{"id":87814,"date":"2020-07-10T13:42:14","date_gmt":"2020-07-10T11:42:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/chto-luchshe-oracle-ili-redis-ili-kak-obosnovat-vybor-platformy"},"modified":"2020-07-10T13:42:14","modified_gmt":"2020-07-10T11:42:14","slug":"chto-luchshe-oracle-ili-redis-ili-kak-obosnovat-vybor-platformy","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/chto-luchshe-oracle-ili-redis-ili-kak-obosnovat-vybor-platformy","title":{"rendered":"Mis on parem \u2013 Oracle v\u00f5i Redis v\u00f5i Kuidas p\u00f5hjendada platvormi valikut","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<blockquote><p>\u2013 See, she said loudly without addressing anyone. \u2013 Can you believe it? It\u2019s written right here \u2013 the main goal of society is to extract profit in the interests of shareholders. Just think about it! They fear nothing!<\/p>\n<p><i>Juli Dubov, \u00abThe Lesser Evil\u00bb<\/i><\/p><\/blockquote>\n<p>\nUpon seeing such a headline, you've probably already decided that the article is either nonsense or a provocation. But don\u2019t rush to conclusions: employees of large corporations, especially those with state participation, frequently have to compare different platforms, including quite distinct ones \u2013 for example, those mentioned in the headline.<\/p>\n<p><img decoding=\"async\" alt=\"Mis on parem \u2013 Oracle v\u00f5i Redis v\u00f5i Kuidas p\u00f5hjendada platvormi valikut\" src=\"\/wp-content\/uploads\/2020\/07\/6b0c0a3a60794b2a9e98733e59eec6da.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOf course, no one compares DBMSs, as their strengths and weaknesses are well known. Usually, it\u2019s platforms that address a specific task that are compared. In this article, I will show the methodology used for this, using databases as a subject familiar to the readers of Habr. So,<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h4>Motivatsioon<\/h4>\n<p>\nKui alustate \u00f5ppeprojekti v\u00f5i hobi projekti, v\u00f5ivad platvormi valimise motivatsioonid olla v\u00e4ga erinevad: \"seda platvormi tunnen k\u00f5ige paremini\", \"see tundub p\u00f5nev\", \"siin on parim dokumentatsioon\"... \u00c4riettev\u00f5tte puhul on valikukriteerium \u00fcks: kui palju peab maksma ja mida selle eest saab.<\/p>\n<p>Muidugi tahaks maksta v\u00e4hem, kuid saada rohkem. Siiski tuleb otsustada, mis on olulisem \u2013 v\u00e4hem maksta v\u00f5i rohkem saada ning igale p\u00f5him\u00f5ttele omistada kaal. Oletame, et me hindame kvaliteetset lahendust rohkem kui odavat ning anname m\u00f5istele \"Hind\" kaalu 40% ning m\u00f5istele \"V\u00f5imalused\" 60%.<\/p>\n<p><img decoding=\"async\" alt=\"Mis on parem \u2013 Oracle v\u00f5i Redis v\u00f5i Kuidas p\u00f5hjendada platvormi valikut\" src=\"\/wp-content\/uploads\/2020\/07\/b3ba842198428e7de98f3b5a27591d43.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSuurtes ettev\u00f5tetes on tavaliselt k\u00f5ik vastupidi \u2013 hinna kaal ei lange alla 50% ja v\u00f5ib ulatuda isegi 60% v\u00f5i enamgi. Mudel n\u00e4itab, et k\u00f5igi vanemate s\u00f5lmede kogukaal peab olema 100%.<\/p>\n<h4>L\u00f5ike tingimused<\/h4>\n<p>\nVeebileht <noindex><a rel=\"nofollow\" href=\"https:\/\/db-engines.com\/\">db-engines.com<\/a><\/noindex> tuntud umbes 500 andmebaasi halduss\u00fcsteemi. Loomulikult, kui valida sihtplatvorm sellisest valikust, v\u00f5ib tulemusena olla \u00fclevaatlik artikkel, mitte kommertst\u00f6\u00f6. Valiku piiramiseks formuleeritakse v\u00e4listavad kriteeriumid, ja kui platvorm ei vasta nendele kriteeriumidele, siis ei vaatata seda.<\/p>\n<p>V\u00e4listavad kriteeriumid v\u00f5ivad puudutada tehnoloogilisi omadusi, n\u00e4iteks:<\/p>\n<ul>\n<li>ACID-garanteeringud;<\/li>\n<li>relatsiooniline andmemudel;<\/li>\n<li>SQL keele toetus (pange t\u00e4hele, et see ei ole sama, mis \"relatsiooniline mudel\");<\/li>\n<li>horisontaalse skaleerituse v\u00f5imalus.<\/li>\n<\/ul>\n<p>\nV\u00f5ivad olla ka \u00fcldise iseloomuga kriteeriumid:<\/p>\n<ul>\n<li>kaubanduslik toetus Venemaal;<\/li>\n<li>avatud l\u00e4htekood;<\/li>\n<li>platvormi olemasolu Kommunikatsiooniministeeriumi registris;<\/li>\n<li>platvormi olemasolu mingisuguses edetabelis (n\u00e4iteks db-engines.com esimese saja hulgas);<\/li>\n<li>ekspertide olemasolu turul (n\u00e4iteks platvormi nime otsingul CVs saidil hh.ru).<\/li>\n<\/ul>\n<p>\nL\u00f5puks v\u00f5ivad olla ka ettev\u00f5tte spetsiifilised kriteeriumid:<\/p>\n<ul>\n<li>spetsialistide olemasolu t\u00f6\u00f6tajate seas;<\/li>\n<li>\u00fchenduvus j\u00e4lgimiss\u00fcsteemiga X v\u00f5i varunduss\u00fcsteemiga Y, millele k\u00f5ik hooldus on seotud\u2026<\/li>\n<\/ul>\n<p>\nPeamine on, et oleks olemas v\u00e4listavad kriteeriumid. Vastasel juhul leiab alati m\u00f5ne eksperdi (v\u00f5i \u201eeksperdi\u201c), kellel on juhtkonna eriline usaldus, kes \u00fctleb: \u201eMiks te ei valinud platvormi Z? Ma tean, et see on parim.\u201c <\/p>\n<h4>Hinna hindamine<\/h4>\n<p>\nLahenduse maksumus koosneb ilmselgelt litsentside, teeninduse ja seadmete maksumusest.<\/p>\n<p>Kui s\u00fcsteemid on enam-v\u00e4hem samas klassis (n\u00e4iteks Microsoft SQL Server ja PostgreSQL), v\u00f5ib lihtsuse t\u00f5ttu arvata, et seadmete arv m\u00f5lema lahenduse jaoks on ligikaudu sama. See saves aega ja vaeva seadmete hindamisel. Kui aga tuleb v\u00f5rrelda t\u00e4iesti erinevaid s\u00fcsteeme (n\u00e4iteks Oracle vs. Redis), siis on ilmne, et korrektse hindamise jaoks on vajalik teha mahutavushinnang (seadmete arvu arvutamine). Mitteeksisteeriva s\u00fcsteemi mahutavushinnang on v\u00e4ga t\u00e4namatu \u00fclesanne, seega p\u00fc\u00fcavad selliseid v\u00f5rdlusi v\u00e4ltida. Seda on lihtne teha: piirangutingimustes m\u00e4rgitakse nullandmete kaotus ja relaatsioonimudel v\u00f5i vastupidi \u2013 koormus 50 000 tehingut sekundis.<\/p>\n<p>Litsentside hindamiseks piisab, kui k\u00fcsida m\u00fc\u00fcjalt v\u00f5i tema partneritelt litsentsi hinda kindla arvu tuumade ja fikseeritud ajaga toetuse kohta. \u00dcldiselt on ettev\u00f5tetel juba tugevad suhted tarkvara m\u00fc\u00fcjatega ning kui andmebaasi halduskeskus ei saa iseseisvalt hinnak\u00fcsimusele vastata, siis piisab selle teabe saamiseks \u00fchest e-kirjast.<\/p>\n<p>Erinevatel m\u00fc\u00fcjatel v\u00f5ivad olla erinevad litsentsimise m\u00f5\u00f5dikud: tuumade arvu, andmemahtu v\u00f5i s\u00f5lmede arvu j\u00e4rgi. Standby-andmebaas v\u00f5ib olla tasuta v\u00f5i litsentseerida nagu p\u00f5hiversioon. Kui ilmnevad erinevused m\u00f5\u00f5dikutes, tuleb mudelistendi \u00fcksikasjalikult kirjeldada ja arvutada litsentside maksumus stendi jaoks.<\/p>\n<p>Oluline punkt korrektseks v\u00f5rdlemiseks on samad toetuse tingimused. N\u00e4iteks, Oracle'i tugi maksab 22% litsentsihinnast aastas, samas kui PostgreSQL toetuse eest ei pea maksma. Kas on korrektne nii v\u00f5rrelda? Ei, sest veal, mida ei saa oma j\u00f5ududega lahendada, on t\u00e4iesti erinevad tagaj\u00e4rjed: esimeses juhus toetuse spetsialistid aitavad selle kiiresti lahendada, samas kui teisel juhul on oht projekti viivituseks v\u00f5i valmis s\u00fcsteemi seiskamiseks m\u00e4\u00e4ramatuks ajaks.<\/p>\n<p>Toetuse arvestamise tingimusi saab v\u00f5rdsustada kolmel viisil:<\/p>\n<ol>\n<li>Kasutada Oracle'it ilma toeta (reaalsuses midagi sellist ei juhtu).<\/li>\n<li>Osta PostgreSQL jaoks tugi - n\u00e4iteks ettev\u00f5ttelt Postgres Professional.<\/li>\n<li>Arvesse v\u00f5tta riske, mis on seotud toe puudumisega.<\/li>\n<\/ol>\n<p>\nN\u00e4iteks v\u00f5ivad riskide arvutused v\u00e4lja n\u00e4ha sellised: kui andmebaasi s\u00fcsteem t\u00f5rgeb, kulub selle taastamiseks 1 t\u00f6\u00f6p\u00e4ev. S\u00fcsteemi kasutamisest plaanitud kasum on 40 miljardit Mongoolia tugrikut aastas, \u00f5nnetuste esinemissagedus on hinnanguliselt 1\/400, seega on hoolduse puudumise risk umbes 100 miljonit Mongoolia tugrikut aastas. On selge, et \"plaanitud kasum\" ja \"hindatud \u00f5nnetuste esinemissagedus\" on virtuaalsed v\u00e4\u00e4rtused, kuid parem on omada sellist mudelit kui mitte mingit.<\/p>\n<p>Tegelikult v\u00f5ib s\u00fcsteem olla liiga oluline ning mainekaotused pikaajalise seismise korral oleksid vastuv\u00f5etamatud, seega on tugi vajalik. Kui aga seiskamine on lubatud, v\u00f5ib m\u00f5nikord toetuse katkestamine olla hea viis kulude kokkuhoiuks.<\/p>\n<p>Oletame, et p\u00e4rast k\u00f5iki arvutusi on platvormi A kasutuskulud 5 aastaks kokku 800 miljonit Mongoolia tugrikit, platvormi B kasutuskulud 650 miljonit tugrikit ja platvormi C kasutuskulud 600 miljonit tugrikit. Platvorm C v\u00f5idab ning teenib t\u00e4ispunkti, samas kui platvormid A ja B saavad veidi v\u00e4hem, proportsionaalselt sellele, kui palju nad kallimad on. Antud juhul \u2013 0.75 ja 0.92 punkti vastavalt.<\/p>\n<h4>V\u00f5imaluste hindamine<\/h4>\n<p>\nV\u00f5imaluste hindamine jaguneb paljudeks gruppideks, mille arv on piiratud ainult selle inimese kujutlusv\u00f5imega, kes hindamist l\u00e4bi viib. Optimaalse lahendusena tundub selle jagamine tiimide kaupa, kes neid v\u00f5imalusi kasutavad; meie n\u00e4ites on see arendajad, administraatorid ja infos\u00fcsteemide ametnikud. Oletame, et nende funktsioonide kaalud jagunevad j\u00e4rgnevalt: 40:40:20.<\/p>\n<p>Arendamise funktsioonide alla kuuluvad:<\/p>\n<ul>\n<li>andmete t\u00f6\u00f6tlemise mugavus;<\/li>\n<li>skaalautuvus;<\/li>\n<li>teisej\u00e4rguliste indeksite olemasolu.<\/li>\n<\/ul>\n<p>\nKriteeriumide nimekiri ja nende kaalud on v\u00e4ga subjektiivsed. Isegi sama \u00fclesande lahendamisel v\u00f5ivad need nimekirjad, punktide kaalud ja vastused m\u00e4rgatavalt erineda s\u00f5ltuvalt teie meeskonna koosseisust. N\u00e4iteks kasutab Facebook andmete salvestamiseks MySQL-i, samas kui Instagram p\u00f5hineb Cassandra-l. On kaheldav, et nende rakenduste arendajad oleksid selliseid tabeleid t\u00e4itnud. Saame vaid oletada, et Mark Zuckerberg valis t\u00e4ieliku relatsioonilise mudeli, makstes selle eest rakenduste sharding\u2019u vajadusega, samas kui Kevin Systrom kavandas skaleerimise platvormi vahenditega, ohverdades andmete ligip\u00e4\u00e4setavuse.<\/p>\n<p>Haldusfunktsioonide hulka kuuluvad:<\/p>\n<ul>\n<li>varundamise s\u00fcsteemi v\u00f5imalused;<\/li>\n<li>j\u00e4lgimise mugavus;<\/li>\n<li>v\u00f5imsuste \u2013 ketaste ja s\u00f5lmede \u2013 haldamise mugavus;<\/li>\n<li>andmete replikatsiooni v\u00f5imalused.<\/li>\n<\/ul>\n<p>\nPange t\u00e4hele, et k\u00fcsimuste s\u00f5nastused peavad v\u00f5imaldama kvantitatiivset hindamist. Saame isegi kokku leppida, kuidas teatud funktsioone hinnata. Proovime n\u00e4iteks hinnata varundamise t\u00f6\u00f6riistu Oracle DB-ga kaasasolevate t\u00f6\u00f6riistade n\u00e4itel:<\/p>\n<p>T\u00f6\u00f6riista<br \/>\nKommentaar<br \/>\nHinne<\/p>\n<p>imp\/exp<br \/>\nAndmete eksport ja import<br \/>\n0.1<\/p>\n<p>varundamise algus\/l\u00f5pp<br \/>\nFailide kopeerimine<br \/>\n0.3<\/p>\n<p>RMAN<br \/>\nInkrementaalse kopeerimise v\u00f5imalus<br \/>\n0.7<\/p>\n<p>ZDLRA<br \/>\nAinult inkrementaalne kopeerimine, kiireim taastamine punktis<br \/>\n1.0<\/p>\n<p>\nKui selged hindamiskriteeriumid puuduvad, on m\u00f5ttekas k\u00fcsida mitmelt ekspertidelt hinnangut ja seej\u00e4rel need keskmistada.<\/p>\n<p>L\u00f5puks loetleme lihtsalt infos\u00fcsteemide turvafunktsioonid:<\/p>\n<ul>\n<li>paroolihalduse poliitikate olemasolu;<\/li>\n<li>v\u00e4list autentimisvahendite (LDAP, Kerberos) \u00fchendamise v\u00f5imalus;<\/li>\n<li>rollip\u00f5hine ligip\u00e4\u00e4sude mudel;<\/li>\n<li>auditiv\u00f5imalused;<\/li>\n<li>andmete kr\u00fcpteerimine kettal;<\/li>\n<li>kr\u00fcpteerimine andmete edastamisel v\u00f5rgus (TLS);<\/li>\n<li>andmete kaitse administraatori eest.<\/li>\n<\/ul>\n<p><\/p>\n<h4>J\u00f5udluse testimine<\/h4>\n<p>\nEraldi sooviksin hoiatada, et \u00e4rge kasutage mitte teie enda tehtud koormustestide tulemusi argumentidena.<\/p>\n<p>Esiteks, katsetatavate rakenduste andmestruktuur ja koormusprofiil v\u00f5ivad oluliselt erineda \u00fclesandest, mille te kavatsete lahendada. 10-15 aastat tagasi meeldis andmebaasitootjatele uhkeldada TPC-testide k\u00e4igus saavutatud tulemustega, kuid n\u00fc\u00fcdseks tundub, et keegi ei v\u00f5ta neid tulemusi enam t\u00f5siselt.<\/p>\n<p>Teiseks, s\u00fcsteemi j\u00f5udlus s\u00f5ltub m\u00e4rkimisv\u00e4\u00e4rselt sellest, millisele platvormile kood algselt kirjutatud on ja millisel riistvaral katsetati. Olen n\u00e4inud mitmeid teste, kus Oracle'it v\u00f5rreldakse PostgreSQL-iga. Tulemused ulatuvad \u00fche s\u00fcsteemi \u00fchem\u00f5ttelisest \u00fclevusest teise s\u00fcsteemi sama \u00fchem\u00f5ttelisest \u00fclevusest.<\/p>\n<p>Ja l\u00f5puks, kolmandaks, te ei tea midagi sellest, kes katse l\u00e4bi viis. Oluline on nii spetsialiseerumine, mis m\u00f5jutab operatsioonis\u00fcsteemi ja platvormi seadistamise kvaliteeti, kui ka motivatsioon, mis m\u00f5jutab katsete tulemusi rohkem kui k\u00f5ik teised tegurid kokku.<\/p>\n<p>Kui j\u00f5udlus on kriitiliselt oluline, tehke test ise, eelistatavalt spetsialistide osalusel, kes seadistavad ja hooldavad t\u00f6\u00f6stuslikku s\u00fcsteemi.<\/p>\n<h4>Tulemus<\/h4>\n<p>\nL\u00f5puks peaks kogu tehtud t\u00f6\u00f6 tulemuseks olema elektrooniline tabel, kus k\u00f5ik hinnangud on kokku toodud, korrutatud ja liidetud:<\/p>\n<p><img decoding=\"async\" alt=\"Mis on parem \u2013 Oracle v\u00f5i Redis v\u00f5i Kuidas p\u00f5hjendada platvormi valikut\" src=\"\/wp-content\/uploads\/2020\/07\/760bfe92d02865ec27ab6ac28d64e855.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNagu te m\u00f5istate, saab kaalude muutmise ja hinnangute kohandamisega saavutada mistahes soovitud tulemuse, kuid see on juba hoopis teine lugu\u2026<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/510176\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u2013\u00a0\u042d\u0442\u043e \u0436 \u043d\u0430\u0434\u043e,\u00a0\u2014 \u043d\u0438 \u043a \u043a\u043e\u043c\u0443 \u043d\u0435 \u043e\u0431\u0440\u0430\u0449\u0430\u044f\u0441\u044c, \u0433\u0440\u043e\u043c\u043a\u043e \u0441\u043a\u0430\u0437\u0430\u043b\u0430 \u043e\u043d\u0430.\u00a0\u2013 \u042d\u0442\u043e \u0436 \u043d\u0430\u0434\u043e! \u0422\u0430\u043a \u043f\u0440\u044f\u043c\u043e \u0438 \u043d\u0430\u043f\u0438\u0441\u0430\u043d\u043e \u2013 \u0433\u043b\u0430\u0432\u043d\u043e\u0439 \u0437\u0430\u0434\u0430\u0447\u0435\u0439 \u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0438\u0437\u0432\u043b\u0435\u0447\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0431\u044b\u043b\u0438 \u0432\u00a0\u0438\u043d\u0442\u0435\u0440\u0435\u0441\u0430\u0445 \u0430\u043a\u0446\u0438\u043e\u043d\u0435\u0440\u043e\u0432. \u041d\u0443 \u0432\u044b \u043f\u043e\u0434\u0443\u043c\u0430\u0439\u0442\u0435! \u041d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u0431\u043e\u044f\u0442\u0441\u044f! \u042e\u043b\u0438\u0439 \u0414\u0443\u0431\u043e\u0432, \u00ab\u041c\u0435\u043d\u044c\u0448\u0435\u0435 \u0437\u043b\u043e\u00bb \u0423\u0432\u0438\u0434\u0435\u0432 \u0442\u0430\u043a\u043e\u0439 \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043e\u043a, \u0432\u044b \u043d\u0430\u0432\u0435\u0440\u043d\u044f\u043a\u0430 \u0443\u0436\u0435 \u0440\u0435\u0448\u0438\u043b\u0438, \u0447\u0442\u043e \u0441\u0442\u0430\u0442\u044c\u044f \u2013 \u0438\u043b\u0438 \u0433\u043b\u0443\u043f\u043e\u0441\u0442\u044c, \u0438\u043b\u0438 \u043f\u0440\u043e\u0432\u043e\u043a\u0430\u0446\u0438\u044f. \u041d\u043e \u043d\u0435 \u0441\u043f\u0435\u0448\u0438\u0442\u0435 \u0441 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":87815,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-87814","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u2013 \u042d\u0442\u043e \u0436 \u043d\u0430\u0434\u043e, \u2014 \u043d\u0438 \u043a \u043a\u043e\u043c\u0443 \u043d\u0435 \u043e\u0431\u0440\u0430\u0449\u0430\u044f\u0441\u044c, \u0433\u0440\u043e\u043c\u043a\u043e \u0441\u043a\u0430\u0437\u0430\u043b\u0430 \u043e\u043d\u0430. \u2013 \u042d\u0442\u043e \u0436 \u043d\u0430\u0434\u043e! 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