{"id":55027,"date":"2020-01-10T00:00:00","date_gmt":"2020-01-09T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/bd-messendzhera-ch-2-sektsioniruem-nazhivuyu"},"modified":"2020-02-18T14:03:06","modified_gmt":"2020-02-18T11:03:06","slug":"bd-messendzhera-ch-2-sektsioniruem-nazhivuyu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/bd-messendzhera-ch-2-sektsioniruem-nazhivuyu","title":{"rendered":"Messengeri andmebaas (osa 2): jaotame \"realses ajas\".","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Me oleme edukalt projekteerinud meie PostgreSQL andmebaasi struktuuri vestluste salvestamiseks, aasta on m\u00f6\u00f6das ja kasutajad t\u00e4idavad seda aktiivselt, n\u00fc\u00fcd on seal juba <b>miljoneid kirjeid<\/b>, ja\u2026 midagi hakkas aeglasemalt minema.<\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/483176\/\">Jagu 1: projekteerime andmebaasi karkassi<\/a><\/noindex><\/li>\n<li>Jagu 2: sektsioneerime \u201ereaalajas\u201d<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Messengeri andmebaas (osa 2): jaotame &quot;realses ajas&quot;.\" src=\"\/wp-content\/uploads\/2020\/01\/7830da046d9c472af15330e42cbb05e0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nAsi on selles, et <b>Kuna tabeli maht suureneb, suureneb ka indeksite \"s\u00fcgavus\"<\/b> \u2014 kuigi logaritmiliselt. Kuid aja jooksul sunnib see serverit t\u00e4itma samu lugemise\/kirjutamise \u00fclesandeid <i>k\u00e4sitlema t\u00e4htselt rohkem andmelehti<\/i>, kui alguses.<\/p>\n<p>Siinkohal tuleb appi <b>partitsioneerimine<\/b>.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nTuleb m\u00e4rkida, et r\u00e4\u00e4gime mitte shardimisest, st andmete jaotamisest erinevate andmebaaside v\u00f5i serverite vahel. Sest isegi kui te jagate andmed <b>m\u00f5ningaid<\/b> serverite vahel, ei p\u00e4\u00e4se te ajapikku esineva \"indeksite paisumise\" probleemist. On selge, et kui saate iga p\u00e4ev uue serveri juurutada, siis teie probleemid ei j\u00e4\u00e4 seotud konkreetse andmebaasi tasandiga.<\/p>\n<p>Me vaatame mitte konkreetseid skripte, et teostada partitsioneerimist \"rauda\", vaid l\u00e4henemist \u2013 mida ja kuidas tuleks \"t\u00fckeldada\" ning mida see soov kaasa toob.<\/p>\n<h2>K\u00e4siteema<\/h2>\n<p>\nKordame meie eesm\u00e4rki: soovime seda, et t\u00e4na, homme ja aasta p\u00e4rast j\u00e4\u00e4ks PostgreSQL loetavate andmete hulk igasuguste lugemise\/kirjutamise operatsioonide k\u00e4igus enam-v\u00e4hem samaks.<\/p>\n<p>K\u00e4esolevate jaoks <b>ajal pooltugevdus andmetele<\/b> (\u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f, \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u044b, \u043b\u043e\u0433\u0438, \u0430\u0440\u0445\u0438\u0432\u044b, &#8230;) \u0435\u0441\u0442\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u043c \u0432\u044b\u0431\u043e\u0440\u043e\u043c \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043a\u043b\u044e\u0447\u0430 \u0441\u0435\u043a\u0446\u0438\u043e\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f <b>s\u00fcndmuse kuup\u00e4ev\/aeg<\/b>. Meie puhul on selliseks s\u00fcndmuseks <u>s\u00f5numi saatmise hetk<\/u>.<\/p>\n<p>M\u00e4rkasime, et kasutajad t\u00f6\u00f6tavad peaaegu alati <b>ainult \"viimastega\"<\/b> selliste andmete \u2013 loevad viimaseid s\u00f5numeid, anal\u00fc\u00fcsivad viimaseid logisid,\u2026 Ei, loomulikult v\u00f5ivad nad kerida ka ajas tagasi, kuid teevad seda v\u00e4ga harva.<\/p>\n<p>Nendest piirangutest on selge, et parim lahendus s\u00f5numite jaoks oleks <b>\"p\u00e4evaste\" sektsioonide loomine<\/b> \u2014 sest peaaegu alati loeb meie kasutaja seda, mis tuli \"t\u00e4na\" v\u00f5i \"eile\".<\/p>\n<p>Kui me p\u00e4eva jooksul kirjutame ja loeme peamiselt vaid \u00fches sektsioonis, siis see annab meile ka <b>efektiivsema m\u00e4lu ja ketta kasutamise<\/b> \u2014 kuna k\u00f5ik sektsiooni indeksid mahuvad h\u00f5lpsasti m\u00e4llu, erinevalt \"suurtest ja paksudest\" kogu tabelis.<\/p>\n<h2>step-by-step<\/h2>\n<p>\n\u00dcldiselt k\u00f5lab k\u00f5ik, mis eespool \u00f6eldud, nagu suur kasum. Ja see on saavutatav, kuid selleks peame korralikult vaeva n\u00e4gema \u2014 sest <u>\u00fcks olendite sektsioneerimise lahendus toob kaasa vajaduse \u00abjagada\u00bb ka need, mis sellega seotud<\/u>.<\/p>\n<h4>S\u00f5num, selle omadused ja projektsioonid<\/h4>\n<p>\nKuna otsustasime s\u00f5numeid kuup\u00e4evade p\u00f5hjal jagada, on m\u00f5istlik jagada ka s\u00f5ltuvad omadused (lisatud failid, adressaatide nimekiri) ja <b>ka s\u00f5numi kuup\u00e4eva p\u00f5hjal<\/b>.<\/p>\n<p>Kuna \u00fcks meie t\u00fc\u00fcpilisi \u00fclesandeid on s\u00f5numite registrite \u00fclevaatamine (lugemata, sissetulevad, k\u00f5ik), on loogiline, et need \u00abkaasata\u00bb s\u00f5numite kuup\u00e4evade p\u00f5hjal sektsioneerimisse.<\/p>\n<p><img decoding=\"async\" alt=\"Messengeri andmebaas (osa 2): jaotame &quot;realses ajas&quot;.\" src=\"\/wp-content\/uploads\/2020\/01\/5ea615ca97a2b865de537777c401038c.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<blockquote><p>Lisame sektsioneerimise v\u00f5tme (s\u00f5numi kuup\u00e4eva) k\u00f5ikidesse tabelitesse: adressaadid, fail, registrid. S\u00f5numisse ise v\u00f5ib seda mitte lisada, vaid kasutada olemasolevat DateTime.<\/p><\/blockquote>\n<p><\/p>\n<h4>Teemad<\/h4>\n<p>\nKuna teema on mitme s\u00f5numi kohta, ei saa seda sama mudeli j\u00e4rgi enam jagada, peame toetuma millelegi muule. Meie puhul sobib ideaalselt <b>esimese s\u00f5numi kuup\u00e4ev vestluses<\/b> \u2014 seega hetke loomine, tegelikult teema.<\/p>\n<p><img decoding=\"async\" alt=\"Messengeri andmebaas (osa 2): jaotame &quot;realses ajas&quot;.\" src=\"\/wp-content\/uploads\/2020\/01\/4f1336a9e229221f1e25ee8d3c08fb5e.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<blockquote><p>Lisame sektsioneerimise v\u00f5tme (teema kuup\u00e4eva) k\u00f5ikidesse tabelitesse: teema, osaleja.<\/p><\/blockquote>\n<p>\nKuid n\u00fc\u00fcd tekib meil kohe kaks probleemi:<\/p>\n<ul>\n<li>milles sektsioonis otsida s\u00f5numeid teema j\u00e4rgi?<\/li>\n<li>milles sektsioonis otsida teemat s\u00f5numist?<\/li>\n<\/ul>\n<p>\nSaame muidugi j\u00e4tkata otsimist k\u00f5igis sektsioonides, kuid see oleks v\u00e4ga kurb ja nulliks k\u00f5ik meie kasud. Seet\u00f5ttu, et teada saada, kus otsida, loome loogilised lingid\/viidatud sektsioonid:<\/p>\n<ul>\n<li>s\u00f5numisse lisame <b>v\u00e4lja teema kuup\u00e4eva<\/b><\/li>\n<li>teemale lisame <b>s\u00f5numite kuup\u00e4evade komplekti<\/b> selle vestluse kohta (v\u00f5ib olla eraldi tabelina v\u00f5i kuup\u00e4evase massiivina)<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Messengeri andmebaas (osa 2): jaotame &quot;realses ajas&quot;.\" src=\"\/wp-content\/uploads\/2020\/01\/f7bfdc96c396ca37f46d876f185bf98e.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKuna eraldi vestlusele s\u00f5numite kuup\u00e4evade nimekiri on v\u00e4ike (peaaegu k\u00f5ik s\u00f5numid langevad 1-2 j\u00e4rgneva p\u00e4eva sisse), pean peatuma just sellisel variandil.<\/p>\n<p>Kokkuv\u00f5ttes on meie andmebaasi struktuur selline, arvestades sektsioneerimist:<\/p>\n<p><b class=\"spoiler_title\">Tabelid: RU, kui kirillitsast pealkirjades\/xmlid\/p\u00f5ldudes k\u00f5rvalehoidmine, siis pole parem vaadata<\/b><\/p>\n<pre><code class=\"sql\">-- osakonnad s\u00f5numi kuup\u00e4eva j\u00e4rgi\nCREATE TABLE \"S\u00f5num_YYYYMMDD\"(\n  \"S\u00f5num\"\n    uuid\n      PRIMARY KEY\n, \"Teema\"\n    uuid\n, \"Kuup\u00e4evTeema\"\n    date\n, \"Autor\"\n    uuid\n, \"Kuup\u00e4evAeg\" -- kasutame kuup\u00e4evana\n    timestamp\n, \"Tekst\"\n    text\n);\n\nCREATE TABLE \"Saaja_YYYYMMDD\"(\n  \"Kuup\u00e4evS\u00f5num\"\n    date\n, \"S\u00f5num\"\n    uuid\n, \"Isik\"\n    uuid\n, PRIMARY KEY(\"S\u00f5num\", \"Isik\")\n);\n\nCREATE TABLE \"Fail_YYYYMMDD\"(\n  \"Kuup\u00e4evS\u00f5num\"\n    date\n, \"Fail\"\n    uuid\n      PRIMARY KEY\n, \"S\u00f5num\"\n    uuid\n, \"BLOB\"\n    uuid\n, \"Nimi\"\n    text\n);\n\nCREATE TABLE \"S\u00f5numiteRegistr_YYYYMMDD\"(\n  \"Kuup\u00e4evS\u00f5num\"\n    date\n, \"Omandaja\"\n    uuid\n, \"RegistriT\u00fc\u00fcp\"\n    smallint\n, \"Kuup\u00e4evAeg\"\n    timestamp\n, \"S\u00f5num\"\n    uuid\n, PRIMARY KEY(\"Omandaja\", \"RegistriT\u00fc\u00fcp\", \"S\u00f5num\")\n);\nCREATE INDEX ON \"S\u00f5numiteRegistr_YYYYMMDD\"(\"Omandaja\", \"RegistriT\u00fc\u00fcp\", \"Kuup\u00e4evAeg\" DESC);\n\n-- osakonnad teema kuup\u00e4eva j\u00e4rgi\nCREATE TABLE \"Teema_YYYYMMDD\"(\n  \"Kuup\u00e4evTeema\"\n    date\n, \"Teema\"\n    uuid\n      PRIMARY KEY\n, \"Dokument\"\n    uuid\n, \"Pealkiri\"\n    text\n);\n\nCREATE TABLE \"TeemaOsaline_YYYYMMDD\"(\n  \"Kuup\u00e4evTeema\"\n    date\n, \"Teema\"\n    uuid\n, \"Isik\"\n    uuid\n, PRIMARY KEY(\"Teema\", \"Isik\")\n);\n\nCREATE TABLE \"TeemaS\u00f5numiteKuup\u00e4evad_YYYYMMDD\"(\n  \"Kuup\u00e4evTeema\"\n    date\n, \"Teema\"\n    uuid\n      PRIMARY KEY\n, \"Kuup\u00e4ev\"\n    date\n);\n<\/code><\/pre>\n<h2>S\u00e4\u00e4stame raha<\/h2>\n<p>\nAga kui me ei kasuta <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/10\/ddl-partitioning\">klassikalist sektsioonide jagamise varianti<\/a><\/noindex> v\u00e4li v\u00e4\u00e4rtuste jaotuse p\u00f5hjal (triggereid ja p\u00e4randamist v\u00f5i PARTITION BY), vaid teeme seda \"k\u00e4tega\" rakenduse tasemel, siis v\u00f5ib m\u00e4rgata, et sektsioneerimisv\u00f5ti on juba talletatud tabeli nimetuses.<\/p>\n<p>Seet\u00f5ttu, kui te olete nii <b>muretsenud salvestatud andmete hulga p\u00e4rast<\/b>, siis neist \"\u00fclearustest\" v\u00e4ljadest v\u00f5ib ka loobuda ja p\u00f6\u00f6rduda otseselt konkreetsete tabelite poole. T\u00f5si, k\u00f5ik valikud mitmest sektsioonist tuleb sel juhul rakenduse tasemele viia.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/483170\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041c\u044b \u0443\u0434\u0430\u0447\u043d\u043e \u0441\u043f\u0440\u043e\u0435\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u043b\u0438 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 \u043d\u0430\u0448\u0435\u0439 PostgreSQL-\u0431\u0430\u0437\u044b \u0434\u043b\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u043f\u0435\u0440\u0435\u043f\u0438\u0441\u043a\u0438, \u043f\u0440\u043e\u0448\u0435\u043b \u0433\u043e\u0434, \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0430\u043a\u0442\u0438\u0432\u043d\u043e \u0435\u0435 \u043d\u0430\u043f\u043e\u043b\u043d\u044f\u044e\u0442, \u0432\u043e\u0442 \u0432 \u043d\u0435\u0439 \u0443\u0436\u0435 \u043c\u0438\u043b\u043b\u0438\u043e\u043d\u044b \u0437\u0430\u043f\u0438\u0441\u0435\u0439, \u0438\u2026 \u0447\u0442\u043e-\u0442\u043e \u0432\u0441\u0435 \u043d\u0430\u0447\u0430\u043b\u043e \u043f\u043e\u0434\u0442\u043e\u0440\u043c\u0430\u0436\u0438\u0432\u0430\u0442\u044c. \u0427\u0430\u0441\u0442\u044c 1: \u043f\u0440\u043e\u0435\u043a\u0442\u0438\u0440\u0443\u0435\u043c \u043a\u0430\u0440\u043a\u0430\u0441 \u0431\u0430\u0437\u044b \u0427\u0430\u0441\u0442\u044c 2: \u0441\u0435\u043a\u0446\u0438\u043e\u043d\u0438\u0440\u0443\u0435\u043c \u00ab\u043d\u0430\u0436\u0438\u0432\u0443\u044e\u00bb \u0414\u0435\u043b\u043e \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u0441 \u0440\u043e\u0441\u0442\u043e\u043c \u043e\u0431\u044a\u0435\u043c\u0430 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0440\u0430\u0441\u0442\u0435\u0442 \u0438 \u00ab\u0433\u043b\u0443\u0431\u0438\u043d\u0430\u00bb \u0438\u043d\u0434\u0435\u043a\u0441\u043e\u0432 \u2014 \u0445\u043e\u0442\u044c \u0438 \u043b\u043e\u0433\u0430\u0440\u0438\u0444\u043c\u0438\u0447\u0435\u0441\u043a\u0438. \u041d\u043e \u0441\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0435\u043c \u044d\u0442\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-55027","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041c\u044b \u0443\u0434\u0430\u0447\u043d\u043e \u0441\u043f\u0440\u043e\u0435\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u043b\u0438 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 \u043d\u0430\u0448\u0435\u0439 PostgreSQL-\u0431\u0430\u0437\u044b \u0434\u043b\u044f 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