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[JTF2021] 結局インデックスってなんなんですか？/lets-learn-about-b...
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hassaku63
July 18, 2021
Technology
1
2.5k
[JTF2021] 結局インデックスってなんなんですか？/lets-learn-about-b-tree-index
JTF2021 登壇資料。
登壇後記としてレポート記事書きました。
https://blog.serverworks.co.jp/2021/07/19/145409
hassaku63
July 18, 2021
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Transcript
݁ہΠϯσοΫεͬͯͳΜͳΜͰ͔͢ʁ 1PTUHSF42-ͷΈ͔ΒΠϯσοΫεͷཧղΛਂΊΔ +VMZ5FDI'FTUB !IBTTBLV
4QFBLFS IBTTBLV $PSQPSBUF&OHJOFFSBU4FSWFSXPSLT$P -UE 5XJUUFS!IBTTBLV@ (JU)VCIBTTBLV
4QFBLFS w 4UFQ'VODUJPOT -BNCEB w 4FSWFSMFTT'SBNFXPSL w 1ZUIPO w 4BMFTGPSDF
w ۀϑϩʔվળʢόοΫΦϑΟεܥத৺ʣ
ͳͥɺࠓ͜͜ʹ͍Δͷ͔ w ʮશવΘ͔Βͳ͍ɻԶͨͪงғؾͰʢུʣʯঢ়ଶΛগ͠Ͱ͍ͨ͠ w ֓ཁ͘Β͍ͬͯΔͭΓͰ͍Δ͚ΕͲʜ w ৗۀͰ3%#ͱͷ͕গͳ͍ w ͕ࣗࣗʮࠓ͞Βฉ͚ͳ͍ʯͱࢥͬͯΔωλΛΞτϓοτ͔ͨͬͨ͠ w
ಉؔ͡৺Λ࣋ͭਓ͕Կਓ͔͍ΔͷͰʁ w ͋ΘΑ͘ποίϛΛଷ͍ͨ͠ w ৲ʹՐΛ͚ͭͳ͍ͱษڧ͕ਐ·ͳ͍ʜ
͓͢͠Δ͜ͱʗ͠ͳ͍͜ͱ w ͢͜ͱ w ΠϯσοΫεΛར༻͢ΔϞνϕͷ͓͞Β͍ͱɺ#5SFFͷجຊݪཧ w ΠϯσοΫε͕ػೳ͠ͳ͍έʔε w 1PTUHSF42-ͷΠϯσοΫεʗςʔϒϧͷϑΝΠϧߏ w
͞ͳ͍͜ͱ w #5SFFҎ֎ͷΠϯσοΫε w ෳ߹ΠϯσοΫε w +PJO͕བྷΉΫΤϦ w ΫΤϦΦϓςΟϚΠβ
ΠϯσοΫεͷجຊ
ͳͥΠϯσοΫεΛ͏ͷ͔ ʮૣ͘ʯσʔλʹΞΫηε͢Δ
ͳͥΠϯσοΫεΛ͏ͷ͔ ʮૣ͘ʯσʔλʹΞΫηε͢Δ w Կͱൺͯʁ w Ͳ͏ͯ͠ૣ͘ͳΔʁ
ͳͥΠϯσοΫεΛ͏ͷ͔ ʮૣ͘ʯσʔλʹΞΫηε͢Δ w ԿͱൺͯʁɹˠɹϑϧεΩϟϯ w Ͳ͏ͯ͠ૣ͘ͳΔʁɹˠɹΞΫηεͷํ๏
ʮૣ͘ʯͳΔݪཧ JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF
ʮૣ͘ʯͳΔݪཧ &YBNQMF6TFDBTF ҙͷϢʔβʔΛJEOBNFͰݕࡧ͍ͨ͠ &YBNQMF6TFDBTF ྸ͕/ࡀະຬͷϢʔβʔΛநग़͍ͨ͠ JE
OBNF BHF TFY BMJDF GFNBMF CPC GFNBMF DIBSMJF NBMF [PF GFNBMF
ʮૣ͘ʯͳΔݪཧ ϑΝΠϧͷ୯७ࠪ ɾ݅ಡΈࠐΜͰɺݕࡧ݅ͱর߹ ɾϨίʔυͷ͚݅ͩ܁Γฦ͢ JE OBNF BHF TFY
BMJDF GFNBMF CPC GFNBMF DIBSMJF NBMF [PF GFNBMF
ʮૣ͘ʯͳΔݪཧ ϑΝΠϧͷ୯७ࠪ ɾ݅ಡΈࠐΜͰɺݕࡧ݅ͱর߹ ɾϨίʔυͷ͚݅ͩ܁Γฦ͢ JE OBNF BHF TFY
BMJDF GFNBMF CPC GFNBMF DIBSMJF NBMF [PF GFNBMF
ʮૣ͘ʯͳΔݪཧ ϑΝΠϧͷ୯७ࠪ ɾ݅ಡΈࠐΜͰɺݕࡧ݅ͱর߹ ɾϨίʔυͷ͚݅ͩ܁Γฦ͢ JE OBNF BHF TFY
BMJDF GFNBMF CPC GFNBMF DIBSMJF NBMF [PF GFNBMF
ʮૣ͘ʯͳΔݪཧ ϑΝΠϧͷ୯७ࠪ ɾ݅ಡΈࠐΜͰɺݕࡧ݅ͱর߹ ɾϨίʔυͷ͚݅ͩ܁Γฦ͢ JE OBNF BHF TFY
BMJDF GFNBMF CPC GFNBMF DIBSMJF NBMF [PF GFNBMF
ʮૣ͘ʯͳΔݪཧ ϑΝΠϧͷ୯७ࠪ ɾ݅ಡΈࠐΜͰɺݕࡧ݅ͱর߹ ɾϨίʔυͷ͚݅ͩ܁Γฦ͢ JE OBNF BHF TFY
BMJDF GFNBMF CPC GFNBMF DIBSMJF NBMF [PF GFNBMF
ʮૣ͘ʯͳΔݪཧ ϑΝΠϧͷ୯७ࠪ ɾ݅ಡΈࠐΜͰɺݕࡧ݅ͱর߹ ɾϨίʔυͷ͚݅ͩ܁Γฦ͢ JE OBNF BHF TFY
BMJDF GFNBMF CPC GFNBMF DIBSMJF NBMF [PF GFNBMF ܭࢉίετ ɾݕࡧɿϨίʔυ/ʹൺྫ͢Δ ɾσʔλՃɿϑΝΠϧͷඌʹ͚͢
ʮૣ͘ʯͳΔݪཧ ࡧҾͷಇ͖Λ͢Δϝλσʔλͷಋೖ ɾݕࡧଐੑͰιʔτࡁΈͷσʔλߏ ɾ࣮σʔλʹର͢ΔϙΠϯλʢϑΝΠϧʹ͓͚Δ ϨίʔυͷόΠτҐஔͷσʔλΛ࣋ͭʣ ɾϝλσʔλΛ্Լ͔ΒڬΈܸͪͯ͠ݕࡧ ɹɾڬΈܸͪͷൣғʹͳͬͨྻͷCZUFP⒎TFU ɹɹΛࢀর࣮ͯ͠σʔλΛݟʹߦ͘ JE
OBNF BHF TFY BMJDF GFNBMF CPC GFNBMF DIBSMJF NBMF [PF GFNBMF BHF CZUFP⒎TFU P⒎TFUPG JE ʜ ʜ ʜ
ʮૣ͘ʯͳΔݪཧ ࡧҾͷಇ͖Λ͢Δϝλσʔλͷಋೖ ɾݕࡧଐੑͰιʔτࡁΈͷσʔλߏ ɾ࣮σʔλʹର͢ΔϙΠϯλʢϑΝΠϧʹ͓͚Δ ϨίʔυͷόΠτҐஔͷσʔλΛ࣋ͭʣ ɾϝλσʔλΛ্Լ͔ΒڬΈܸͪͯ͠ݕࡧ ɹɾڬΈܸͪͷൣғʹͳͬͨྻͷCZUFP⒎TFU ɹɹΛࢀর࣮ͯ͠σʔλΛݟʹߦ͘ JE
OBNF BHF TFY BMJDF GFNBMF CPC GFNBMF DIBSMJF NBMF [PF GFNBMF BHF CZUFP⒎TFU P⒎TFUPG JE ʜ ʜ ʜ
ʮૣ͘ʯͳΔݪཧ JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF ܭࢉίετ ɾݕࡧ ɹɾϨίʔυ݅/ʹൺྫʢϑϧεΩϟϯΑΓϚγʣ ɹɾϚον͢ΔϨίʔυ͕ଟ͍߹ɾɾɾʁ ɾσʔλՃɿ ɹɾ࣮σʔλͷϑΝΠϧඌه ɹɾϝλσʔλͷهίετɾɾɾʁ BHF CZUFP⒎TFU P⒎TFUPG JE ʜ ʜ ʜ
ʮૣ͘ʯͳΔݪཧ BHF CZUFP⒎TFU P⒎TFUPG JE ʜ
ʜ ʜ P⒎TFU YYY BHF ͷσʔλ͕Ճ
ʮૣ͘ʯͳΔݪཧ BHF CZUFP⒎TFU P⒎TFUPG JE ʜ
ʜ ʜ P⒎TFU YYY BHF ͱͳΔߦΛ୳͢ BHF ͷσʔλ͕Ճ
ʮૣ͘ʯͳΔݪཧ BHF CZUFP⒎TFU P⒎TFUPG JE ʜ
ʜ ʜ P⒎TFU YYY BHF ͱͳΔߦΛ୳͢ BHF ͷσʔλ͕Ճ σʔλΛૠೖ
ʮૣ͘ʯͳΔݪཧ BHF CZUFP⒎TFU P⒎TFUPG JE ʜ
ʜ ʜ P⒎TFU YYY BHF ͱͳΔߦΛ୳͢ BHF ͷσʔλ͕Ճ σʔλΛૠೖ
ʮૣ͘ʯͳΔݪཧ BHF CZUFP⒎TFU P⒎TFUPG JE ʜ
ʜ ʜ P⒎TFU YYY BHF ͱͳΔߦΛ୳͢ BHF ͷσʔλ͕Ճ σʔλΛૠೖ ॱ൪ʹʮ୳͠ʯͨΒޮѱ͘ͳ͍ʁ ݕࡧʗߋ৽ͷͲͪΒʹӨڹ͕ग़Δ
ʮૣ͘ʯͳΔݪཧ BHF CZUFP⒎TFU P⒎TFUPG JE ʜ
ʜ ʜ P⒎TFU YYY ͍͔ͭ͘ͷϨϯδʹׂ͢Δ͜ͱͰݕࡧΛޮԽ͢Δ ɾݕࡧ͕ʮͲͷϨϯδʹॴଐ͢Δ͔ʯΛௐΔ ɹɾॴଐ͍ͯ͠ͳ͍ϨϯδͷࠪΛলུͰ͖Δ ɹɾϨίʔυΑΓɺϨϯδͷݸͷํ͕Δ͔ʹখ͍͞ FYBNQMF ԯ݅ͷϨίʔυΛԯͣͭݸͷϨϯδʹׂɻ ୯ҰͷͰҰகʢ͋Δ͍ൣғʣݕࡧ͢Δ߹ ˠݸͷϨϯδΛௐΔॲཧ ԯϨίʔυΛௐΔ Ϩϯδ Ϩϯδ Ϩϯδ
ʮૣ͘ʯͳΔݪཧ ͍͔ͭ͘ͷϨϯδʹׂ͢Δ͜ͱͰݕࡧΛޮԽ͢Δ ɾݕࡧ͕ʮͲͷϨϯδʹॴଐ͢Δ͔ʯΛௐΔ ɹɾॴଐ͍ͯ͠ͳ͍ϨϯδͷࠪΛলུͰ͖Δ ɹɾϨίʔυΑΓɺϨϯδͷݸͷํ͕Δ͔ʹখ͍͞ FYBNQMF ԯ݅ͷϨίʔυΛԯͣͭݸͷϨϯδʹׂɻ ୯ҰͷͰҰகʢ͋Δ͍ൣғʣݕࡧ͢Δ߹ ˠݸͷϨϯδΛௐΔॲཧ
ԯϨίʔυΛௐΔ Ϩϯδ Ϩϯδ Ϩϯδ ɾ ɾ ɾ ɾ ɾ ɾ Ϩϯδ ɾ ɾ ɾ ɾ ɾ ɾ
ʮૣ͘ʯͳΔݪཧ ͍͔ͭ͘ͷϨϯδʹׂ͢Δ͜ͱͰݕࡧΛޮԽ͢Δ ɾݕࡧ͕ʮͲͷϨϯδʹॴଐ͢Δ͔ʯΛௐΔ ɹɾॴଐ͍ͯ͠ͳ͍ϨϯδͷࠪΛলུͰ͖Δ ɹɾϨίʔυΑΓɺϨϯδͷݸͷํ͕Δ͔ʹখ͍͞ FYBNQMF ԯ݅ͷϨίʔυΛԯͣͭݸͷϨϯδʹׂɻ ୯ҰͷͰҰகʢ͋Δ͍ൣғʣݕࡧ͢Δ߹ ˠݸͷϨϯδΛௐΔॲཧ
ԯϨίʔυΛௐΔ Ϩϯδ Ϩϯδ Ϩϯδ ɾ ɾ ɾ ɾ ɾ ɾ Ϩϯδ Ϩϯδ Ϩϯδ ɾ ɾ ɾ ɾ ɾ ɾ
ʮૣ͘ʯͳΔݪཧ ͍͔ͭ͘ͷϨϯδʹׂ͢Δ͜ͱͰݕࡧΛޮԽ͢Δ ɾݕࡧ͕ʮͲͷϨϯδʹॴଐ͢Δ͔ʯΛௐΔ ɹɾॴଐ͍ͯ͠ͳ͍ϨϯδͷࠪΛলུͰ͖Δ ɹɾϨίʔυΑΓɺϨϯδͷݸͷํ͕Δ͔ʹখ͍͞ FYBNQMF ԯ݅ͷϨίʔυΛԯͣͭݸͷϨϯδʹׂɻ ୯ҰͷͰҰகʢ͋Δ͍ൣғʣݕࡧ͢Δ߹ ˠݸͷϨϯδΛௐΔॲཧ
ԯϨίʔυΛௐΔ Ϩϯδ Ϩϯδ Ϩϯδ ɾ ɾ ɾ ɾ ɾ ɾ Ϩϯδ Ϩϯδ Ϩϯδ Ϩϯδ ɾ ɾ ɾ ɾ ɾ ɾ
ʮૣ͘ʯͳΔݪཧ ͍͔ͭ͘ͷϨϯδʹׂ͢Δ͜ͱͰݕࡧΛޮԽ͢Δ ɾݕࡧ͕ʮͲͷϨϯδʹॴଐ͢Δ͔ʯΛௐΔ ɹɾॴଐ͍ͯ͠ͳ͍ϨϯδͷࠪΛলུͰ͖Δ ɹɾϨίʔυΑΓɺϨϯδͷݸͷํ͕Δ͔ʹখ͍͞ FYBNQMF ԯ݅ͷϨίʔυΛԯͣͭݸͷϨϯδʹׂɻ ୯ҰͷͰҰகʢ͋Δ͍ൣғʣݕࡧ͢Δ߹ ˠݸͷϨϯδΛௐΔॲཧ
ԯϨίʔυΛௐΔ Ϩϯδ Ϩϯδ Ϩϯδ ɾ ɾ ɾ ɾ ɾ ɾ Ϩϯδ Ϩϯδ Ϩϯδ Ϩϯδ Ϩϯδׂͯ͠ɺଟͷ͔Β ޮΑ͘ݕࡧͰ͖Δߏ ˠ#5SFF ɾ ɾ ɾ ɾ ɾ ɾ
খٳࢭ w ϑϧεΩϟϯͰݕࡧ͢ΔͱɺϨίʔυʹൺྫ͢Δݕࡧίετ͕͔͔Δʢγʔέ ϯγϟϧΞΫηεʣ w ݕࡧ༻ͷʮϝλσʔλʯΛಋೖ͠ɺ࣮σʔλͷݕࡧޮΛ্͢Δ w ݕࡧଐੑͰιʔτࡁΈͰɺରԠ͢Δ࣮σʔλͷϙΠϯλΛ࣋ͭσʔλߏ w ϥϯμϜΞΫηεΛޮ͔ͤΔ͜ͱͰݕࡧޮΛվળ͢Δ
w ϝλσʔλʢΠϯσοΫεʣࣗͷݕࡧޮԽ͢Δඞཁ͕͋Δ w Ϩϯδׂͯ͠ɺߏͷσʔλͱͯ͠ѻ͏ͱݕࡧޮ͕ྑ͍ˠ#5SFF
ʮૣ͘ʯͳΔݪཧʢ࠶ʣ JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF ܭࢉίετ ɾݕࡧ ɹɾϨίʔυ݅/ʹൺྫʢϑϧεΩϟϯΑΓϚγʣ ɹɾϚον͢ΔϨίʔυ͕ଟ͍߹ɾɾɾʁ ɾσʔλՃɿ ɹɾ࣮σʔλͷϑΝΠϧඌه ɹɾϝλσʔλͷํɾɾɾʁ BHF CZUFP⒎TFU P⒎TFUPG JE ʜ ʜ ʜ
ΠϯσοΫεΞΫηε JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF BHF CZUFP⒎TFU P⒎TFUPG JE P⒎TFUPG JE 2VFSZ lBHF z ΠϯσοΫεϑΝΠϧ σʔλϑΝΠϧ ʢ࣮σʔλʣ
ΠϯσοΫεΞΫηε JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF BHF CZUFP⒎TFU P⒎TFUPG JE P⒎TFUPG JE 2VFSZ lBHF z #USFFJOEFYΛݕࡧ
ΠϯσοΫεΞΫηε JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF BHF CZUFP⒎TFU P⒎TFUPG JE P⒎TFUPG JE 2VFSZ lBHF z #USFFJOEFYΛݕࡧ ΠϯσοΫε͕ࢦ͢ΦϑηοτͰ ࣮σʔλͷσʔλϑΝΠϧΛࢀর
ΠϯσοΫεΞΫηεϚον͢Δ݁Ռ͕ଟ͍߹ JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF BHF CZUFP⒎TFU P⒎TFUPG JE P⒎TFUPG JE 2VFSZ lBHF z
ΠϯσοΫεΞΫηεϚον͢Δ݁Ռ͕ଟ͍߹ JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF BHF CZUFP⒎TFU P⒎TFUPG JE P⒎TFUPG JE 2VFSZ lBHF z #USFFJOEFYΛݕࡧ
ΠϯσοΫεΞΫηεϚον͢Δ݁Ռ͕ଟ͍߹ JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF BHF CZUFP⒎TFU P⒎TFUPG JE P⒎TFUPG JE 2VFSZ lBHF z #USFFJOEFYΛݕࡧ ɾ ɾ ɾ ΠϯσοΫε͕ࢦ͢ΦϑηοτͰ ࣮σʔλͷσʔλϑΝΠϧΛࢀর ʢϚονͨ͠ճ͚ͩϥϯμϜΞΫηεʣ
ΠϯσοΫεΞΫηεϚον͢Δ݁Ռ͕ଟ͍߹ JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF BHF CZUFP⒎TFU P⒎TFUPG JE P⒎TFUPG JE 2VFSZ lBHF z #USFFJOEFYΛݕࡧ ɾ ɾ ɾ ΠϯσοΫε͕ࢦ͢ΦϑηοτͰ ࣮σʔλͷσʔλϑΝΠϧΛࢀর ʢϚονͨ͠ճ͚ͩϥϯμϜΞΫηεʣ ɹϑϧεΩϟϯΑΓޮѱ͘ͳ͍ʁ🤔🤔 ɹ
ΠϯσοΫεΞΫηεϚον͢Δ݁Ռ͕ଟ͍߹ JE OBNF BHF TFY BMJDF GFNBMF
CPC GFNBMF DIBSMJF NBMF [PF GFNBMF BHF CZUFP⒎TFU P⒎TFUPG JE P⒎TFUPG JE 2VFSZ lBHF z #USFFJOEFYΛݕࡧ ɾ ɾ ɾ ΠϯσοΫε͕ࢦ͢ΦϑηοτͰ ࣮σʔλͷσʔλϑΝΠϧΛࢀর ʢϚονͨ͠ճ͚ͩϥϯμϜΞΫηεʣ ɹϑϧεΩϟϯΑΓޮѱ͘ͳ͍ʁ🤔🤔 ɹΠϯσοΫεܦ༝Ͱݟʹߦ͚ͩ͘ɺΉ͠Ζखؒ૿͑ͯΔ
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1PTUHSF42-ͷΠϯσοΫεͱ σʔλϑΝΠϧͷߏ
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