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InnoDBだってシュッと全文検索したい!
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Rikito Taniguchi
January 11, 2016
Programming
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InnoDBだってシュッと全文検索したい!
Rikito Taniguchi
January 11, 2016
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Transcript
InnoDBͩͬͯγϡοͱ શจݕࡧ͍ͨ͠ʂ 2016/01/11 (݄) ୈೋճ CAMPHOR- × KMC ߹ಉ LTେձ
͜Μʹͪʂ ɾ@tanishiking ɾژେֶֶ෦ใֶՊ B3 ɾڈͷ4݄͙Β͍͔Β CAMPHOR- ɾDBͱ͔ʹڵຯ͋Δ(Ͱ͖Δͱݴͬͯͳ͍)
EXPLAIN ͯ͠·͔͢ʁ
SELECT * FROM table WHERE text LIKE ‘%foo%’;
SELECT * FROM table WHERE text LIKE ‘%foo%’; ී௨ͷΠϯσοΫεͩͱLIKEݕࡧલํҰக Ͱͳ͍ͱΠϯσοΫε͕༻͞Εͳ͍
͔ͳ͍͠
ͳΒ શจݕࡧͩʂ
શจݕࡧΤϯδϯͱ͔͍Ζ͍Ζ ͋Δ͚Ͳڥͱͱͷ͑Δͷେม ࠓ͋ΔڥͰεοͱ શจݕࡧ͍ͨ͠
MySQL 5.6.4 ͔Β ϑϧςΩετΠ ϯσοΫε͕ InnoDB Ͱ͑ Δʂ
MySQL 5.6.4 ͔Β ϑϧςΩετΠ ϯσοΫε͕ InnoDB Ͱ͑ Δʂ ※ͨͩ͠ຊޠͷΑ͏ͳݸʑͷ୯ޠʹ۠Γจࣈ͕ͳ͍ݴޠαϙʔτ͠ͳ͍ͷͱ͢Δ
MySQL 5.6.4 ͔Β ϑϧςΩετΠ ϯσοΫε͕ InnoDB Ͱ͑ Δʂ ※ͨͩ͠ຊޠͷΑ͏ͳݸʑͷ୯ޠʹ۠Γจࣈ͕ͳ͍ݴޠαϙʔτ͠ͳ͍ͷͱ͢Δ Ͳ͏͍͏͜ͱʁ
ຊޠΛ۠ΔͨΊʹʁ mecab ͢ͷ͏ͪ ͢ ໊ࢺ,Ұൠ,*,*,*,*,͢,εϞϞ,εϞϞ ॿࢺ,ॿࢺ,*,*,*,*,,Ϟ,Ϟ ໊ࢺ,Ұൠ,*,*,*,*,,ϞϞ,ϞϞ
ॿࢺ,ॿࢺ,*,*,*,*,,Ϟ,Ϟ ໊ࢺ,Ұൠ,*,*,*,*,,ϞϞ,ϞϞ ͷ ॿࢺ,࿈ମԽ,*,*,*,*,ͷ,ϊ,ϊ ͏ͪ ໊ࢺ,ඇཱࣗ,෭ࢺՄೳ,*,*,*,͏ͪ,ν,ν ͔ͪॻ͖
ຊޠΛ۠ΔͨΊʹʁ ngram ςΩετΛnจࣈ͝ͱʹ۠Δ bigram (n = 2) ͳΒ ͜Μʹͪ ↓
͜Μ, Μʹ, ʹͪ. ͪ
͘…ۭനͰ۠ΒΕͨ จষ ͍͚ΔΜͰ͠ΐ…???
CREATE TABLE `test` ( `id` AUTO_INCREMENT NOT NULL PRIMARY KEY,
`text` varchar(255) NOT NULL, FULLTEXT KEY `ngram_idx` (`text`) ) Engine=InnoDB DEFAULT CHARSET=utf-8; INSERT INTO `test` (`text`) VALUES ( “͢ɹɹɹɹɹͷɹ͏ͪ” ); INSERT INTO `test` (`text`) VALUES ( “͜ΜɹΜʹɹʹͪɹͪ” );
҆৺ͯ͠ ͍ͩ͘͞ :)
MySQL 5.7.6 ͔Βຊޠɾதࠃ ޠɾؖࠃޠͰར༻Մೳͳ ngram ύʔαʔ͕ InnoDB Ͱαϙʔτʂ μϯϩʔυ͢Εmecabύʔαʔ͑ΔΑʂ
CREATE TABLE `test` ( `id` AUTO_INCREMENT NOT NULL PRIMARY KEY,
`text` varchar(255) NOT NULL, FULLTEXT KEY `ngram_idx` (`text`) WITH PARSER ngram ) Engine=InnoDB DEFAULT CHARSET=utf-8; INSERT INTO `test` (`text`) VALUES ( “͢ͷ͏ͪ” ); ngram ͷ n ͷ ngram_token_size ͰઃఆՄೳ(σϑΥϧτ2)
SELECT * FROM table WHERE text LIKE ‘%foo%’;
SELECT * FROM table WHERE (MATCH (text) AGAINST (‘“foo”’ IN
BOOLEAN MODE));
ɾΠϯσοΫεαΠζ͕Ͱ͔͍ ɾΠϯσοΫε࡞ʹΊͬͪΌ͔͔࣌ؒΔ
MySQL + groonga = mroonga ଞͷબࢶ ߋ৽ɾૠೖੑೳ mroonga ͷ΄͏্͕ ݕࡧੑೳ
InnoDB fulltext index ͷ΄͏্͕ͬΆ͍
͋Γ͕ͱ͏ ͍͟͝·ͨ͠