መቅድም ወይም የመከፋፈል ሃሳብ እንዴት እንደመጣ
ታሪኩ ከዚህ ይጀምራል፡- ጥያቄውን ለማመቻቸት ሁሉም ሀብቶች ከሞላ ጎደል በኋላ, በዚያን ጊዜ, ተዳክመዋል, ጥያቄው ተነሳ - ቀጥሎ ምን? የመከፋፈል ሀሳብ የተነሳው በዚህ መንገድ ነው።
ግጥማዊ ድፍረዛ፡
በትክክል 'በዚያ ቅጽበት'፣ ምክንያቱም ... አመሰግናለሁ እና ሀብሩ!
ስለዚህ, እንዴት ሌላ ደንበኛን ማስደሰት ይችላሉ, እና በተመሳሳይ ጊዜ የራስዎን ችሎታዎች ያሻሽሉ?
በተቻለ መጠን ሁሉንም ነገር ለማቃለልበመረጃ ቋቱ አፈጻጸም ውስጥ የሆነን ነገር በከፍተኛ ደረጃ ለማሻሻል ሁለት መንገዶች ብቻ አሉ።
1) ሰፊ መንገድ - ሀብቶችን እንጨምራለን, አወቃቀሩን እንለውጣለን;
2) የተጠናከረ መንገድ - የጥያቄ ማመቻቸት
እኔ እደግማለሁ ፣ በዚያን ጊዜ ለማፋጠን ጥያቄው ሌላ ምን መለወጥ እንዳለበት ግልፅ ስላልሆነ መንገዱ ተመርጧል - የጠረጴዛ ንድፍ ለውጦች.
ስለዚህ, ዋናው ጥያቄ የሚነሳው-ምን እና እንዴት እንለውጣለን?
የመጀመሪያ ሁኔታዎች
በመጀመሪያ፣ ይህ ERD አለ (በሁኔታዊ ሁኔታ በቀላል መንገድ የሚታየው)፡-
ቁልፍ ባህሪያት:
- ከብዙ እስከ ብዙ ግንኙነቶች
- ሠንጠረዡ አስቀድሞ የመከፋፈል ቁልፍ አለው።
የመጀመሪያ ጥያቄ፡-
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' ;
በሙከራ ዳታቤዝ ላይ የአፈጻጸም ውጤቶች፡-
ዋጋ : 502 997.55
የማስፈጸሚያ ጊዜ: 505 ሰከንዶች።
ስለምንታይ? መደበኛ ጥያቄ፣ በጊዜ ቁራጭ ላይ የተመሰረተ።
በጣም ቀላሉን አመክንዮአዊ ግምት እናድርገው፡ የአንድ ጊዜ ቁራጭ ናሙና ካለ ይጠቅመናል? ልክ ነው - መከፋፈል።
ምን ወደ ክፍል?
በመጀመሪያ ሲታይ ምርጫው ግልጽ ነው - የ"SHIPMENT_DATE" ቁልፍን በመጠቀም የ"ጭነት" ጠረጴዛውን ገላጭ መከፋፈል (በጣም ሩቅ ወደፊት መዝለል - በመጨረሻ በምርት ላይ ትንሽ ስህተት ሆነ).
እንዴት መከፋፈል ይቻላል?
ይህ ጥያቄም በጣም አስቸጋሪ አይደለም. እንደ እድል ሆኖ፣ በ PostgreSQL 10 ውስጥ፣ አሁን የሰው ክፍፍል ዘዴ አለ።
ስለዚህ:
- የምንጭ ጠረጴዛውን አንድ ቆሻሻ ያስቀምጡ - pg_የቆሻሻ ምንጭ_ጠረጴዛ
- የመጀመሪያውን ሰንጠረዥ ሰርዝ - የጠረጴዛ ምንጭ_ጠረጴዛ ጣል
- ከክልል ክፍፍል ጋር የወላጅ ጠረጴዛ ይፍጠሩ - የሰንጠረዥ ምንጭ_ሠንጠረዥ ፍጠር
- ክፍሎችን ይፍጠሩ - የሰንጠረዥ ምንጭ_ጠረጴዛ ፍጠር፣ ኢንዴክስ ፍጠር
- በደረጃ 1 የተፈጠረውን ቆሻሻ አስመጣ - pg_ወደነበረበት መመለስ
ለመከፋፈል ስክሪፕቶች
ለቀላል እና ምቾት፣ ደረጃዎች 2,3,4፣XNUMX፣XNUMX ወደ አንድ ስክሪፕት ተጣምረዋል።
ስለዚህ:
የምንጭ ጠረጴዛውን አንድ ቆሻሻ ያስቀምጡ
pg_dump postgres --file=/dump/shipment.dmp --format=c --table=shipment --verbose > /dump/shipment.log 2>&1የምንጭ ሠንጠረዡን ይሰርዙ + የወላጅ ሰንጠረዥ ከክልል ክፍፍል ጋር ይፍጠሩ + ክፍልፋዮችን ይፍጠሩ
--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
$$;የቆሻሻ መጣያውን ማስመጣት
pg_restore -d postgres --data-only --format=c --table=shipment --verbose shipment.dmp > /tmp/data_dump/shipment_restore.log 2>&1የመከፋፈል ውጤቶችን በማጣራት ላይ
በውጤቱ ምን አለን? የአፈፃፀም እቅድ ሙሉው ጽሑፍ ትልቅ እና አሰልቺ ነው, ስለዚህ እራስዎን በመጨረሻዎቹ ቁጥሮች ላይ መወሰን በጣም ይቻላል.
ነበር
ወጭ: 502 997.55
የማስፈጸሚያ ጊዜ፡- 505 ሰከንዶች.
ሆኗል
ወጭ: 77 872.36
የማስፈጸሚያ ጊዜ፡- 79 ሰከንዶች.
በጣም ጥሩ ውጤት. የተቀነሰ ወጪ እና የማስፈጸሚያ ጊዜ። ስለዚህ, ክፍፍልን መጠቀም የሚጠበቀው ውጤት እና በአጠቃላይ, ምንም አያስደንቅም.
ደንበኛው ደስተኛ እንዲሆን ያድርጉ
የፈተና ውጤቶቹ ለደንበኛው ቀርበዋል. እና እሱን ከገመገሙ በኋላ፣ “በጣም ጥሩ፣ “ውሂቡን” ሰንጠረዡን አካፍል።
አዎን፣ ግን ሙሉ ለሙሉ የተለየ የ"ጭነት" ሠንጠረዥ መርምረናል፤ የ"ውሂቡ" ሠንጠረዥ የ"SHIPMENT_DATE" መስክ የለውም።
ምንም ችግር የለም ፣ ይጨምሩ ፣ ይቀይሩ። ዋናው ነገር ደንበኛው በውጤቱ ረክቷል, የአተገባበሩ ዝርዝሮች በተለይ አስፈላጊ አይደሉም.
ዋናውን ሰንጠረዥ "ውሂብ" መከፋፈል
በአጠቃላይ ምንም ልዩ ችግሮች አልተከሰቱም. ምንም እንኳን የመከፋፈል ስልተ ቀመር, በእርግጥ, በተወሰነ መልኩ ተለውጧል.
የ"SHIPMENT_DATA" አምድ ወደ "ውሂብ" ሠንጠረዥ በማከል ላይ
psql -h хост -U база -d юзер
=> ALTER TABLE data ADD COLUMN "SHIPMENT_DATE" timestamp without time zone ;በ “መረጃ” ሠንጠረዥ ውስጥ የ “SHIPMENT_DATA” አምድ እሴቶችን ከ“ጭነት” ሠንጠረዥ ተመሳሳይ ስም ካለው አምድ ጋር ይሙሉ።
-----------------------------
--update_data.sql
--updating for altered table "data" to values of "shipment_data" from the table "shipment"
--version 1.0
do language plpgsql $$
declare
rec_shipment_data RECORD ;
shipment_date timestamp without time zone ;
row_count integer ;
total_rows integer ;
begin
select count(*) into total_rows from shipment ;
RAISE NOTICE 'Total %',total_rows;
row_count:= 0 ;
FOR rec_shipment_data IN SELECT * FROM shipment LOOP
update data set "SHIPMENT_DATE" = rec_shipment_data."SHIPMENT_DATE" where "SHIPMENT_ID" = rec_shipment_data."SHIPMENT_ID";
row_count:= row_count +1 ;
RAISE NOTICE 'row count = % , from %',row_count,total_rows;
END LOOP;
end
$$;የ"ውሂብ" ሠንጠረዥ አንድ ቆሻሻ ያስቀምጡ
pg_dump postgres --file=/dump/data.dmp --format=c --table=data --verbose > /dump/data.log 2>&1</sourceየተከፋፈለውን ሰንጠረዥ "ውሂብ" እንደገና ይፍጠሩ
--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
$$;
በደረጃ 3 የተፈጠረውን ቆሻሻ ይጫኑ።
pg_restore -h хост -юзер -d база --data-only --format=c --table=data --verbose data.dmp > data_restore.log 2>&1ለአሮጌው ውሂብ የተለየ ክፍል ይፍጠሩ
---------------------------------------------------
--create_partition_for_old_dates.sql
--create partitions for keeping old dates
--version 1.0
do language plpgsql $$
declare
rec_shipment_date RECORD ;
partition_name varchar;
index_name varchar;
begin
SELECT min("SHIPMENT_DATE") AS min_date INTO rec_shipment_date from data ;
RAISE NOTICE 'Old date is %',rec_shipment_date.min_date ;
partition_name := 'data_old_dates' ;
RAISE NOTICE 'PARTITION NAME IS %',partition_name;
EXECUTE format('CREATE TABLE ' || quote_ident(partition_name) || ' PARTITION OF data FOR VALUES FROM ( %L ) TO ( %L ) ' , '1900-01-01' ,
to_char( rec_shipment_date.min_date,'YYYY')||'-'||to_char(rec_shipment_date.min_date,'MM')||'-01' ) ;
index_name := partition_name||'_shipment_id_parameter_id_idx';
EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("SHIPMENT_ID", "PARAMETER_ID") TABLESPACE pg_default ' ) ;
index_name := partition_name||'_lasermark_idx';
EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("LASERMARK" COLLATE pg_catalog."default") TABLESPACE pg_default ' ) ;
index_name := partition_name||'_shipment_id_idx';
EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("SHIPMENT_ID") TABLESPACE pg_default ' ) ;
index_name := partition_name||'_parameter_id_idx';
EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("PARAMETER_ID") TABLESPACE pg_default ' ) ;
index_name := partition_name||'_shipment_date_idx';
EXECUTE format('CREATE INDEX ' || quote_ident(index_name) || ' ON '|| quote_ident(partition_name) ||' USING btree ("SHIPMENT_DATE") TABLESPACE pg_default ' ) ;
end
$$;የመጨረሻ ውጤቶች፡-
ነበር
ወጭ: 502 997.55
የማስፈጸሚያ ጊዜ: 505 ሰከንዶች።
ሆኗል
ወጭ: 68 533.70
የማስፈጸሚያ ጊዜ፡- 69 ሰከንዶች
ብቁ፣ በጣም ብቁ። እና በመንገድ ላይ በ PostgreSQL 10 ውስጥ የመከፋፈያ ዘዴን የበለጠ ወይም ያነሰ ለመቆጣጠር እንደቻልን ከግምት ውስጥ በማስገባት - ጥሩ ውጤት።
የግጥም መፍጨት
የተሻለ ነገር ማድረግ ይቻል ይሆን - አዎ፣ ትችላለህ!ይህንን ለማድረግ MATERIALIZED እይታን መጠቀም ያስፈልግዎታል።
በቁሳቁስ የተሰራ እይታ LASERMARK_VIEW ፍጠር
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 ;
እንደገና ጥያቄውን እንደገና እንጽፋለን-
ቁሳዊ እይታን በመጠቀም መጠይቅ
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';
እና ሌላ ውጤት እናገኛለን-
ነበር
ወጭ: 502 997.55
የማስፈጸሚያ ጊዜ: 505 ሰከንድ
ሆኗል
ወጭ: 42 481.16
የማስፈጸሚያ ጊዜ፡- 43 ሰከንዶች.
ምንም እንኳን እርግጥ ነው፣ እንዲህ ያለው ተስፋ ሰጪ ውጤት አታላይ ነው፤ ሐሳቦች መታደስ አለባቸው። ስለዚህ ውሂብ ለመቀበል አጠቃላይ ጊዜ ብዙም አይረዳም። ግን እንደ ሙከራ በጣም አስደሳች ነው።
በእውነቱ ፣ እንደ ተለወጠ ፣ እንደገና አመሰግናለሁ እና ሀብሩ!-
ከቃል በኋላ
ስለዚህ ደንበኛው ረክቷል. እና አስፈላጊ ሁኔታውን መጠቀም.
አዲስ ተግባር: ለማጥለቅ እና ለማስፋት ምን ይዘው መምጣት ይችላሉ?
እና ከዚያ አስታውሳለሁ - ወንዶች ፣ የእኛን የ PostgreSQL የውሂብ ጎታዎች ክትትል የለንም።
በAWS ላይ በCloud Watch መልክ አሁንም የተወሰነ ክትትል አለ። ግን ይህ ክትትል ለዲቢኤ ያለው ጥቅም ምንድነው? በአጠቃላይ, በተግባር ምንም.
ለራስዎ ጠቃሚ እና አስደሳች ነገር ለማድረግ እድል ካሎት, ይህንን እድል መጠቀም አይችሉም ...
ለ
ወደ በጣም አስደሳች ክፍል የምንመጣው በዚህ መንገድ ነው-
ታህሳስ 3 ቀን 2018 ዓ.ም.
የPostgreSQL መጠይቆችን አፈጻጸም ለመከታተል በሚገኙ አቅም ላይ ምርምር ለመጀመር ውሳኔ ማድረግ።
ግን ያ ፈጽሞ የተለየ ታሪክ ነው።
ይቀጥላል…
ምንጭ: hab.com