyon baz done
pg_stat_history - yon tablo istorik pou estoke snapshots tanporè nan gade pg_stat_statements nan baz done sib la
metrik_glosè - Diksyonè nan mezi pèfòmans
metrik_config - konfigirasyon mezi endividyèl yo
metrik - yon metrik espesifik pou demann lan ke yo te kontwole
metric_alert_history - istwa avètisman pèfòmans yo
log_query - Tablo sèvis pou estoke dosye analiz ki soti nan dosye PostgreSQL ki telechaje nan AWS
debaz - paramèt peryòd tan ki itilize kòm baz la
pòs - konfigirasyon mezi pou tcheke estati baz done a
checkpoint_alert_history - istwa avètisman sou mezi tcheke estati baz done yo
pg_stat_db_queries — tab sèvis demann aktif
aktivite_log — tab sèvis journal aktivite
trap_oid - tab sèvis konfigirasyon pèlen

Etap 1 - kolekte estatistik pèfòmans epi jwenn rapò

Yo itilize yon tab pou estoke enfòmasyon estatistik. pg_stat_history
pg_stat_history estrikti tab la

                                          Tablo "public.pg_stat_history" Kolòn | kalite | Modifikasyon--------------------+-------------------- --+---- ------------------------------- id | nonb antye relatif | pa nil default nextval('pg_stat_history_id_seq'::regclass) snapshot_timestamp | timestamp san timezone | database_id | nonb antye relatif | dbid | oid | id itilizatè | oid | queryid | bigint | rechèch | tèks | apèl | bigint | total_time | doub presizyon | min_time | doub presizyon | max_time | doub presizyon | mean_time | doub presizyon | stddev_time | doub presizyon | ranje | bigint | shared_blks_hit | bigint | shared_blks_read | bigint | shared_blks_dirtied | bigint | shared_blks_written | bigint | lokal_blks_hit | bigint | lokal_blks_read | bigint | lokal_blks_dirtied | bigint | lokal_blks_written | bigint | temp_blks_read | bigint | temp_blks_written | bigint | blk_read_time | doub presizyon | blk_write_time | doub presizyon | baseline_id | nonb antye relatif | Endèks: "pg_stat_history_pkey" KLE PRIMÈ, btree (id) "database_idx" btree (database_id) "queryid_idx" btree (queryid) "snapshot_timestamp_idx" btree (snapshot_timestamp) Foreign-key "database constraints" FOREIGN-KED_base_ID_DE: baz done (id ) ON DELETE CASCADE

Kòm ou ka wè, tablo a se jis yon done vi kimilatif pg_stat_statements nan baz done sib la.

Itilizasyon tab sa a trè senp.

pg_stat_history pral reprezante estatistik yo akimile nan ekzekisyon rechèch pou chak èdtan. Nan kòmansman chak èdtan, apre yo fin ranpli tablo a, estatistik pg_stat_statements reset ak pg_stat_statements_reset().
Remak: estatistik yo kolekte pou demann ki dire plis pase 1 segonn.
Peple tab la 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;

Kòm yon rezilta, apre yon sèten peryòd tan nan tab la pg_stat_history nou pral gen yon seri snapshots de sa ki nan tab la pg_stat_statements baz done sib.

Aktyèlman rapò

W ap itilize requêtes senp, ou ka jwenn byen itil Et enteresan rapò.

Done total pou yon peryòd tan

Ankèt

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 ;

D.B. Tan

to_char(entèval '1 milisgond' * pg_total_stat_history_rec.total_time, 'HH24:MI:SS.MS')

I/O Tan

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

TOP10 SQL pa total_time

Ankèt

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 PAR TAN EGZEKIZYON TOTAL | #| queryid| apèl| apèl %| tan_total (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 pa total I/O tan

Ankèt

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 PAR TAN I/O TOTAL | #| queryid| apèl| apèl %| I/O tan (ms)|db I/O tan % +----+-----------+-----------+------ -----+-------------------------------+------------ -- | 1| 4152624390| 2| .00001|00:08:31.616(511616.592 ms.)| 31.06 jen | 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 pa tan maksimòm nan ekzekisyon

Ankèt

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 PAR MAX EKZEKIZYON 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 pa SHARED tanpon lekti/ekri

Ankèt

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 PA TAMPON PATAJE LI/EKRI | #| snapshot| snapshotID| queryid| pataje blòk li| blòk pataje ekri +----+------------------+-----------+---------- -+---------------------+--------------------- | 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 ------------------------------------------------- ------------------------------------------------

Istogram distribisyon demann pa tan maksimòm ekzekisyon

Demann

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 APEL : 33851920 | MIN TIME : 00:00:01.063 | MAX TIME : 00:02:01.869 --------------------------------- -------- ---------------------------- | min dire| dire max| apèl +---------------------------------+-------------- ---------------------+---------- | 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 pa Rekèt pou chak segonn

Demann

--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 òdone pa nimewo QueryPerSeconds ------------------------------------- ------ ------------------------------------------ ------ ------------------------------------------- | #| snapshot| snapshotID| apèl| total dbtime| QPS | I/O tan | I/O tan % +-----+------------------+-----------+------- ----+---------------------------------+----------- -+---------------------------------+----------- | 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| 6:04.04.2019:14( 00 ms.)| 4137| 2397326:00:04( 43.033 ms.)| .283033.854 | 665.924| 00/00/00.024 24.505:009 | 7| 04.04.2019| 15:00:4139( 2394416 ms.)| 00| 04:51.435:291435.010( 665.116 ms.)| .00 | 00| 12.025/12025.895/4.126 8:04.04.2019| 13| 00| 4135:2373043:00( 04 ms.)| 26.791| 266791.988:659.179:00( 00 ms.)| 00.064 | 64.261| 024/9/05.04.2019 01:03| 4167| 4387191| 00:06:51.380( 411380.293 ms.)| 609.332| 00:05:18.847( 318847.407 ms.)| .77.507 | 10| 04.04.2019/18/01 4157:1145596| 00| 01| 19.217:79217.372:313.004( 00 ms.)| 00| 01.319:1319.676:1.666( XNUMX ms.)| XNUMX | XNUMX| XNUMX/XNUMX/XNUMX XNUMX:XNUMX| XNUMX| XNUMX| XNUMX:XNUMX:XNUMX( XNUMX ms.)| XNUMX| XNUMX:XNUMX:XNUMX( XNUMX ms.)| XNUMX

Istwa Egzekisyon Orè ak QueryPerSeconds ak I/O Tan

Ankèt

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

Tèks tout SQL chwazi

Ankèt

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

Total

Kòm ou ka wè, pa mwayen jistis senp, ou ka jwenn yon anpil nan enfòmasyon itil sou kantite travay la ak eta a nan baz done a.

Remak:Si ou ranje id la requête nan requêtes yo, lè sa a nou pral jwenn istwa a pou yon demann separe (pou ekonomize espas, rapò pou yon demann separe yo omisyon).

Se konsa, done estatistik sou pèfòmans rechèch ki disponib ak kolekte.
Premye etap "koleksyon done estatistik" fini.

Ou ka ale nan dezyèm etap la - "konfigirasyon mezi pèfòmans".
Siveyans pèfòmans demann PostgreSQL. Pati 1 - rapò

Men, sa a se yon istwa konplètman diferan.

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