MySQL & PostgreSQL - Speaker Deck

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ࠓͦ͜஌Γ͍ͨɺ 2େOSSσʔλϕʔεͷ MySQLͱPostgreSQLͷҧ͍ 044ίϯιʔγΞϜɹσʔλϕʔε෦ձɹओ࠵ηϛφʔ ʮΦʔϓϯιʔεσʔλϕʔεൺֱηϛφʔʯ

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What is it? MySQLͱPostgreSQL

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What is it? ࠓ͸2ڧ࣌୅ʢͦʔ͍ͩௐ΂

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What is it? ଟ෼ɺଟ͘ͷਓ͕࢖͍ͬͯΔ͸ͣ

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What is it? ·ͨ͜Ε͔Β࢖͏ػձ͕ଟʑ͋Δ͸ͣ

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What is it? ͦΜͳਓͨͪͷͨΊʹ ࠓ೔͔Β࢖͑Δϊ΢ϋ΢Λʂ

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What is it?

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͋͐͡Μͩ ̍ɹࣗݾ঺հ ̎ɹMySQL ̏ɹPostgreSQL ̐ɹ࣮ફͰϋϚΔ᠘ ̑ɹ·ͱΊ

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͋͐͡Μͩ ̍ɹࣗݾ঺հ ̎ɹMySQL ̏ɹPostgreSQL ̐ɹ࣮ફͰϋϚΔ᠘ ̑ɹ·ͱΊ

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ࣗݾ঺հ ໊લɿીࠜɹ૖େʢͦͶɹ͚ͨͱ΋ʣ ೥ྸɿ32ࡀʢࡾਓͷࢠڙ͕͍·͢ʣ ৬ۀɿηʔϧεΤϯδχΞ ॴଐɿגࣜձࣾ ͸ͯͳʢMackerelνʔϜʣ ɹɹɹ೔ຊPostgreSQLϢʔβձ ɹɹɹɹɹதࠃࢧ෦ ࢧ෦௕ ɹɹٕज़తʹ͸LLܥݴޠͱ͔RDB͕޷͖Ͱ͢

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Mackerel

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͸ͯͳ͸஥ؒΛ୳ͯ͠·͢ curl -sIL mackerel.io | grep engineer

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͋͐͡Μͩ ̍ɹࣗݾ঺հ ̎ɹMySQL ̏ɹPostgreSQL ̐ɹ࣮ફͰϋϚΔ᠘ ̑ɹ·ͱΊ

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MySQL .Z42-ͷಛ௃

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MySQL .Z42-ͷಛ௃ ˣ γϯϓϧɾߴ଎

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MySQL ߋ৽ܕΞʔΩςΫνϟ

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MySQL Ϩίʔυ Ϩίʔυ Ϩίʔυ ςʔϒϧ ςʔϒϧ Ϩίʔυ Ϩίʔυ Ϩίʔυ

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MySQL Ϩίʔυ Ϩίʔυ Ϩίʔυ ςʔϒϧ ςʔϒϧ Ϩίʔυ Ϩίʔυ Ϩίʔυ ಉ͡ߦΛߋ৽͢Δ

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MySQL ετϨʔδΤϯδϯ

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MySQL Ҿ༻ݩɿIUUQXXXTMJEFTIBSFOFUZPLVIBOEMFS !ZPLV͞Μɺ͍ͭ΋͋Γ͕ͱ͏͍͟͝·͢ɻ

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MySQL Ҿ༻ݩɿIUUQXXXTMJEFTIBSFOFUZPLVIBOEMFS !ZPLV͞Μɺ͍ͭ΋͋Γ͕ͱ͏͍͟͝·͢ɻ

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MySQL ετϨʔδΤϯδϯͱ͸

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MySQL ετϨʔδΤϯδϯͱ͸ ˣ େମσʔλͷಡΈॻ͖͢Δͱ͜Ζ

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MySQL ͔͜͜Βઌ͸*OOP%#ͷ࿩ .Z*4".ʁ஌Βͳ͍ࢠͰ͢Ͷʢന໨

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MySQL γϯϓϧɾߴ଎

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MySQL γϯϓϧɾߴ଎ ˣ */%&9͕ޮ͍͍ͯΔࣄ͕େࣄ

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MySQL #5SFF*/%&9

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MySQL #5SFF*/%&9 .Z42-͸جຊతʹ͜Ε ʢ35SFFʹ͍ͭͯ͸ࠓճ৮Εͳ͍ʣ

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MySQL Ҿ༻ݩɿIUUQTKBXJLJQFEJBPSHXJLJ##&$" ΢ΟΩϖσΟΞʮ#໦ʯ

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MySQL w 8)&3&۟Ͱ࢖͏ w (3061#:۟Ͱ΋࢖͏ w 03%&3#:۟Ͱ΋࢖͏

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MySQL w 8)&3&۟Ͱ࢖͏ w (3061#:۟Ͱ΋࢖͏ w 03%&3#:۟Ͱ΋࢖͏ ݕࡧશൠͰ࢖͏

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MySQL w ॏෳ͕গͳ͍΄͏͕ྑ͍ w ݁Ռ͕গͳ͍΄͏͕ྑ͍ w ར༻͢Δ*/%&9͸̍5"#-&ʹݸ

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MySQL w ॏෳ͕গͳ͍΄͏͕ྑ͍ w ݁Ռ͕গͳ͍΄͏͕ྑ͍ w ར༻͢Δ*/%&9͸̍5"#-&ʹݸ .Z42-ͷେ͖ͳಛ௃ͷҰͭ ʢΠϯσοΫε݁߹ʹ͍ͭͯ͸ࠓճ৮Εͳ͍ʣ

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MySQL ࣮ߦܭըΛݟΔ

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MySQL .Z42-8PSLCFODI

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MySQL .Z42-8PSLCFODI ˣ ແྉͰ࢖͑Δ

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MySQL

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MySQL 0SBDMFΞΧ΢ϯτෆཁʂʂ

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࣮ߦܭը CREATE TABLE `demo`.ùsers` ( ìd` INT NOT NULL AUTO_INCREMENT COMMENT '', `name` VARCHAR(45) NOT NULL COMMENT '', àge` INT NOT NULL COMMENT '', `created` DATETIME NOT NULL DEFAULT NOW () COMMENT '', PRIMARY KEY (ìd`) COMMENT '' ); ——શ݅Λબ୒͢ΔͷͰςʔϒϧεΩϟϯ SELECT * FROM demo.users; ——PRIMARY KEYʢINDEXʣΛར༻ͨ͠ྫ SELECT * FROM demo.users WHERE id > 100; ——INDEX͕ແ͍ͷͰςʔϒϧεΩϟϯ SELECT * FROM demo.users WHERE age > 20;

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MySQL

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MySQL

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MySQL αϒΫΤϦͱ૬ؔαϒΫΤϦ

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αϒΫΤϦ —— INDEXͱͯ͠PRIMARY KEY͕ޮ͍͍ͯΔ SELECT * FROM users WHERE id < 1000 AND id > 800 —— 1ճ͔࣮͠ߦ͞Εͳ͍ SELECT * FROM (SELECT * FROM users WHERE id < 1000 AND id > 800) AS dummy

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MySQL

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૬ؔαϒΫΤϦ ——஗͍૬ؔαϒΫΤϦ SELECT * FROM users WHERE age IN (SELECT age FROM users WHERE id BETWEEN 10 AND 100000)

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MySQL

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MySQL .Z42-͔Β."5&3*"-*;&%ʹ มΘΓɺ+0*/ͷΑ͏ͳڍಈʹͳͬͨ ੲΑΓૣ͘ͳͬͨ

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૬ؔαϒΫΤϦ ——INDEX͕ར༻Ͱ͖Ε͹૬ؔαϒΫΤϦͰ΋଎͍ SELECT * FROM users WHERE created = '2016-02-27 04:31:32' AND id IN (SELECT id FROM users WHERE id BETWEEN 10 AND 100000)

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MySQL

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MySQL ૬ؔαϒΫΤϦ͸஗͍ ৔߹͕ଟ͍

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MySQL ૬ؔαϒΫΤϦ͸஗͍ ˣ +0*/ʹॻ͖׵͑Δ

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JOIN SELECT * FROM users INNER JOIN users AS tmp ON tmp.id = users.id AND tmp.id BETWEEN 10 AND 100000 WHERE users.created = '2016-02-27 04:31:32'

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MySQL

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MySQL +0*/͸ֻ͚ࢉ

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MySQL +0*/͸ֻ͚ࢉ ˣ ߦ☓ߦ͸ߦ

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MySQL .Z42-ʹ͸ +0*/ͷΞϧΰϦζϜ͸Ұ͔ͭ͠ͳ͍

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MySQL .Z42-ʹ͸ +0*/ͷΞϧΰϦζϜ͸Ұ͔ͭ͠ͳ͍ ܾͯ͠ಘҙͳΘ͚Ͱ͸ແ͍ +0*/͸ϋΠίετͳΫΤϦ

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MySQL w ग़དྷΔ͚ͩখ͔ͯ͘͞͠Β+0*/ w ෆཁͳ+0*/͸ආ͚Δ w */%&9Λར༻ͨ͠+0*/Λ͢Δ

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MySQL γϯϓϧɾߴ଎

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MySQL γϯϓϧɾߴ଎ ˣ ೉͍͠ࣄΛ͠ͳ͍ ઃܭྗ͕ॏཁ

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͋͐͡Μͩ ̍ɹࣗݾ঺հ ̎ɹMySQL ̏ɹPostgreSQL ̐ɹ࣮ફͰϋϚΔҧ͍ ̑ɹ·ͱΊ

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PostgreSQL 1PTUHSF42-ͷಛ௃

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PostgreSQL 1PTUHSF42-ͷಛ௃ ˣ ߴػೳ

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PostgreSQL ௥هܕΞʔΩςΫνϟ

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PostgreSQL Ϩίʔυ Ϩίʔυ Ϩίʔυ ςʔϒϧ ςʔϒϧ Ϩίʔυ Ϩίʔυ Ϩίʔυ Ϩίʔυ

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PostgreSQL Ϩίʔυ Ϩίʔυ Ϩίʔυ ςʔϒϧ ςʔϒϧ Ϩίʔυ Ϩίʔυ Ϩίʔυ Ϩίʔυ ࢀরΛ֎͢

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PostgreSQL Ϩίʔυ Ϩίʔυ Ϩίʔυ ςʔϒϧ ςʔϒϧ Ϩίʔυ Ϩίʔυ Ϩίʔυ Ϩίʔυ ৽ͨʹมߋ෼Λ௥Ճ͢Δ

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PostgreSQL ͭ·Γɺߋ৽͸.Z42-ΑΓෆར ʢ%&-&5&͸.Z42-΋ࣅͨΑ͏ͳࣄͯ͠Δʣ

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PostgreSQL ͔͠͠ɺখ೉͍͜͠ͱ͸ಘҙ

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PostgreSQL w*/%&9͸ෳ਺ݸ࢖͑Δ wͦ΋ͦ΋*/%&9ͷछྨ͕୔ࢁ͋Δ w૬ؔαϒΫΤϦ΋଎͍ w+0*/ͷΞϧΰϦζϜ΋ෳ਺͋Δ

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PostgreSQL w*/%&9͸ෳ਺ݸ࢖͑Δ wͦ΋ͦ΋*/%&9ͷछྨ͕୔ࢁ͋Δ w૬ؔαϒΫΤϦ΋଎͍ w+0*/ͷΞϧΰϦζϜ΋ෳ਺͋Δ ͭͷΫΤϦ಺Ͱෳ਺࢖͑Δ

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PostgreSQL w*/%&9͸ෳ਺ݸ࢖͑Δ wͦ΋ͦ΋*/%&9ͷछྨ͕୔ࢁ͋Δ w૬ؔαϒΫΤϦ΋଎͍ w+0*/ͷΞϧΰϦζϜ΋ෳ਺͋Δ #USFFɺ(*/ɺࣜ*/%&9ͳͲγʔϯʹ߹Θͤͯ ෳ਺ͷ*/%&9Λར༻Ͱ͖Δ

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PostgreSQL w*/%&9͸ෳ਺ݸ࢖͑Δ wͦ΋ͦ΋*/%&9ͷछྨ͕୔ࢁ͋Δ w૬ؔαϒΫΤϦ΋଎͍ w+0*/ͷΞϧΰϦζϜ΋ෳ਺͋Δ ࢖͑Δ42-ͷߏจ΋ଟ͍ ྫ͑͹΢Πϯυ΢ؔ਺ͳͲ

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PostgreSQL w*/%&9͸ෳ਺ݸ࢖͑Δ wͦ΋ͦ΋*/%&9ͷछྨ͕୔ࢁ͋Δ w૬ؔαϒΫΤϦ΋଎͍ w+0*/ͷΞϧΰϦζϜ΋ෳ਺͋Δ /FTUFE-PPQ+PJO 4PSU.FSHF+PJO )BTI+PJO

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ෳ਺ར༻ͨ͠INDEX CREATE TABLE public.users ( id integer NOT NULL DEFAULT nextval('users_id_seq'::regclass), name text NOT NULL, age integer NOT NULL, created timestamp without time zone NOT NULL DEFAULT now(), CONSTRAINT users_pkey PRIMARY KEY (id)); CREATE INDEX users_created_idx ON public.users USING tree (created); ——idͱcreatedͷINDEXΛར༻͢Δ SELECT * FROM users WHERE id < 100 AND created < '2016-02-27 05:41:28';

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PostgreSQL

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PostgreSQL

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ࣜINDEX ——ࣜINDEXΛ࡞੒ CREATE INDEX test_idx ON users (substr(name,10,12)); ——ࣜͷ݁ՌͰINDEX͕ޮ͘ SELECT name FROM users WHERE substr(name,10,12) = '10'

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PostgreSQL

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PostgreSQL

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૬ؔαϒΫΤϦ SELECT * FROM users WHERE age IN (SELECT age FROM users WHERE id BETWEEN 10 AND 100000)

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PostgreSQL

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PostgreSQL

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PostgreSQL ΦϓςΟϚΠβ͕ αϒΫΤϦΛ+0*/ʹॻ͖׵͑ͯΔ

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૬ؔαϒΫΤϦ ——INDEXΛར༻ͨ͠αϒΫΤϦ SELECT * FROM users WHERE id IN (SELECT id FROM users WHERE id BETWEEN 10 AND 100000)

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PostgreSQL ΦϓςΟϚΠβ͕+0*/ʹʢ͈́

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૬ؔαϒΫΤϦ ——σϞͰINDEXΛ࢖ͬͯ͘Εͳ͍ͷͰINDEXΛ༏ઌతʹར༻͢ΔΑ͏ʹࢦఆ SET ENABLE_SEQSCAN=OFF; SELECT * FROM users WHERE id IN (SELECT id FROM users WHERE id BETWEEN 10 AND 100000)

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PostgreSQL

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PostgreSQL

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PostgreSQL 1PTUHSF42-ͷ૬ؔαϒΫΤϦ͸ ൺֱత଎͍

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΢Πϯυ΢ؔ਺ SELECT rank() OVER (PARTITION BY age ORDER BY id) , * FROM users WHERE age BETWEEN 10 AND 30 LIMIT 100

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PostgreSQL

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PostgreSQL

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PostgreSQL ෳࡶͳूܭ͸ಘҙ

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PostgreSQL ΢Πϯυ΢ؔ਺ʹ͍ͭͯ ߹ΘͤͯಡΉͱྑ͍ࢿྉ 8FCΤϯδχΞ͕1PTUHSF42-ΛબͿͭͷཧ༝ IUUQXXXTMJEFTIBSFOFU4PVEBJ4POFXFCQPTUHSFTRM

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PostgreSQL ෳࡶͳूܭ͸ಘҙ ˣ Ͱ΋3%#ͷجຊ͸.Z42-ͱҰॹ

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PostgreSQL ෳࡶͳूܭ͸ಘҙ ˣ Ͱ΋3%#ͷجຊ͸.Z42-ͱҰॹ ਖ਼نԽ͕ॏཁ */%&9Λར༻͠ͳ͍ͱ஗͍ +0*/͸ϋΠίετͳΫΤϦ ࣮ߦܭը͸ݟΕΔΑ͏ʹͳΖ͏ʂ

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͋͐͡Μͩ ̍ɹࣗݾ঺հ ̎ɹMySQL ̏ɹPostgreSQL ̐ɹ࣮ફͰϋϚΔ᠘ ̑ɹ·ͱΊ

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࣮ફͰϋϚΔ᠘ աڈͷ৘ใʢϊΠζʣ

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࣮ફͰϋϚΔ᠘ աڈͷ৘ใʢϊΠζʣ ˣ (PPHMFݕࡧͷݹ͍هࣄ΍ ޱ఻ʹ࿭Θ͞ΕΔ

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࣮ફͰϋϚΔ᠘ աڈͷ৘ใʢϊΠζʣ ˣ (PPHMFݕࡧͷݹ͍هࣄ΍ ޱ఻ʹ࿭Θ͞ΕΔ 3%#͕ۤखͳͳઌഐ΍্͕࢘ ෇͍͕ͨ࣌ͱͯ΋ةݥ

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࣮ફͰϋϚΔ᠘ w"-5&3จͰϩοΫΛऔΔʢ.Z42-ʣ w7"$66.͸खಈʢ1PTUHSF42-ʣ

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࣮ફͰϋϚΔ᠘ w"-5&3จͰϩοΫΛऔΔʢ.Z42-ʣ w7"$66.͸खಈʢ1PTUHSF42-ʣ .Z42-͔ΒΦϯϥΠϯ "-5&3จΛαϙʔτ

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࣮ફͰϋϚΔ᠘ w"-5&3จͰϩοΫΛऔΔʢ.Z42-ʣ w7"$66.͸खಈʢ1PTUHSF42-ʣ 1PTUHSF42-͔Β "VUP7"$66.Λαϙʔτ

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࣮ફͰϋϚΔ᠘ ࣗ෼ͷ࢖͍ͬͯΔόʔδϣϯΛ ͔ͬ͠Γ֬ೝ͢Δ͜ͱ

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࣮ફͰϋϚΔ᠘ ग़དྷΔ͚ͩ৽͍͠όʔδϣϯ͕ྑ͍ ϝδϟʔόʔδϣϯʹؔͯ͠͸ ೥ޙ͙Β͍ͷόʔδϣϯ͕͍͍ײ͡

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࣮ફͰϋϚΔ᠘ ৽ػೳΛ࢖͏

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࣮ફͰϋϚΔ᠘ ৽ػೳΛ࢖͏ ˣ 3%#ͷ৽ػೳ͸஍ཕʢόάʣΛ ౿Ή֮ޛ͕ඞཁ

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࣮ફͰϋϚΔ᠘ ৽ػೳΛ࢖͏ ˣ 3%#ͷ৽ػೳ͸஍ཕʢόάʣΛ ౿Ή֮ޛ͕ඞཁ خʑͱͯ͠஍ཕΛ౿Έൈ͘Α͏ʹͳͬͨΒ ͦΕ͸Ұྲྀͷূʢଟ෼

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࣮ફͰϋϚΔ᠘ ࢥ͍ࠐΈ

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࣮ફͰϋϚΔ᠘ ࢥ͍ࠐΈ ˣ ޓ׵ੑͷແ͍มߋͰ ΧδϡΞϧʹࢮ͵

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࣮ફͰϋϚΔ᠘ ࢥ͍ࠐΈ ˣ ޓ׵ੑͷແ͍มߋͰ ΧδϡΞϧʹࢮ͵ όʔδϣϯҧ͍΍ҧ͏%#Λ ࢖ͬͨ࣌ʹΑ͘ൃੜ͢Δ

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࣮ફͰϋϚΔ᠘ ֎෦Ωʔ੍໿ͷҧ͍

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࣮ફͰϋϚΔ᠘ .Z42-͸֎෦Ωʔ੍໿ͷ ਌ʹ΋ࢠʹ΋*/%&9Λ࡞Δ

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࣮ફͰϋϚΔ᠘ 1PTUHSF42-͸֎෦Ωʔ੍໿ʹΑΔ */%&9Λ࡞Βͳ͍

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࣮ફͰϋϚΔ᠘ 1PTUHSF42-͸ */%&9Λ࡞Βͳ͍ Ϛελʔදଆʹ͸ϢχʔΫ੍໿͕ඞਢ ϢχʔΫ੍໿ΛϢχʔΫ*/%&9Λੜ੒͢Δ ͔͠͠ࢠଆ͸*/%&9͕͋Δͱ͸ݶΒͳ͍

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࣮ફͰϋϚΔ᠘ τϥϯβΫγϣϯ෼཭Ϩϕϧ ໊લ ෼཭Ϩϕϧ આ໌ 4&3*"-*;"#-& ͍ͭ͞Α ௚ྻతʹॲཧ 3&1&"5"#-&3&"% ڧ͍ ಡΈऔΓର৅ͷσʔλ ΛৗʹಡΈऔΔ 3&"%$0..*55&% ·͊·ڧ͍ ֬ఆͨ͠࠷৽σʔλΛ ৗʹಡΈऔΔ 3&"% 6/$0..*55&% ऑ͍ ଞͷॲཧʹΑͬͯߦΘ Ε͍ͯΔɺॻ͖͔͚ͷ σʔλ·ͰಡΈऔΔɻ .Z42-ͷσϑΥϧτ͸͜͜

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࣮ફͰϋϚΔ᠘ wυΩϡϝϯτΛݟΔ w࣮ߦܭըΛݟΔ wਪଌΑΓ΋ܭଌ

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࣮ફͰϋϚΔ᠘ %#ͷ໰୊͸๨Εͨࠒʹ΍ͬͯ͘Δ

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