🥇Iphathi ejabulisayo noma imigqa embalwa yezinkumbulo mayelana nokwazi ukwahlukanisa ku-PostgreSQL10

Isandulelo noma ukuthi umqondo wokuhlukaniswa wavela kanjani

Indaba iqala lapha: Uyakhumbula ukuthi konke kwaqala kanjani. Konke kwakungokokuqala futhi futhi. Ngemuva kokuthi cishe zonke izinsiza zokuthuthukisa isicelo, ngaleso sikhathi, zase ziphelile, kwaphakama umbuzo - yini elandelayo? Wavela kanje umqondo wokuhlukanisa.

Ukwehla kwezwi:
Impela 'ngalowo mzuzu', ngoba njengoba kwavela, kwakukhona izinqolobane zokuthuthukisa ezingasetshenzisiwe. Ngiyabonga asmm futhi Habru!

Ngakho-ke, ungayenza kanjani enye indlela ukujabulisa ikhasimende, futhi ngesikhathi esifanayo uthuthukise amakhono akho?

Ukuze wenze konke kube lula ngangokunokwenzeka, bese kunezindlela ezimbili kuphela zokuthuthukisa kakhulu okuthile ekusebenzeni kwesizindalwazi:
1) Indlela ebanzi - sandisa izinsiza, sishintsha ukucushwa;
2) Indlela ejulile - ukwenza kahle kombuzo

Njengoba, ngiyaphinda, ngaleso sikhathi kwakungasacaci ukuthi yini enye okufanele ishintshwe esicelweni sokusheshisa, kwakhethwa indlela - izinguquko design ithebula.

Ngakho-ke, kuphakama umbuzo oyinhloko: yini futhi sizoyishintsha kanjani?

Izimo zokuqala

Okokuqala, kukhona le ERD (eboniswe ngendlela eyenziwe lula):

Izici eziyinhloko:

ubudlelwano obuningi-kuningi
ithebula selivele linokhiye wokuhlukanisa ongase ube khona

Isicelo sangempela:

SELECT
            p."PARAMETER_ID" as  parameter_id,
            pc."PC_NAME" AS pc_name,
            pc."CUSTOMER_PARTNUMBER" AS customer_partnumber,
            w."LASERMARK" AS lasermark,
            w."LOTID" AS lotid,
            w."REPORTED_VALUE" AS reported_value,
            w."LOWER_SPEC_LIMIT" AS lower_spec_limit,
            w."UPPER_SPEC_LIMIT" AS upper_spec_limit,
            p."TYPE_CALCUL" AS type_calcul,
            s."SHIPMENT_NAME" AS shipment_name,
            s."SHIPMENT_DATE" AS shipment_date,
            extract(year from s."SHIPMENT_DATE") AS year,
            extract(month from s."SHIPMENT_DATE") as month,
            s."REPORT_NAME" AS report_name,
            p."SPARAM_NAME" AS SPARAM_name,
            p."CUSTOMERPARAM_NAME" AS customerparam_name
        FROM data w INNER JOIN shipment s ON s."SHIPMENT_ID" = w."SHIPMENT_ID"
             INNER JOIN parameters p ON p."PARAMETER_ID" = w."PARAMETER_ID"
             INNER JOIN shipment_pc sp ON s."SHIPMENT_ID" = sp."SHIPMENT_ID"
             INNER JOIN pc pc ON pc."PC_ID" = sp."PC_ID"
             INNER JOIN ( SELECT w2."LASERMARK" , MAX(s2."SHIPMENT_DATE") AS "SHIPMENT_DATE"
                          FROM shipment s2 INNER JOIN data w2 ON s2."SHIPMENT_ID" = w2."SHIPMENT_ID" 
                          GROUP BY w2."LASERMARK"
                         ) md ON md."SHIPMENT_DATE" = s."SHIPMENT_DATE" AND md."LASERMARK" = w."LASERMARK"
        WHERE 
             s."SHIPMENT_DATE" >= '2018-07-01' AND s."SHIPMENT_DATE" <= '2018-09-30' ;

Imiphumela yokusetshenziswa kusizindalwazi sokuhlola:
Cost : 502 997.55
Isikhathi sokwenza: Imizuzwana engu-505.

Sibonani? Isicelo esijwayelekile, esisuselwe kucezu lwesikhathi.
Masenze umcabango olula onengqondo: uma kukhona isampula yocezu lwesikhathi, ingabe izosisiza? Kulungile - ukwahlukanisa.

Yini ukuhlukanisa?

Uma uthi nhlá, ukukhetha kusobala - ukwahlukanisa okumemezelayo kwethebula "lokuthunyelwa" kusetshenziswa ukhiye "SHIPMENT_DATE" (ukugxumela phambili kakhulu - ekugcineni kwavela iphutha elincane ekukhiqizeni).

Indlela yokuhlukanisa?

Lo mbuzo nawo awunzima kakhulu. Ngenhlanhla, ku-PostgreSQL 10, manje sekukhona indlela yokuhlukanisa abantu.
Ngakho:

Londoloza ukulahlwa kwetafula lomthombo - pg_dump source_table
Susa ithebula lokuqala - yehlisa itafula source_table
Dala ithebula lomzali elinokuhlukaniswa kobubanzi - dala umthombo_ithebula
Dala izigaba - dala umthombo_ithebula, dala inkomba
Ngenisa indawo yokulahla edalwe esinyathelweni 1 - pg_buyisela

Imibhalo yokuhlukanisa

Ukuze kube lula futhi kube lula, izinyathelo 2,3,4 zihlanganiswe zaba umbhalo owodwa.

Ngakho:
Londoloza ukulahlwa kwethebula lomthombo

pg_dump postgres --file=/dump/shipment.dmp --format=c --table=shipment --verbose > /dump/shipment.log 2>&1

Susa ithebula lomthombo + Dala ithebula lomzali elinobubanzi bokuhlukanisa + Dala ama-partitions

--create_partition_shipment.sql
do language plpgsql $$
declare 
rec_shipment_date RECORD ;
partition_name varchar;
index_name varchar;
current_year varchar ;
current_month varchar ;
begin_year varchar ;
begin_month varchar ;
next_year varchar ;
next_month varchar ;
first_flag boolean ;
i integer ;
begin
  RAISE NOTICE 'CREATE TEMPORARY TABLE FOR SHIPMENT_DATE';
  CREATE TEMP TABLE tmp_shipment_date as select distinct "SHIPMENT_DATE" from shipment order by "SHIPMENT_DATE" ;

  RAISE NOTICE 'DROP TABLE shipment';
  drop table shipment cascade ;
  
  CREATE TABLE public.shipment
  (
    "SHIPMENT_ID" integer NOT NULL DEFAULT nextval('shipment_shipment_id_seq'::regclass),
    "SHIPMENT_NAME" character varying(30) COLLATE pg_catalog."default",
    "SHIPMENT_DATE" timestamp without time zone,
    "REPORT_NAME" character varying(40) COLLATE pg_catalog."default"
  )
  PARTITION BY RANGE ("SHIPMENT_DATE")
  WITH (
      OIDS = FALSE
  )
  TABLESPACE pg_default;

  RAISE NOTICE 'CREATE PARTITIONS FOR TABLE shipment';

  current_year:='0';
  current_month:='0';

  begin_year := '0' ;
  begin_month := '0'  ;
  next_year := '0' ;
  next_month := '0'  ;

  FOR rec_shipment_date IN SELECT * FROM tmp_shipment_date LOOP
      
      RAISE NOTICE 'SHIPMENT_DATE=%',rec_shipment_date."SHIPMENT_DATE";
      
      current_year := date_part('year' ,rec_shipment_date."SHIPMENT_DATE");
      current_month := date_part('month' ,rec_shipment_date."SHIPMENT_DATE") ; 

      IF to_number(current_month,'99') < 10 THEN
        current_month := '0'||current_month ; 
      END IF ;

      --Init borders
      IF   begin_year = '0' THEN
       first_flag := true ; --first time flag
       begin_year := current_year ;
       begin_month := current_month ;   
   
        IF current_month = '12' THEN
          next_year := date_part('year' ,rec_shipment_date."SHIPMENT_DATE" + interval '1 year') ;
        ELSE
          next_year := current_year ;
        END IF;
     
       next_month := date_part('month' ,rec_shipment_date."SHIPMENT_DATE" + interval '1 month') ;

      END IF;

      -- Check current date into borders NOT for First time
      IF to_date( current_year||'.'||current_month, 'YYYY.MM') >= to_date( begin_year||'.'||begin_month, 'YYYY.MM') AND 
         to_date( current_year||'.'||current_month, 'YYYY.MM') < to_date( next_year||'.'||next_month, 'YYYY.MM') AND 
         NOT first_flag 
      THEN
         CONTINUE ; 
      ELSE
       --NEW borders only for second and after time 
       begin_year := current_year ;
       begin_month := current_month ;   
   
        IF current_month = '12' THEN
          next_year := date_part('year' ,rec_shipment_date."SHIPMENT_DATE" + interval '1 year') ;
        ELSE
          next_year := current_year ;
        END IF;
     
       next_month := date_part('month' ,rec_shipment_date."SHIPMENT_DATE" + interval '1 month') ;

      END IF;      

      partition_name := 'shipment_shipment_date_'||begin_year||'-'||begin_month||'-01-'|| next_year||'-'||next_month||'-01'  ;
 
     EXECUTE format('CREATE TABLE ' || quote_ident(partition_name) || ' PARTITION OF shipment FOR VALUES FROM ( %L ) TO ( %L )  ' , current_year||'-'||current_month||'-01' , next_year||'-'||next_month||'-01'  ) ; 

      index_name := partition_name||'_shipment_id_idx';
      RAISE NOTICE 'INDEX NAME =%',index_name;
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("SHIPMENT_ID") TABLESPACE pg_default ' ) ; 

      --Drop first time flag
      first_flag := false ;
   
  END LOOP;

end
$$;

Ingenisa indawo yokulahla

pg_restore -d postgres --data-only --format=c --table=shipment --verbose  shipment.dmp > /tmp/data_dump/shipment_restore.log 2>&1

Ihlola imiphumela yokuhlukanisa

Yini esinayo ngenxa yalokho? Umbhalo ogcwele wohlelo lokubulala mkhulu futhi uyadina, ngakho-ke kungenzeka ukuthi uzikhawulele ezinombolweni zokugcina.

Kwakungu

Izindleko: 502 997.55
Isikhathi sokwenza: Imizuzwana engu-505.

Isibe

Izindleko: 77 872.36
Isikhathi sokwenza: Imizuzwana engu-79.

Umphumela omuhle impela. Izindleko ezincishisiwe nesikhathi sokwenza. Ngakho-ke, ukusetshenziswa kokwahlukanisa kunikeza umphumela olindelekile futhi, ngokuvamile, akukho okumangazayo.

Yenza ikhasimende lijabule

Imiphumela yokuhlolwa yethulwe ekhasimendeni ukuze libuyekezwe. Futhi ngemva kokuyibuyekeza, banikezwa isinqumo esingalindelekile: "Kuhle, hlukanisa ithebula "ledatha".

Yebo, kodwa sihlole ithebula "lokuthunyelwa" elihluke ngokuphelele; ithebula elithi "data" alinayo inkambu ethi "SHIPMENT_DATE".

Akunankinga, engeza, shintsha. Into esemqoka ukuthi ikhasimende lanelisekile ngomphumela; imininingwane yokusetshenziswa ayibalulekile kakhulu.

Ukwehlukanisa ithebula elikhulu "idatha"

Ngokuvamile, abukho ubunzima obuthile obavelayo. Noma kunjalo, i-algorithm yokuhlukanisa ishintshile ngandlela-thile.

Yengeza ikholomu ethi “SHIPMENT_DATA” kuthebula elithi “data”

psql -h хост -U база -d юзер
=> ALTER TABLE data ADD COLUMN "SHIPMENT_DATE" timestamp without time zone ;

Gcwalisa amanani wekholomu ye-“SHIPMENT_DATA” kuthebula “ledatha” ngamanani ekholomu yegama elifanayo ukusuka kuthebula elithi “ukuthunyelwa”

-----------------------------
--update_data.sql
--updating for altered table "data" to values of "shipment_data" from the table "shipment"
--version 1.0
do language plpgsql $$
declare 
rec_shipment_data RECORD ;
shipment_date timestamp without time zone ; 
row_count integer ;
total_rows integer ;
begin

  select count(*) into total_rows from shipment ; 
  RAISE NOTICE 'Total %',total_rows;
  row_count:= 0 ;

  FOR rec_shipment_data IN SELECT * FROM shipment LOOP

   update data set "SHIPMENT_DATE" = rec_shipment_data."SHIPMENT_DATE" where "SHIPMENT_ID" = rec_shipment_data."SHIPMENT_ID";
   
   row_count:=  row_count +1 ;
   RAISE NOTICE 'row count = % , from %',row_count,total_rows;
  END LOOP;

end
$$;

Londoloza ukulahlwa kwethebula "yedatha".

pg_dump postgres --file=/dump/data.dmp --format=c --table=data --verbose > /dump/data.log 2>&1</source

Dala kabusha “idatha” yethebula elihlukanisiwe

--create_partition_data.sql
--create partitions for the table "wafer data" by range column "shipment_data" with one month duration
--version 1.0
do language plpgsql $$
declare 
rec_shipment_date RECORD ;
partition_name varchar;
index_name varchar;
current_year varchar ;
current_month varchar ;
begin_year varchar ;
begin_month varchar ;
next_year varchar ;
next_month varchar ;
first_flag boolean ;
i integer ;

begin

  RAISE NOTICE 'CREATE TEMPORARY TABLE FOR SHIPMENT_DATE';
  CREATE TEMP TABLE tmp_shipment_date as select distinct "SHIPMENT_DATE" from shipment order by "SHIPMENT_DATE" ;


  RAISE NOTICE 'DROP TABLE data';
  drop table data cascade ;


  RAISE NOTICE 'CREATE PARTITIONED TABLE data';
  
  CREATE TABLE public.data
  (
    "RUN_ID" integer,
    "LASERMARK" character varying(20) COLLATE pg_catalog."default" NOT NULL,
    "LOTID" character varying(80) COLLATE pg_catalog."default",
    "SHIPMENT_ID" integer NOT NULL,
    "PARAMETER_ID" integer NOT NULL,
    "INTERNAL_VALUE" character varying(75) COLLATE pg_catalog."default",
    "REPORTED_VALUE" character varying(75) COLLATE pg_catalog."default",
    "LOWER_SPEC_LIMIT" numeric,
    "UPPER_SPEC_LIMIT" numeric , 
    "SHIPMENT_DATE" timestamp without time zone
  )
  PARTITION BY RANGE ("SHIPMENT_DATE")
  WITH (
    OIDS = FALSE
  )
  TABLESPACE pg_default ;


  RAISE NOTICE 'CREATE PARTITIONS FOR TABLE data';

  current_year:='0';
  current_month:='0';

  begin_year := '0' ;
  begin_month := '0'  ;
  next_year := '0' ;
  next_month := '0'  ;
  i := 1;

  FOR rec_shipment_date IN SELECT * FROM tmp_shipment_date LOOP
      
      RAISE NOTICE 'SHIPMENT_DATE=%',rec_shipment_date."SHIPMENT_DATE";
      
      current_year := date_part('year' ,rec_shipment_date."SHIPMENT_DATE");
      current_month := date_part('month' ,rec_shipment_date."SHIPMENT_DATE") ; 

      --Init borders
      IF   begin_year = '0' THEN
       RAISE NOTICE '***Init borders';
       first_flag := true ; --first time flag
       begin_year := current_year ;
       begin_month := current_month ;   
   
        IF current_month = '12' THEN
          next_year := date_part('year' ,rec_shipment_date."SHIPMENT_DATE" + interval '1 year') ;
        ELSE
          next_year := current_year ;
        END IF;
     
       next_month := date_part('month' ,rec_shipment_date."SHIPMENT_DATE" + interval '1 month') ;

      END IF;

--      RAISE NOTICE 'current_year=% , current_month=% ',current_year,current_month;
--      RAISE NOTICE 'begin_year=% , begin_month=% ',begin_year,begin_month;
--      RAISE NOTICE 'next_year=% , next_month=% ',next_year,next_month;

      -- Check current date into borders NOT for First time

      RAISE NOTICE 'Current data = %',to_char( to_date( current_year||'.'||current_month, 'YYYY.MM'), 'YYYY.MM');
      RAISE NOTICE 'Begin data = %',to_char( to_date( begin_year||'.'||begin_month, 'YYYY.MM'), 'YYYY.MM');
      RAISE NOTICE 'Next data = %',to_char( to_date( next_year||'.'||next_month, 'YYYY.MM'), 'YYYY.MM');

      IF to_date( current_year||'.'||current_month, 'YYYY.MM') >= to_date( begin_year||'.'||begin_month, 'YYYY.MM') AND 
         to_date( current_year||'.'||current_month, 'YYYY.MM') < to_date( next_year||'.'||next_month, 'YYYY.MM') AND 
         NOT first_flag 
      THEN
         RAISE NOTICE '***CONTINUE';
         CONTINUE ; 
      ELSE
       --NEW borders only for second and after time 
       RAISE NOTICE '***NEW BORDERS';
       begin_year := current_year ;
       begin_month := current_month ;   
   
        IF current_month = '12' THEN
          next_year := date_part('year' ,rec_shipment_date."SHIPMENT_DATE" + interval '1 year') ;
        ELSE
          next_year := current_year ;
        END IF;
     
       next_month := date_part('month' ,rec_shipment_date."SHIPMENT_DATE" + interval '1 month') ;


      END IF;      

      IF to_number(current_month,'99') < 10 THEN
        current_month := '0'||current_month ; 
      END IF ;

      IF to_number(begin_month,'99') < 10 THEN
        begin_month := '0'||begin_month ; 
      END IF ;

      IF to_number(next_month,'99') < 10 THEN
        next_month := '0'||next_month ; 
      END IF ;

      RAISE NOTICE 'current_year=% , current_month=% ',current_year,current_month;
      RAISE NOTICE 'begin_year=% , begin_month=% ',begin_year,begin_month;
      RAISE NOTICE 'next_year=% , next_month=% ',next_year,next_month;

      partition_name := 'data_'||begin_year||begin_month||'01_'||next_year||next_month||'01'  ;

      RAISE NOTICE 'PARTITION NUMBER % , TABLE NAME =%',i , partition_name;
      
      EXECUTE format('CREATE TABLE ' || quote_ident(partition_name) || ' PARTITION OF data FOR VALUES FROM ( %L ) TO ( %L )  ' , begin_year||'-'||begin_month||'-01' , next_year||'-'||next_month||'-01'  ) ; 

      index_name := partition_name||'_shipment_id_parameter_id_idx';
      RAISE NOTICE 'INDEX NAME =%',index_name;
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("SHIPMENT_ID", "PARAMETER_ID") TABLESPACE pg_default ' ) ; 

      index_name := partition_name||'_lasermark_idx';
      RAISE NOTICE 'INDEX NAME =%',index_name;
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("LASERMARK" COLLATE pg_catalog."default") TABLESPACE pg_default ' ) ; 

      index_name := partition_name||'_shipment_id_idx';
      RAISE NOTICE 'INDEX NAME =%',index_name;
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("SHIPMENT_ID") TABLESPACE pg_default ' ) ; 

      index_name := partition_name||'_parameter_id_idx';
      RAISE NOTICE 'INDEX NAME =%',index_name;
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("PARAMETER_ID") TABLESPACE pg_default ' ) ; 

      index_name := partition_name||'_shipment_date_idx';
      RAISE NOTICE 'INDEX NAME =%',index_name;
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("SHIPMENT_DATE") TABLESPACE pg_default ' ) ; 

      --Drop first time flag
      first_flag := false ;

  END LOOP;
end
$$;

Layisha ukulahla okudalwe esinyathelweni sesi-3.

pg_restore -h хост -юзер -d база --data-only --format=c --table=data --verbose  data.dmp > data_restore.log 2>&1

Dala isigaba esihlukile sedatha endala

---------------------------------------------------
--create_partition_for_old_dates.sql
--create partitions for keeping old dates 
--version 1.0
do language plpgsql $$
declare 
rec_shipment_date RECORD ;
partition_name varchar;
index_name varchar;

begin

      SELECT min("SHIPMENT_DATE") AS min_date INTO rec_shipment_date from data ;

      RAISE NOTICE 'Old date is %',rec_shipment_date.min_date ;

      partition_name := 'data_old_dates'  ;

      RAISE NOTICE 'PARTITION NAME IS %',partition_name;

      EXECUTE format('CREATE TABLE ' || quote_ident(partition_name) || ' PARTITION OF data FOR VALUES FROM ( %L ) TO ( %L )  ' , '1900-01-01' , 
              to_char( rec_shipment_date.min_date,'YYYY')||'-'||to_char(rec_shipment_date.min_date,'MM')||'-01'  ) ; 

      index_name := partition_name||'_shipment_id_parameter_id_idx';
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("SHIPMENT_ID", "PARAMETER_ID") TABLESPACE pg_default ' ) ; 

      index_name := partition_name||'_lasermark_idx';
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("LASERMARK" COLLATE pg_catalog."default") TABLESPACE pg_default ' ) ; 

      index_name := partition_name||'_shipment_id_idx';
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("SHIPMENT_ID") TABLESPACE pg_default ' ) ; 

      index_name := partition_name||'_parameter_id_idx';
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("PARAMETER_ID") TABLESPACE pg_default ' ) ; 

      index_name := partition_name||'_shipment_date_idx';
      EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("SHIPMENT_DATE") TABLESPACE pg_default ' ) ; 

end
$$;

Imiphumela yokugcina:

Kwakungu
Izindleko: 502 997.55
Isikhathi sokwenza: Imizuzwana engu-505.

Isibe
Izindleko: 68 533.70
Isikhathi sokwenza: 69 imizuzwana

Ifanele, ifaneleka impela. Futhi uma sicabanga ukuthi endleleni sikwazile ukwenza kahle noma kancane indlela yokuhlukanisa ku-PostgreSQL 10 - umphumela omuhle kakhulu.

Ukudonsa phansi kweLyrical

Kungenzeka yini ukwenza kangcono nakakhulu - YEBO, UNGAKWAZI!Ukuze wenze lokhu udinga ukusebenzisa UKUBONA KWE-MATERIALIZED.
DALA UKUBUKA OKUNGENZEKAYO LASERMARK_VIEW

CREATE MATERIALIZED VIEW LASERMARK_VIEW 
AS
SELECT w."LASERMARK" , MAX(s."SHIPMENT_DATE") AS "SHIPMENT_DATE"
FROM shipment s INNER JOIN data w ON s."SHIPMENT_ID" = w."SHIPMENT_ID" 
GROUP BY w."LASERMARK" ;

CREATE INDEX lasermark_vw_shipment_date_ind on lasermark_view USING btree ("SHIPMENT_DATE") TABLESPACE pg_default;
analyze lasermark_view ;

Siphinda futhi sibhala isicelo:
Umbuzo usebenzisa umbono owenziwe ngezinto

SELECT
            p."PARAMETER_ID" as  parameter_id,
            pc."PC_NAME" AS pc_name,
            pc."CUSTOMER_PARTNUMBER" AS customer_partnumber,
            w."LASERMARK" AS lasermark,
            w."LOTID" AS lotid,
            w."REPORTED_VALUE" AS reported_value,
            w."LOWER_SPEC_LIMIT" AS lower_spec_limit,
            w."UPPER_SPEC_LIMIT" AS upper_spec_limit,
            p."TYPE_CALCUL" AS type_calcul,
            s."SHIPMENT_NAME" AS shipment_name,
            s."SHIPMENT_DATE" AS shipment_date,
            extract(year from s."SHIPMENT_DATE") AS year,
            extract(month from s."SHIPMENT_DATE") as month,
            s."REPORT_NAME" AS report_name,
            p."STC_NAME" AS STC_name,
            p."CUSTOMERPARAM_NAME" AS customerparam_name
        FROM data w INNER JOIN shipment s ON s."SHIPMENT_ID" = w."SHIPMENT_ID"
             INNER JOIN parameters p ON p."PARAMETER_ID" = w."PARAMETER_ID"
             INNER JOIN shipment_pc sp ON s."SHIPMENT_ID" = sp."SHIPMENT_ID"
             INNER JOIN pc pc ON pc."PC_ID" = sp."PC_ID"
             INNER JOIN LASERMARK_VIEW md ON md."SHIPMENT_DATE" = s."SHIPMENT_DATE" AND md."LASERMARK" = w."LASERMARK"
        WHERE 
              s."SHIPMENT_DATE" >= '2018-07-01' AND s."SHIPMENT_DATE" <= '2018-09-30';

Futhi sithola omunye umphumela:
Kwakungu
Izindleko: 502 997.55
Isikhathi sokwenza: 505 imizuzwana

Isibe
Izindleko: 42 481.16
Isikhathi sokwenza: Imizuzwana engu-43.

Nakuba, kunjalo, umphumela onjalo othembisayo uyinkohliso; imibono idinga ukuvuselelwa. Ngakho isikhathi esiphelele sokuthola idatha ngeke kusize kakhulu. Kodwa njengokuhlola kuyathakazelisa impela.

Empeleni, njengoba kwenzeka, ngiyabonga futhi asmm kanye noHabru!- Umbuzo ungathuthukiswa ngokwengeziwe.

I-Afterword

Ngakho, ikhasimende lanelisekile. KANYE kudingeka ukusizakala isimo.

Umsebenzi omusha: Yini ongaqhamuka nayo ukuze ujule futhi andise?

Bese ngikhumbula - bafo, asinakho ukugadwa kolwazi lwethu lwe-PostgreSQL.

Isandla ngenhliziyo, kusenokuqapha okuthile ngendlela ye-Cloud Watch ku-AWS. Kodwa yini inzuzo yalokhu kuqapha kwe-DBA? Ngokuvamile, akukho.

Uma unethuba lokuzenzela okuthile okuwusizo futhi okuthakazelisayo, awukwazi ukusebenzisa leli thuba...
FOR

Ngale ndlela sifika engxenyeni ethakazelisa kakhulu:

Disemba 3, 2018.
Ukwenza isinqumo sokuqala ucwaningo ngamakhono atholakalayo wokuqapha ukusebenza kwemibuzo ye-PostgreSQL.

Kodwa leyo indaba ehluke ngokuphelele.

Kuzoqhutshwa…

Source: www.habr.com

Iphathi ejabulisayo noma imigqa embalwa yezinkumbulo mayelana nokwazi ukwahlukanisa ku-PostgreSQL10