{"id":93138,"date":"2020-09-03T01:42:51","date_gmt":"2020-09-02T23:42:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/awr-naskolko-ekzadatitsya-rabota-bazy-dannyh"},"modified":"2020-09-03T01:42:51","modified_gmt":"2020-09-02T23:42:51","slug":"awr-naskolko-ekzadatitsya-rabota-bazy-dannyh","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/awr-naskolko-ekzadatitsya-rabota-bazy-dannyh","title":{"rendered":"AWR: mennyire \"ex\u00e1datiz\u00e1lt\" az adatb\u00e1zis munk\u00e1ja?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ezzel a r\u00f6vid bejegyz\u00e9ssel szeretn\u00e9m eloszlatni egy f\u00e9lre\u00e9rt\u00e9st az AWR elemz\u00e9s\u00e9vel kapcsolatban, amely Oracle Exadata k\u00f6rnyezetben m\u0171k\u00f6d\u0151 adatb\u00e1zisokat \u00e9rint. K\u00f6zel 10 \u00e9ve folyamatosan tal\u00e1lkozom azzal a k\u00e9rd\u00e9ssel: mekkora szerepet j\u00e1tszik az Exadata szoftver a teljes\u00edtm\u00e9nyben? Vagy m\u00e1s szavakkal: mennyire 'exad\u00e1zt\u00f3l' f\u00fcgg az adott adatb\u00e1zis m\u0171k\u00f6d\u00e9se?<\/p>\n<p><img decoding=\"async\" alt=\"AWR: mennyire &quot;ex\u00e1datiz\u00e1lt&quot; az adatb\u00e1zis munk\u00e1ja?\" src=\"\/wp-content\/uploads\/2020\/09\/b0ca997a4bd415723ae56c183e2dd42f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Gyakran erre a helyes k\u00e9rd\u00e9sre, v\u00e9lem\u00e9nyem szerint, hib\u00e1s v\u00e1lasz \u00e9rkezik, amely az AWR statisztik\u00e1kra hivatkozik. Ezekben a rendszer v\u00e1rakoz\u00e1si idejeit \u00fagy \u00e9rtelmezik, mint a CPU id\u0151 \u00e9s a k\u00fcl\u00f6nb\u00f6z\u0151 oszt\u00e1lyok v\u00e1rakoz\u00e1si idej\u00e9nek \u00f6sszeg\u00e9t.<\/p>\n<p>Az Exadata megjelen\u00e9s\u00e9vel az AWR statisztik\u00e1kban specifikus rendszer v\u00e1rakoz\u00e1sok jelentek meg, amelyek az Exadata szoftver m\u0171k\u00f6d\u00e9s\u00e9vel kapcsolatosak. Ezek a v\u00e1rakoz\u00e1sok \u00e1ltal\u00e1ban 'cell' sz\u00f3val kezd\u0151dnek (a cella az Exadata t\u00e1rol\u00f3szerver), \u00e9s a leggyakoribbak k\u00f6z\u00f6tt tal\u00e1lhat\u00f3k a k\u00f6vetkez\u0151 nevek: 'cell smart table scan', 'cell multiblock physical read' \u00e9s 'cell single block physical read'.<\/p>\n<p>A legt\u00f6bb esetben az ilyen Exadata v\u00e1rakoz\u00e1sok ar\u00e1nya a v\u00e1laszid\u0151ben kicsi, ez\u00e9rt nem is ker\u00fclnek be a Top10 Foreground Events by Total Wait Time szekci\u00f3ba (ilyenkor a Foreground Wait Events r\u00e9szben kell \u0151ket keresni). Nagy nehezen tal\u00e1ltunk \u00fcgyfeleinkn\u00e9l egy napra vonatkoz\u00f3 AWR p\u00e9ld\u00e1t, ahol az Exadata v\u00e1rakoz\u00e1sok bejutottak a Top10 szekci\u00f3ba \u00e9s \u00f6sszesen k\u00f6r\u00fclbel\u00fcl 5%-ot tettek ki:<\/p>\n<p align=\"center\"><strong>Esem\u00e9ny<\/strong><\/p>\n<p align=\"center\"><strong>V\u00e1rakoz\u00e1sok<\/strong><\/p>\n<p align=\"center\"><strong>\u00d6sszes v\u00e1rakoz\u00e1si id\u0151 (sec)<\/strong><\/p>\n<p align=\"center\"><strong>\u00c1tlagos v\u00e1rakoz\u00e1s<\/strong><\/p>\n<p><strong>% DB id\u0151<\/strong><\/p>\n<p align=\"center\"><strong>V\u00e1rakoz\u00e1si oszt\u00e1ly<\/strong><\/p>\n<p>DB CPU<\/p>\n<p>              <\/p>\n<p align=\"right\">115.2K<\/p>\n<p>              <\/p>\n<p align=\"right\">70.4<\/p>\n<p>              <\/p>\n<p>SQL*Net             t\u00f6bb adat a dblinkb\u0151l<\/p>\n<p align=\"right\">670,196<\/p>\n<p align=\"right\">5471.5<\/p>\n<p align=\"right\">8.16ms<\/p>\n<p align=\"right\">3.3<\/p>\n<p>H\u00e1l\u00f3zat<\/p>\n<p>cell             single block physical read<\/p>\n<p align=\"right\">5,661,452<\/p>\n<p align=\"right\">3827.6<\/p>\n<p align=\"right\">676.07us<\/p>\n<p align=\"right\">2.3<\/p>\n<p>Felhaszn\u00e1l\u00f3i             I\/O<\/p>\n<p>Szinkron             ASM \u00fajraeloszt\u00e1s<\/p>\n<p align=\"right\">4,350,012<\/p>\n<p align=\"right\">3481.3<\/p>\n<p align=\"right\">800.30us<\/p>\n<p align=\"right\">2.1<\/p>\n<p>Egy\u00e9b<\/p>\n<p>cell             multiblock physical read<\/p>\n<p align=\"right\">759,885<\/p>\n<p align=\"right\">2252<\/p>\n<p align=\"right\">2.96ms<\/p>\n<p align=\"right\">1.4<\/p>\n<p>Felhaszn\u00e1l\u00f3i             I\/O<\/p>\n<p>k\u00f6zvetlen             \u00fatvonal olvas\u00e1s<\/p>\n<p align=\"right\">374,368<\/p>\n<p align=\"right\">1811.3<\/p>\n<p align=\"right\">4.84ms<\/p>\n<p align=\"right\">1.1<\/p>\n<p>Felhaszn\u00e1l\u00f3i             I\/O<\/p>\n<p>SQL*Net             \u00fczenet a dblinkb\u0151l<\/p>\n<p align=\"right\">7,983<\/p>\n<p align=\"right\">1725<\/p>\n<p align=\"right\">216.08ms<\/p>\n<p align=\"right\">1.1<\/p>\n<p>H\u00e1l\u00f3zat<\/p>\n<p>cell             smart table scan<\/p>\n<p align=\"right\">1,007,520<\/p>\n<p align=\"right\">1260.7<\/p>\n<p align=\"right\">1.25ms<\/p>\n<p align=\"right\">0.8<\/p>\n<p>Felhaszn\u00e1l\u00f3i             I\/O<\/p>\n<p>k\u00f6zvetlen             \u00fatvonal olvas\u00e1s ideiglenes<\/p>\n<p align=\"right\">520,211<\/p>\n<p align=\"right\">808.4<\/p>\n<p align=\"right\">1.55ms<\/p>\n<p align=\"right\">0.5<\/p>\n<p>Felhaszn\u00e1l\u00f3i             I\/O<\/p>\n<p>enq: TM \u2014 contention<\/p>\n<p align=\"right\">652<\/p>\n<p align=\"right\">795.8<\/p>\n<p align=\"right\">1220.55ms<\/p>\n<p align=\"right\">0.5<\/p>\n<p>Alkalmaz\u00e1s<\/p>\n<p>Az ilyen AWR statisztik\u00e1kb\u00f3l gyakran olyan k\u00f6vetkeztet\u00e9seket vonnak le:<\/p>\n<p> 1.&nbsp;Az Exadata var\u00e1zslat\u00e1nak hozz\u00e1j\u00e1rul\u00e1sa az adatb\u00e1zis teljes\u00edtm\u00e9ny\u00e9hez nem magas \u2014 5%-ot nem haladja meg, \u00e9s az adatb\u00e1zis \"exadataliz\u00e1l\u00f3d\u00e1sa\" gyenge.<\/p>\n<p> 2.&nbsp;Ha egy ilyen adatb\u00e1zist Exadata-r\u00f3l klasszikus \"szerver + t\u00f6mb\" architekt\u00far\u00e1ra helyez\u00fcnk \u00e1t, a teljes\u00edtm\u00e9ny nem v\u00e1ltozik sokat. Mert m\u00e9g ha ez a t\u00f6mb h\u00e1romszor lassabb is lenne, mint az Exadata t\u00e1rol\u00f3rendszere (ami a modern All Flash t\u00f6mb\u00f6k eset\u00e9ben aligha val\u00f3s), akkor az 5%-ot megszorozva h\u00e1rommal 15%-ra emelhetn\u00e9nk az I\/O v\u00e1rakoz\u00e1sok m\u00e9rt\u00e9k\u00e9t \u2014 ezt az adatb\u00e1zis biztosan elviseli!<\/p>\n<p>Mindk\u00e9t kimenet pontatlan, s\u0151t, torz\u00edtja az Exadata szoftverben rejl\u0151 \u00f6tlet meg\u00e9rt\u00e9s\u00e9t. Az Exadata nem csup\u00e1n gyors bemeneti-kimenetet biztos\u00edt, alapjaiban m\u00e1sk\u00e9nt m\u0171k\u00f6dik, mint a klasszikus \"szerver + t\u00e1rol\u00f3\" architekt\u00fara. Ha az adatb\u00e1zis megfelel\u0151en \"exadatis\u00e1l\u00f3dik\" \u2013 akkor a SQL-logika a t\u00e1rol\u00f3rendszerre ker\u00fcl \u00e1t. Storage <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/hu\/server\/\"   title=\"szerverek\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1899\">szerverek<\/a> K\u00fcl\u00f6nf\u00e9le speci\u00e1lis mechanizmusoknak k\u00f6sz\u00f6nhet\u0151en (els\u0151sorban Exadata Storage Indexek, de nem csak) maguk tal\u00e1lj\u00e1k meg a sz\u00fcks\u00e9ges adatokat, \u00e9s k\u00fcldik el azokat az DB szervereknek. Ezt el\u00e9g hat\u00e9konyan v\u00e9gzik, ez\u00e9rt az Exadata-jelleg\u0171 v\u00e1rakoz\u00e1sok ar\u00e1nya az \u00f6sszes v\u00e1laszid\u0151ben kicsi.&nbsp;<\/p>\n<p>Hogyan v\u00e1ltozik ez az ar\u00e1ny Exadata n\u00e9lk\u00fcl? Milyen hat\u00e1ssal lesz ez az adatb\u00e1zis teljes\u00edtm\u00e9ny\u00e9re? A legjobb v\u00e1laszokat a tesztel\u00e9s adja. P\u00e9ld\u00e1ul az \"cell smart table scan\" v\u00e1rakoz\u00e1s Exadata n\u00e9lk\u00fcl olyan neh\u00e9z Table Full Scan-n\u00e9 alakulhat, hogy a bemeneti-kimenet minden v\u00e1laszid\u0151t fel\u00f6lel, \u00e9s a teljes\u00edtm\u00e9ny dr\u00e1maian cs\u00f6kken. Ez\u00e9rt helytelen az AWR elemz\u00e9sekor a kiv\u00e1r\u00e1sok \u00f6sszes\u00edtett sz\u00e1zal\u00e9k\u00e1t az Exadata var\u00e1zs\u00e1nak hozz\u00e1j\u00e1rul\u00e1sak\u00e9nt sz\u00e1m\u00edtani, \u00e9s m\u00e9g ink\u00e1bb ezt a sz\u00e1zal\u00e9kot Exadata-n k\u00edv\u00fcli teljes\u00edtm\u00e9ny el\u0151rejelz\u00e9s\u00e9re haszn\u00e1lni. Ahhoz, hogy meg\u00e9rts\u00fck, mennyire \"exadatis\u00e1l\u00f3dik\" az adatb\u00e1zis m\u0171k\u00f6d\u00e9se, az AWR szekci\u00f3 \"Instance Activity Stats\" statisztik\u00e1it (ott sok statisztika tal\u00e1lhat\u00f3 besz\u00e9des nevekkel) kell tanulm\u00e1nyozni \u00e9s \u00f6sszehasonl\u00edtani egym\u00e1ssal.<\/p>\n<p>Ahhoz, hogy meg\u00e9rts\u00fck, hogyan fog teljes\u00edteni az adatb\u00e1zis Exadata n\u00e9lk\u00fcl, a legjobb, ha egy m\u00e1solatot k\u00e9sz\u00edt\u00fcnk a c\u00e9larchitekt\u00far\u00e1ra a ment\u00e9sb\u0151l, \u00e9s elemezz\u00fck ennek a m\u00e1solatnak a teljes\u00edtm\u00e9ny\u00e9t terhel\u00e9s alatt. Az Exadata tulajdonosainak \u00e1ltal\u00e1ban van lehet\u0151s\u00e9g\u00fck erre.<\/p>\n<p>Szerz\u0151:  <em>Alekszej Strucsenko, az Inf\u00f3system Jet DB r\u00e9szleg\u00e9nek vezet\u0151je<\/em><\/p>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/jetinfosystems\/blog\/517330\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u042d\u0442\u0438\u043c \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0438\u043c \u043f\u043e\u0441\u0442\u043e\u043c \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c \u0431\u044b \u0440\u0430\u0437\u0432\u0435\u044f\u0442\u044c \u043e\u0434\u043d\u043e \u043d\u0435\u0434\u043e\u0440\u0430\u0437\u0443\u043c\u0435\u043d\u0438\u0435, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0435 \u0441 \u0430\u043d\u0430\u043b\u0438\u0437\u043e\u043c AWR \u0431\u0430\u0437 \u0434\u0430\u043d\u043d\u044b\u0445, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0445 \u043d\u0430 Oracle Exadata. \u041f\u043e\u0447\u0442\u0438 10 \u043b\u0435\u0442 \u044f \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e \u0441\u0442\u0430\u043b\u043a\u0438\u0432\u0430\u044e\u0441\u044c \u0441 \u0432\u043e\u043f\u0440\u043e\u0441\u043e\u043c: \u043a\u0430\u043a\u043e\u0432 \u0432\u043a\u043b\u0430\u0434 Exadata Software \u0432 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c? \u0418\u043b\u0438 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043d\u043e\u0432\u043e\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0441\u043b\u043e\u0432: \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u00ab\u044d\u043a\u0437\u0430\u0434\u0430\u0442\u0438\u0442\u0441\u044f\u00bb \u0440\u0430\u0431\u043e\u0442\u0430 \u0442\u043e\u0439 \u0438\u043b\u0438 \u0438\u043d\u043e\u0439 \u0431\u0430\u0437\u044b \u0434\u0430\u043d\u043d\u044b\u0445? \u0427\u0430\u0441\u0442\u043e \u043d\u0430 \u044d\u0442\u043e\u0442 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u0439 \u0432\u043e\u043f\u0440\u043e\u0441, \u043d\u0430 \u043c\u043e\u0439 \u0432\u0437\u0433\u043b\u044f\u0434, \u0434\u0430\u0435\u0442\u0441\u044f \u043d\u0435\u0432\u0435\u0440\u043d\u044b\u0439 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":93139,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-93138","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u042d\u0442\u0438\u043c \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0438\u043c \u043f\u043e\u0441\u0442\u043e\u043c \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c \u0431\u044b \u0440\u0430\u0437\u0432\u0435\u044f\u0442\u044c \u043e\u0434\u043d\u043e \u043d\u0435\u0434\u043e\u0440\u0430\u0437\u0443\u043c\u0435\u043d\u0438\u0435, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0435 \u0441 \u0430\u043d\u0430\u043b\u0438\u0437\u043e\u043c AWR \u0431\u0430\u0437 \u0434\u0430\u043d\u043d\u044b\u0445, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0445 \u043d\u0430 Oracle Exadata.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/awr-naskolko-ekzadatitsya-rabota-bazy-dannyh\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"hu_HU\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47AWR: \u043d\u0430\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u00ab\u044d\u043a\u0437\u0430\u0434\u0430\u0442\u0438\u0442\u0441\u044f\u00bb \u0440\u0430\u0431\u043e\u0442\u0430 \u0431\u0430\u0437\u044b \u0434\u0430\u043d\u043d\u044b\u0445? 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