{"id":7813,"date":"2021-10-12T14:30:29","date_gmt":"2021-10-12T12:30:29","guid":{"rendered":"https:\/\/www.vita.sk\/?post_type=product&#038;p=7813"},"modified":"2026-10-16T19:41:07","modified_gmt":"2026-10-16T17:41:07","slug":"online-kurz-postgresql-iv-optimalizacia-dopytov","status":"publish","type":"product","link":"https:\/\/www.vita.sk\/en\/online-kurz-postgresql-iv-optimalizacia-dopytov\/","title":{"rendered":"Online kurz PostgreSQL IV. Optimaliz\u00e1cia dopytov"},"content":{"rendered":"<p>Online kurz PostgreSQL IV. Optimaliz\u00e1cia dopytov je pre v\u00e1s ide\u00e1lny, ak u\u017e pracujete s PostgreSQL a chcete odha\u013eova\u0165 pr\u00ed\u010diny pomal\u00fdch dopytov, navrhova\u0165 vhodn\u00e9 indexy a lep\u0161ie porozumie\u0165 v\u00fdkonu datab\u00e1zy. Ide o certifikovan\u00fd online kurz na PostgreSQL. Spolo\u010dne si vysvetl\u00edme, ako s\u00favisia d\u00e1tov\u00e9 typy, \u0161trukt\u00fara tabuliek a sp\u00f4sob z\u00edskavania \u00fadajov s n\u00e1ro\u010dnos\u0165ou datab\u00e1zov\u00fdch oper\u00e1ci\u00ed. Optimaliz\u00e1cia dopytov v PostgreSQL n\u00e1m pom\u00f4\u017ee systematicky posudzova\u0165 probl\u00e9my, ktor\u00e9 sa prejavuj\u00fa pri vyh\u013ead\u00e1van\u00ed, sp\u00e1jan\u00ed tabuliek alebo spracovan\u00ed v\u00e4\u010d\u0161ieho mno\u017estva \u00fadajov. Zameriame sa na normaliz\u00e1ciu, oper\u00e1cie JOIN, indexovanie aj pr\u00e1cu s textov\u00fdmi a JSON \u00fadajmi. Uk\u00e1\u017eeme si, pre\u010do pri \u00faprav\u00e1ch potrebujeme v\u017edy posudzova\u0165 konkr\u00e9tny dopyt, pou\u017e\u00edvan\u00e9 d\u00e1ta a podmienky jeho vykon\u00e1vania.<\/p>\n<p>&nbsp;<\/p>\n<p>\u0164a\u017eiskom kurzu je \u010d\u00edtanie exeku\u010dn\u00fdch pl\u00e1nov pomocou pr\u00edkazu EXPLAIN a pochopenie rozhodovania pl\u00e1nova\u010da dopytov. Rozl\u00ed\u0161ime sekven\u010dn\u00e9 preh\u013ead\u00e1vanie tabu\u013eky, Index Scan, Bitmap Index Scan a Bitmap Heap Scan. Vysvetl\u00edme si v\u00fdznam odhadovan\u00fdch n\u00e1kladov a \u0161tatist\u00edk pri v\u00fdbere sp\u00f4sobu vykonania dopytu. N\u00e1sledne prejdeme na konfigur\u00e1ciu PostgreSQL, mechanizmus TOAST, \u00fadr\u017ebu pomocou VACUUM a pr\u00e1cu s vyrovn\u00e1vacou pam\u00e4\u0165ou. Pozrieme sa tie\u017e na bin\u00e1rne \u00fadaje, datab\u00e1zov\u00e9 rel\u00e1cie a nastavenia zaznamen\u00e1vania udalost\u00ed do logov. Pri diagnostike vyu\u017eijeme pgAdmin a predstav\u00edme si anal\u00fdzu logov pomocou pgBadger. Obozn\u00e1mime sa aj s n\u00e1strojom EverSQL a jeho vyu\u017eit\u00edm pri h\u013eadan\u00ed mo\u017enost\u00ed optimaliz\u00e1cie.<\/p>\n<p>&nbsp;<\/p>\n<p>Optimaliz\u00e1cia dopytov v PostgreSQL n\u00e1jde uplatnenie pri v\u00fdvoji aplik\u00e1ci\u00ed, datab\u00e1zovej administr\u00e1cii aj pr\u00edprave analytick\u00fdch v\u00fdstupov. Pri precvi\u010dovan\u00ed odpor\u00fa\u010dame porovn\u00e1va\u0165 p\u00f4vodn\u00fd a upraven\u00fd dopyt na rovnak\u00fdch \u00fadajoch a kontrolova\u0165 spr\u00e1vnos\u0165 v\u00fdsledkov. Takto si vytvor\u00edme pracovn\u00fd postup, ktor\u00fd prep\u00e1ja diagnostiku, n\u00e1vrh \u00fapravy a overenie jej pr\u00ednosu. \u0160tudujete online, v sloven\u010dine a vlastn\u00fdm tempom. Z\u00edskate ro\u010dn\u00fd pr\u00edstup, materi\u00e1ly na stiahnutie, prezent\u00e1ciu a \u0165ah\u00e1ky, ku ktor\u00fdm sa m\u00f4\u017eete vraca\u0165 pri samostatnej pr\u00e1ci. Vedomosti si over\u00edme v priebe\u017enom a z\u00e1vere\u010dnom teste a po \u00faspe\u0161nom absolvovan\u00ed z\u00edskate certifik\u00e1t VITA. Ak sa chcete skuto\u010dne nau\u010di\u0165 optimalizova\u0165 dopyty v PostgreSQL a analyzova\u0165 v\u00fdkon datab\u00e1zy, tak toto je ide\u00e1lny online kurz pre v\u00e1s.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Online kurz PostgreSQL IV. Optimaliz\u00e1cia dopytov v\u00e1s nau\u010d\u00ed optimalizova\u0165 SQL dopyty, pou\u017e\u00edva\u0165 indexy, EXPLAIN, Query Planner, VACUUM a pgBadger a analyzova\u0165, monitorova\u0165 a zvy\u0161ova\u0165 v\u00fdkon PostgreSQL datab\u00e1z.","protected":false},"author":27,"featured_media":4220,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[54,49,73],"product_tag":[1288,1703,1892,1893,1894,1895,1896,188,207,347,1287],"class_list":{"0":"post-7813","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-online-kurzy-postgresql","7":"product_cat-online-kurzy-databazy-statistika-analytika","8":"product_cat-bez-kategorie","9":"product_tag-databazova-administracia","10":"product_tag-pgadmin","11":"product_tag-vykon-databaz","12":"product_tag-exekucne-plany","13":"product_tag-explain","14":"product_tag-databazove-indexy","15":"product_tag-pgbadger","16":"product_tag-databazy-a-analytika","17":"product_tag-postgresql","18":"product_tag-sql","19":"product_tag-optimalizacia-dopytov","21":"first","22":"instock","23":"sale","24":"virtual","25":"sold-individually","26":"taxable","27":"purchasable","28":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v25.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Online kurz PostgreSQL IV. 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